Trane Ventilation Hood Tracer Unit Ventilator User Manual

Installation

Ow ner

Diagnostics

Tra c e r^®ZN.5 2 0 fo r Cla s s ro o m

Un it Ve n t ila t o r

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S t a rt -u p P ro c e d u re s

Power Up Sequence

Manual output test can be initiated

at any tim e in the power up se-

quence or during norm al opera-

tion.

When 24 VAC power is initially ap-

plied to the controller, the follow-

ing sequence occurs:

1. Green Status LED turns on.

2. All outputs are controlled Off.

3. The controller reads input val-

ues to determ ine initial values.

4. Standalone control is assum ed

unless occupancy data is com -

m unicated.

5. Random start tim er expires (5

to 30 seconds, random ).

6. Power-up control Wait feature

is applied. When power up

control Wait is enabled, the

controller waits 120 seconds to

allow am ple tim e for com m u-

nicated control data to arrive.

If, after 120 seconds, the con-

troller does not receive a com -

m unicated occupancy request,

the unit assum es standalone

operation.

7. All m odulating valves and

dam per calibrate closed, face

and bypass dam per calibrate

to bypass (when present).

8. Norm al operation begins after

290 (potentially) seconds have

passed.

No t e : Ma n u a l o u t p u t t e s t c a n

b e in it ia t e d a t a n y t im e .

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Ge n e ra l In fo rm a t io n

Tra c e r ZN.5 2 0

Ove rvie w

The Trane Tracer ZN.520 con-

troller is a factory-installed and

com m issioned, direct-digital

controller (DDC) offering for

classroom unit ventilator sys-

tem s. (See Figure 1: “Tracer

ZN.520 Control Board ” ) The Trac-

er ZN.520 can also be applied to

other Trane interoperable HVAC

equipm ent, including the fan coil

and blower coil products. (For

m ore inform ation see,Table 1:

Tracer™ ZN.520 Unit Controller

features and coil availability, on

page 8 for m ore inform ation.) For

m ore inform ation regarding the

application of the Tracer ZN.520

to other Trane products, contact

the appropriate local Trane sales

office.

Trane offers a com plete solution

to space com fort control with the

flexibility of Integrated Com fort

System (ICS) and stand-alone

control packages. The ICS control

package com bines HVAC equip-

m ent and building m anagem ent

into one environm ental com fort

system .

Integrating the Tracer ZN.520 on

classroom unit ventilators, and

tying them to a Tracer Sum m it

system will provide a com plete

building m anagem ent system .

The stand-alone control package

offers the features and function-

ality of the direct digital control

without a front-end building au-

tom ation system , while providing

future considerations for ICS.

Figure 1: Tracer ZN.520 Control Board

The Tracer ZN.520 is factory-

m ounted, tested, wired, config-

ured and com m issioned for the se-

lected application.

Equipm ent problem s can often be

diagnosed on each unit without

having to access the unit com po-

nets. These diagnostics can be re-

ceived rem otely via a m odem with

a Tracer Sum m it building autom a-

tion system , thus reducing the

num ber of actual on-site service

The Tracer ZN.520 configuration

has flexible point and product con-

figurations. For exam ple, with

point configuration, a specific bi-

nary point can be configured to ac-

cept input from either a tim e clock

or som e type of generic device.

calls; through the Rover service

tool connected to a com m unica-

tion jack located inside the Trace

zone sensor; or connected to the

unit.

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Ge n e ra l In fo rm a t io n

Ta b le 1 : Tr a c e r ™ ZN .5 2 0 U n it C o n t r o lle r f e a t u r e s a n d c o il a v a ila b ilit y

En t e rin g

Wa t e r

A u t o

Da m p e r

A d ju s t

Fa c e a n d

By p a s s

Da m p e r

Mu lt ip le

D e h u m id -

ific a t io n

Va lv e

Ec o n o m ize r

D a m p e r

Au xilia ry

He a t ²

Co il

Fa n S p e e d s

C o n t r o l

Te m p e ra t u re

S a m p lin g

2-pipe changeover

2-pipe hot wa te r

only

2-pipe steam only

2-pipe changeover/

electric heat

2-pipe cool only

2-pipe cool only/

electric heat

4-p ip e h o t w a te r/

chilled water

4-pipe changeover

4-pipe steam /chilled

w a te r

Electric heat only

DX/hot water

DX/steam

X¹

DX/electric heat

DX cooling only

1 . Multiple fan speeds are available in hydronic units only.

2 . Auxiliary heat is designed to bring on baseboard heat as the second stage of heating. The baseboard heat m ust be the sam e type as the

unit heating coil.

3 . Units with face bypass dam pers cannot actively dehum idify.

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Co n t ro lle r Circ u it Bo a rd

Fe a t u re s

Power

Generic

Auto Test Button

Status LED

Com m unications LED

Service Button and LED

Com m unications

Zone Sensor Connections

Figure 2: Tracer ZN.520 unit controller circuit board

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Co n t ro lle r Fe a t u re s

Each Tracer ZN.520 unit controller

circuit board is equipped with en-

hancem ents to help facilitate ser-

vice, testing, and diagnosis.

The zone sensor m ay also be used

S e rvic e

when trying to locate a unit. By

pressing the O N button on the zone

sensor for 5 seconds or using the

“wink” com m and in Rover, the cir-

cuit board receives the signal caus-

The Trane Tracer ZN.520 unit con-

troller is serviced using Rover , the

ICS software service too. Rover is

designed to support the Tracer

Each board has

q Manual test button,

q Status LED,

ZN.520 unit controller on the class- ing the Com m unication LED to

room unit ventilator.

“wink”. Winking allows visual

identifier on the board for service

technicians.

For “rem ote” access to the com -

m unicating units, the zone sensors

offered with the Tracer ZN.520

q Com m unication status LED,

q Service button,

The Tracer ZN.520 also includes

q Quick term inal connectors, and

have a telephone style (RJ -11) con- features such as a test output to

nector allowing field connection

between Rover and the zone sen-

sor; however, the RJ -11 connector

m ust be connected to the term inals

TB2-5 and TB2-6 on the Tracer

ZN.520 unit controller.(See Figure

3: “Rover service tool connected to

the RJ -11 com m unication jack in a

zone sensor”)

m anually test all of the end devices

and color coded wires (i.e. red for

heating valves and blue for cooling

valves) to aid in the troubleshoot-

ing process.(See “Manual Output

Test” on page 48, for m ore infor-

m ation.)

q Easy to read screen printing.

(See Figure 1: “Tracer ZN.520

Control Board”).

Figure 3: Rover service tool connected to the RJ -11 com m unication jack in a zone sensor

Power is supplied by a

q Standard End Devices—a

variety of devices that help to

gather inform ation, control

capacity, and provide

Typ ic a l Co m p o n e n t s

separately m ounted 24 VAC\90

A typical classroom unit ventilator

system with a DDC package con-

sists of the following physical com -

ponents, in addition to the

VA transform er.

q Sensor Modules—a variety of

analog sensors that provide

tem perature and optional

hum idity sensing and CO₂

ventilation are used by the

Tracer ZN.520 in its control

algorithm to condition the

space to the desired

tem perature and relative

hum idity level. (See “Standard

End Devices” o n p a g e 13, fo r

m ore inform ation.)

m echanical equipm ent:

q Tracer ZN.520—contains the

sensor input circuits, service

adjustm ents, m icroprocessor

control electronics, and

sensor; and an operator

interface to the Tracer ZN.520

for operating m odes, status,

and tem perature setpoints.

com m unications hardware.

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Co m m u n ic a t io n Co n fig u ra t io n s

No t e : Th e Tra c e r ZN.5 2 0 is a

c o n fig u re d c o n t ro lle r. It w ill

n o t o p e ra t e w it h o u t a va lid

d o w n lo a d e d c o n fig u ra t io n

file .

connect to a m axim um of 120

Tracer ZN.520 controllers.

The ICS system also allows all of

the classroom unit ventilators to

share inform ation without the

presence of hardwired sensors at

each unit. Som e typical shared

points include outside air tem per-

ature, entering water tem perature,

and occupancy schedules.

The Tracer ZN.520 controller sup-

ports ICS and peer-to-peer com -

m unications as well as stand-

alone operation. A num ber of con-

trol features m ay be configured at

the factory or by using the Rover

service tool. (See “Configuration”

on page32, for m ore inform ation.)

P e e r-t o -P e e r

Co m m u n ic a t io n s

On a peer-to-peer com m unication

system , m ultiple Tracer ZN.520

controllers m ay share data, via a

twisted pair com m unication wire,

without the need for a Tracer Sum -

m it system . (See Figure 5: “ Peer-

to-peer com m unication connec-

tions” )

In t e g ra t e d Co m fo rt

S ys t e m

Figure 4: Com m unications link wire

No t e : Th e Tra c e r ZN.5 2 0

c o n t ro lle r m a y o n ly b e u s e d

w it h Tra c e r S u m m it ve rs io n

1 1 .0 o r g re a t e r w it h a Co m m 5

c o m m u n ic a t io n s c a rd .

The ICS system allows for com -

plete com m unication with the

classroom unit ventilators via

Tracer ZN.520 unit controller. All

points connected to the Tracer

ZN.520 m ay be observed from the

Tracer Sum m it front-end control-

ler. The Tracer Sum m it can also

initiate an alarm on a loss of per-

form ance or equipm ent m alfunc-

tions.

Peer-to-peer com m unications al-

lows features such as m aster/slave

operation, in which m ultiple units

operate off of a single zone sensor.

This is typically seen in large spac-

es requiring m ultiple units.

Classroom unit ventilators can op-

erate as part of a large building au-

tom ation system controlled by

Tracer Sum m it. The Tracer ZN.520

is linked directly to the Tracer

Sum m it via a twisted pair com m u-

nication wire. Each Tracer Sum m it

building autom ation system can

The Rover service tool is required

to set up peer-to-peer com m unica-

tions.

Figure 5: Peer-to-peer com m unication connections

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Co m m u n ic a t io n Co n fig u ra t io n s

A personal com puter running Rov-

er m ay be directly connected to a

standalone Tracer ZN.520; con-

nected to the com m unications jack

in the Trane zone sensor; or con-

nected to a com m unicating unit’s

Tracer ZN.520 unit controller, to ac-

cess all of the units on a com m uni-

cating link.

S t a n d -Alo n e

Co m m u n ic a t io n In t e rfa c e

In a stand-alone configuration,

com m ands for operation are deter-

m ined based on input from the

zone sensor, hum idity sensor, and

factory- or field-m ounted tim e-

clock.(See Figure 6: “ Typical class-

room unit ventilator installation”)

Im p o rt a n t ! To h e lp e n s u re

o p t im a l p e rfo rm a n c e o f t h e

Ro ve r s e rvic e t o o l, p le a s e u s e

t h e la t e s t ve rs io n . To o b t a in

t h e la t e s t ve rs io n c o n t a c t yo u r

lo c a l Tra n e s a le s re p re s e n t -

t a t ive o r s e rvic e t e c h n ic ia n .

q The tim eclock is wired to the

Tracer ZN.520 to index the unit

between occupied and

No t e : Re fe r t o t h e Tra c e r

s ys t e m m a n u a ls fo r m o re

in fo rm a t io n o n c o m m u n ic a -

t io n s .

Rover allows the user to interface

with the Tracer ZN.520, but will not

allow any advanced control (e.g.

equipm ent scheduling or trend-

ing). To purchase a copy of the ICS

software service tool, contact the

BAS departm ent at your local

Trane dealer.

unoccupied m odes.

q A unit-m ounted, analog,

outside-air tem perature sensor

is used to initiate the dry bulb

econom izer and freeze

The Tracer ZN.520 com m unicates

via Com m 5 (LonTalk) to a building

m anagem ent system , the Rover

service tool, and other unit control-

lers on the com m unications link.

Each Tracer ZN.520 requires a

unique address for the system to

operate properly. Every Tracer

ZN.520 has this address (Neuron

ID) em bedded in the m icroproces-

sor, which elim inates the need for

field-addressing of the units. Each

unit also ships from the factory

with a unit identification tag. (See

“Location Identifier” on page38,

for m ore inform ation.)

avoidance routines.

In t e ro p e ra b ilit y

q On changeover units, a unit-

m ounted, analog, entering

water tem perature sensor is

used to autom atically control

the system in the heat/cool

m ode.

Trane has lead the industry with

BACnet interoperability and Trane

is now expanding the realm of in-

teroperable solutions by offering

LonMark certified unit controllers.

The Tracer ZN.520 controller con-

form s to the LonMark Space Com -

fort Controller profile. (See

These sensors are required for

proper system operation and are

provided as standard on stand-

alone units.

“ Appendix—Data Lists” on

page64, for m ore inform ation.)

This allows the ZN.520 to be used

Bu ild in g a u t o m a t io n s ys t e m

Trane offers a state-of the art front- as a unit controller on other control

end building autom ation system

designed to coordinate and m oni-

tor Trane equipm ent and control-

lers: Tracer Sum m it.

system s that support LonTalk and

the SCC profile. Now building own-

ers have m ore choices and design

engineers have m ore flexibility to

m eet the challenges of building au-

tom ation.

The Tracer Sum m it system allows

the user to m onitor and/or change

Tracer ZN.520:

q status, param eters, sensor data,

diagnostics, and internal

variables; and

q setpoints, operating m odes,

and outputs.

Figure 6: Typical classroom unit ventilator

installation

S e rvic e t o o l

Trane also offers a service tool to

work in conjunction with the Tracer

Sum m it system or with peer-to-

peer and stand-alone system s: the

Rover service tool.

Com m unication to the Tracer

ZN.520, or m ultiple controllers, can

also be accom plished by using the

ICS software service tool.

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S t a n d a rd En d De vic e s

Ta b le 2 : En d D e v ic e S p e c if ic a t io n s

De vic e

C h a r a c t e r is t ic

D e s c r ip t io n

Fan Status Switch

Ma te ria l

Contact Blade—Pilot duty rated

-40°F/250°F (-40°C/120°C)

SPST-NO

Ope ra ting Te m pe ra ture Ra nge

Co n ta ct Fo rm

Pre s e t

Fan status - 0.07”

Low Tem perature Detection Switch (Freezestat)

3 6 °F ± 2 °F

(2°C + - 1.11°C)

Trip Tem perature:

4 4 °F ± 3 °F

(6.67°C + - 1.67°C)

Release Tem perature

Pilot Duty

(24 VAC)

120 VAC

10.0

240 VAC

FLA

5.0

Ra tin g —Au to Re s e t

LRA

60.0

30.0

Ou ts id e Air S e n s o r/d is ch a rg e AirS e n s o r/En te rin g

Wa te r Te m pe ra ture Se nsor/Unit Mounte d, Zone

Return-air Tem perature Sensor

Th e rm is to r 10 KOh m s @ 77°F ± 1.8°F (25°C

±1°C)

S e n s in g Ele m e n t

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S t a n d a rd En d De vic e s

Ta b le 2 : En d De vic e S p e c ific a t io n s

De vic e

C h a r a c t e r is t ic

Description

D e s c r ip t io n

Outside Air Actuator

Three-point floating with spring return

Am bient Tem perature Rating

Power Consum ption

Torque

-25°F to 125°F

5 VA

35 in-lbs.

Drive Tim e

90 seconds, 95 degree stroke

Fa ce a nd Bypa ss Actua tor

Description

Three-point floating

3 2 °F t o 1 2 2 °F

3 VA

Am bient Tem perature Rating

Power Consum ption

Torque

35 in-lbs.

Drive Tim e

80-110 seconds, 95 degree stroke

2-wa y Control Va lve

Description

Three-point m odulating

140°F a t 95% re la tive h u m id ity

50 s e co n d s

Am bient Tem perature Rating

Drive Tim e

Ma x Pre s s u re

Close Off

400 psi water

Va rie d b y s ize a n d Cv

Tem perature

Wa te r 200°F m a xim u m

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S t a n d a rd En d De vic e s

Ta b le 2 : En d D e v ic e S p e c if ic a t io n s

De vic e

C h a r a c t e r is t ic

D e s c r ip t io n

3-wa y Control Va lve

Description

Three-point m odulating

Am bient Tem perature Rating

Drive Tim e

140°F a t 95% re la tive h u m id ity

50 s e co n d s

Ma x Pre s s u re

Clo s e Off

400 psi water

Varied by size and Cv

Tem perature

Wa te r 200°F m a xim u m

Tim e clock

Size

2.83'' x 4.0'' x 2.06''

Po w e r Co n s u m p tio n

Switch

4.4 VA

SPDT dry contacts, silver cadm ium oxide

16A 250V resistive, 1000 Watts tungsten

100m A,230V

Switch Rating

Min im u m S w itch in g Cu rre n t

Shortest Switching Tim e

Am bient Tem perature Range

Wiring Connections

1 m inute

-14°F to 131°F

Screw term inals suitable for #10 to #24 AWG

Backup

Seven day capacitor backup

Zone sensor

Zone Sensor Wiring Size And

Maxim um Lengths

16-22 AWG: up to 200 feet

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S t a n d a rd En d De vic e s

Ta b le 2 : En d De vic e S p e c ific a t io n s

De vic e

C h a r a c t e r is t ic

S e n s in g Ele m e n t

D e s c r ip t io n

Hu m id ity S e n s o r

Polym er capacitive

Accu ra cy: ± 5% o ve r 20-95% RH @ 77ºF

0 to 99% RH

S e n s in g Ele m e n t

Ra n g e

Operating Tem perature Range

Max Supply Voltage

Output Characteristics

0°F to 140ºF

24VDC

4 to 20 MA for 0-100% RH

Drift Rate

Less than 1% per year

CO ₂S e n s o r

S e n s in g Ele m e n t

Ra n g e

Accuracy: ± 100ppm full scale

0-2000 ppm

Operating Tem perature Range

Supply Voltage

59°F to 95ºF

24VAC

Output Characteristics

Po w e r co n s u m p tio n

0-10 VDC for 0-2000 ppm

1 0 VA

Drift Rate

±5% full scale over four years

Fan Relay

20 am ps at 120/240 vac

3/4 hp at 120 vac

1 1/2 hp at 240 vac

20 a m p s @ 28 vd c

DPDT

Contact Rating

Term inals

0.25 quick connect

Contact m aterial

Silver-Cadium Oxide

Coil

24 vac 2.7 va

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S t a n d a rd En d De vic e s

Ta b le 2 : En d D e v ic e S p e c if ic a t io n s

De vic e

C h a r a c t e r is t ic

D e s c r ip t io n

Typ e

N.E.C. Class 2

120 vac

Prim ary Voltage

Control Transform er

24 vac at 90 va

Manual reset

Secondary voltage

4am p fuse in 24-volt circuit

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In s t a lla t io n a n d Wirin g

S p e c ific a t io n s

Dim e n s io n s

Tracer ZN.520 board and m ounting

hardware:

•

Height: 5.25 inches (133 m m .)

Width: 5.50 inches (140 m m )

Depth: 2.25 inches (57 m m )

P o w e r Re q u ire m e n t s

•

18 to 32 VAC (24 VAC nom inal)

50 or 60 Hz

570 m A AC

Op e ra t in g En viro n m e n t

•

32° to 140°F (0× to 60°C)

5% to 95% relative hum idity,

non-condensing

S t o ra g e En viro n m e n t

•

-40° to 185°F (-40° to 85°C)

5% to 95% relative hum idity,

non-condensing

Ag e n c y Lis t in g s

•

UL and CUL 916 Energy Man-

agem ent System

•

Agency Com pliance IEC 1000-

4-2 (ESD), IEC 1000-4-4(EFT),

IEC 1000-4-5 (Surge)

Figure 7: Tracer ZN.520 circuit board

schem atic

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In s t a lla t io n a n d Wirin g

Bin a ry In p u t s

Each binary input associates an in-

put signal of 0 VAC with open con-

tacts and 24 VAC with closed

contacts.

Ta b le 3 : Bin a r y in p u t s (t y p ic a lly 2 4 m A A C )

De s c rip t io n

Te r m in a ls

Te rm in a l Fu n c t io n

Binary input 1

(BI 1)

J 2-1

J 2-2

J 2-3

J 2-4

J 2-5

J 2-6

J 2-7

J 2-8

24 VAC

In p u t

Binary input 2

(BI 2)

24 VAC

In p u t

Binary input 3

(BI 3)

24 VAC

In p u t

Binary input 4

(BI 4)

24 VAC

In p u t

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In s t a lla t io n a n d Wirin g

Bin a ry Ou t p u t s

Outputs are load side switching tri-

acs. The triac acts as a switch, ei-

ther m aking or breaking the circuit

between the load (valve, dam per,

contactor, relay) and ground.

Ta b le 4 : Bin a ry o u t p u t s

O u t p u t

Ra t in g

D e s c r ip t io n

Te rm in a ls

Lo a d En e r g iz e d

1 VAC RMS

Lo a d De -e n e rg ize d

24 VAC RMS

(typical)

Fa n h ig h

J 1-1

12 VA

(typical)

Fa n m e d iu m ,

Exh a u s t fa n

1 VAC RMS

(typical)

24 VAC RMS

(typical)

J 1-2

12 VA

1 VAC RMS

(typical)

24 VAC RMS

(typical)

Fan low

J 1-3

12 VA

—

No connection

J 1-4 (Ke y)

J 1-5

—

Cool open, face bypass cool valve

DX, 2-position cooling valve, BI 5

1 VAC RMS

(typical)

24 VAC RMS

(typical)

12 VA

1 VAC RMS

(typical)

24 VAC RMS

(typical)

Cool close

J 1-6

J 1-7

J 1-8

12 VA

1 VAC RMS

(typical)

24 VAC RMS

(typical)

Fa ce /b yp a s s d a m p e r o p e n

Face/bypass dam per close

1 VAC RMS

(typical)

24 VAC RMS

(typical)

He a t o p e n

Face bypass isolation valve,

2-position heating valve

Electric heat 1 stage

1 VAC RMS

(typical)

24 VAC RMS

(typical)

J 1-9

12 VA

Heat close

Electric heat 2 s ta g e

1 VAC RMS

(typical)

24 VAC RMS

(typical)

J 1-10

J 1-11

J 1-12

12 VA

1 VAC RMS

(typical)

24 VAC RMS

(typical)

Eco n o m ize r d a m p e r o p e n

Eco n o m ize r d a m p e r clo s e

1 VAC RMS

(typical)

24 VAC RMS

(typical)

Ge n e ric /b a s e b o a rd He a t Bin a ry Ou t p u t

Ta b le 5 : Ge n e ric b in a ry o u t p u t s

D e s c r ip t io n

Te r m in a ls

TB4-1

O u t p u t

Ra t in g

Lo a d En e r g iz e d

Lo a d D e -e n e r g iz e d

Generic/ baseboard heat output

24VAC

12 VA

1 VAC RMS

(typical)

24 VAC RMS

(typical)

TB4-2

12 VA

N A

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In s t a lla t io n a n d Wirin g

An a lo g In p u t s

Ta b le 6 : A n a lo g in p u t s

D e s c r ip t io n

Te rm in a ls

Fu n c t io n

Ra n g e

Zo n e

TB3-1

Space tem perature input

5° to 122°F

(-15° to 50°C)

Ground

Set

TB3-2

TB3-3

Ana log ground

Setpoint input

40 ° to 115 °F

(4.4° to 46.1°C)

Fa n

TB3-4

Fan switch input

4821 to 4919 W (Off)

2297 to 2342 W (Au to )

10593 to 10807 W (Lo w )

13177 to 13443 W (Me d iu m )

15137 to 16463 W (High)

Ground

TB3-6

J 3-1

J 3-2

J 3-3

J 3-4

J 3-5

Ana log ground

An a lo g In p u t 1

Entering water tem perature

Ana log ground

-40° to 212°F (-40° to 100°C)

An a lo g In p u t 2

An a lo g In p u t 3

Discharge air tem perature

Ana log ground

-40° to 212°F (-40° to 100°C)

Outdoor air tem perature / Generic

tem perature

-40° to 212°F (-40° to 100°C)

J 3-6

J 3-7

J 3-8

Ana log ground

Po w e r p o rt

An a lo g In p u t 4

4-20 m A

Un ive rs a l in p u t

Generic 4-20m a

Hum idity

0 – 100%

CO2

0 – 2000p p m

J 3-9

Ana log ground

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In s t a lla t io n a n d Wirin g

Mo u n t in g

The Tracer ZN.520 circuit board is

m ounted in the left-hand end pock-

et for all classroom unit ventilator

configurations. The sheet m etal

m ounting plate has raised em boss-

es to accept the m ounting feet on

the circuit board. (See Figure 8:

“Classroom unit ventilator control

box with close-up of horseshoe

em bosses and circuit board

m ounting feet.” ) This design al-

lows the Tracer ZN.520 controller

to be secured with a m inim al num -

ber of sheet m etal screws.

Figure 8: Classroom unit ventilator control box with close-up of horseshoe em bosses and circuit board m ounting feet.

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In s t a lla t io n a n d Wirin g

The m ounting position on the ve r-

t ic a l c la s s ro o m u n it ve n t ila t o r

configuration allows com plete ac-

cess to the Tracer ZN.520 by re-

m oving the front panel. (See

The m ounting plate on the h o ri-

zo n t a l c la s s ro o m u n it ve n t ila -

t o r configuration is designed to

slide out with the rem oval of a sin-

gle screw for com plete access to

the Tracer ZN.520. (See Figure 10:

“ Horizontal classroom unit venti-

lator end pocket” ) The location of

the control board on this unit con-

figuration allows com plete access

to the other com ponents in the

end pocket when the front panel is

rem oved.

For additional convenience, quick

connects and m odular wire har-

nesses are used on the control

board and m ounting plate. (See

Figure 11: “Quick connects to con-

trol board in the classroom unit

ventilator”) These quick connects

help facilitate ease of wiring devic-

es (e.g., zone sensor) to the control

board, and helps add accessibility

to m ajor com ponents.

Figure 9: “ Vertical classroom unit

ventilator end pocket” ) The

m ounting plate swings out of the

way with the rem oval of a single

screw to allow access to the com -

ponents behind the control board.

Figure 11: Quick connects to control board

in the cla ssroom unit ve ntila tor

Figure 9: Vertical classroom unit ventilator

end pocket

Figure 10: Horizontal classroom unit

ventilator end pocket

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In s t a lla t io n a n d Wirin g

q All sensor and input circuits are

Wirin g

mation. All controls are wired

at the factory. Single point

power, zone sensor, and

communication wiring is to

be installed by the contractor.

at or near ground potential. Do

not connect any sensor or input

circuit to an external ground

connection.

WARNING

q A close-coupled ground

connection is required for the

Tracer ZN.520. T

Warning! Disconnect all elec-

trical power before servicing

unit to prevent injury or

death due to electrical shock.

Use copper conductors only.

The use of aluminum or

other incorrect types of wire

may result in overheating

and equipment damage.

Im p o rt a n t ! All w irin g m u s t

c o m p ly w it h s t a t e , lo c a l, a n d

fe d e ra l g u id e lin e s . Co n t a c t t h e

a p p ro p ria t e lo c a l a g e n c y fo r

fu rt h u r in fo rm a t io n .

q Table 7: Tracer ZN.520 Wiring

Requirem ents, shows Tracer

ZN.520 wire types and lengths.

Ta b le 7 : Tra c e r ZN.5 2 0 Wirin g

Re q u ire m e n t s

Im p o rt a n t ! Wire s fo r

t e m p e ra t u re s e n s o rs ,

c o m m u n ic a t io n lin e s , 2 4 VAC,

a n d c o n t a c t c lo s u re s e n s in g

in p u t s s h o u ld n o t b e b u n d le d

w it h o r ru n n e a r h ig h vo lt a g e

w irin g .

A p p lic a t io n

Wir e Ty p e

Le n g t h

Up to

1000 ft.

Contact Closure 18 AWG

Up to

1000 ft.

24 VAC

16-22 AWG

q Power wiring m ust be

separated from the Tracer

ZN.520 and all low voltage

wires. External input wires

should be run in separate

conduits from high voltage

wires.

Up to

1000 ft.

Therm ostat

16-22 AWG

Zone

Sensor

Up to

200 ft.

Belden 8760 Up to

or equivalent 5000 ft.

Com m unications

q Wires connected to pin headers

should be form ed and routed

so as to cause m inim um strain

on the Tracer ZN.520

P o w e r

CAUTION

The Tracer ZN.520 controller is

“ Tracer ZN.520 Wiring Require-

m ents” )A total of two 1/4-inch

quick-connect term inals are pro-

vided for 24 VAC connection to the

board.

connector.

Caution: To prevent damage

to the unit ventilator, refer to

the diagram provided on the

inside of the unit's access

panel for specific wiring infor-

q A m inim um of 1.5" clearance

(from the pin centerline) for

wires up to 16 AWG is

recom m ended for bending and

form ing wires.

Figure 12: Power connection to the Tracer ZN.520 unit controller

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In s t a lla t io n a n d Wirin g

No t e : It m a y b e n e c e s s a ry t o

s u b d ivid e t h e zo n e w it h

m u lt ip le u n it s t o e n s u re

a d e q u a t e c o n t ro l a n d c o m fo rt

t h ro u g h o u t t h e s p a c e .

q Near radiant heat (e.g., heat

In s t a llin g t h e Wa ll-

Mo u n t e d Zo n e S e n s o r

(Op t io n a l)

em itted from appliances or the

sun);

q Near concealed pipes or

Zone sensor location is an im por-

tant elem ent of effective room

control and com fort.

chim neys;

The following are typical areas

where the zone sensor should NO T

be m ounted:

q On outside walls or other non-

conditioned surfaces; or

The best sensor location is typical-

ly on a wall, rem ote from the

HVAC unit. Readings at this loca-

tion assure that the desired set-

point is achieved across the space,

not just near the unit itself.

q In air flows from adjacent

q Near drafts or “dead spots”

zones or other units.

(e.g., behind doors or corners);

q Near hot or cold air ducts;

Figure 13: Prope r zone se nsor pla ce m e nt

No t e : All zo n e s e n s o r w irin g

w ill b e d o n e in t h e fa c t o ry

u n le s s zo n e s e n s o r o p t io n s a re

s e le c t e d t o b e w a ll m o u n t e d .

When a unit-m ounted speed

switch is selected with a wall-

m ounted zone sensor, the contrac-

tor m ust disconnect the cooling

setpoint on the unit m ounted sen-

sor if the wall m ounted cooling

setpoint is used. The zone signal

will be cut at the factory. The unit-

m ounted speed switch cannot be

used as a zone sensor.

THe com m unications link is not

connected in the factory. Com m u-

nications should be wired to the

wall-m ounted sensor.

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In s t a lla t io n a n d Wirin g

Hu m id it y a n d CO₂S e n s o rs

Hum idity and CO₂sensors should

be m ounted in a sim ilar location as

the zone sensor.

Figure 14: Relative hum idity sensor

Figure 15: CO ₂Sensor

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Typ ic a l Wirin g Dia g ra m —Wa ll

Mo u n t e d Zo n e S e n s o r

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Typ ic a l Wirin g Dia g ra m —Un it

Mo u n t e d Zo n e S e n s o r

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Typ ic a l Wirin g Dia g ra m —Un it

Mo u n t e d S w it c h , Wa ll Mo u n t e d S e n s o r

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In p u t /Ou t p u t S u m m a ry

Most binary inputs and outputs are

wired from the factory based on

unit configuration and options. If

the generic inputs and outputs are

to be used, wiring connections are

m ade at the 1/4” quick-connect ter-

m inals provided.

m ust be wired to the 1/4” quick-

connect term inals provided. Most

other analog inputs will be wired

from the factory.

The following lists all possible bi-

nary and analog inputs and out-

puts available for the classroom

unit ventilator applications. Som e

of the points listed m ay be m utual-

ly exclusive and som e are optional.

(See Table 8: Input and output

sum m ary)

Analog inputs from a wall-m ount-

ed zone sensor, hum idity sensor,

CO₂sensor, or a generic device

Ta b le 8 : In p u t a n d o u t p u t s u m m a r y

In p u t

D e s c r ip t io n

Fre e ze s t a t

Fa n S t a t u s

Bin a r y In p u t s

Oc c u p a n c y/Ge n e ric

J 1 -1 Fa n Hig h S p e e d

J 1 -3 Fa n Lo w S p e e d

J 1 -2 Ex h a u s t Fa n

J 1 -5 C o o lin g O p e n

(Mo d u la t in g va lve /DX/

Is o la t io n va lve )

J 1 -6 C o o lin g C lo s e

J 1 -7 Fa c e a n d By p a s s D a m p e r

O p e n

J 1 -8 Fa c e a n d By p a s s D a m p e r

C lo s e

Bin a r y O u t p u t s

J 1 -9 He a t O p e n (M o d u la t in g

va lve /Is o la t io n va lve ) o r 1

s t

S t a g e Ele c t r ic He a t

n d

J 1 -1 0 He a t C lo s e o r 2 S t a g e

Ele c t r ic He a t

J 1 -1 1 Ec o n o m iz e r D a m p e r

O p e n

J 1 -1 2 Ec o n o m iz e r D a m p e r

C lo s e

TB4 -1 Ge n e ric /Ba s e b o a rd

He a t

TB4 -2 2 4 VA C

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In p u t /Ou t p u t S u m m a ry

Ta b le 8 : In p u t a n d o u t p u t s u m m a r y

In p u t

D e s c r ip t io n

Zo n e Te m p e ra t u re

S e t p o in t

Fa n S p e e d

En t e r in g Wa t e r Te m p e r a t u r e

Dis c h a rg e Air Te m p e ra t u re

A n a lo g In p u t s

Ou t d o o r Air Te m p e ra t u re /

Ge n e ric

Ge n e ric /Hu m id it y/CO2 (4 -

2 0 m A )

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Co n fig u ra t io n

No t e : Th e Tra c e r Zn .5 2 0 u n it

c o n t ro lle r o n ly s u p p o rt s

c a s c a d e c o n t ro l b y c o n t ro llin g

t h e d is c h a rg e a ir t e m p e ra t u re .

Th e re fo re , t h e c o n t ro lle r

re q u ire s b o t h a s p a c e

t e m p e ra t u re in p u t a n d a

d is c h a rg e a ir t e m p e ra t u re

in p u t .

Trane configures the Tracer

a nd 2 -sta ge e le ctric he a t, fa ce -

and-bypass dam per, baseboard

ZN.520 Unit Controller at the fac-

tory per the selected unit configu- heat, dehum idification, and ge-

ration. The controller is applied

classroom unit ventilator configu-

rations that support m odulating

valves, 2-position valves, econo-

m izer dam per (m odulating only),

direct expansion (DX) cooling, 1-

neric I/O. The controller also sup-

ports HIG H and LO W fan speeds

with exhaust fan output on 1- and

2-speed fan applications.

Ta b le 9 : Ty p ic a l a p p lic a t io n s s u p p o r t e d

Co n fig u ra t io n

Ty p e o f v a lv e

O p t io n s

Ele c t r ic He a t Ec o n o m ize r

Ba s e b o a rd

He a t

Mo d u la t in g

2 p o s it io n

(1 o r 2 s t a g e )

D a m p e r

2-pipe cooling only

2-pipe heating only

2-pipe changeover

4-p ip e

4-pipe changeover

2-pipe face bypass heating only

2-pipe face bypass changeover

4-pipe face bypass

DX cooling only

DX cooling, 2-pipe he a ting

DX cooling, electric heating

Electric heat only (1 or 2 stage)

1. Isolation valves are 2-position only.

Co n fig u ra b le p a ra m e t e rs

Rover service tool uses the unit

type to determ ine and download

m any other aspects of the unit con-

figuration, such as the default ana-

log input configuration, the default

binary input configuration, and the

He a t in g s o u rc e

q None

q Hydronic

q Dedicated hydronic

q Steam

default binary output configura-

tion.

q Electric heat

q Hydronic (m ain coil

changeover) + dedicated

hydronic (auxiliary coil)

Co o lin g s o u rc e

q None

q Hydronic (m ain coil

changeover)

q Dedicated hydronic

q DX

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Co n fig u ra t io n

Bin a ry Ou t p u t s

Ta b le 1 0 : Bin a r y o u t p u t s u m m a r y

Bin a ry o u t p u t

Cla s s ro o m u n it ve n t ila t o r

Va lid ra n g e

J 1-1

J 1-2

J 1-3

J 1-4

Fa n high

Exhaust fan or none

Fan low

(Key)

Cooling valve open

Face bypass cool isolation valve

2-position cooling

Norm ally open or norm ally closed

J 1-5

Norm ally open or norm ally closed²

J 1-6

J 1-7

J 1-8

Cooling valve close

Face bypass dam per open

Face bypass dam per close

Heating valve open

Face bypass heat isolation valve

Electric heat stage 1

2-position heating

Heating valve close

Electric heat stage 2

Outdoor a ir da m pe r ope n

Ou td o o r a ir ca m p e r clo s e

Norm ally open or norm ally closed²

J 1-9

Norm ally open or norm ally closed

J 1-10

J 1-11

J 1-12

TB4 -1 /TB4 -2

Te r m in a ls

Ou t p u t Ra t in g

Lo a d En e rg ize d

Lo a d De -e n e rg ize d

24 VAC RMS (typ ica l)

Generic/baseboard heat output

24 VAC

TB4-1

TB4-2

12 VA

1 VAC RMS (typical)

1. Trane’s Rover service tool uses the unit type to determ ine and download the proper default binary output configuration.

2. The norm ally open/closed configuration item refers to the inactive state of the controlled end device (such as an 2-position cooling valve

output).

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Co n fig u ra t io n

Bin a ry In p u t s

Ta b le 1 1 : Bin a r y in p u t s u m m a r y

Bin a r y in p u t

Co n fig u ra t io n

Va lid ra n g e

No rm a lly o p e n

No rm a lly clo s e d

BI 1

BI 2

BI 3

BI 4

Low coil tem perature detection or not used

No rm a lly o p e n

No rm a lly clo s e d

No t u s e d

No rm a lly o p e n

No rm a lly clo s e d

Occupancy, generic, or not used

Fa n s ta tu s o r n o t u s e d

No rm a lly o p e n

No rm a lly clo s e d

1. Trane Rover service tool uses the unit type to determ ine and download the proper default binary input configuration.

An a lo g In p u t s

Ta b le 1 2 : A n a lo g in p u t s u m m a r y

A n a lo g in p u t

C o n f ig u r a t io n

Ca lib ra t io n ra n g e

+/- 10.0°F

Zone

Space tem perature

(0.1°F resolution)

+/- 10.0°F

S e t

Setpoint (hardwired)

Fa n s w itch

(0.1°F resolution)

Fa n

AI 1

AI 2

N A

Entering water tem perature

Discharge air tem perature

Outdoor air tem perature or generic tem perature input

(No te 2)

AI 3

AI 4

N A

Hu m id ity, CO2 o r g e n e ric

4-20m A in p u t

1. Trane Rover service tool uses the unit type to determ ine and download the proper default analog input configuration.

2. Analog input 3 (AI 3) configured as generic tem perature input does not affect unit operation. When configured, the Tracer™ ZN .520 Unit

Controller com m unicates the generic tem perature value to Rover or Tracer Sum m it and displays it as generic tem perature.

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Co n fig u ra t io n

Fa n Co n fig u ra t io n

Ta b le 1 3 : Fa n c o n f ig u r a t io n r a n g e s

Fa n c o n fig u ra t io n

D e f a u lt

Va lid r a n g e

Continuous (during occupied)

Cycling with capacity (unoccupied)

Fan operation in heating

Fa n o p e ra tio n in co o lin g

Co n tin u o u s

Continuous (during occupied)

Cycling with capacity (unoccupied)

Co n tin u o u s

Varies ²

Num ber of fan speeds

1, 2

Configurable fan speed heating

Configurable fan speed cooling

Zo n e s e n s o r fa n s w itch

Varies

Off, lo w , h ig h , a u to

Disable or enable

Varies

En a b le

En d De vic e Co n fig u ra t io n s

Ta b le 1 4 : En d d e v ic e r a n g e s

De fa u lt

Va lid ra n g e

Main, cooling/changeover valve stroke tim e

En te rin g w a te r s a m p lin g

Varies²

30 - 360 se conds

Disable or enable

30 to 360 s e co n d s

0 to 100%

Varies

Auxiliary, heating valve stroke tim e

Ou td o o r a ir d a m p e r s tro ke tim e

Varies

Varies²

15%

Occu p ie d o u td o o r a ir d a m p e r m in im u m p o s itio n

Occupied standby outside air dam per m inim um

p o s itio n

15%

0 to 100%

Alternate m inim um outside air dam per position

fo r lo w fa n s p e e d

40%

5 5 °F

0 to 100%

Eco n o m ize r e n a b le te m p e ra tu re

30 to 70°F

0 to 100%, 101% disables the

exhaust fan

Exha ust fa n e na ble se tpoint

Face-and-bypass dam per stroke tim e

65 s e co n d s

30-360 seconds

1. The exhaust fan is energized when the outdoor air dam per is equal to or greater than the exhaust fan enable point, and the exhaust fan

is turned off when the outdoor air dam per is 10% less than the exhaust fan enable point.

2. Varies with unit configuration.

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Co n fig u ra t io n

S e t p o in t s

Ta b le 1 5 : S e t p o in t d e f a u lt s

S e t p o in t

D e f a u lt

Va lid ra n g e

Occupied heating setpoint

71°F

74°F

40 to 115°F

Disable or enable

Occupied cooling setpoint

Occupied standby heating setpoint

Occupied standby cooling setpoint

Un o ccu p ie d h e a tin g s e tp o in t

Unoccupied cooling setpoint

67 °F

78 °F

60°F

85°F

Heating setpoint low lim it

40°F

Cooling setpoint low lim it¹

40°F

Heating setpoint high lim it

105 °F

110 °F

En a b le

Cooling setpoint high lim it

Th u m b w h e e l s e tp o in t

1. The heating and cooling setpoint high and low lim its only apply to the occupied and occupied standby setpoints and are never applied

to the unoccupied setpoints.

Dis c h a rg e Air Lim it s

Ta b le 1 6 : Dis c h a rg e a ir lim it ra n g e s

D e f a u lt

Va lid ra n g e

Low lim it ¹

38 °F

150 °F

45 °F

30 to 50°F

38 to 150°F

35 to 150°F

Control point high lim it

Control point low lim it

1. The low lim it is the tem perature at which the controller shuts down the unit to prevent the coil from freezing.

2. The control algorithm is lim ited to calculating this discharge air tem perature based on capacity request.

Fre e ze Avo id a n c e

Ta b le 1 7 : Fre e ze a vo id a n c e s e t p o in t ra n g e

De fa u lt

Va lid ra n g e

Fre e ze a voida nce se tpoint

40 °F

20 to 60°F

The controller disables freeze avoidance when the outdoor air tem perature rises 3 °F above the freeze avoidance setpoint.

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Co n fig u ra t io n

Oc c u p ie d Byp a s s Tim e r

Ta b le 1 8 : By p a s s t im e r r a n g e

D e f a u lt

Va lid ra n g e

0 to 240 m inutes

Occupancy bypass tim er

120 Minutes

(1 m inute resolution)

1. The occupied bypass tim er is used for tim ed override applications.

P o w e r-Up Co n t ro l Wa it

Ta b le 1 9 : Co n t ro l w a it t im e r

De fa u lt

Va lid r a n g e

Power up control wait (2 m inutes)

120 seconds

Disable or enable

Ma in t e n a n c e Tim e rs

Ta b le 2 0 : Ma in t e n a n c e t im e r ra n g e

D e f a u lt

Va lid ra n g e

Maintenance tim er

0 to 10,000 hours

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Lo c a t io n Id e n t ifie r

Un it Id e n t ific a t io n

Ta g

The unit identification tag is factory

m ounted and provided for easy

identification of an installed unit. It

contains m odel num ber, tagging,

and location inform ation.

The top portion of the unit identifi-

cation tag rem ains perm anently af-

fixed to the unit for identification

purposes. The bottom portion of

the tag provides pertinent inform a-

tion that is rem ovable to be placed

on building plans or in “ Appen-

dix—Location Identifier” o n

page68. This provides identifica-

tion history about the unit’s loca-

tion for quick reference.

These tags provide inform ation

about

q unit serial num ber;

q NID (neuron identification

num ber)—The NID is sim ilar to

the serial num ber of the unit

but is specific to the

identification of the Tracer

ZN.520 unit controller circuit

board; and

q unit location—The location

identification is a custom er

defined, clear English

description, of the unit’s

No t e : Fo ld a n d t e a r c a re fu lly a lo n g d a s h e d re m o va b le lin e .

physical location. This is a 27

character description, including

spaces, of the location. For

exam ple, if the location

identification for a unit is

“Conference Room 101”, the

ZN.520, Rover (the Trane

Com m 5 service tool), and

Tracer Sum m it, will recognize

this clear English description.

Figure 16: Unit identification tag

Im p o rt a n t ! If t h e s t a t u s LED o n

t h e ZN.5 2 0 d o e s n o t b lin k , t h e

d e vic e m a y n o t b e

c o m m u n ic a t in g o r it m a y n o t

Win k in g

b e t h e d e vic e yo u s e le c t e d

a c c o rd in g t o t h e s t o re d

a d d re s s .

Winking a device causes the green

status LED on the device selected

to blink at a rate of twice per sec-

ond for approxim ately 10 seconds.

This feature is useful when a dis-

A Tracer ZN.520 unit controller

m ay be set to wink by

If location identification is not de-

fined, it will default to the unit seri- crepancy in device location exists.

q holding the ON button on the

al num ber. This unit identification

tag provides som e inform ation so

the user has m ultiple references to

the unit. The blank location is pro-

vided for field m odification in case

the unit is m oved from the initial

location.

As part of the troubleshooting pro-

cess, one person can W INK the de-

vice while another can observe the

blinking and verify the device’s

physical location.

zone sensor for 5 seconds

q using Rover, Trane’s

com m unication service tool

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P o w e r-Up

O CC UP IED m o d e

O CC U PIED BYP A S S m o d e

When 24 VAC is initially applied to

the controller, the following se-

quence of events occurs:

When the controller is in the O C CU -

P IED m ode, the unit attem pts to

m aintain the space tem perature at

the active occupied heating or

cooling setpoint.

The O CCU P IED BY PA S S m ode is

used to transition the unit from the

U N O CCU P IED m ode to the O CC U -

P IE D m ode for a period of tim e

from 0 to 4 hours (configurable

through Rover. Default=RU N ). The

controller can be placed in OC CU -

P IE D BYP AS S m ode by either com -

m unicating an occupancy request

of BYPASS or by using the TIM ED

O VE RRID E (i.e., O N ) button on the

Trane zone sensor.

q Green status LED turns ON .

q All outputs are controlled OFF.

O CC UP IED m ode is the default

m ode of the Tracer ZN.520 control-

ler.

q The controller reads input

values to determ ine initial

values.

q Random -start tim er expires (5

U N O CCU P IE D m o d e

to 30 seconds).

When the controller is in the U N -

O CC UP IED m ode, the unit attem pts

to m aintain space tem perature at

the stored unoccupied heating or

cooling setpoint (i.e., config-

urable through Tracer Sum m it or

the Rover service tool) regardless

of the presence of a hardwired or

com m unicated setpoint. When

the space tem perature exceeds

the stored unoccupied setpoint,

the controller brings on 100% of

the prim ary heating or cooling ca-

pacity.

q When P OW ER-U P CO N TRO L W A IT

is enabled, the controller waits

0-120 seconds (depending on

configuration) to allow am ple

tim e for com m unicated control

data to input. If the controller

does not receive com m uni-

cated inform ation, standalone

control is assum ed.

O N a n d CA N CEL Bu t t o n s

Som e Trane zone sensors have ON

and CANCEL buttons for tim ed over-

ride operation. Pressing the ON

button on the zone sensor when

the unit is in the U N O CC U PIED

m ode initiates the O CC U PIED BY-

P A S S m ode and initializes the by-

pass tim er. The CANCEL button is

used to send the unit back into U N -

O CC U PIED m ode before the bypass

tim er has expired.

q All m odulating valves and

dam pers calibrate closed.

q N O RMA L operation begins.

The ON button m ay also be used

for the unit identification or the

“ WIN K” feature. (See “Winking”

on page38.for m ore inform ation.)

When the Tracer ZN.520 controller

is connected to a Tracer Sum m it

system or the Rover service tool,

the ON button m ay be used in place

of the service pin for easy unit

identification.

The UN O CC U PIED m ode can be ini-

tiated through a hardwired signal

to the occupancy binary input or

by a com m unicated request.

Oc c u p a n c y

The valid occupancy m odes for the

Tracer ZN.520 controller are:

q O CC U PIED - Norm al operating

m ode for occupied spaces or

daytim e operation.

O CC UP IED S TA N D BY m o d e

The OC CU P IED STA N D BY m ode al-

lows the unit to operate at a heat-

ing or cooling setpoint between

the occupied and unoccupied set-

points to help m aintain the envi-

ronm ent while decreasing energy

consum ption.

q U N O CCU P IED - Norm al

operating m ode for

unoccupied spaces or

nighttim e operation.

He a t in g An d Co o lin g

Ch a n g e o ve r Lo g ic

q O CC U PIED S TA N D BY - Mode

used to reduce the heating and

cooling dem ands, while

The Tracer™ ZN.520 Unit Control-

ler can receive com m unicated re-

quests for heating or cooling

operation. The com m unicated

variable nviApplicMode is used to

com m unicate the requests for the

controller's operating m ode based

on the following values:

This m ode decreases the ventila-

tion for heating or cooling during

brief periods of vacancy in the

space. Unit operation in this m ode

is sim ilar to the occupied m ode ex-

cept for the different heating and

cooling setpoints and a different

outside air dam per position.

providing ventilation, during

the occupied hours when the

space is vacant or unoccupied.

q O CC U PIED BYP A S S -Used to

tem porarily place the unit into

the occupied operation.

The occupancy m ode can be hard-

wired to the controller via the oc-

cupancy binary input or

0 = Auto (m ode determ ined by

controller)

The OC CU P IED STA N D BY m ode is

initiated only when occupancy is

com m unicated to the Tracer

ZN.520 controller and the hard-

wired signal to the occupancy in-

put is calling for unoccupied

operation.

1 = Heat (uses heating

setpoints)

com m unicated to the controller.

2 = Morning Warm -up

3 = Cool (uses cooling

setpoints)

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4 = Night Purge (air

9 = Fan Only (no heating or

cooling allowed)

perature) is (900°FhSec). Integra-

tion only begins once the heating

and cooling capacity is equal to 0%

or the discharge air tem perature is

being lim ited by the discharge air

tem perature control lim its.(See

Figure 17: “Heat/Cool Changeover

logic” ).

changeover) not supported

5 = Pre-cool (m orning cool

down)

All other enum erations will be in-

terpreted as Auto.

6 = Off (no unit operation

allowed)

As the controller autom atically de-

term ines its heating or cooling

m ode, it changes from cool to heat

or from heat to cool, while the error

(integrated over tim e between the

active setpoint and the space tem -

7 = Test (special test m ode)

8 = Em ergency Heat not

supported

Figure 17: Heat/Cool Changeover logic

If the m easured space tem perature

is 69 °F and the active cooling set-

point is 72 °F, the error between

the space tem perature and the set-

point is three degrees. If the sam e

error exists for one m inute (60 sec-

onds), the integration term is

cooling setpoint or lower than the

active heating setpoint.

com pressors. For these units, cen-

tral heating or cooling plan opera-

tion is not required for heating or

cooling because they are capable

of providing their own local heat-

ing or cooling.

Exa m p le : If the cooling setpoint is

75 °F and the heating setpoint

70 °F, any space tem perature

greater than 75 °F or less than 70 °F

is outside the setpoint range.

For 2-pipe changeover and 4-pipe

changeover units with hydronic ca-

pacity, heating and cooling is pro-

vided through hydronic. For those

hydronic, central heating or cool-

ing plant operation is required for

the unit to deliver heating or cool-

ing. To determ ine whether the cen-

tral plant is providing the desired

water tem perature, an entering

water tem perature sensor (either

hardwired or com m unicated) m ust

be present.

(3 °Fh60 Sec) or (180 °Fh Sec).

Once the integration term is satis-

fied and the space tem perature is

outside the setpoint range, the

controller changes m odes. Howev-

er, before the unit's heating or

cooling capacity ram ps up, the

controller checks to m ake sure it is

capable of heating or cooling.

The Tracer™ ZN.520 Unit Control-

ler changes from heating to cool-

ing and cooling to heating when

the integration term exceeds

(900 °FhSec). Along with satisfy-

ing the integration for heating and

cooling changeover, the m easured

space tem perature m ust fall out-

side the setpoint range. This

m eans the space tem perature

m ust be greater than the active

For som e units, heating and cool-

ing capability exists with local re-

sources such as electric heat or

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The entering water m ust be five

degrees or m ore above the space

tem perature to allow hydronic

heating, and five degrees or m ore

below the space tem perature to al-

low hydronic cooling.

lows the fan speed switch to be

disabled. When this occurs, the

unit will operate at the default fan

speed unless a com m unicated re-

quest is present.

He a t in g Op e ra t io n

During the H EA TIN G m ode, the

Tracer ZN.520 controller attem pts

to m aintain the space tem perature

at the active heating setpoint.

Based on the controller’s occupan-

cy m ode, the active heating set-

point is one of the following:

During O CCU P IE D, O CCU P IE D

If the desired water tem perature is

available, the unit begins norm al

heating and cooling operation. If

the m easured entering water tem -

perature is not adequate for the

desired heating or cooling, the

controller begins the entering wa-

ter tem perature sam pling logic.

S TA N D BY , and O C CU P IED BY PA S S

m odes, the fan will norm ally oper-

ate continuously at the appropri-

ate fan speed. The fan will only be

O FF in these m odes when the MA N -

U A L O U TP UT TES T has been initiat-

ed, a latching diagnostic is

q Occupied heating setpoint

q Occupied standby heating

setpoint

q Unoccupied heating setpoint

present, or the com m unicated or

hardwired fan speed is OFF. (See

“ Manual Output Test” on

The controller uses the m easured

space tem perature, the active

heating setpoint, and discharge air

tem perature along with the con-

trol algorithm to determ ine the re-

quested heating capacity of the

unit (0-100%). The outputs are con-

trolled based on the unit configu-

ration and the requested heating

capacity.

The Tracer™ ZN.520 Unit Control-

ler operates the m odulating valves

and dam pers based on a heating

or cooling capacity calculated by

the control algorithm . The control

algorithm calculates the heating or

cooling capacity based on the

m easured space tem perature, the

active setpoint and the discharge

air tem perature. When the m ea-

sured space tem perature is within

the active heating and cooling set-

points, the heating and cooling ca-

pacity approaches zero.

page48.for m ore inform ation.)

During the U NO C CU P IED m ode, the

unit fan is controlled OFF. When ca-

pacity is required to m aintain the

unoccupied heating or cooling set-

point, the unit fan is controlled to

high speed regardless of a hard-

wired or com m unicated fan speed.

Ta b le 2 1 : A b s o lu t e t w o -s p e e d f a n

s w it c h p o in t s

Fa n Op e ra t io n

For m ultiple fan speed applica-

tions, the Tracer ZN.520 controller

allows separate default fan speeds

to be configured for heating and

cooling m odes. When the fan

m ode switch is in the AUTO posi-

tion or no hardwired input exists,

the fan operates at the configured

default fan speed (i.e, HIGH).

Fa n S p e e d

Ch a n g e

A b s o lu t e

Te m p e ra t u re Erro r

Co o lin g Op e ra t io n

Low to High

High to Low

2.00 °F

During the C O OLIN G m ode, the

Tracer ZN.520 controller attem pts

to m aintain the space tem perature

at the active cooling setpoint.

Based on the controller’s occupan-

cy m ode, the active cooling set-

point is one of the following:

1.25 °F

Fa n Off De la y

When a heating output is con-

trolled off, the Tracer™ ZN.520

Unit Controller autom atically

holds the fan on for an additional

30 seconds. This 30-second delay

gives the fan tim e to blow off any

residual heat from the heating

source, such as a steam coil. When

the unit is heating, the fan off de-

lay is norm ally applied to control

the fan; otherwise, the fan off de-

lay does not apply.

The Tracer ZN.520 controller also

allows the default fan speed to be

configured as AU TO . When the fan

speed switch is in the AUTO posi-

tion and the default fan speed is

configured as AU TO , the unit m ay

change fan speeds based on the

requested heating or cooling ca-

pacity. In this m ode, the unit fan

will operate at LOW speed until the

requested capacity requires HIGH

fan speed operation to m aintain

space com fort.

q Occupied cooling setpoint

q Occupied standby cooling

setpoint

q Unoccupied cooling setpoint

The controller uses the m easured

space tem perature, the active

cooling setpoint, and discharge air

tem perature along with the con-

trol algorithm to determ ine the re-

quested cooling capacity of the

unit (0-100%). The outputs are con-

trolled based on the unit configu-

ration and the requested cooling

capacity.

Fa n S t a rt On Hig h S p e e d

The fan m ode request can be ei-

ther hardwired or com m unicated

to the Tracer ZN.520 controller.

When both are present, the com -

m unicated request has priority

over the hardwired input. Addi-

tional flexibility in the controller al-

On a transition from off to any oth-

er fan speed, the Tracer™ ZN.520

Unit Controller autom atically

starts the fan on high speed and

runs the fan at high speed for 0.5

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seconds. This provides the am ple

torque required to start all fan m o-

tors from the off position.

Fa c e -a n d -Byp a s s

Is o la t io n Va lve s

Va lve Op e ra t io n

Mo d u la t in g Va lve s

Face-and-bypass units m ay use

isolation valves to prevent unwant-

ed water flow in the coil. This elim -

inates problem s such as radiant

heat or excessive condensate in 2-

pipe system s.

Exh a u s t fa n /d a m p e r

o p e ra t io n

The Tracer ZN.520 controller sup-

ports one or two m odulating

valves for hydronic heating and

cooling operation. The m ain valve/

coil is used for cooling only, heat/

cool changeover (2-pipe applica-

tions), or cooling (4-pipe applica-

tions). The auxiliary valve/coil

provides heating in 4-pipe and

heating only applications.

This binary point is a shared point

with m edium fan speed. For this

point to be used for exhaust con-

trol, the controller m ust be config-

ured for a 1- or 2-speed fan. The

exhaust fan/dam per is coordinated

with the unit fan and outdoor

dam per operation. The exhaust

output is energized only when the

unit fan is operating and the out-

door dam per position is greater

than or equal to the configurable

exhaust enable point. The exhaust

fan output is disabled when the

outdoor air dam per position drops

10% below the exhaust enable

point. If the enable point is less

than 10%, the unit turns on at the

enable point and off at 0.

In 4-pipe applications, the isolation

valves are used to prevent conflict-

ing capacities within the unit.

Fa c e -a n d -Byp a s s

Da m p e r Op e ra t io n

At power-up, the Tracer ZN.520

controller drives the m odulating

valves to the closed position. The

controller calibrates to the full

closed position by overdriving the

actuator 135%. Whenever the con-

troller requests a valve position of

zero or 100%, the controller over-

drives the actuator 135% regard-

less of the current valve position.

No t e : Th e Fa c e -a n d -b yp a s s

a c t u a t o r is lo c a t e d in t h e rig h t -

h a n d e n d p o c k e t o f t h e

c la s s ro o m u n it ve n t ila t o r.

The Tracer ZN.520 controller actu-

ates a face-and- bypass dam per to

m odulate a percentage of air to the

face of the coil to m aintain space

com fort. When a requested capaci-

ty is present, the unit m odulates

the dam per to allow m ore air to the

face of the coil. An averaging sen-

sor is used on the discharge air to

provide accurate capacity control.

Figure 18: Horizontal unit with face-and-bypass dam per option.

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controller for standalone applica-

tions.

point. Default m inim um dam per

positions are provided and can be

changed for occupied and occu-

pied standby m odes, or for low

speed operation. The controller

can also receive a com m unicated

outdoor air dam per m inim um po-

sition from Tracer Sum m it. A com -

m unicated m inim um position

from Tracer Sum m it has priority

over all configured setpoints.

When a unit uses 2-way m odulat-

ing valves, it is possible for the wa-

ter near the entering water

tem perature sensor to m igrate to-

wards am bient tem perature. The

Tracer ZN.520 controller has a wa-

ter sam pling feature for these ap-

plications. When the sensed water

tem perature is not sufficient for

the requested heat/cool m ode

(5°F above the zone tem perature

for heating or 5°F below the zone

tem perature for cooling), the con-

troller drives the valve fully open.

The controller then m onitors the

water tem perature until the appro-

priate tem perature is sensed or

until the three m inute tim e lim it

expires. If the water tem perature is

acceptable for the requested ca-

pacity, the unit continues norm al

operation. If the three m inute tim -

er expires and the water tem pera-

ture is still unsuitable, the unit

closes the valve and waits one

hour before invoking the sam pling

feature again.

During the OC CU P IED m ode the

outdoor air dam per will always be

controlled to the effective m ini-

m um position unless ASHRAE Cy-

cle I, ASHRAE Cycle II, or

econom izing m odes are active.

Figure 19: Vertical unit with face-and-

bypa ss da m pe r ope ra tions

Ta b le 2 2 : Wa t e r a s s u m p t io n c h a rt

Upon power-up, the controller cal-

ibrates the face-and-bypass dam p-

er to the full bypass position by

overdriving the dam per actuator.

During norm al operation, whenev-

er the Tracer ZN.520 controller

generates a face-and-bypass

dam per position request of zero or

100%, the unit calibrates the actu-

ator by overdriving the dam per ac-

tuator 135%.

Te m p e ra t u re

U n it C o n f ig u r a t io n

A s s u m e d ¹

2-pipe Heating valve

2-pipe cooling valve

Hot

Cold

Figure 20: OA/RA actuator m ounting for

the vertical unit ventilator

2-pipe H/C valve with

Hot

auto changeover enabled

2-pipe H/C valve with

auto changeover

disabled

Cold

1. Assum ption based on absence of a valid

e n te rin g w a te r te m p e ra tu re

En t e rin g Wa t e r

Te m p e ra t u re

S a m p lin g

Units with 4-pipe changeover and

2-pipe changeover require an en-

tering water tem perature to deter-

m ine if the appropriate water

tem perature is present for the re-

quested m ode (heating or cool-

ing). This tem perature m ay be

com m unicated in an ICS system or

hardwired to the Tracer ZN.520

Mo d u la t in g Ou t d o o r

Air Op e ra t io n

The Tracer ZN.520 controller oper-

ates a m odulating (3-wire floating)

outdoor air dam per actuator ac-

cording to the effective occupan-

cy, outdoor air tem perature, space

tem perature, effective setpoint,

discharge air tem perature, and

discharge air tem perature set-

Figure 21: Figure 2: OA/RA actuator

m ounting for the horizontal unit ventilator

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Au t o m a t ic Ou t d o o r Air

Da m p e r Ad ju s t m e n t

AS HRAE Cyc le II

Ele c t ric He a t

Op e ra t io n

The Tracer ZN.520 controller sup-

ports 1 or 2 stages of electric heat

control.

The Tracer ZN.520 controller con-

form s to ASHRAE Cycle II by allow-

ing the m odulating outdoor air

dam per to m aintain a m inim um

position during the occupied m ode

unless econom izing is enabled or

the space tem perature falls m ore

than 3°F below the effective set-

point.

The Tracer ZN.520 controller is ca-

pable of using different m inim um

outdoor air dam per positions for

high and low fan speeds, which are

configurable. This allows the venti-

lation rate to be m aintained when

switching between fan speeds.

To control space tem perature,

electric heat is cycled to control the

discharge air tem perature. The rate

of cycling is dependent on the load

in the space and the tem perature of

the incom ing fresh air.

No t e : Th e t yp ic a l re d u c t io n in

a irflo w b e t w e e n h ig h a n d lo w

fa n s p e e d s is 2 5 % , h o w e ve r, if

p re c is e c o n t ro l is d e s ire d , a n

a ir b a la n c e r s h o u ld b e

If the space tem perature falls m ore

than 2°F below the setpoint, the

outdoor air dam per will begin to

close. When the space tem perature

hits 3°F below the setpoint, the

outdoor air dam per is com pletely

closed.

Ba s e b o a rd He a t

Op e ra t io n

c o n s u lt e d .

The Tracer ZN.520 controller can

be configured to support one stage

of baseboard heat. A 2 position

valve or an electric heat contactor

will be energized at 2.5°F below

the effective heating setpoint. The

baseboard heat is de-energized at

1°F below the effective heating

setpoint.

Ec o n o m ize r

Op e ra t io n

No t e : Wh e n t h e re is a re q u e s t

fo r 0 % o r 1 0 0 % a c t u a t o r

p o s it io n , t h e a c t u a t o r w ill

o ve rd rive t h e a c t u a t o r 1 3 5 % t o

h e lp m a in t a in c a lib ra t io n .

With a valid outdoor air tem pera-

ture (hardwired or com m unicated),

Tracer ZN.520 uses the m odulating

econom izer dam per as the highest

priority source of cooling.

The unit will provide heating ca-

pacity as required regardless of the

presence of baseboard heat. If the

unit can not m aintain the space

tem perature, the baseboard heat

will com e on as a secondary stage.

The controller initiates the econo-

m izer function if the outdoor air

tem perature is cold enough to be

used for free cooling capacity. If

the outdoor air tem perature is less

than the econom izer enable set-

point (absolute dry bulb), the con-

troller m odulates the outdoor air

dam per between the m inim um po-

sition and 100% to control the

am ount of cooling capacity. When

the outdoor air tem perature rises

5°F above the econom izer enable

setpoint, the outdoor air dam per

returns to its m inim um position

and m echanical cooling is initiated.

If baseboard heat is to be used as

the prim ary source of heating, the

discharge air high lim it should be

set to a m oderate tem perature.

This will allow the ventilation air to

be tem pered and avoid a “drafty”

feeling. The baseboard heat will

then operate as the heating capaci-

ty for the space.

Figure 22: ASHRAE cycle 2

DX Op e ra t io n

Tracer ZN.520 supports direct ex-

pansion (DX) com pressor opera-

tion for cooling only.

In the UN O CC U PIED m ode, the

baseboard heat and unit heating

capacity are brought on sim ulta-

neously as needed to m aintain the

unoccupied setpoint.

The controller does not allow both

the DX com pressor and econom iz-

er to operate at the sam e tim e. This

prevents problem s where the en-

tering air tem perature is too low

for the evaporator coil to operate

as designed.

Exh a u s t Fa n

Op e ra t io n

The exhaust fan is coordinated

with the unit fan and outdoor air

dam per operation. The exhaust fan

output is energized only when the

unit fan is operating and the out-

door air dam per position is greater

AS HRAE Cyc le I

Tracer ZN.520 also includes a fixed

m inim um on/off tim e of 3 m inutes

for com pressor operation to pre-

vent short cycling of the com pres-

sor.

ASHRAE Cycle I adm its 100% out-

door air except during the warm up

cycle or the unoccupied m ode. To

set up the Tracer ZN.520 controller

for ASHRAE Cycle I conform ance,

set the occupied outdoor air dam p-

er m inim um position to 100%.

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than or equal to the configurable

exhaust enable setpoint. This is

useful for exhaust fans designed

to offset the added econom izer

ventilation.

The fan status is reported as

OFF when none of the fan out-

puts are directed ON.

Dehum idification is possible when

m echanical cooling is available;

the heating capacity is in the re-

heat position; and the space rela-

tive hum idity setpoint is valid.

2. The Tracer ZN.520 controller

has a binary input available

for a fan status device (current

sensing relay or differential

pressure switch) which can

provide feedback of fan opera-

tion. If the device does not

indicate fan operation after 1

m inute, a unit shutdown is ini-

tiated, and the unit is latched

OFF.

The exhaust fan is disabled when

the outdoor air dam per position

drops 10% below the exhaust en-

able point. If the exhaust fan en-

able setpoint is less than 10%, the

Tracer ZN.520 controller energizes

the exhaust fan at the enable point

and disables it when the outdoor

air dam per closes.

The controller starts dehum idify-

ing the space when the space hu-

m idity exceeds the hum idity

setpoint. The controller continues

to dehum idify until the sensed hu-

m idity falls below the setpoint m i-

nus the relative hum idity offset.

The controller uses the cooling

and reheat coils sim ultaneously to

dehum idify the space. When de-

hum idifying, the discharge air

tem perature is controlled to m ain-

tain the space tem perature at the

current setpoint.

Ou t p u t Ove rrid e s

Filt e r S t a t u s /

Ma in t e n a n c e Tim e r

The unit filter status\m aintenance

tim er is based on the cum ulative

run hours of the unit fan. The con-

troller com pares the fan run tim e

against an adjustable fan run hour

lim it and recom m ends unit m ain-

tenance as required.

Ma n u a l Ou t p u t Te s t

Econom izing is disabled during

the dehum idification m ode.

Manual output test allows the bi-

nary outputs to be energized in a

predefined sequence.(For m ore in-

form ation see, Manual Output

Test, on page 48 for m ore inform a-

tion.)

No t e : Wh ile in t h e

d e h u m id ific a t io n m o d e , if

t h e re is a c a ll fo r c a p a c it y b y

t h e u n it , t h e zo n e t e m p e ra t u re

s e t p o in t w ill t a k e p rio rit y o ve r

t h e re la t ive h u m id it y

The Rover service tool is used to

edit the m aintenance required set-

point tim e. Once the setpoint lim it

is exceeded, the controller gener-

ates a MAIN TENANCE REQUIRED infor-

m ational diagnostic. When the

m aintenance required setpoint

tim e is set to zero, the controller

disables this feature.

Wa t e r Va lve Ove rrid e

s e t p o in t s .

To enable quicker water balanc-

ing, the controller allows a user to

specify the desired state of all wa-

ter valves. The values supported

are:

D EFRO S T

For defrost operation, a sensor is

wired in series with the DX cooling

relay. When a defrost condition is

detected, the condensing unit is

disabled, and the unit is placed in

the D EFRO S T m ode.

q Open all valves

You can use the Trace Sum m it or

the Rover service tool to clear the

MAINTENANCE REQ UIRED inform a-

tional diagnostic. Once the diag-

nostic is cleared, the controller

resets the fan run tim e to zero and

begins accum ulating fan run

hours again.

q Close all valves

The valves in the system will re-

m ain open for two hours or until

norm al operation is resum ed.

During D EFRO S T the condensing

unit is O FF the outside air dam per

is set to the m inim um positions,

and the fan will continue to oper-

ate as continuous. The unit will re-

m ain in the D EFRO S T m ode until

the senor resets at 48°F. The unit

will return to N O RMA L operation af-

ter the m ode is discontinued.

The Tracer Sum m it or the Rover

service tool is required to access

this feature.

No t e : If a t a n y t im e t h e u n it

lo s e s p o w e r, t h e t im e r is re s e t

t o ze ro .

Fa n S t a t u s

There are two ways to do fan sta-

tus m onitoring:

Ot h e r Mo d e s

FRE EZE A V OID A N CE

1. The status of the fan is

reported based on the state of

the binary output(s) dedicated

to fan control. The fan status

is reported as HIG H or LOW

whenever the corresponding

binary output is directed ON.

FRE EZE A V OID A N CE is used as low

am bient tem perature protection,

and is only invoked when the fan is

O FF. This includes the UN OCCU PIED

m ode when there is no call for ca-

pacity, or any other tim e the fan is

D EHU M IDIFICA TIO N

No t e : If t h e u n it is in t h e

u n o c c u p ie d m o d e , t h e

d e h u m id ific a t io n ro u t in e w ill

n o t o p e ra t e

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OFF due to a safety or com m and.

The controller enters the FRE EZE

A VO ID A N CE m ode when an out-

door air tem perature is present

(com m unicated or hardwired) and

it is below the freeze avoidance set-

point (configurable). The controller

disables freeze avoidance when

the outdoor air tem perature rises

3°F above the freeze avoidance

setpoint.

The dam per rem ains closed indefi- a peer controller over a twisted pair

nitely during m orning warm -up

of com m unication wire with or

until the space tem perature is with- without the presence of a front end

in 2°F of the effective heating set-

point. The unit runs at full capacity

until setpoint is m et.

building m anagem ent system .

(See Figure 23: “Sim ple data shar-

ing application ” ) This ability al-

lows units to operate with the

sam e data to prevent conflicting

control.

CO O L-DO W N

The Tracer ZN.520 controller keeps

the m odulating outdoor air dam p-

er closed for up to one hour at ev-

ery transition from U N OC CU P IED to

OC CU P IED m ode when the space

tem perature is 3°F or m ore above

the cooling setpoint.

Data sharing is established

through the use of “bindings”.

Bindings are set up through the

Rover service tool.

When the controller is in the freeze

avoidance m ode:

q All water valves are driven

open to allow water flow

through the coil

The Tracer ZN.520 controller in-

cludes a network variable for m as-

ter/slave operation. This variable

includes all of the inform ation re-

quired for the slave units to oper-

ate with m aster controller. (See

Figure 24: “More com plex data

sharing application”)

The dam per rem ains closed during

cool-down until the space tem per-

ature is within 2°F of the effective

cooling setpoint. The unit runs at

full capacity until setpoint is m et.

q Fan is OFF

q Face-and-bypass dam per

(when present) is in full BYPASS

q DX and electric heat are OFF

For m ore inform ation on establish-

ing bindings, see the Rover service

tool m anual. For a com plete listing

on shared points see “Appendix—

Data Lists” on page64.

Da t a S h a rin g —Lo n Wo rk s

MO RN IN G WA RM -U P

Tracer ZN.520 allows peer-to-peer

data com m unication through the

use of LonWork’s technology. Data

such as space tem perature set-

point, occupancy, etc. can be

The Tracer ZN.520 controller keeps

the m odulating outdoor air dam p-

er closed anytim e during the O CCU -

P IED m ode when the space

tem perature is 3°F or m ore below

the heating setpoint.

shared from a m aster controller to

Figure 23: Sim ple data sharing application

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Figure 24: More com plex data sharing application

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P o w e r-Up

O CC UP IED m o d e

O CC U PIED BYP A S S m o d e

When 24 VAC is initially applied to

the controller, the following se-

quence of events occurs:

When the controller is in the O C CU -

P IED m ode, the unit attem pts to

m aintain the space tem perature at

the active occupied heating or

cooling setpoint.

The O CCU P IED BY PA S S m ode is

used to transition the unit from the

U N O CCU P IED m ode to the O CC U -

P IE D m ode for a period of tim e

from 0 to 4 hours (configurable

through Rover. Default=RU N ). The

controller can be placed in OC CU -

P IE D BYP AS S m ode by either com -

m unicating an occupancy request

of BYPASS or by using the TIM ED

O VE RRID E (i.e., O N ) button on the

Trane zone sensor.

q Green status LED turns ON .

q All outputs are controlled OFF.

O CC UP IED m ode is the default

m ode of the Tracer ZN.520 control-

ler.

q The controller reads input

values to determ ine initial

values.

q Random -start tim er expires (5

U N O CCU P IE D m o d e

to 30 seconds).

When the controller is in the U N -

O CC UP IED m ode, the unit attem pts

to m aintain space tem perature at

the stored unoccupied heating or

cooling setpoint (i.e., config-

urable through Tracer Sum m it or

the Rover service tool) regardless

of the presence of a hardwired or

com m unicated setpoint. When

the space tem perature exceeds

the stored unoccupied setpoint,

the controller brings on 100% of

the prim ary heating or cooling ca-

pacity.

q When P OW ER-U P CO N TRO L W A IT

is enabled, the controller waits

0-120 seconds (depending on

configuration) to allow am ple

tim e for com m unicated control

data to input. If the controller

does not receive com m uni-

cated inform ation, standalone

control is assum ed.

O N a n d CA N CEL Bu t t o n s

Som e Trane zone sensors have ON

and CANCEL buttons for tim ed over-

ride operation. Pressing the ON

button on the zone sensor when

the unit is in the U N O CC U PIED

m ode initiates the O CC U PIED BY-

P A S S m ode and initializes the by-

pass tim er. The CANCEL button is

used to send the unit back into U N -

O CC U PIED m ode before the bypass

tim er has expired.

q All m odulating valves and

dam pers calibrate closed.

q N O RMA L operation begins.

The ON button m ay also be used

for the unit identification or the

“ WIN K” feature. (See “Winking”

on page38.for m ore inform ation.)

When the Tracer ZN.520 controller

is connected to a Tracer Sum m it

system or the Rover service tool,

the ON button m ay be used in place

of the service pin for easy unit

identification.

The UN O CC U PIED m ode can be ini-

tiated through a hardwired signal

to the occupancy binary input or

by a com m unicated request.

Oc c u p a n c y

The valid occupancy m odes for the

Tracer ZN.520 controller are:

q O CC U PIED - Norm al operating

m ode for occupied spaces or

daytim e operation.

O CC UP IED S TA N D BY m o d e

The OC CU P IED STA N D BY m ode al-

lows the unit to operate at a heat-

ing or cooling setpoint between

the occupied and unoccupied set-

points to help m aintain the envi-

ronm ent while decreasing energy

consum ption.

q U N O CCU P IED - Norm al

operating m ode for

unoccupied spaces or

nighttim e operation.

He a t in g An d Co o lin g

Ch a n g e o ve r Lo g ic

q O CC U PIED S TA N D BY - Mode

used to reduce the heating and

cooling dem ands, while

The Tracer™ ZN.520 Unit Control-

ler can receive com m unicated re-

quests for heating or cooling

operation. The com m unicated

variable nviApplicMode is used to

com m unicate the requests for the

controller's operating m ode based

on the following values:

This m ode decreases the ventila-

tion for heating or cooling during

brief periods of vacancy in the

space. Unit operation in this m ode

is sim ilar to the occupied m ode ex-

cept for the different heating and

cooling setpoints and a different

outside air dam per position.

providing ventilation, during

the occupied hours when the

space is vacant or unoccupied.

q O CC U PIED BYP A S S -Used to

tem porarily place the unit into

the occupied operation.

The occupancy m ode can be hard-

wired to the controller via the oc-

cupancy binary input or

0 = Auto (m ode determ ined by

controller)

The OC CU P IED STA N D BY m ode is

initiated only when occupancy is

com m unicated to the Tracer

ZN.520 controller and the hard-

wired signal to the occupancy in-

put is calling for unoccupied

operation.

1 = Heat (uses heating

setpoints)

com m unicated to the controller.

2 = Morning Warm -up

3 = Cool (uses cooling

setpoints)

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4 = Night Purge (air

9 = Fan Only (no heating or

cooling allowed)

perature) is (900°FhSec). Integra-

tion only begins once the heating

and cooling capacity is equal to 0%

or the discharge air tem perature is

being lim ited by the discharge air

tem perature control lim its.(See

Figure 17: “Heat/Cool Changeover

logic” ).

changeover) not supported

5 = Pre-cool (m orning cool

down)

All other enum erations will be in-

terpreted as Auto.

6 = Off (no unit operation

allowed)

As the controller autom atically de-

term ines its heating or cooling

m ode, it changes from cool to heat

or from heat to cool, while the error

(integrated over tim e between the

active setpoint and the space tem -

7 = Test (special test m ode)

8 = Em ergency Heat not

supported

Figure 17: Heat/Cool Changeover logic

If the m easured space tem perature

is 69 °F and the active cooling set-

point is 72 °F, the error between

the space tem perature and the set-

point is three degrees. If the sam e

error exists for one m inute (60 sec-

onds), the integration term is

cooling setpoint or lower than the

active heating setpoint.

com pressors. For these units, cen-

tral heating or cooling plan opera-

tion is not required for heating or

cooling because they are capable

of providing their own local heat-

ing or cooling.

Exa m p le : If the cooling setpoint is

75 °F and the heating setpoint

70 °F, any space tem perature

greater than 75 °F or less than 70 °F

is outside the setpoint range.

For 2-pipe changeover and 4-pipe

changeover units with hydronic ca-

pacity, heating and cooling is pro-

vided through hydronic. For those

hydronic, central heating or cool-

ing plant operation is required for

the unit to deliver heating or cool-

ing. To determ ine whether the cen-

tral plant is providing the desired

water tem perature, an entering

water tem perature sensor (either

hardwired or com m unicated) m ust

be present.

(3 °Fh60 Sec) or (180 °Fh Sec).

Once the integration term is satis-

fied and the space tem perature is

outside the setpoint range, the

controller changes m odes. Howev-

er, before the unit's heating or

cooling capacity ram ps up, the

controller checks to m ake sure it is

capable of heating or cooling.

The Tracer™ ZN.520 Unit Control-

ler changes from heating to cool-

ing and cooling to heating when

the integration term exceeds

(900 °FhSec). Along with satisfy-

ing the integration for heating and

cooling changeover, the m easured

space tem perature m ust fall out-

side the setpoint range. This

m eans the space tem perature

m ust be greater than the active

For som e units, heating and cool-

ing capability exists with local re-

sources such as electric heat or

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The entering water m ust be five

degrees or m ore above the space

tem perature to allow hydronic

heating, and five degrees or m ore

below the space tem perature to al-

low hydronic cooling.

lows the fan speed switch to be

disabled. When this occurs, the

unit will operate at the default fan

speed unless a com m unicated re-

quest is present.

He a t in g Op e ra t io n

During the H EA TIN G m ode, the

Tracer ZN.520 controller attem pts

to m aintain the space tem perature

at the active heating setpoint.

Based on the controller’s occupan-

cy m ode, the active heating set-

point is one of the following:

During O CCU P IE D, O CCU P IE D

If the desired water tem perature is

available, the unit begins norm al

heating and cooling operation. If

the m easured entering water tem -

perature is not adequate for the

desired heating or cooling, the

controller begins the entering wa-

ter tem perature sam pling logic.

S TA N D BY , and O C CU P IED BY PA S S

m odes, the fan will norm ally oper-

ate continuously at the appropri-

ate fan speed. The fan will only be

O FF in these m odes when the MA N -

U A L O U TP UT TES T has been initiat-

ed, a latching diagnostic is

q Occupied heating setpoint

q Occupied standby heating

setpoint

q Unoccupied heating setpoint

present, or the com m unicated or

hardwired fan speed is OFF. (See

“ Manual Output Test” on

The controller uses the m easured

space tem perature, the active

heating setpoint, and discharge air

tem perature along with the con-

trol algorithm to determ ine the re-

quested heating capacity of the

unit (0-100%). The outputs are con-

trolled based on the unit configu-

ration and the requested heating

capacity.

The Tracer™ ZN.520 Unit Control-

ler operates the m odulating valves

and dam pers based on a heating

or cooling capacity calculated by

the control algorithm . The control

algorithm calculates the heating or

cooling capacity based on the

m easured space tem perature, the

active setpoint and the discharge

air tem perature. When the m ea-

sured space tem perature is within

the active heating and cooling set-

points, the heating and cooling ca-

pacity approaches zero.

page48.for m ore inform ation.)

During the U NO C CU P IED m ode, the

unit fan is controlled OFF. When ca-

pacity is required to m aintain the

unoccupied heating or cooling set-

point, the unit fan is controlled to

high speed regardless of a hard-

wired or com m unicated fan speed.

Ta b le 2 1 : A b s o lu t e t w o -s p e e d f a n

s w it c h p o in t s

Fa n Op e ra t io n

For m ultiple fan speed applica-

tions, the Tracer ZN.520 controller

allows separate default fan speeds

to be configured for heating and

cooling m odes. When the fan

m ode switch is in the AUTO posi-

tion or no hardwired input exists,

the fan operates at the configured

default fan speed (i.e, HIGH).

Fa n S p e e d

Ch a n g e

A b s o lu t e

Te m p e ra t u re Erro r

Co o lin g Op e ra t io n

Low to High

High to Low

2.00 °F

During the C O OLIN G m ode, the

Tracer ZN.520 controller attem pts

to m aintain the space tem perature

at the active cooling setpoint.

Based on the controller’s occupan-

cy m ode, the active cooling set-

point is one of the following:

1.25 °F

Fa n Off De la y

When a heating output is con-

trolled off, the Tracer™ ZN.520

Unit Controller autom atically

holds the fan on for an additional

30 seconds. This 30-second delay

gives the fan tim e to blow off any

residual heat from the heating

source, such as a steam coil. When

the unit is heating, the fan off de-

lay is norm ally applied to control

the fan; otherwise, the fan off de-

lay does not apply.

The Tracer ZN.520 controller also

allows the default fan speed to be

configured as AU TO . When the fan

speed switch is in the AUTO posi-

tion and the default fan speed is

configured as AU TO , the unit m ay

change fan speeds based on the

requested heating or cooling ca-

pacity. In this m ode, the unit fan

will operate at LOW speed until the

requested capacity requires HIGH

fan speed operation to m aintain

space com fort.

q Occupied cooling setpoint

q Occupied standby cooling

setpoint

q Unoccupied cooling setpoint

The controller uses the m easured

space tem perature, the active

cooling setpoint, and discharge air

tem perature along with the con-

trol algorithm to determ ine the re-

quested cooling capacity of the

unit (0-100%). The outputs are con-

trolled based on the unit configu-

ration and the requested cooling

capacity.

Fa n S t a rt On Hig h S p e e d

The fan m ode request can be ei-

ther hardwired or com m unicated

to the Tracer ZN.520 controller.

When both are present, the com -

m unicated request has priority

over the hardwired input. Addi-

tional flexibility in the controller al-

On a transition from off to any oth-

er fan speed, the Tracer™ ZN.520

Unit Controller autom atically

starts the fan on high speed and

runs the fan at high speed for 0.5

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seconds. This provides the am ple

torque required to start all fan m o-

tors from the off position.

Fa c e -a n d -Byp a s s

Is o la t io n Va lve s

Va lve Op e ra t io n

Mo d u la t in g Va lve s

Face-and-bypass units m ay use

isolation valves to prevent unwant-

ed water flow in the coil. This elim -

inates problem s such as radiant

heat or excessive condensate in 2-

pipe system s.

Exh a u s t fa n /d a m p e r

o p e ra t io n

The Tracer ZN.520 controller sup-

ports one or two m odulating

valves for hydronic heating and

cooling operation. The m ain valve/

coil is used for cooling only, heat/

cool changeover (2-pipe applica-

tions), or cooling (4-pipe applica-

tions). The auxiliary valve/coil

provides heating in 4-pipe and

heating only applications.

This binary point is a shared point

with m edium fan speed. For this

point to be used for exhaust con-

trol, the controller m ust be config-

ured for a 1- or 2-speed fan. The

exhaust fan/dam per is coordinated

with the unit fan and outdoor

dam per operation. The exhaust

output is energized only when the

unit fan is operating and the out-

door dam per position is greater

than or equal to the configurable

exhaust enable point. The exhaust

fan output is disabled when the

outdoor air dam per position drops

10% below the exhaust enable

point. If the enable point is less

than 10%, the unit turns on at the

enable point and off at 0.

In 4-pipe applications, the isolation

valves are used to prevent conflict-

ing capacities within the unit.

Fa c e -a n d -Byp a s s

Da m p e r Op e ra t io n

At power-up, the Tracer ZN.520

controller drives the m odulating

valves to the closed position. The

controller calibrates to the full

closed position by overdriving the

actuator 135%. Whenever the con-

troller requests a valve position of

zero or 100%, the controller over-

drives the actuator 135% regard-

less of the current valve position.

No t e : Th e Fa c e -a n d -b yp a s s

a c t u a t o r is lo c a t e d in t h e rig h t -

h a n d e n d p o c k e t o f t h e

c la s s ro o m u n it ve n t ila t o r.

The Tracer ZN.520 controller actu-

ates a face-and- bypass dam per to

m odulate a percentage of air to the

face of the coil to m aintain space

com fort. When a requested capaci-

ty is present, the unit m odulates

the dam per to allow m ore air to the

face of the coil. An averaging sen-

sor is used on the discharge air to

provide accurate capacity control.

Figure 18: Horizontal unit with face-and-bypass dam per option.

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controller for standalone applica-

tions.

point. Default m inim um dam per

positions are provided and can be

changed for occupied and occu-

pied standby m odes, or for low

speed operation. The controller

can also receive a com m unicated

outdoor air dam per m inim um po-

sition from Tracer Sum m it. A com -

m unicated m inim um position

from Tracer Sum m it has priority

over all configured setpoints.

When a unit uses 2-way m odulat-

ing valves, it is possible for the wa-

ter near the entering water

tem perature sensor to m igrate to-

wards am bient tem perature. The

Tracer ZN.520 controller has a wa-

ter sam pling feature for these ap-

plications. When the sensed water

tem perature is not sufficient for

the requested heat/cool m ode

(5°F above the zone tem perature

for heating or 5°F below the zone

tem perature for cooling), the con-

troller drives the valve fully open.

The controller then m onitors the

water tem perature until the appro-

priate tem perature is sensed or

until the three m inute tim e lim it

expires. If the water tem perature is

acceptable for the requested ca-

pacity, the unit continues norm al

operation. If the three m inute tim -

er expires and the water tem pera-

ture is still unsuitable, the unit

closes the valve and waits one

hour before invoking the sam pling

feature again.

During the OC CU P IED m ode the

outdoor air dam per will always be

controlled to the effective m ini-

m um position unless ASHRAE Cy-

cle I, ASHRAE Cycle II, or

econom izing m odes are active.

Figure 19: Vertical unit with face-and-

bypa ss da m pe r ope ra tions

Ta b le 2 2 : Wa t e r a s s u m p t io n c h a rt

Upon power-up, the controller cal-

ibrates the face-and-bypass dam p-

er to the full bypass position by

overdriving the dam per actuator.

During norm al operation, whenev-

er the Tracer ZN.520 controller

generates a face-and-bypass

dam per position request of zero or

100%, the unit calibrates the actu-

ator by overdriving the dam per ac-

tuator 135%.

Te m p e ra t u re

U n it C o n f ig u r a t io n

A s s u m e d ¹

2-pipe Heating valve

2-pipe cooling valve

Hot

Cold

Figure 20: OA/RA actuator m ounting for

the vertical unit ventilator

2-pipe H/C valve with

Hot

auto changeover enabled

2-pipe H/C valve with

auto changeover

disabled

Cold

1. Assum ption based on absence of a valid

e n te rin g w a te r te m p e ra tu re

En t e rin g Wa t e r

Te m p e ra t u re

S a m p lin g

Units with 4-pipe changeover and

2-pipe changeover require an en-

tering water tem perature to deter-

m ine if the appropriate water

tem perature is present for the re-

quested m ode (heating or cool-

ing). This tem perature m ay be

com m unicated in an ICS system or

hardwired to the Tracer ZN.520

Mo d u la t in g Ou t d o o r

Air Op e ra t io n

The Tracer ZN.520 controller oper-

ates a m odulating (3-wire floating)

outdoor air dam per actuator ac-

cording to the effective occupan-

cy, outdoor air tem perature, space

tem perature, effective setpoint,

discharge air tem perature, and

discharge air tem perature set-

Figure 21: Figure 2: OA/RA actuator

m ounting for the horizontal unit ventilator

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Un it Op e ra t io n

Au t o m a t ic Ou t d o o r Air

Da m p e r Ad ju s t m e n t

AS HRAE Cyc le II

Ele c t ric He a t

Op e ra t io n

The Tracer ZN.520 controller sup-

ports 1 or 2 stages of electric heat

control.

The Tracer ZN.520 controller con-

form s to ASHRAE Cycle II by allow-

ing the m odulating outdoor air

dam per to m aintain a m inim um

position during the occupied m ode

unless econom izing is enabled or

the space tem perature falls m ore

than 3°F below the effective set-

point.

The Tracer ZN.520 controller is ca-

pable of using different m inim um

outdoor air dam per positions for

high and low fan speeds, which are

configurable. This allows the venti-

lation rate to be m aintained when

switching between fan speeds.

To control space tem perature,

electric heat is cycled to control the

discharge air tem perature. The rate

of cycling is dependent on the load

in the space and the tem perature of

the incom ing fresh air.

No t e : Th e t yp ic a l re d u c t io n in

a irflo w b e t w e e n h ig h a n d lo w

fa n s p e e d s is 2 5 % , h o w e ve r, if

p re c is e c o n t ro l is d e s ire d , a n

a ir b a la n c e r s h o u ld b e

If the space tem perature falls m ore

than 2°F below the setpoint, the

outdoor air dam per will begin to

close. When the space tem perature

hits 3°F below the setpoint, the

outdoor air dam per is com pletely

closed.

Ba s e b o a rd He a t

Op e ra t io n

c o n s u lt e d .

The Tracer ZN.520 controller can

be configured to support one stage

of baseboard heat. A 2 position

valve or an electric heat contactor

will be energized at 2.5°F below

the effective heating setpoint. The

baseboard heat is de-energized at

1°F below the effective heating

setpoint.

Ec o n o m ize r

Op e ra t io n

No t e : Wh e n t h e re is a re q u e s t

fo r 0 % o r 1 0 0 % a c t u a t o r

p o s it io n , t h e a c t u a t o r w ill

o ve rd rive t h e a c t u a t o r 1 3 5 % t o

h e lp m a in t a in c a lib ra t io n .

With a valid outdoor air tem pera-

ture (hardwired or com m unicated),

Tracer ZN.520 uses the m odulating

econom izer dam per as the highest

priority source of cooling.

The unit will provide heating ca-

pacity as required regardless of the

presence of baseboard heat. If the

unit can not m aintain the space

tem perature, the baseboard heat

will com e on as a secondary stage.

The controller initiates the econo-

m izer function if the outdoor air

tem perature is cold enough to be

used for free cooling capacity. If

the outdoor air tem perature is less

than the econom izer enable set-

point (absolute dry bulb), the con-

troller m odulates the outdoor air

dam per between the m inim um po-

sition and 100% to control the

am ount of cooling capacity. When

the outdoor air tem perature rises

5°F above the econom izer enable

setpoint, the outdoor air dam per

returns to its m inim um position

and m echanical cooling is initiated.

If baseboard heat is to be used as

the prim ary source of heating, the

discharge air high lim it should be

set to a m oderate tem perature.

This will allow the ventilation air to

be tem pered and avoid a “drafty”

feeling. The baseboard heat will

then operate as the heating capaci-

ty for the space.

Figure 22: ASHRAE cycle 2

DX Op e ra t io n

Tracer ZN.520 supports direct ex-

pansion (DX) com pressor opera-

tion for cooling only.

In the UN O CC U PIED m ode, the

baseboard heat and unit heating

capacity are brought on sim ulta-

neously as needed to m aintain the

unoccupied setpoint.

The controller does not allow both

the DX com pressor and econom iz-

er to operate at the sam e tim e. This

prevents problem s where the en-

tering air tem perature is too low

for the evaporator coil to operate

as designed.

Exh a u s t Fa n

Op e ra t io n

The exhaust fan is coordinated

with the unit fan and outdoor air

dam per operation. The exhaust fan

output is energized only when the

unit fan is operating and the out-

door air dam per position is greater

AS HRAE Cyc le I

Tracer ZN.520 also includes a fixed

m inim um on/off tim e of 3 m inutes

for com pressor operation to pre-

vent short cycling of the com pres-

sor.

ASHRAE Cycle I adm its 100% out-

door air except during the warm up

cycle or the unoccupied m ode. To

set up the Tracer ZN.520 controller

for ASHRAE Cycle I conform ance,

set the occupied outdoor air dam p-

er m inim um position to 100%.

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Un it Op e ra t io n

than or equal to the configurable

exhaust enable setpoint. This is

useful for exhaust fans designed

to offset the added econom izer

ventilation.

The fan status is reported as

OFF when none of the fan out-

puts are directed ON.

Dehum idification is possible when

m echanical cooling is available;

the heating capacity is in the re-

heat position; and the space rela-

tive hum idity setpoint is valid.

2. The Tracer ZN.520 controller

has a binary input available

for a fan status device (current

sensing relay or differential

pressure switch) which can

provide feedback of fan opera-

tion. If the device does not

indicate fan operation after 1

m inute, a unit shutdown is ini-

tiated, and the unit is latched

OFF.

The exhaust fan is disabled when

the outdoor air dam per position

drops 10% below the exhaust en-

able point. If the exhaust fan en-

able setpoint is less than 10%, the

Tracer ZN.520 controller energizes

the exhaust fan at the enable point

and disables it when the outdoor

air dam per closes.

The controller starts dehum idify-

ing the space when the space hu-

m idity exceeds the hum idity

setpoint. The controller continues

to dehum idify until the sensed hu-

m idity falls below the setpoint m i-

nus the relative hum idity offset.

The controller uses the cooling

and reheat coils sim ultaneously to

dehum idify the space. When de-

hum idifying, the discharge air

tem perature is controlled to m ain-

tain the space tem perature at the

current setpoint.

Ou t p u t Ove rrid e s

Filt e r S t a t u s /

Ma in t e n a n c e Tim e r

The unit filter status\m aintenance

tim er is based on the cum ulative

run hours of the unit fan. The con-

troller com pares the fan run tim e

against an adjustable fan run hour

lim it and recom m ends unit m ain-

tenance as required.

Ma n u a l Ou t p u t Te s t

Econom izing is disabled during

the dehum idification m ode.

Manual output test allows the bi-

nary outputs to be energized in a

predefined sequence.(For m ore in-

form ation see, Manual Output

Test, on page 48 for m ore inform a-

tion.)

No t e : Wh ile in t h e

d e h u m id ific a t io n m o d e , if

t h e re is a c a ll fo r c a p a c it y b y

t h e u n it , t h e zo n e t e m p e ra t u re

s e t p o in t w ill t a k e p rio rit y o ve r

t h e re la t ive h u m id it y

The Rover service tool is used to

edit the m aintenance required set-

point tim e. Once the setpoint lim it

is exceeded, the controller gener-

ates a MAIN TENANCE REQUIRED infor-

m ational diagnostic. When the

m aintenance required setpoint

tim e is set to zero, the controller

disables this feature.

Wa t e r Va lve Ove rrid e

s e t p o in t s .

To enable quicker water balanc-

ing, the controller allows a user to

specify the desired state of all wa-

ter valves. The values supported

are:

D EFRO S T

For defrost operation, a sensor is

wired in series with the DX cooling

relay. When a defrost condition is

detected, the condensing unit is

disabled, and the unit is placed in

the D EFRO S T m ode.

q Open all valves

You can use the Trace Sum m it or

the Rover service tool to clear the

MAINTENANCE REQ UIRED inform a-

tional diagnostic. Once the diag-

nostic is cleared, the controller

resets the fan run tim e to zero and

begins accum ulating fan run

hours again.

q Close all valves

The valves in the system will re-

m ain open for two hours or until

norm al operation is resum ed.

During D EFRO S T the condensing

unit is O FF the outside air dam per

is set to the m inim um positions,

and the fan will continue to oper-

ate as continuous. The unit will re-

m ain in the D EFRO S T m ode until

the senor resets at 48°F. The unit

will return to N O RMA L operation af-

ter the m ode is discontinued.

The Tracer Sum m it or the Rover

service tool is required to access

this feature.

No t e : If a t a n y t im e t h e u n it

lo s e s p o w e r, t h e t im e r is re s e t

t o ze ro .

Fa n S t a t u s

There are two ways to do fan sta-

tus m onitoring:

Ot h e r Mo d e s

FRE EZE A V OID A N CE

1. The status of the fan is

reported based on the state of

the binary output(s) dedicated

to fan control. The fan status

is reported as HIG H or LOW

whenever the corresponding

binary output is directed ON.

FRE EZE A V OID A N CE is used as low

am bient tem perature protection,

and is only invoked when the fan is

O FF. This includes the UN OCCU PIED

m ode when there is no call for ca-

pacity, or any other tim e the fan is

D EHU M IDIFICA TIO N

No t e : If t h e u n it is in t h e

u n o c c u p ie d m o d e , t h e

d e h u m id ific a t io n ro u t in e w ill

n o t o p e ra t e

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OFF due to a safety or com m and.

The controller enters the FRE EZE

A VO ID A N CE m ode when an out-

door air tem perature is present

(com m unicated or hardwired) and

it is below the freeze avoidance set-

point (configurable). The controller

disables freeze avoidance when

the outdoor air tem perature rises

3°F above the freeze avoidance

setpoint.

The dam per rem ains closed indefi- a peer controller over a twisted pair

nitely during m orning warm -up

of com m unication wire with or

until the space tem perature is with- without the presence of a front end

in 2°F of the effective heating set-

point. The unit runs at full capacity

until setpoint is m et.

building m anagem ent system .

(See Figure 23: “Sim ple data shar-

ing application ” ) This ability al-

lows units to operate with the

sam e data to prevent conflicting

control.

CO O L-DO W N

The Tracer ZN.520 controller keeps

the m odulating outdoor air dam p-

er closed for up to one hour at ev-

ery transition from U N OC CU P IED to

OC CU P IED m ode when the space

tem perature is 3°F or m ore above

the cooling setpoint.

Data sharing is established

through the use of “bindings”.

Bindings are set up through the

Rover service tool.

When the controller is in the freeze

avoidance m ode:

q All water valves are driven

open to allow water flow

through the coil

The Tracer ZN.520 controller in-

cludes a network variable for m as-

ter/slave operation. This variable

includes all of the inform ation re-

quired for the slave units to oper-

ate with m aster controller. (See

Figure 24: “More com plex data

sharing application”)

The dam per rem ains closed during

cool-down until the space tem per-

ature is within 2°F of the effective

cooling setpoint. The unit runs at

full capacity until setpoint is m et.

q Fan is OFF

q Face-and-bypass dam per

(when present) is in full BYPASS

q DX and electric heat are OFF

For m ore inform ation on establish-

ing bindings, see the Rover service

tool m anual. For a com plete listing

on shared points see “Appendix—

Data Lists” on page64.

Da t a S h a rin g —Lo n Wo rk s

MO RN IN G WA RM -U P

Tracer ZN.520 allows peer-to-peer

data com m unication through the

use of LonWork’s technology. Data

such as space tem perature set-

point, occupancy, etc. can be

The Tracer ZN.520 controller keeps

the m odulating outdoor air dam p-

er closed anytim e during the O CCU -

P IED m ode when the space

tem perature is 3°F or m ore below

the heating setpoint.

shared from a m aster controller to

Figure 23: Sim ple data sharing application

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Un it Op e ra t io n

Figure 24: More com plex data sharing application

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Troubleshooting

Important! When viewing the

Tracer ZN.520 through the

Rover service tool, it is

important that the version be

up-to-date. To help ensure that

your version is the most

recent, contact you local Trane

sales representative or service

center.

The Service push button, located

Yellow Comm LED

at the bottom center of the control-

ler, can be used to install the Trac-

er™ ZN.520 Unit Controller in a

communication network. Refer to

the Rover and Tracer Summit

product literature for more infor-

mation.

The yellow Comm LED blinks at the

rate the controller receives

communication. The yellow LED

does not blink when the controller

is transmitting communication

data.

Table 25: Yellow comm LED activity

Yellow LED Description

activity

Led Operation

LED OFF

continuously. detecting any

communication. (Normal

The controller is not

Red Service LED

Table 23: Red service LED activity

for standalone

applications.)

Red LED

Description

activity

LED blinks or The controller detects

flickers.

communication. (Normal

for communicating

applications, including

data sharing.)

LED is OFF

continuously

after power is Normal operation.

applied to the

controller.

Figure 25: Black service button

LED ON

Abnormal condition or

continuously. extremely high traffic on

the link.

Green Status LED

LED is ON

continuously,

The green LED normally indicates

whether or not the controller is

powered on (24 VAC).

Someone is pressing the

even when

Manual Output Test

Service push button or

power is first

applied to the

The test sequence verifies output

and end device operation. The

manual output test can be conduct-

ed to verify output wiring and actu-

ator operation, without using the

Rover service tool, by pressing the

test button.

the controller has failed.

Table 24: Green status LED activity

controller.

Un-install (normal

controller mode). Use

Rover service tool to

Green LED

activity

Description

LED is ON

continuously.

Power ON (normal

operation).

LED flashes

restore the unit to

about once

normal operation. Refer

every second.

LED blinks (1 blink The controller is in

to the Rover product

literature for more

information.

per second).

manual output test

mode.

No diagnostics

present.

LED blinks (2

The controller is in

Black Service Push

Button

blinks per second). manual output test

mode.

One or more

diagnostics are

present.

Note: If the Service push

button is held down for more

than 15 seconds, the Tracer™

ZN.520 Unit Controller will un-

install itself from the ICS

Figure 26: Blue test button

LED blinks (1/4

second on, 1/4

second off for 10

seconds).

Wink mode.

Many service calls are initiated due

to unit diagnostics, so the test se-

quence attempts to clear unit diag-

nostics and restore normal unit

operation prior to testing the out-

puts. If the diagnostics remain after

an attempt to clear diagnostics, the

status LED lights in a two-blink pat-

tern, indicating the diagnostic con-

dition is still present.

communication network and

shut down all unit operation.

This mode is indicated by the

red Service LED flashing once

every second. See the Red

Service LED section. Use Rover

service tool to restore the unit

to normal operation.

LED OFF.

Power is off.

Controller failure.

Test button is

pressed.

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Troubleshooting

If a two-blink pattern remains after

an attempt to clear diagnostics,

the diagnostic condition is still

present and may affect the manual

output test. The diagnostic must

then be cleared using another

method. (See “Resetting Diagnostics” on

page 54.for more information.)

release the button to start the

test mode.

Alternatively, the manual output

test can be controlled over the

communications network by using

Rover.

2. When manual output test

mode begins, the controller

turns off all outputs and cali-

brates modulating end

devices closed.

When conducting the manual out-

put test via communications net-

work, the sequence must start with

Step 1 (OFF), as shown in Table 26:

Test sequence for non face-and-bypass unit

configurations and Table 27: Test se-

quence for face-and-bypass unit configura-

tions However, subsequent steps

may be conducted in any order.

3. Press the Test button once to

advance through the test

sequence.

Test Procedure

The procedure for testing is:

Note: To help ensure accurate

testing do not press the test

button more than once per

second.

1. Press and hold the Test button

for at least two seconds, then

Table 26: Test sequence for non face-and-bypass unit configurations

DX, or cool or

heat/cool changeover

valve

Generic/

baseboard

heat

Face-and-

bypass damper

Electric heat, or

Outdoor air

damper

Step

Fan

heat valve

J1-1

J1-2 J1-3

J1-5

J1-6

J1-7

J1-8

J1-9

J1-10

J1-11 J1-12

TB4-1

Hydronic: on

EH: off

1: Off

Off

2: Fan high

High

Off

Med

Off

3: Fan med

4: Fan low

Off

Low

5: Main open,

DX on

High

Off

6: Main close,

DX off, aux

High

Off

open, EH1 on

7: Aux open,

EH1 on, exhaust High

fan

Exh

Off

8: Aux close,

EH1 off, EH2 on, High

damper open

Off

9: Damper close High

10: Generic /

baseboard heat

High

energized

11: Exit

Exit

1. Upon entering manual output test mode, the controller turns off all fan, DX, and electric heat outputs and drives all dampers and valves

closed (if required).

2. At the beginning of step 2, the controller attempts to clear all diagnostics.

3. If the unit is configured for a 3-speed fan, the medium fan speed output will energize at step 3. If the unit is configured for a 2-speed fan,

the fan remains on high speed at step 3.

4. If the unit is configured for a 3-speed fan, the medium fan speed output energizes at step 3. If the unit is configured for a 2-speed fan, the

low fan speed output energizes at step 3. If the unit is configured for a 1-speed fan, the fan remains on high speed at step 3.

5. If the unit is configured for a 1- or 2-speed fan, the exhaust fan output energizes on step 7. The exhaust fan output is shared with medium

fan speed.

6. After step 10, the test sequence performs an exit. This initiates a reset and attempts to return the controller to normal operation

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Troubleshooting

Table 27: Test sequence for face-and-bypass unit configurations

Generic/

baseboard

heat

DX, or cool or heat/

cool changeover valve bypass damper or heat valve

Face-and-

Electric heat,

Outdoor air

damper

Step

Fan

J1-1

J1-2

J1-3

J1-5

J1-6

J1-7

J1-8

J1-9

J1-10 J1-11 J1-12

TB4-1

1: Off

Off

High

Off

2: Fan high

3: Fan med

Med

Off

4: Fan low

Off

Low

5: Main open,

DX on

High

Off

6: Main close,

DX off, aux

open

7: Aux open,

exhaust fan

High

Exh

Off

8: Aux close,

damper open

9: Outdoor air

damper close

10: Generic /

baseboard heat High

energized

Off

11: Exit

Exit

1. Upon entering manual output test mode, the controller turns off all fan outputs and drives all dampers and valves closed (if required).

2. At the beginning of step 2, the controller attempts to clear all diagnostics.

3. If the unit is configured for a 2-speed fan, the fan remains on high speed at step 3.

4. If the unit is configured for a 2-speed fan, the low fan speed output energizes at step 3. If the unit is configured for a 1-speed fan, the fan

remains on high speed at step 3.

5. If the unit is configured for a 1- or 2-speed fan, the exhaust fan output energizes on step 7. The exhaust fan output is shared with medium

fan speed.

6. After step 10, the test sequence performs an exit. This initiates a reset and attempts to return the controller to normal operation.

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Troubleshooting

Discharge Air

Maintenance Required

Safeties

Temperature Limit

Note: If power to the unit is

cycled or discontinued for any

reason, all maintenance timers

are automatically reset.

The “Maintenance Required” di-

agnostic is generated when the fan

run-time exceeds the configurable

limit. This diagnostic is useful for

filter change notification.

Freeze Protection

When the discharge air exceeds

the high or low limit setpoint and

the unit can not correct it by alter-

ing capacity, a “Discharge Air

Temp Limit” diagnostic is generat-

ed.

The Tracer ZN.520 controller has

two methods of freeze protection.

1. An optional binary freezestat

that is wired to a binary input.

The freezestat is a capillary

tube type and is factory set to

35 °F. When this device opens,

a “Low Coil Temp Detect”

diagnostic is generated.

Outdoor Air Temperature

Failure

Local Fan Mode Failure

If the Tracer ZN.520 has validated

an outdoor air temperature input

and then the input becomes in-

valid, an outdoor air temperature

failure diagnostic occurs.

If the hardwired fan mode input to

the Tracer ZN.520 controller is

present and then becomes invalid,

a local fan mode failure diagnostic

is generated.

2. Using the discharge air tem-

perature sensor, if the dis-

charge air temperature falls

below the discharge air low

limit, the controller increases

the heating capacity to temper

the air. If the discharge air

temperature remains below

the discharge air low limit for

3 minutes, the controller gen-

erates a “Low Coil Temp

Humidity Input Failure

Local Setpoint Failure

If the Tracer ZN.520 has validated

a relative humidity input and then

the input becomes invalid, a hu-

midity input failure diagnostic oc-

curs.

If the hardwired setpoint input to

the Tracer ZN.520 controller is

present and then becomes invalid,

a local setpoint failure diagnostic

is generated.

Detect” diagnostic.

CO₂Sensor Failure

Fan Failure

Generic Temperature

Failure

If the Tracer ZN.520 has validated

a CO₂input and then the input be-

comes invalid, a CO₂input failure

diagnostic occurs.

A “Low Air Flow—Fan Failure” di-

agnostic is generated when a fan

status device is present and fails to

close after 1 minute of unit start-up

or when it opens for more than 1

minute during normal unit opera-

tion.

If the Tracer ZN.520 has validated

a generic temperature input and

then the input becomes invalid, a

generic temperature input failure

diagnostic occurs.

Generic AIP Failure

If the Tracer ZN.520 has validated

a generic analog input and then

the input becomes invalid, a ge-

neric analog input failure diagnos-

tic occurs.

Space Temperature

Failure

Invalid Unit

Configuration

If the Tracer ZN.520 has validated

a space temperature input and

then the input becomes invalid, a

space temperature failure diag-

nostic occurs.

If the Tracer ZN.520 has been con-

figured improperly or loses its

configuration, an invalid unit con-

figuration diagnostic is generated.

The unit must be re-configured

with a valid configuration to cor-

rect this problem.

Defrosting-Compressor

Lockout

The defrost stat used with Tracer

ZN.520 on DX units is wired in se-

ries with the condensing unit.

When it opens to indicate a frost

condition, the Tracer ZN.520 sens-

es the open circuit and de-energiz-

es the condensing unit output. A

defrosting diagnostic is generated

at this point.

Entering Water

Temperature Failure

If the Tracer ZN.520 has validated

an entering water temperature in-

put and then the input becomes in-

valid, an entering water temp-

erature failure diagnostic occurs.

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Troubleshooting

Diagnostics

Table 28: Tracer™ ZN.520 Unit Controller diagnostics

Latching/non-

latching

Diagnostic

Unit Response

Reset

Fan—OFF

Valves—OPEN

Outdoor air damper—CLOSED

Face bypass damper—BYPASS

DX/electric heat—OFF

Baseboard heat—OFF

Auto reset once within 24hrs. If

safety generates a diagnostic

more than once a communi-

cated or manual reset will be

necessary.

Low Coil Temperature

Latching

Detect

Fan—OFF

Valves—CLOSED

Outdoor air damper—CLOSED

Face bypass damper—BYPASS

DX/electric heat—OFF

Baseboard heat—OFF

Low Air Flow - Fan Failure

Communicated or manual reset

Fan—OFF

Valves—CLOSED

Outdoor air damper—CLOSED

Face bypass damper—BYPASS

DX/electric heat—OFF

Baseboard heat—OFF

Space Temperature

Non-latching

Latching

2,4

Failure

Fan—ENABLED

Valves—ENABLED³

Entering Water Temp

Outdoor air damper—ENABLED³

Face bypass damper—ENABLED³

DX/electric heat—ENABLED³

Baseboard heat—OFF

Failure

Fan—OFF

Valves—OPEN

Outdoor air damper—CLOSED

Face bypass damper—BYPASS

DX/electric heat—OFF

Baseboard heat—OFF

Auto reset once within 24hrs. If

safety generates a diagnostic

more than once a communi-

cated or manual reset will be

necessary.

Discharge Air Temp Limit

Fan—OFF

Valves—CLOSED

Discharge Air Temp

Failure

Outdoor air damper—CLOSED

Face bypass damper—BYPASS

DX/electric heat—OFF

Baseboard heat—OFF

Non-latching

Communicated or manual reset

2,4

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—MINIMUM

Outdoor Air Temp Failure POSITION⁵

Non-latching

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

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Table 28: Tracer™ ZN.520 Unit Controller diagnostics

Diagnostic Unit Response

Fan—ENABLED

Latching/non-

latching

Reset

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Humidity Input Failure

Non-latching

Communicated or manual reset

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

CO₂Sensor Failure

Communicated or manual reset

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Generic AIP Failure

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—OFF

Defrosting - Cmpr Lockout

Maintenance Required

Baseboard heat—ENABLED

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/Electric Heat—ENABLED

Baseboard heat—ENABLED

Local Fan Mode Failure

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Local Setpoint Failure

Fan—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Generic Temperature

Failure

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Table 28: Tracer™ ZN.520 Unit Controller diagnostics

Diagnostic Unit Response

Fan—DISABLED

Latching/non-

latching

Reset

Valves—DISABLED

Outdoor air damper—DISABLED

Face bypass damper—DISABLED

DX/electric heat—DISABLED

Baseboard heat—DISABLED

Invalid Unit Configuration

Non-latching

Communicated or manual reset

Fans—ENABLED

Valves—ENABLED

Outdoor air damper—ENABLED

Face bypass damper—ENABLED

DX/electric heat—ENABLED

Baseboard heat—ENABLED

Normal

Communicated or manual reset

Note : The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.

Note : During manual output test, these diagnostics make the green status LED light in a two-blink pattern. For more information see,

Manual Output Test, on page 48 for more information.)

Note : When the entering water temperature is required but not present, the Tracer™ ZN.520 Unit Controller generates a diagnostic to

indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid entering water temperature value is

present (non-latching diagnostic). When the entering water temperature sensor fails, the controller prohibits all hydronic cooling operation,

but allows the delivery of heat when heating is required. In the COOL mode, all hydronic cooling is locked-out, but normal fan and outdoor

air damper operation is permitted.

Note : These diagnostics are non-latching and automatically reset when the input is present and valid.

Note : When the outdoor air temperature sensor has failed or is not present, the Tracer™ ZN.520 Unit Controller generates a diagnostic to

indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present

(non-latching diagnostic). When the outdoor air temperature sensor fails or is not present, the controller prohibits economizer operation. A

value of Enable or Disable for nviEconEnable overrides these decisions, regardless of the presence of an outdoor air temperature value or

failure.For more information see, Interoperability, on page 12 for more information.)For more information see, Data Sharing—LonWorks,

on page 46 for more information.)

Translating Multiple Diagnostics

The controller senses and records

each diagnostic independently of

other diagnostics. It is possible to

have multiple diagnostics present

simultaneously. The diagnostics

are reported in the order they oc-

cur.

q By cycling the fan switch from

agnostic occurs.

off to any speed setting

If a Low Coil Temperature Detec-

tion diagnostic recurs within 24

hours after an automatic diagnos-

tic reset, you must manually reset

the diagnostic. See other possible

methods for resetting diagnostics

in this section.

Automatically

The Tracer™ ZN.520 Unit Control-

ler includes an automatic diagnos-

tic reset function. This function

attempts to automatically recover

a unit when the Low Coil Temper-

ature Detection diagnostic occurs.

When this diagnostic occurs, the

controller responds as defined in

Table 28: Tracer™ ZN.520 Unit Controller

diagnostics.

Resetting

Diagnostics

There are many ways to reset unit

diagnostics:

Manual output test

The ^TESTbutton on the controller

may be used either during installa-

tion to verify proper end device

operation or during troubleshoot-

ing. When depressed, the Test but-

ton, the controller exercises all

outputs in a predefined sequence.

The first and last steps of the se-

quence reset the controller diag-

nostics. (See “Manual Output Test” on

page 48.for more information.)

q Automatically by the controller

After the controller detects the

Low Coil Temperature Detection

diagnostic, the unit waits 30 min-

utes before invoking the automatic

diagnostic reset function. The au-

tomatic diagnostic reset function

clears the Low Coil Temperature

Detection diagnostic and attempts

to restore the controller to normal

operation. The controller resumes

normal operation until another di-

q By initiating a manual output

test at the controller

q By cycling power to the

controller

q By using a building automation

system

Cycling power

When turned-off, the controller's

24 VAC power, and re-applies

q By using the Rover service tool

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power, the unit cycles through a

power-up sequence and clears all

timers.

tems (i.e., Tracer Summit building

automation system) can reset di-

agnostics in the Tracer™ ZN.520

unit controller. For more complete

information, refer to the product

literature for the building automa-

tion system.

Diagnostic reset

Any device that can communicate

the network variable nviRequest

(enumeration “clear_alarm”) can

reset diagnostics in the Tracer™

ZN.520 unit controller. The con-

troller also attempts to reset diag-

nostics whenever power is cycled.

By default, the controller attempts

to reset all diagnostics at power-

up. Diagnostics present at power-

up and those that occur after pow-

er-up are handled according to the

defined unit diagnostics sequenc-

es (For more information see,Table

28: Tracer™ ZN.520 Unit Controller diag-

nostics, on page 52 for more information.).

Rover service tool

Rover service tool can reset diag-

nostics in the Tracer™ ZN.520 unit

controller. For more complete in-

formation, refer to the Rover In-

stallation, Operation, and

Cycling the fan switch

If the user cycles the fan speed

switch from OFF to any speed, the

controller resets all diagnostics.

Diagnostics may recur immediate-

ly if the problem still exists.

Building automation system

Some building automation sys-

Programming manual.

Questionable unit operation

Fans

Table 29: Fan outputs do not energize

Probable cause

Possible Explanation

The wiring between the controller outputs and the fan relays and contacts must be present and correct

for normal fan operation.

Unit wiring

If the controller does not have power, the unit fan does not operate. For the Tracer™ ZN.520 Unit

Controller to operate normally, it must have an input voltage of 24 VAC. When the green LED is off

continuously, the controller does not have sufficient power or has failed.

No power to the controller

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the fans may not work correctly.

Unit configuration

After power-up, the controller always observes a random-start from 5 to 30 seconds. The controller

remains off until the random-start time expires.

Random-start observed

When power-up control wait is enabled (non-zero time), the controller remains off until one of two

conditions occurs:

Power-up control

wait

The controller exits power-up control wait once it receives communicated information.

2. The controller exits power-up control wait once the power-up control wait time expires.

A specific list of diagnostics affects fan operation. For more information see, Tracer™ ZN.520 Unit

Controller diagnostics, on page 52 for more information.)

Diagnostic present

Manual output test

Fan mode OFF

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the unit fan may not

be on. For more information see, Manual Output Test, on page 48 for more information.)

When a local fan mode switch (provided on the Trane zone sensor) determines the fan operation, the

off position controls the unit OFF.

You can communicate a desired operating mode (such as OFF, HEAT, and COOL) to the controller. When

OFF is communicated to the controller, the unit controls the fan OFF. There is no heating or cooling.

Requested mode OFF

UNOCCUPIED operation

When the controller is in the UNOCCUPIED mode, the fan is cycled.

The controller operates the fan continuously when in the OCCUPIED, OCCUPIED STANDBY, or OCCUPIED

Cycling fan operation/continuous BYPASS mode. When the controller is in the unoccupied mode, the fan is cycled between HIGH speed and

OFF with capacity.

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Valves

Table 30: Valves stay closed

Probable cause

Possible Explanation

The wiring between the controller outputs and the valve(s) must be present and correct for normal

valve operation.

Unit wiring

After power-up, the controller always observes a random-start from 5 to 30 seconds. The controller

remains off until the random-start time expires.

Random-start observed

Unit configuration

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the valves may not work correctly.

When power-up control wait is enabled (non-zero time), the controller remains off until one of two

conditions occurs:

The controller exits power-up control wait once it receives communicated information.

The controller exits power-up control wait once the power-up control wait time expires.

Power-up control

wait

A specific list of diagnostic affects valve operation. For more information see, Tracer™ ZN.520 Unit

Controller diagnostics, on page 52 for more information.)

Diagnostic present

Manual output test

Fan mode off

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the valve(s) may not

be open. For more information see, Manual Output Test, on page 48 for more information.)

When a local fan mode switch (provided on the Trane zone sensor) determines the fan operation, the

off position controls the unit off and valves to close.

You can communicate a desired operating mode (such as OFF, HEAT, and COOL) to the controller. When

OFF is communicated to the controller, the unit controls the fan OFF. There is no heating or cooling

(valves are closed).

Requested mode off

The controller includes entering water temperature sampling logic which is automatically invoked

during 2-pipe and 4-pipe changeover when the entering water temperature is either too cool or too hot

for the desired heating or cooling. For more information see, Entering Water Temperature Sampling,

on page 43 for more information.)

Example: A 2-pipe heat/cool changeover unit will not cool if the entering water temperature is too

warm for cooling or if the entering water sensor is not present. The unit will not heat if the entering

water temperature is too cool for heating. If failed the controller will close valve for one hour then

reattempt sampling routine.

Sampling logic

Table 31: Valves stay open

Probable cause

Possible Explanation

The wiring between the controller outputs and the valve(s) must be present and correct for normal

valve operation.

Unit wiring

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the valves may not work correctly.

Unit configuration

Diagnostic present

A specific list of diagnostic affects valve operation. For more information see, Tracer™ ZN.520 Unit

Controller diagnostics, on page 52 for more information.)

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the valve(s) may be

open.For more information see, Manual Output Test, on page 48 for more information.)

Manual output test

Sampling logic

The controller includes entering water temperature sampling logic which automatically invoked during

2-pipe and 4-pipe changeover when the entering water temperature is either too cool or too hot for the

desired heating or cooling. For more information see, Entering Water Temperature Sampling, on page

43 for more information.)

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Table 31: Valves stay open

Probable cause

Possible Explanation

When the fan is off with no demand for capacity (0%) and the outdoor air temperature is below the

freeze avoidance setpoint, the controller opens the water valves (100%) to prevent coil freezing. This

includes unoccupied mode when there is no call for capacity or any other time the fan is off.

Freeze avoidance

Normal operation

The controller opens and closes the valves to meet the unit capacity requirements.

DX/Electric Heat

Table 32: DX or electric output(s) does not energize

Probable cause

Possible Explanation

The wiring between the controller outputs and the end devices must be present and correct for normal

operation.

Unit wiring

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the unit may not work correctly.

Unit configuration

Diagnostic present

A specific list of diagnostics affect compressor and electric heat operation. For more information see,

Tracer™ ZN.520 Unit Controller diagnostics, on page 52 for more information.)

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the DX or electric

outputs may be OFF. For more information see, Manual Output Test, on page 48 for more information.)

Manual output test

When the fan is OFF with no demand for capacity (0%) and the outdoor air temperature is below the

freeze avoidance setpoint, the controller disables compressors and electric heat outputs. This includes

UNOCCUPIED mode when there is no call for capacity or any other time the fan is OFF.

Freeze avoidance

Normal operation

The controller energizes the outputs only as needed to meet the unit capacity requirements.

Outside Air Damper

Table 33: Outdoor air damper stays closed

Probable cause

Explanation

The wiring between the controller outputs and the outdoor air damper must be present and correct for

normal damper operation.

Unit wiring

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the damper may not work

correctly.

Unit configuration

Random-start observed

After power-up, the controller always observes a random-start from 5 to 30 seconds. The controller

remains OFF until the random-start time expires.

When power-up control wait is enabled (non-zero time), the controller remains OFF until one of two

conditions occurs:

Power-up control wait

The controller exits power-up control wait once it receives communicated information.

2. The controller exits power-up control wait once the power-up control wait time expires.

A specific list of diagnostics affects outdoor air operation. For more information see, Tracer™ ZN.520

Unit Controller diagnostics, on page 52 for more information.)

Diagnostic present

Manual output test

Fan mode OFF

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the unit damper

may not be open. For more information see, Manual Output Test, on page 48 for more information.)

When a local fan mode switch (provided on the Trane zone sensor) determines the fan operation, the

OFF position controls the unit OFF and damper to close.

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Table 33: Outdoor air damper stays closed

Probable cause

Explanation

You can communicate a desired operating mode (such as OFF, HEAT, and COOL) to the controller. When

OFF is communicated to the controller, the unit controls the fan OFF. There is no heating or cooling

(valves are closed).

Requested mode OFF

When the fan is OFF and the outdoor air temperature is below the freeze avoidance setpoint, the

controller disables economizing and keeps the outdoor air damper closed. This includes UNOCCUPIED

mode when there is no call for capacity or any other time the fan is OFF.

Freeze avoidance

When the controller is in the UNOCCUPIED mode, the outdoor air damper remains closed unless

economizing is enabled.

UNOCCUPIED mode

Warm up and cool-down

The controller includes both a morning warm up and cool-down sequence to keep the outdoor air

damper closed during the transition from UNOCCUPIED to OCCUPIED. This is an attempt to bring the

space under control as quickly as possible.

The controller opens and closes the outdoor air damper based on the controller's occupancy mode and

fan operation. Normally, the outdoor air damper is open during OCCUPIED, OCCUPIED STANDBY, and

OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the

controller is economizing. For more information see, Modulating Outdoor Air Operation, on page 43 for

more information.)

Normal operation

Table 34: Outdoor air damper stays open

Probable Cause

Explanation

The wiring between the controller outputs and the outdoor air damper must be present and correct for

normal damper operation.

Unit wiring

The controller must be properly configured based on the actual installed end devices and application.

When the unit configuration does not match the actual end devices, the damper may not work

correctly.

Unit configuration

The controller includes a manual output test sequence you can use to verify output operation and

associated output wiring. However, based on the current step in the test sequence, the unit damper

may be open. For more information see, Manual Output Test, on page 48 for more information.)

Manual output test

Normal operation

The controller opens and closes the outdoor air damper based on the controller's occupancy mode and

fan operation. Normally, the outdoor air damper is open during OCCUPIED, OCCUPIED STANDBY, and

OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the

controller is economizing. For more information see, Modulating Outdoor Air Operation, on page 43 for

more information.)

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Replacing Circuit Boards

Tracer ZN.520 Unit Controller Replacement

1. Disconnect power or disable

the circuit breaker to unit.

2. Remove bad or questionable

Tracer ZN.520 controller cir-

cuit board.

3. Install controller in the unit

with the heat-sink placement

at the top of the control box.

(See page 32).

4. Connect the power to the cir-

cuit board ONLY.

5. Connect Rover and properly

configure the controller,

unless a previously config-

ured board is purchased.

6. Power down.

7. Connect the remaining input

and output wiring to the con-

troller.

8. Reapply power.

9. Complete sequence 7 and 8

above in the installation sec-

tion of this manual.

10. Refer to BAS manual for

instructions on how to install

the new ZN.520 into BAS sys-

tem.

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Ap p e n d ix

Ha rd w ire d S e t p o in t Ad ju s t m e n t

Ta b le 3 5 : Ha rd w ire d s e t p o in t a d ju s t m e n t

Re s is t a n c e (W)

889.4

S e t p o in t (De g F)

733.6

577.9

500

422.1

344.2

266.4

188.5

110.6

Fa n S w it c h Re s is t a n c e Va lu e s

Ta b le 3 6 : Re s is t a n c e va lu e s

Re s is t a n c e (W)

S w it c h P o s it io n

16,300

10,700

2,320

High

Lo w

Au to

Off

4,870

Ha rd w ire d Th e rm is t o r Va lu e s

Ta b le 3 7 : Hardw ired 10k W therm istor values

Re s is t a n c e

87.5kW

74.6kW

63.8kW

54.6kW

46.9kW

40.4kW

34.8kW

30.2kW

26.2kW

22.8kW

20.0kW

17.5kW

15.3kW

13.5kW

11.9kW

10.5kW

Te m p e r a t u r e

0°F

Re s is t a n c e

10.0k W

9.3kW

8.2kW

7.3kW

6.5kW

5.8kW

5.2kW

4.7kW

4.2kW

3.8kW

3.4kW

3.1kW

2.8kW

2.5kW

2.3kW

2.1kW

Te m p e ra t u re

77°F

5°F

80°F

10°F

15°F

20°F

25°F

30°F

35°F

40°F

45°F

50°F

55°F

60°F

65°F

70°F

75°F

85°F

90°F

95°F

100 °F

105 °F

110 °F

115 °F

120 °F

125 °F

130 °F

135 °F

140 °F

145 °F

150 °F

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Ap p e n d ix—Bin a ry

Co n fig u ra t io n

Bin a ry Co n fig u ra t io n

Ta b le 3 8 : Bin a ry c o n fig u ra t io n d e t a ils

Bin a r y in p u t

Fu n c t io n

C o n f ig u r a t io n

De s c rip t io n

o r o u t p u t

Low tem p

detection

Closed: BIP 1 is Norm al (no diagnostic)

Open: BIP 1 is Active (diagnostic)

BI 1

BI 2

BI 3

No rm a lly clo s e d

Condensate

overflow

Closed: BIP 2 is Norm al (no diagnostic)

Open: BIP 2 is Active (diagnostic)

No rm a lly clo s e d

Norm ally open

Closed: BIP 3 is Norm al (Occupied)

Occupancy

Ope n: BIP 3 is Active (Unoccupie d)

Open: BIP 3 is Norm al (Occupied)

Closed: BIP 3 is Active (Unoccupied)

Whe n the controlle r com m a nds the fa n on a nd the bina ry input re m a ins

open for one m inute, BIP is norm al (diagnostic).

BI 4

Fa n sta tus

Norm ally open

Whe n the controlle r com m a nds the fa n on a nd the bina ry input close s,

BIP is active (no diagnostic).

When input is Open, BIP is Active (Defrost activated)

When input is Closed, BIP is Norm al (no Defrost)

De fro s t

J 1-1

Defrost

De-energized: Fan off

Energized: Fan high

Fa n high

Norm ally open

Fan

De-energized: Fan\Exhaust off

Ene rgize d: Fa n Me dium \Exhust on

J 1-2

Medium \Exhust

De-energized: Fan off

En e rg ize d : Fa n lo w

J 1-3

Fan low

Generic binary

output/base board Norm ally open

heat

TB4-1 a n d TB4-

De-energized: Output off (de-energized)

Energized: Output on (energized)

1 . The occupancy input applications vary for standalone and com m unicated instances. For m ore inform ation, see Occupancy arbitration

tables in the Appendix.

2 . The fan status device is norm ally closed during norm al fan operation. When the fan is off either from a fan failure or the controller

com m anding the fan off, the binary input device opens.

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Ap p e n d ix—Un it Op e ra t io n

Un it Op e ra t io n Ba s e d On Th e Effe c t ive HEAT/CO OL Ou t p u t

Ta b le 3 9 : Un it o p e ra t io n b a s e d o n t h e e ffe c t ive h e a t /c o o l o u t p u t

Effe c t ive h e a t / c o o l

A p p lic a t io n m o d e in p u t

(n v iA p p lic M o d e )

He a t /c o o l m o d e in p u t

(n v iHe a t C o o l)

m o d e o u t p u t

(n vo He a t Co o l)

Un it Op e ra t io n

Fa n —En a b le d

He a tin g —En a b le d

Co o lin g —En a b le d

Da m p e r—En a b le d

Au to

Determ ined by controller

Fa n —En a b le d

He a tin g —En a b le d

Cooling—Disa ble d

Da m p e r—En a b le d

Heat

Heating

Morning warm up

Cooling

Pre-cool

Off

Fa n —En a b le d

He a tin g —En a b le d

Cooling—Disa ble d

Dam per—Disabled

Mo rn in g w a rm u p

Co o lin g

Pre-cool

Off

Fa n —En a b le d

He a ting—Disa ble d

Co o lin g —En a b le d

Da m p e r—En a b le d

Fa n —En a b le d

He a ting—Disa ble d¹

Co o lin g —En a b le d

Dam per—Disabled

Au to

Fa n —Dis a b le d

He a ting—Disa ble d

Cooling—Disa ble d

Dam per—Disabled

Fa n —En a b le d

He a tin g —En a b le d

Co o lin g —En a b le d

Da m p e r—En a b le d

Te s t

Test

Fa n —En a b le d

He a ting—Disa ble d

Cooling—Disa ble d

Da m p e r—En a b le d

Fan only

No t p re s e n t

Determ ined by controller Fa n —En a b le d

He a tin g —En a b le d

Co o lin g —En a b le d

Da m p e r—En a b le d

He a t

Any state

Heating

Fa n —En a b le d

He a tin g —En a b le d

Cooling—Disa ble d

Da m p e r—En a b le d

Mo rn in g w a rm u p

Morning warm up

Fa n —En a b le d

He a tin g —En a b le d

Cooling—Disa ble d

Dam per—Disabled

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Ap p e n d ix—Un it Op e ra t io n

c o n t .

Ta b le 3 9 : Un it o p e ra t io n b a s e d o n t h e e ffe c t ive h e a t /c o o l o u t p u t

Effe c t ive h e a t / c o o l

m o d e o u t p u t

A p p lic a t io n m o d e in p u t

(n v iA p p lic M o d e )

He a t /c o o l m o d e in p u t

(n v iHe a t C o o l)

U n it O p e r a t io n

(n vo He a t Co o l)

Co o l

An y s ta te

Co o l

Fa n —En a b le d

Heating—Disabled

Co o lin g —En a b le d

Da m p e r

Pre -co o l

Pre-cool

Off

Fa n —En a b le d

Heating—Disabled

Co o lin g —En a b le d

Da m p e r—Dis a b le d

Off

Fa n —Dis a b le d

Heating—Disabled

Cooling—Disabled

Da m p e r—Dis a b le d

Test

Determ ined by controller Fa n —En a b le d

He a tin g —En a b le d

Co o lin g —En a b le d

Da m p e r—En a b le d

Fa n o n ly

Fan only

Fa n —En a b le d

Heating—Disabled

Cooling—Disabled

Da m p e r—En a b le d

1 . Use of heat for supply air tem pering and dehum idification rem ains available.

2 . Night purge, Em ergency heat, and Nul m odes are not supported by the Tracer™ ZN.520 Unit Controller. If one of these m odes is

received by the controller, it is interpreted as Auto.

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Ap p e n d ix—Da t a Lis t s

Da t a Lis t s

Table 70 provides an input/output listing for the Tracer ZN.520 unit controller. The content of the lists conform s

to both the LonMark Space Com fort Controller Functional Profile and the LonMark node object.

Table 40 Input/ output listing

In p u t

S NVT t yp e

SNVT_obj_re que st

O u t p u t

S NVT t yp e

SNVT_obj_status

nviRequest

n vo S ta tu s

n viS p a ce Te m p

n viS e tp o in t

SNVT_tem p_p

nvoFileDirectory

n vo S p a ce Te m p

nvoUnitStatus

SNVT_address

SNVT_tem p_p

nviSetptOffset

nviOccSchedule

n viOccMa n Cm d

n viOccS e n s o r

n viAp p licMo d e

n viHe a tCo o l

SNVT_tem p_p

SNVT_hva c_sta tus

SNVT_tem p_p

SNVT_tod_event

SNVT_occupancy

SNVT_hvac_m ode

SNVT_switch

n vo Effe ctS e tp t

nvoEffectOccup

nvoHeatCool

SNVT_occupancy

SNVT_hvac_m ode

SNVT_tem p_p

nvoSetpoint

n vo Dis ch AirTe m p

n vo Te rm in a lLo a d

n vo S p a ce RH

SNVT_tem p_p

n viFa n S p e e d Cm d

nviCom prEnable

nviAuxHeatEnable

nviValveOverride

n viEm e rg Ove rrid e

n viS o u rce Te m p

n viS p a ce RH

S NVT_le v_p e rce n t

SNVT_tem p_p

SNVT_switch

n vo Ou td o o rTe m p

n vo S p a ce CO2

SNVT_hvac_overid

SNVT_hvac_em erg

SNVT_tem p_p

SNVT_ppm

n vo En te rWa te rTe m p

SNVT_tem p_p

S NVT_le v_p e rce n t

1. LonMark certification pending

Table 41 Configuration properties

C o n f ig u r a t io n p r o p e r t y

n ciS n d HrtBt

S NVT t yp e

S C P T r e f e r e n c e

D e s c r ip t io n

S NVT_tim e _s e c

SNVT_tem p_setpt

S NVT_h va c_typ e

S NVT_tim e _s e c

SNVT_str_asc

S CPTm a xS e n d Tim e (49)

S CPTs e tPn ts (60)

S e n d h e a rtb e a t

n ciS e tp o in ts

Occupa ncy te m pe ra ture se tpoints

Un it typ e

nciUnitType

S CPTh va cUn itTyp e (169)

S CPTm in S e n d Tim e (52)

S CPTm a xRcvTim e (48)

SCPTlocation (17)

nciMinOutTm

n ciRcvHrtBt

Min im u m s e n d tim e

Re ce ive h e a rtb e a t

Location label

n ciLo ca tio n

n ciByp a s s Tim e

n ciS p a ce RHS e tp t

n ciOAMin Po s

SNVT_tim e_m in

SNVT_lev_percent

S CPTb yp a s s Tim e (34)

Local bypass tim e

S p a ce RH S e tp o in t

Minim um outside air position during

o ccu p ie d m o d e

Note : LonMark certification pending

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Ap p e n d ix—Tim e c lo c k

The following procedure covers:

S e t t in g t h e Tim e

Clo c k

qsetting the current tim e and

d a y

The tim e clock m u s t b e p ro -

g ra m m e d for the unit to operate

in occupied m ode (under load). If

not program m ed, the unit will run

in the unoccupied m ode. Power

m ust be supplied to the unit for the

tim e clock to be set.

qsetting the program (events)

qreviewing and changing the

program s, and

qoverriding program s

(m anually)

Hour

Minute

Automatic

Run Symbol

LED Display

elected, A M appears in the

display. Release h .

the week (1 is Monday, 7 is

Sunday).

S e t t h e Tim e a n d Da y

The tim e clock (Figure 36) is locat-

ed behind the access door on the

top right of the unit.

3. Press and hold (¹) (Run). If

daylight savings tim e is in

effect, ±1 h should appear in

the display. If not, press ±1 h

to clear.

5. Release (¹) and the colon “:”

in the display will begin flash-

ing.

1. Press Re s . (Reset) to clear the

display and any program data.

The “day” num bers (1-7) will

blink.

S e t t h e P ro g ra m

4. Still holding (¹) down, set the

current hour and m inutes by

pressing h and m respec-

Determ ine in advance how you

want the unit to operate.

2. Hold h (Hour) in and toggle

±1 h to select m ilitary or a.m ./

p.m . m ode. If a.m /p.m . is

tively. Then set the day with

the Da y key using the num ber

corresponding to the day of

For norm al occupied operation,

the unit “load” is set ON, whether

in heating or cooling. This m eans

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Ap p e n d ix—Tim e c lo c k

the unit will respond differently to

changing conditions and m aintain

a higher com fort level.

a half hour or so before the

arrival of people, so the unit

will bring the room up (or

down” to the preset occupied

tem perature setpoints).

during any day or com bination

of days (up to 20 events)

9. Note: If only one event is pro-

gram m ed, the unit will rem ain

in that load or unload condi-

tion all the tim e.

For unoccupied operation or “no

load” conditions, a lower com fort

level is provided. The load can be

switched off by using the program

for periods when the room will be

unoccupied.

6. If the program event you just

entered will be the sam e every

day (as indicated by all seven

day num bers at the top of the

display) you can press P ro g .

to lock in that event and go to

the next event. If not and the

program will vary during the

week (e.g. different program

for the weekend), don’t press

P ro g. go to the following step.

10. When all the events are pro-

gram m ed, press the (¹) (run)

key for norm al operation. The

current tim e as set will be dis-

played, along with the run

sym bol (¹).

No t e : If t h e ro o m w ill b e

u n o c c u p ie d , t h e t im e c lo c k

s h o u ld b e p ro g ra m m e d

a c c o rd in g ly t o c o n s e rve

e n e rg y. Th e p o s it io n o f t h e

o u t s id e d a m p e r c a n a llo w t o o

m u c h o u t s id e a ir in a n

u n o c c u p ie d s p a c e if t h e u n it ’s

t im e c lo c k is s e t fo r “ lo a d ” o r

o c c u p ie d m o d e a n d c a n re s u lt

in u n n e c e s s a ry u n it c yc lin g

a n d u n d e s ira b le h e a t t ra n s fe r.

Re vie w a n d Ch a n g e

P ro g ra m s

No t e : If yo u p re s s P ro g . b y

m is t a k e , s im p ly c o n t in u e t o

p re s s P ro g . u n t il t h e e ve n t

c o m e s u p in re vie w a n d m a k e

t h e c h a n g e .

To review a program and events at

any tim e, press P ro g . at any tim e.

Program s events will be displayed

in the sequence they were entered

with repeated presses of P ro g.

Re m e m b e r t h a t t h e p ro g ra m is

e a s ily c h a n g e d a n d c a n a ls o b e

o ve rrid d e n a ft e r it is in it ia lly

s e t .

7. With the tim e and hour for the

event set, select the day or

days for which the event

applies by pressing the Da y

key. Toggling the Da y key

gives you ten options for indi-

vidual days or com binations

that can be applied. Select one

and lock it in by pressing

P ro g.

To change a program , select the

event as in the previous paragraph

and alter the new data (day, hour

m inute) as desired to overwrite the

old program . Press P ro g to store

the data.

1. Press the P ro g. key. Spaces or

fields for entering tim e (hours

and m inutes) appear as dashes

separated by a colon.

To delete a program event, select

the event again and press h and m

until dashes appear in the tim e dis-

play. Press either P ro g . or ( ¹) until

the dashes flash in the display.

2. Press P ro g. again. The num -

ber of free (available) pro-

gram s is given in this case to

be “Fr2 0 ” or 20.

In the exam ple, if you only

want the unit to operate under

load for the tim e set for week-

days, you would select “1 2 3 4

5” by pressing Da y, then

select another program event

for the weekend.

To reset all program data, press

Re s .

3. Press P ro g. again to return to

the event tim e m ode.

Ove rrid e P ro g ra m

(Ma n u a l Op e ra t io n )

4. Toggle the “Load” key on (

)

1or off (O) to link the tim e with

the action.

8. Repeat the preceding steps to

set the next program event. A

“load: event is followed by an

“unload” event. For exam ple if

the unit is program m ed for a

load condition in the m orning,

you could program the unit to

unload later in the day or at

night when the room will

While in the Run m ode (¹sym bol

In the exam ple from the pre-

ceding step, you would set the

load ON.

in display), press the hand

key

to reverse the load status (e.g. if

the load was ON, it is now OFF). A

5. Enter the tim e for the first pro-

gram event.

hand sym bol

appears to indi-

cate the override is active.

At the next scheduled event, auto-

m atic (program ) control will re-

sum e elim inating the override.

For exam ple, should you want

the unit to operate under load

for an occupied period at 8:00

a.m ., enter “0 8 :00 ” A M on

the display using the h and m

keys. Better yet, enter the tim e

becom e unoccupied for a

period. If the occupied and

unoccupied periods vary

widely but predictably, you

can program a cycle of events

To switch the load perm anently

ON, press the

key a second

tim e. [ ] appears in the display.

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Ap p e n d ix—Tim e c lo c k

To switch the load perm anently

OFF, press the

key a third tim e.

[O] appears in the display.

To return to autom atic (pro-

gram m ed) operation, press the

key a fourth tim e. Run ¹ appears

in the display.

NOTE: Th e Ma in P o w e r

Dis c o n n e c t s w it c h is lo c a t e d

o n t h e lo w e r rig h t s id e o f t h e

u n it b e h in d t h e rig h t fro n t

c a b in e t p a n e l. It is o n ly u s e d

t o re m o ve p o w e r t o t h e u n it

fo r s e rvic in g .

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Ap p e n d ix—Lo c a t io n Id e n t ifie r

This area provided for the removable tag.

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Lo c a t io n Id e n t ifie r

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Literature Order Num ber

File Num ber

UV-SVP01A-EN

SV-TD-UV-000-SVP01A-EN-0700

Supersedes

New

Th e Tra n e Co m p a n y

Worldwide Applied System s Group

LaCrosse, Wisonsin

Stocking Location

La Crosse

www.trane.com

Since The Trane Com pany has a policy of continuous product im provem ent, it reserves the right to

change design and specifications without notice.

An Am erican Standard Com pany

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