Installation
Owner
Diagnostics
Split System Cooling Condensers
Model CTA 7 1/2 to 15 Tons
Models
“A” and later Design Sequence
CTA
090A***A – 60 HZ
120A***A – 60 HZ
120B***A – 60 HZ
180B***A – 60 HZ
September 2007
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Contents
4
Installation/Startup/Commissioning
Model Number Description
Unit Dimensions
4
5
Electrical Data
8
Unit Inspection
9
Initial Leak Test
9
Lifting Recommendations
Clearances
9
10
10
10
12
12
12
13
14
20
21
22
23
Unit Mounting
Refrigerant Piping
Leak Check
System Evacuation
Refrigeration Charging
Electrical Wiring
Low Voltage Wiring
Refrigeration Schematic
Installation Checklist
Sequence of Operation
Maintenance
Warranty
25
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Model Number
Description
Model Number Description
Split System Condensing Model Nomenclature
All products are identified by a multi-
ple-character model number that pre-
cisely identifies a particular type of
unit. An explanation of the alphanu-
meric identification code is provided
below. Its use will enable the owner/
operator, installing contractors, and
service engineers to define the opera-
tion, specific components, and other
options for any specific unit.
C T A 0 9 0 A 1
0 0
A
A
1 2
3
4 5 6
7
8
9
10
11
12
Digits 1,2,3 - Product Type
CTA = Remote Air-Cooled Condenser
Digits 8 - Electrical
Characteristics
1 = 208-230/60/1
2 = 460/60/1
Digits 4,5,6 - Nominal Gross
Cooling Capacity (MBh)
090 = 090 MBh-used with
3 & 5T SCRH
120 = 120 MBh - used with
7.5 & 10T SCRH
8 = 575/60/1
Digits 9,10 - Factory Installed
Options
00 = Packed Stock
0A = Coated Coil
When ordering replacement parts or
requesting service, be sure to refer to
the specific model number, serial
number, and DL number (if applica-
ble) stamped on the unit nameplate.
180 = 180 MBh - used with
12 & 15T SCRH
Digits 11 - Minor Design Sequence
A = First
Digits 7 - Major Development
Sequence
A = 1 Refrig Cir.(3, 5, 7.5T SCRH)
B = 2 Refrig Cir. (10, 12, 15T SCRH)
Digits 12 - Service Digit
A = First
4
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Unit
Dimensions
Figure 1 — CTA090A
Figure 2 — CTA120A
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Unit
Dimensions
Figure 3 — CTA120B
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Unit
Dimensions
Figure 4 — CTA180B
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Electrical
Data
Table 1: CTA Unit Electrical Data
Basic Unit Characteristics
Outdoor Fan Motor
Allowable
Voltage
Range
Minimum
Circuit
Ampacity
Maximum
Fuse
Model
Number
Electrical
Characteristics
Amps
FLA
Amps
LRA
Qty.
HP
Size
CTA090A1
CTA090A2
CTA090A8
CTA120A1
CTA120A2
CTA120A8
CTA120B1
CTA120B2
CTA120B8
CTA180B1
CTA180B2
CTA180B8
208-230/60/1
460/60/1
187-254
414-506
518-632
187-254
414-506
518-632
187-254
414-506
518-632
187-254
414-506
518-632
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
1
1
1
1
1
1
1
1
1
2
2
2
1/2
1/2
1/2
1
3.1
1.6
1.2
6.0
2.7
2.0
6.0
2.7
2.0
3.1
1.6
1.2
8.1
3.7
3.0
17.0
7. 0
575/60/1
208-230/60/1
460/60/1
1
575/60/1
1
5.7
17.0
7. 0
208-230/60/1
460/60/1
1
1
575/60/1
1
5.7
8.1
3.7
3.0
208-230/60/1
460/60/1
1/2
1/2
1/2
575/60/1
8
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Installation
Installation procedures should be per-
formed in the sequence that they
appear in this manual. Do not destroy
or remove the manual from the unit.
The manual should remain weather-
protected with the unit until all instal-
lation procedures are complete.
be compatible with electrical charac-
teristics specified on component
nameplates. Replace damaged parts
with authorized parts only.
Lifting Recommendations
Before preparing the unit for lifting,
estimate the approximate center of
gravity for lifting safety. Because of
placement of internal components,
the unit weight may be unevenly dis-
tributed. Approximate unit weights
are given in Table 2.
Inspection Checklist
To protect against loss due to damage
incurred in transit, complete the fol-
lowing checklist upon receipt of the
unit.
Note: It is not the intention of this
manual to cover all possible varia-
tions in systems that may occur or to
provide comprehensive information
concerning every possible contin-
gency that may be encountered dur-
ing an installation. If additional
information is required or if specific
problems arise that are not fully dis-
cussed in this manual, contact your
local Sales office.
Table 2: Unit and corner weights (lbs)
Corner Weights
Ship Net
Max. Max.
Model
[ ] Inspect individual pieces of the
shipment before accepting the unit.
Check for obvious damage to the
unit or packing material.
#1 #2 #3 #4
CTA090A 254 210 59 63 39 49
CTA120A
325 281 62 85 57 77
CTA120B
CTA180B 532 447 100 105 124 118
[ ] Inspect the unit for concealed dam-
age before it is stored and as soon
as possible after delivery. Con-
cealed damage must be reported
within 15 days. If concealed dam-
age is discovered, stop unpacking
the shipment. Do not remove dam-
aged material from the receiving
location. Take photos of the dam-
age if possible. The owner must
provide reasonable evidence that
the damage did not occur after
delivery.
WARNING
Heavy Objects!
Note: “Warnings” and “Cautions”
appear at appropriate
places in this manual. Your personal
safety and the proper
operation of this machine require that
you follow them carefully. The Com-
pany assumes no liability for installa-
tions or servicing performed by
unqualified personnel.
Do not use cables (chains or
slings) except as shown. Each of
the cables (chains or slings) used
to lift the unit must be capable of
supporting the entire weight of
the unit. Lifting cables (chains or
slings) may not be of the same
length. Adjust as necessary for
even unit lift. Other lifting
arrangements may cause equip-
ment or property-only damage.
Failure to properly lift unit could
result in death or serious injury.
See details below.
Installation Checklist
[ ] Notify the carrier’s terminal of dam-
age immediately by phone and by
mail. Request an immediate joint
inspection of the damage by the
carrier and the consignee.
An “Installation Checklist” is provided
at the end of the installation section of
this manual. Use the checklist to verify
that all necessary installation proce-
dures have been completed. Do not
use the checklist as a substitute for
reading the information contained in
the manual. Read the entire manual
before beginning installation proce-
dures.
The crated unit can be moved using a
forklift of suitable capacity. For lifting
the unit, attach lifting straps or slings
securely to the lifting holes at each
corner. Use spreader bars to protect
the unit casing from damage. Test lift
the unit to determine proper balance
and stability.
[ ] Notify the sales representative and
arrange for repair. Do not repair the
unit until the damage is inspected
by the carrier’s representative.
Initial Leak Test
Unit Inspection
All CTA units are shipped with a hold-
ing charge of nitrogen in each circuit.
Remove the service access panel(s)
shown in Figures 1 to 4. Locate the
discharge or liquid line gauge ports
for each circuit. Install gauges to
determine if the circuits are still pres-
surized. If not, the charge has
escaped. Repair as required to obtain
a leak-free circuit.
Inspect material carefully for any ship-
ping damage. If damaged, it must be
reported to, and claims made against
the transportation company. Compare
the information that
appears on the unit nameplate with
ordering and submittal
data to insure the proper unit was
shipped. Available power supply must
CAUTION
Equipment Damage!
Use spreader bars to prevent lift-
ing straps from damaging the
unit. Install bars between lifting
straps. Failure to properly lift unit
may result in crushing unit cabi-
net or damaging unit finish.
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Installation
Clearances
Figure 5 Roof Mounted Unit
Holes must be made in the structure
to run refrigerant lines. For the major-
ity of ground-level installations, the
holes can be made in the header that
rests on top of the foundation. Alter-
natively, these holes may also be
made in the foundation itself. On roof-
mounted units, refrigerant lines
Provide enough space around the unit
to allow unrestricted access to all ser-
vice points. Refer to Figure 1 through
Figure 4 for unit dimensions and mini-
mum required service and free air
clearances. Observe the following
points to insure proper unit operation.
should enter the building as close to
the unit as possible; preferably within
three to four inches of the refrigerant
connection on the unit, plus a six-inch
(long radius) 90 degree "L" entering
the building (See Figure 5).
A. Do not install the unit under a low
overhang. Condenser discharge must
not be restricted. See Notes in Figure
1 through Figure 4.
NOTICE: Do not obstruct condenser
discharge air. This can result in warm
air recirculation through the coil.
Refrigerant Piping Guidelines
A. Maximum recommended line
lengths: (per circuit)
Maximum linear length..............200 Ft.
(w/o accumulator)
B. Do not locate the unit in a position
where runoff water can fall into the
fan discharge openings.
Maximum discharge line lift......200 Ft.
Maximum liquid line lift..............60 Ft.
WARNING
C. Condenser intake air is supplied
from three or four sides of the unit.
Adhere to the minimum required
clearances given in Figure 1 through
Figure 4.
Structural Failure!
Ensure that the roof structure
supports are strong enough to
support the weight of the unit
and any accessories. Failure to do
this could result in death or seri-
ous injury due to structural fail-
ure and could seriously damage
the unit and the building.
B. Maximum allowable pressure
drops (R-410A):
Discharge line...............................10 psi
Liquid line (without subcooler)...50 psi
Unit Mounting
Route refrigerant piping for minimum
linear length, minimum number of
bends and fittings (no reducers) and
minimum amount of line exposed to
outdoor ambients.
Rooftop Mounting: If the unit will be
roof mounted, determine for certain
that the structure is strong enough to
support the unit and any required
accessories. Unit weights are given in
Table 2. The unit should be elevated
on a level, field fabricated four-inch
steel or wood 4" x 4" mounting frame.
Complete the frame and secure it into
position before lifting the unit to the
roof. The mounting frame must sup-
port a minimum of three of the unit’s
four sides and should span roof sup-
ports to distribute the load on the
roof.
Ground Level Mounting
“For ground level installation, the unit
base should be adequately supported
and hold the unit near level. The
installation must meet the guidelines
set forth in local codes.” The support
should extend two inches beyond the
unit base channels at all points. The
unit and support must be isolated
from any adjacent structure to prevent
possible noise or vibration problems.
Any ground level location must com-
ply with required clearances given in
Figure 1 through Figure 4.
C. Recommended line sizes:
CTA090, 120A (single circuit)
CTA120B, 180B (dual circuit)
Discharge line - 7/8 inch sealed type L
refrigerant tubing.
Liquid line - 1/2 inch sealed type L
refrigerant tubing.
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Installation
Note: Insulate all refrigerant piping
and connections.
4. Unbraze the tube seal caps to reveal
the line braze connections.
above the maximum recom-
mended unit test pressure as
specified in applicable unit litera-
ture. Failure to properly regulate
pressure could result in a violent
explosion, which could result in
death or serious injury or equip-
ment or property-only-damage.
Refrigerant Piping Procedures
(Outdoor Units)
Each CTA unit ships with a holding
charge of dry nitrogen. The nitrogen
should be removed and the entire sys-
tem evacuated (at the proper time) to
avoid possible contamination.
WARNING:
Hazardous Pressures!
Coil has a nitrogen holding
charge. Do not remove seal caps
by heating the caps while coil is
under pressure. Depress the
gauge port valve cores to gradu-
ally relieve nitrogen holding
charge. Remove valve cores
before removing the tubing seal
caps. Failure to properly relieve
pressure could result in death or
serious injury.
CAUTION:
Equipment Damage!
1. Remove the service access panel.
Wet-wrap all valves and protect
painted surfaces from excessive
heat. Heat can damage system
components and the unit finish.
2. Locate the liquid and discharge
lines. Check that the piping connec-
tion stubs on the valves (Figure 6)
line up properly with the holes in
the unit cabinet.
6. Shut off nitrogen supply.
7. Shut off the manifold valve for the
line that is connected to the dis-
charge line gauge port.
CAUTION:
Figure 6
Equipment Damage!
Do not remove the seal caps from
refrigerant connections until pre-
pared to braze refrigerant lines to
the connections. Excessive expo-
sure to atmosphere may allow
moisture or dirt to contaminate
the system, damaging valve seals
and causing ice formation in sys-
tem components.
Figure 7
5. Cut, fit and braze tubing, starting at
the outdoor unit and work toward
the indoor unit.
Note: Use long radius bells for all 90
degree bends.
All brazing should be done using a 2
to 3 psig dry nitrogen purge flowing
through the pipe being brazed (Figure
6).
Refrigerant Piping Procedure
(Indoor Unit)
3. Locate the gauge ports on the dis-
charge and liquid lines. Depress the
valve core to release the nitrogen
from the unit.
Once liquid and discharge lines are
complete to the refrigerant connec-
tions on the indoor unit, depress the
gauge port valve cores on the suction
and discharge lines to gradually
relieve nitrogen holding charge.
WARNING:
Note: If nitrogen is not released from
the unit, there is a leak in the system.
Locate the leak and repair before pro-
ceeding with the installation.
Hazardous Pressures!
When using dry nitrogen cylin-
ders for pressurizing units for
leak testing, always provide a
pressure regulator on the cylinder
to prevent excessively high unit
pressures. Never pressurize unit
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Installation
for repairs. Mixtures of refriger-
ants and air under pressure may
become combustible in the pres-
ence of an ignition source leading
to an explosion. Excessive heat
from soldering, brazing or weld-
ing with refrigerant vapors
present can form highly toxic
gases and extremely corrosive
acids. Failure to follow all proper
safe refrigerant handling prac-
tices could result in death or seri-
ous injury.
4. Evacuate the system to hold a 350
micron vacuum.
WARNING:
5. Close off the valve to the vacuum
pump and observe the micron
gauge. If gauge pressure rises
above 500 microns in one (1)
minute, evacuation is incomplete or
the system has a leak.
Hazardous Pressures!
Coil has a nitrogen holding
charge. Do not remove seal caps
by heating the caps while coil is
under pressure. Depress the
gauge port valve cores to gradu-
ally relieve nitrogen holding
charge. Remove valve cores
before removing the tubing seal
caps. Failure to properly relieve
pressure could result in death or
serious injury.
6. If vacuum gauge does not rise
above 500 microns in one (1)
minute, the evacuation should be
complete.
7. With vacuum pump and micron
gauge blanked off, open the valve
on R-410A cylinder and allow refrig-
erant pressure to build up to 100
psig.
3. Braze the liquid line connections.
4. Open the gauge port on the dis-
charge line and then braze the dis-
charge line to the connection stub.
Nitrogen will bleed out the open
gauge port on the discharge line.
1. Remove both seal caps from the
indoor unit connection stubs.
8. Close valve on the R-410A supply
cylinder. Close valves on the mani-
fold gauge. Set and remove the
refrigerant charging hoses from the
discharge and suction gauge ports.
CAUTION:
Equipment Damage!
5. Shut off nitrogen supply.
Do not remove the seal caps from
refrigerant connections until pre-
pared to braze refrigerant lines to
the connections. Excessive expo-
sure to atmosphere may allow
moisture or dirt to contaminate
the system, damaging valve seals
and causing ice formation in sys-
tem components.
Leak Check
After the brazing operation of the out-
door and indoor refrigerant lines is
complete, check the field brazed con-
nections for leaks. Pressurize the sys-
tem through the gauge port with dry
nitrogen to 200 psi. Use soap bubbles
or other leak-checking methods to
ensure that all field joints are leak
free. If not, release pressure, repair
and repeat the leak test.
9. Leak test the entire system. Using
proper procedures and caution,
repair any leaks found and repeat
the leak test.
Refrigerant Charging Procedure
If charging by weight, refer to refriger-
ant charges that are provided in Table
3. If additional refrigerant is needed
because of length of line, calculate the
requirements using Table 4. Charge
by weight through the gauge port on
the suction line in the indoor unit.
When charging is complete, replace
the cap on the gauge port.
2. Turn nitrogen supply on. Nitrogen
enters through liquid line gauge
port.
System Evacuation
1. After completion of leak check,
replace suction, liquid and dis-
charge valve cores, and evacuate
the system.
WARNING:
Hazard of Explosion and Deadly
Gases!
Never solder, braze or weld on
refrigerant lines or any unit com-
ponents that are above atmo-
spheric pressure or where
refrigerant may be present.
Always remove refrigerant by fol-
lowing the guidelines estab-
lished by the EPA Federal Clean
Air Act or other state or local
codes as appropriate. After refrig-
erant removal, use dry nitrogen to
bring system back to atmospheric
pressure before opening system
2. Attach appropriate hoses from the
manifold gauge to suction and dis-
charge line gauge ports.
Insulating and Isolating
Refrigerant Lines
Insulate the entire discharge line with
refrigerant piping insulation. Also
insulate any portion of the liquid line
exposed to temperature extremes.
Insulate and isolate liquid and dis-
charge lines from each other. Isolate
refrigerant lines from the structure
and any ductwork.
Note: Unnecessary switching of hoses
can be avoided and complete evacua-
tion of lines leading to a sealed sys-
tem can be accomplished with
manifold center hose and connecting
branch hose to cylinder of R-410A and
vacuum pump.
Note: To prevent possible noise or
vibration, be certain to isolate refriger-
ant lines from the building.
3. Attach center hose of manifold
gauges to the vacuum pump.
12
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Installation
Table 3: CTA Refrigerant Charge
Electrical Wiring
CTA field wiring consists of providing
power supply to the unit, installing the
system indoor thermostat and provid-
ing low voltage system interconnect-
ing wiring. Access to electrical
connection locations is shown in Fig-
ures 1 through 4.
Refrigerant Charge
Model
(R-410A)*
WARNING:
CTA090A
w/SCRH030
Hazardous Energy Sources!
Use extreme caution while servic-
ing the unit when the control box
access panel is removed and
power is applied to the unit. Fail-
ure to observe all safety precau-
tions could result in death or
serious injury.
18.1 lbs
CTA090A
w/SCRH050
19.9 lbs
20.8 lbs
CTA120A
w/SCRH075
Unit Power Supply
The installer must provide line voltage
circuit(s) to the unit main power termi-
nals as shown by the unit wiring dia-
grams in Figures 9 and 10 on page 15.
Power supply must include a discon-
nect switch in a location convenient to
the unit. Ground the unit according to
local codes and provide flexible con-
duit if codes require and/or if vibration
transmission may cause noise prob-
lems.
CTA120B
11.9 lbs
w/SCRH100
(Ckt. #1 & #2)
CTA180B
w/SCRH120
16.8 lbs. (Ckt. #1)
16.0 lbs. (Ckt. #2)
2. Turn on power to the unit. Allow the
system to run for five to ten minutes
to stabilize operating conditions.
CTA180B
w/SCRH150
17.5 lbs. (Ckt. #1)
16.9 lbs. (Ckt. #2)
* Sufficient operating charge for listed unit
and 33 feet of nominally sized refrigerant
piping.
3. Measure airflow across the indoor
coil. Compare the measurements
with the fan performance data in the
Data/Submittal.
Table 4: Additional Refrigerant
Tubing Sizes
Additional
Tubing
Length
CAUTION:
Additional
Refrig.
4. Check suction line superheat and
condenser sub-cooling to ensure
the unit is operating properly.
Use Copper Conductors Only!
Unit terminals are not designed to
accept other types of conductors.
Failure to use copper conductors
may result in equipment damage.
Discharge Liquid
7/8"
7/8"
7/8"
7/8"
1/2"
1/2"
1/2"
1/2"
15 ft.
25 ft.
32 ft.
40 ft.
1.3 lbs
2.2 lbs
2.8 lbs
3.5 lbs
5. Disconnect all power to the unit.
CAUTION:
Note: Amounts shown are based on 0.087
lbs of refrigerant per foot of 7/8" and 1/2"
lines.
All wiring must comply with appli-
cable local and national NEC
codes. Type and location of dis-
connect switches must comply
with all applicable codes.
WARNING:
Hazardous Voltage
Note: For tubing over 40 feet, calculate
the additional refrigerant needed,
based on notes above.
w/Capacitors!
Disconnect all electrical power,
including remote disconnects and
discharge all motor start/run ca-
pacitors before servicing. Follow
proper lockout/tagout procedures
to ensure the power cannot be in-
advertently energized. Verify with
an appropriate voltmeter that all
capacitors have discharged. Fail-
ure to diconnect power and dis-
charge capacitors before
Gaseous Charging
WARNING:
This procedure is accomplished with
the unit operating. Electrical connec-
tions must be complete. Do not pro-
ceed until the system is ready to
operate.
Ground Wire!
All field-installed wiring must be
completed by qualified personnel.
All field-installed wiring must
comply with NEC and applicable
local codes. Failure to follow this
instruction could result in death
or serious injuries.
Procedure
1. Connect R-410A drum with gauge
manifold to the gauge ports (pres-
sure taps) on the compressor dis-
charge and suction lines (Figure 7).
servicing could result in death or
serious injury.
Note: For additional information
regarding the safe discharge of
capacitors, see PROD-SVB06A-EN
or PROD-SVB06A-FR.
WARNING:
Note: On the CTA units, the service
access panel must be installed when
the unit is running and being charged.
Grounding Required!
Follow proper local and state elec-
trical code on requirements for
grounding. Failure to follow code
could result in death or serious in-
jury
6. Remove the charging system from
the unit and replace all access pan-
els.
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Wiring
Low Voltage
WARNING:
Hazardous Voltage w/Capacitors!
Disconnect all electrical power,
including remote disconnects and
discharge all motor start/run ca-
pacitors before servicing. Follow
proper lockout/tagout procedures
to ensure the power cannot be in-
advertently energized. Verify with
an appropriate voltmeter that all
capacitors have discharged. Fail-
ure to diconnect power and dis-
charge capacitors before
servicing could result in death or
serious injury.
Note: For additional information
regarding the safe discharge of
capacitors, see PROD-SVB06A-EN
or PROD-SVB06A-FR.
Figure 8: Typical Field Wiring
Note:
CTA180B/S(C,I)RH120
CTA180B/S(C,I)RH150
Field Wiring:
A — 2 power wires. Line voltage for
single phase
B — 3 power wires. Line voltage for
3 phase
C — Cooling only thermostat: 4 wires,
24 volts.
1. Wiring shown with dashed lines is to
be furnished and installed by the cus-
tomer. All customer supplied wiring
must be copper only and must con-
form to NEC and local electrical codes.
Codes may require line of sight be-
tween disconnect switch and unit.
Determine proper wire sizes and unit
protective fusing requirements by
referring to the unit nameplate. Field
wiring diagrams for accessories
are shipped with the accessory.
CTA090A/S(C,I)RH030
CTA090A/S(C,I)RH050
CTA120A/S(C,I)RH075
CTA120B/S(C,I)RH100
Field Wiring:
D — 3 control wires, 24 volts.
A — 2 power wires. Line voltage for
single phase
B — 3 power wires. Line voltage for
3 phase; 2 wires for single phase
C — Cooling only thermostat: 3 wires,
24 volts.
— Digital thermostat: add 1 addi-
tional wire, 24 volts.
D — 2 control wires, 24 volts.
14
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Field Wiring
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Wiring
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Wiring
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Wiring
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Wiring
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Refrigeration
Diagram
Figure 11: Typical Split System Cooling Diagram
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System
Pre-Start Procedure
Installation Checklist
Electrical Wiring
Complete this checklist once the unit
is installed to verify that all recom-
mended procedures have been
accomplished before starting the sys-
tem. Do not operate the system until
all items covered by this checklist are
complete.
WARNING:
Hazardous Voltage
w/Capacitors!
Disconnect all electrical power,
including remote disconnects and
discharge all motor start/run ca-
pacitors before servicing. Follow
proper lockout/tagout procedures
to ensure the power cannot be in-
advertently energized. Verify with
an appropriate voltmeter that all
capacitors have discharged. Fail-
ure to diconnect power and dis-
charge capacitors before
[ ] Inspect unit location for proper
required service clearances.
[ ] Inspect unit location for proper free
air clearances.
[ ] Inspect unit location for secure,
level mounting position.
servicing could result in death or
serious injury.
Refrigerant Piping
[ ] Performed initial leak test?
Note: For additional information
regarding the safe discharge of
capacitors, see PROD-SVB06A-
EN or PROD-SVB06A-FR.
[ ] Connected properly sized and con-
structed liquid and discharge lines
to the connection stubs at both the
indoor and outdoor units?
[ ] Provided unit power wiring (with
disconnect) to proper terminals in
the unit control section?
[ ] Insulated the entire discharge line?
[ ] Insulated portions of liquid line
exposed to extremes in tempera-
ture?
[ ] Installed system indoor thermo-
stat?
[ ] Installed system low voltage inter-
connecting wiring to proper termi-
nals of outdoor unit, indoor unit
and system thermostat?
[ ] Evacuated each refrigerant circuit
to 350 microns?
[ ] Charged each circuit with proper
amount of R-410A?
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System
Pre-Start Procedure
Unit Start-Up
Once the unit is properly installed and
pre-start procedures
are complete, start the unit by turning
the System Switch on the indoor ther-
mostat to either HEAT, COOL or AUTO.
The system should operate normally.
Cooling Mode
When the room thermostat system
switch is positioned at COOL and the
fan switch is at AUTO, the condenser
fan relay energizes on a call for cool-
ing. When the contacts of the con-
denser fan relay close, operation of
the condenser fan begins. The evapo-
rator fan contactor also energizes on a
call for cooling and initiates evapora-
tor fan operation.
Sequence of Operation
General
Operation of the system cooling (and
optional heating) cycles is controlled
by the position of the system switch
on the room thermostat. Once the
system switch is placed in either the
HEAT or COOL position, unit opera-
tion is automatic. The optional auto-
matic changeover thermostat, when
in the AUTO position, automatically
changes to heat or cool with sufficient
room temperature change.
On units with dual circuits, the second
stage of cooling is initiated as a result
of the 2-stage thermostat calling for
additional cooling.
Evaporator Fan (Indoor Supply
Air)
The evaporator fan is controlled by an
ON/AUTO switch on the room ther-
mostat. With the switch positioned at
AUTO and the system operating in
the cooling mode, fan operation coin-
cides with the cooling run cycles. If
the system is equipped with heat and
is operating in the heating mode
while the fan switch is at AUTO, fan
operation coincides with the heating
run cycles. When the fan switch is
positioned at ON, fan operation is
continuous.
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Maintenance
Maintenance
Perform all of the indicated mainte-
nance procedures at the
intervals scheduled. This will prolong
the life of the unit and reduce the pos-
sibility of costly equipment failure.
ing mode, check the suction and dis-
charge pressures. Record these
readings on the “Maintenance
Log.”
WARNING:
Hazardous Service Procedures!
The maintenance and trouble-
shooting procedures recommend-
ed in this section of the manual
could result in exposure to electri-
cal, mechanical or other potential
safety hazards. Always refer to
the safety warnings provided
throughout this manual concern-
ing these procedures. When possi-
ble, disconnect all electrical
power including remote discon-
nects before servicing. Follow
proper lockout/tagout procedures
to ensure the power can not be in-
advertently energized. When nec-
essary to work with live electrical
components, have a qualified li-
censed electrician or other indi-
vidual who has been trained in
handling live electrical compo-
nents perform these tasks. Failure
to follow all of the recommended
safety warnings provided, could
result in death or serious injury.
7. Observe indoor fan operation and
correct any unusual or excessive vi-
bration. Clean blower wheels as
needed.
Monthly
Conduct the following maintenance
inspections once per month.
Annually (Cooling Season)
The following maintenance proce-
dures must be performed at the begin-
ning of each cooling season to insure
efficient unit operation.
WARNING:
Hazardous Voltage w/Capacitors!
Disconnect all electrical power,
including remote disconnects and
discharge all motor start/run ca-
pacitors before servicing. Follow
proper lockout/tagout procedures
to ensure the power cannot be in-
advertently energized. Verify with
an appropriate voltmeter that all
capacitors have discharged. Fail-
ure to diconnect power and dis-
charge capacitors before
1. Perform all of the monthly mainte-
nance inspections.
2. With the unit operating, check unit
superheat and record the reading in
the Maintenance Log.
3. Remove any accumulation of dust
and/or dirt from the unit casing.
servicing could result in death or
serious injury.
4. Remove corrosion from any surface
and repaint. Check the gasket
Note: For additional information
regarding the safe discharge of
capacitors, see PROD-SVB06A-EN
or PROD-SVB06A-FR.
around the control panel door to in-
sure it fits correctly and is in good
condition to prevent water leakage.
5. Inspect the evaporator fan belt. If it
is worn or frayed, replace it.
1. Inspect air filters and clean if neces-
sary.
6. Inspect the control panel wiring to
insure that all connections are tight
and that the insulation is intact.
2. Check unit wiring to ensure all con-
nections are tight and that the wir-
ing insulation is intact.
7. Check refrigerant piping and fittings
for leaks.
3. Check drain pans and condensate
piping to insure they are free of ob-
stacles.
4. Manually rotate the indoor fan to in-
sure proper operation.
5. Inspect the evaporator and con-
denser coils for dirt and debris. If the
coils appear dirty, clean them.
6. With the unit operating in the cool-
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Maintenance
Maintenance Log
Evaporator Entering Air
Dry Bulb Wet Bulb
Compressor
Superheat
Subcooling
Ambient
Temp.
F
Date
Suction
Discharge
Pressure
Circuit #1 (F)
Circuit #1 (F)
Pressure
Note: Perform each inspection once per month (during cooling season) while unit is operating.
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Warranty
CTA
Warranty Information
Standard Warranty
The standard split system cooling condenser warranty is Trane’s parts-
only warranty, running 12-months from startup, not to exceed 18-
months from shipment.
Extended Warranty
The optional extended warranty is a second through fifth year warranty.
The time starts at the end of standard 1-year coverage through the fifth
year.
These extended warranties apply only to new equipment installed in do-
mestic Trane Commercial Systems Group sales territories and must be
ordered prior to start-up.
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Literature Order Number
Date
PKG-SVX17A-EN
September 2007
Supersedes
SS-SVN11A-EN October 2004
Trane
A business of American Standard Companies
Trane has a policy of continuous product and product data improvement and reserves the right to
change design and specifications without notice.
For more information, contact your local Trane
office or e-mail us at [email protected]
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