INSTALLATIONAND
MAINTENANCE INSTRUCTIONS
(2,4)SH13 Series
Self-Contained Heat Pump
WARNING
Improper installation, adjustment, alteration, service, or maintenance can cause injury or
property damage. Refer to this manual. For assistance or additional information, consult a
qualified installer or service agency.
WARNING
WARNING
Installation and servicing of air conditioning
equipment can be hazardous due to internal
refrigerant pressure and live electrical compo-
nents. Only trained and qualified service
personnel should install or service this equip-
ment. Installation and service performed by
unqualified persons can result in property
damage, personal injury, or death.
Sharp metal edges can cause injury. When
installing the unit, use care to avoid sharp
edges.
TABLE OF CONTENTS
INSTALLATION ...................................... 2
OPERATION .......................................... 7
MAINTENANCE................................... 10
WIRING DIAGRAM .............................. 11
WARRANTY ........................................ 12
WARNING
If this unit is to be installed in a mobile or manu-
factured home application, the ductwork must
be sized to achieve static pressures within the
manufacturer’s guidelines. All other installation
guidelines must also be followed. Failure to do
so may result in equipment damage, personal
injury, and improper performance of the unit.
Manufactured By
A.A.C.
A Lennox International Inc. Company
421 Monroe Street
*48369K005*
Bellevue, OH 44811
CAUTION
The installation of this appliance must conform to the requirements of the National Fire Protection Association;
the National Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States; the Canadian Electrical
Code Part 1, CSA 22.1 (latest edition) in Canada; and any state or provincial laws or local ordinances. Local
authorities having jurisdiction should be consulted before installation is made. Such applicable regulations or
requirements take precedence over the general instructions in this manual.
Save these instructions for future reference
# 48369K005
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Minimum Clearance Requirements
Using Accessory Lift Kit
To
For
Proper
Operation
For
Service
Combustible
Material
Lifting Bracket
Accessory
Sheet Metal
Spreaders
(Field Supplied)
Screw
Front
Rear
0"
0"
0"
0"
0"
48"
24"
24"
30"
36"
3"
3"
To avoid possible
damage to unit
panels from lifting
clevis, place
packing material
between clevis
and panels before
lifting unit.
Condenser
End
3"
Blower
End
0"
Top
36"
Figure 1
Roof Curb Installation
Table 1
If a roof curb is used, follow the manufacturer’s Installation
Instructions and be sure that all required clearances are
observed (see following Clearances section).
Condensate Drain
The SH package unit is equipped with a 3/4" FPT cou-
pling for condensate line connection. Plumbing must
conform to local codes. Use a sealing compound on male
pipe threads.
Roof Curb Assembly
The condensate drain line must be properly trapped
and routed to a suitable drain. See Figure 3 for proper
drain arrangement.The drain line must pitch to an open
drain or pump to prevent clogging of the line. Seal around
the drain connection with suitable material to prevent air
leakage into the return air system.
Figure 2
Typical Condensate Drain Connection
Clearances
All units require certain clearances for proper operation and
service. Refer to Table 1 for the minimum clearances to
combustibles as well as minimum clearances necessary
for servicing and proper unit operation.
Unit
Drain Connection
1.00" Min.
In the U.S., units may be installed on combustible floors
made from wood or class A, B, or C roof covering material.
In Canada, units may be installed on combustible floors.
3.00" Min.
12.00"
Max.
Service Access
Positive Liquid Seal Required
Access to all serviceable components is provided by four
removable panels:filter compartment, blower compart-
ment, heater compartment, and top panel.
Figure 3
# 48369K005
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Ductwork
Filters
Ductwork should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors of
America (ACCA).
Air filters are to be used with this heating/cooling unit.
Filters are not factory supplied in the unit. However, a filter
frame accessory is available from the manufacturer that
allows filters to be installed within the unit. If the filter
frame accessory is not used, a filter must be installed in
the duct work by the installer. Filters must always be
installed ahead of the evaporator coil and must be kept
clean or replaced. Dirty filters will reduce the airflow of the
unit. Filters should be sized in accordance with Table 2.
A closed return duct system shall be used.This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
at the unit be made with flexible joints.
The supply and return air duct systems should be de-
signed for the CFM and static requirements of the job.
They should not be sized by matching the dimensions
of the duct connections on the unit.
Minimum Required Surface Area
for Disposable Filters
Outdoor ductwork must be insulated and waterproofed.
Filter Area
Nominal Cooling
(sq. ft.)
Equipment is shipped for side ductwork connection.The
unit can be converted to bottom ductwork connection by
removing the duct covers located over the bottom duct
openings and placing these covers over the side duct
openings (see Figure 4).
24,000
30,000
36,000
42,000
48,000
60,000
2.67
3.33
4.00
4.67
5.33
6.67
To remove the bottom duct cover over supply opening:
1. Remove screw on cover nearest side opening.
2. Lift end of cover slightly and push to slide back screw/
pin free from duct flange.
3. Slide duct cover out the side duct opening.
Table 2
Removing Bottom Duct Covers
Electrical Wiring
2
WARNING
1
Line voltage is present at all components when
unit is not in operation on units with single pole
contactors. Disconnect all remote electric
power supplies before opening access panel.
Unit may have multiple power supplies. Failure
to disconnect all power supplies could result in
personal injury or death.
1. Remove screw and lift.
2. Slide cover to free back pin.
Base
Figure 4
All wiring should be done in accordance with the
National Electrical Code, ANSI/NFPA No. 70 (latest
edition); Canadian Electrical Code Part 1, CSA C22.1
(latest edition); or local codes where they prevail. Use
wiring with a temperature limitation of 75°C minimum. Run
the 208 or 230 volt, 60 hertz electric power supply through
a fused disconnect switch to the connection box of the unit
and connect as shown in the wiring diagram located on the
inside of the control access panel.
CAUTION
When fastening ductwork to side duct flanges
on unit, insert screws through duct flanges
only; do not insert screws through casing. If
using bottom duct work, do not use screws to
secure ductwork to bottom duct opening
under drain pan side. Using screws to secure
bottom duct may damage drain pan.
Page 4
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CAUTION
Electrical Access
When connecting electrical power and control
wiring to the unit, waterproof type connectors
must be used so that water or moisture cannot
be drawn into the unit during normal operation.
Heater Power Entry
Thermostat
Entry
Power supply to the unit must be N.E.C. Class 1, and must
comply with all applicable codes. A fused disconnect switch
should be field provided for the unit.The switch must be
separate from all other circuits.
Line Voltage
Entry
Figure 5
WARNING
If any of the wire supplied with the unit must be replaced,
replacement wire must be of the type shown on the wiring
diagram. Electrical wiring must be sized to carry minimum
circuit ampacity marked on the unit. Use copper conduc-
tors only. Each unit must be wired with a separate branch
circuit and be properly fused.
Unit must be grounded in accordance with
national and local codes. Failure to ground unit
properly can result in personal injury or death.
Typical Wiring Connections
THERMOSTAT
R
OUTDOOR UNIT
R
THERMOSTAT
R
OUTDOOR UNIT
R
ECONOMIZER
BLUE
WHITE
C
Y
C
Y
O
C
C
Y1
ECONOMIZER
NOT
INSTALLED
YELLOW
ORANGE
O
W
G
Y
W1
W2
O
W
G
O
W1
W2
G
CAUTION
CAUTION
GREEN
BLACK
C
G
C
Do not connect
connections except when
required by the indoor thermostat. Refer to the
thermostat installation instructions.
Do not connect
connections except when
required by the indoor thermostat. Refer to the
thermostat installation instructions.
Y2
L3
L2
L1
L2
L1
GROUND
SCREW
GROUND
SCREW
POWER WIRING
208/230-1-60
(90°C MIN. WIRE)
POWER WIRING
200/230-3-60, 460/575-3-60
(90°C MIN. WIRE)
POWER WIRING
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
24V CONTROL WIRING
(NEC CLASS 2)
* W1, W2 CAN BE USED TO STAGE ELECTRIC
* W1, W2 CAN BE USED TO STAGE ELECTRIC
HEAT ACCESSORY ON 15, 20 & 25 KW MODELS.
* 5 & 10 KW HEATER ACCESSORY FUNCTION OFF
W1 ONLY.
HEAT ACCESSORY ON 15, 20 & 25 KW MODELS.
* 10 KW HEATER ACCESSORY FUNCTION OFF
W1 ONLY.
TYPICAL WIRING CONNECTION
1 PHASE
TYPICAL WIRING CONNECTION
3 PHASE
Figure 6
# 48369K005
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Thermostat
Heater Kit Accessory Installation
The room thermostat should be located on an inside wall
where it will not be subject to drafts, sun exposure, or heat
from electrical fixtures or appliances. Follow the
manufacturer’s instructions enclosed with thermostat for
general installation procedure. Color-coded insulated wires
(#18 AWG) should be used to connect thermostat to unit.
Four wires are required for cooling.
Heater
Blockoff
Heater
Compressor
Compartment
Access
Units are shipped with compressor mountings factory-
adjusted and ready for operation. Caution: Do not loosen
compressor mounting bolts.
Panel
Heater Kit
Heater Kit Accessory (if used)
The unit is fully equipped for cooling operation without
auxiliary heat. A heater kit accessory may also be used.
Figure 7
age or restriction, leakage, corrosion, or other deficien-
cies which could cause an unsafe condition.
To install the heater kit accessory (see Figure 7):
3. Insofar as is practical, close all building doors and
windows between the space in which the appliances
remaining connected to the common venting system
are located and other spaces in the building.Turn on
clothes dryers and any appliance not connected to the
common venting system. Turn on exhaust fans, such
as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
1. Disconnect the power and remove the heater compart-
ment access panel.
2. Disconnect the plug separating the high voltage wire
harness. Remove the high voltage wire harness plug
and discard.
3. Remove the heater blockoff by removing the four
screws holding it in place.
4. Following the lighting instructions, place the unit being
inspected in operation. Adjust the thermostat so the
appliance will operate continuously.
4. Insert the heater into the control panel and fasten in
the same mounting holes.
5. Plug the heater wiring harness into the wire harness on
the control assembly. Field wiring of the auxiliary
heater is separate from the unit power supply.Wire the
power supply wiring for the heater to the appropriate
connections on the heater kit.
5. Test for spillage at the draft control relief opening after
5 minutes of main burner operation. Use the flame of a
match or candle.
6. Follow the preceding steps for each appliance con-
nected to the common venting system.
6. Replace the heater compartment access panel and
reconnect the power.
7. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers, and
any other fuel burning appliance to their previous
condition of use.
Removal of Unit from Common Venting System
When an existing furnace is removed from a common venting
system serving other appliances, the venting system is likely
to be too large to properly vent the remaining attached
appliances.The following test should be conducted with each
appliance while the other appliances connected to the
common venting system are not in operation.
8. If improper venting is observed during any of the
above tests, the common venting system must be
corrected. See National Fuel Gas Code, ANSI
Z223.1 (latest edition) or CAN/CGA B149.1 & .2
Canadian Installation Codes to correct improper
operation of common venting system.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no block-
Page 6
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Defrost Thermostat
OPERATION
Sequence of Operation
The defrost thermostat is located on the liquid line between
the check/expansion valve and the distributor.When the
defrost thermostat senses 42°F or cooler, the thermostat
contacts close and send a signal to the defrost control
board to start the defrost timing. It also terminates defrost
when the liquid line warms up to 70°F.
Cooling
When the thermostat is in the cooling mode, the O circuit is
powered which energizes the reversing valve. Upon cooling
demand, the thermostat closes circuit R andY. Closing R
andY closes the unit contactor, starting the compressor and
outdoor fan.The thermostat automatically closes R to G
circuit which also brings on the indoor blower at the same
time. Upon satisfying cooling demand, the thermostat will
open the above circuits and open the main contactor,
stopping the compressor and outdoor fan. If the unit is
equipped with a delay timer, the blower will continue to
operate for 90 seconds which improves system efficiency.
Defrost Control
The defrost control board includes the combined functions of
time/temperature defrost control, defrost relay, diagnostic LEDs
and terminal strip for field wiring connections (see Figure 8).
The control provides automatic switching from normal
heating operation to defrost mode and back. During the
compressor cycle (call for defrost), the control accumu-
lates compressor run time at 30, 60, 90 minute field-
adjustable intervals. If the defrost thermostat is closed
when the selected compressor run time interval ends, the
defrost relay is energized and the defrost begins.
Heating
Upon heating demand, the thermostat closes circuit R toY,
which closes the unit contactor, starting the compressor and
outdoor fan.The reversing valve is not energized in the heating
mode.The thermostat again automatically brings on the indoor
fan at the same time. Upon satisfying heating demand, the
thermostat opens above circuits and stops unit operation.
Defrost Control Timing Pins
Each timing pin selection provides a different accumulated
compressor run time period during one thermostat run
cycle. This time period must occur before a defrost cycle
is initiated.The defrost interval can be adjusted to 30 (T1),
60 (T2), or 90 (T3) minutes.The defrost timing jumper is
factory installed to provide a 60-minute defrost interval. If
Defrost System
The defrost system includes two components: the defrost
thermostat and the defrost control.
Defrost Control Board
P1
30
60
90
FAN
Defrost Interval
C2
Timing Pins
K1 Relay
TEST
Test Pins
DS1
DS2
Diagnostic LEDs
P5
U2
K2 Relay
U1
Compressor Delay Pins
O-OUT
Reversing Valve
P2
W1
C
L
Low Pressure Switch
LO-PS
24V
24V TerminalStrip
Connections
(optional)
L
DF
R
Defrost Thermostat
C5
O
Y1-OUT
Y1
K3 Relay
HI-PS
P6
Y1
TST PS DF
C
R
O
High Pressure Switch
(optional)
Figure 8
# 48369K005
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the timing selector jumper is not in place, the control
defaults to a 90-minute defrost interval.The maximum
defrost period is 14 minutes and cannot be adjusted.
•
•
During the 90-second start-up period
For the first 90 seconds each time the reversing
valve switches heat/cool modes
A test option is provided for troubleshooting.The test mode
may be started any time the unit is in the heating mode and
the defrost thermostat is closed or jumpered. If the jumper is
in the TEST position at power up, the control will ignore the
test pins.When the jumper is placed across the TEST pins
for 2 seconds, the control will enter the defrost mode. If the
jumper is removed before an additional 5-second period has
elapsed (7 seconds total), the unit will remain in defrost
mode until the defrost thermostat opens or 14 minutes have
passed. If the jumper is not removed until after the addi-
tional 5-second period has elapsed, the defrost will termi-
nate and the test option will not function again until the
jumper is removed and reapplied.
If the TEST pins are jumpered and the 5-minute delay
is being bypassed, the LO PS terminal signal is not
ignored during the 90-second start-up period.
Diagnostic LEDs
The defrost board uses two LEDs for diagnostics.The LEDs
flash a specific sequence according to the condition as
shown in Table 3.
Defrost Control Board
Diagnostic LEDs
Compressor Delay
Green LED
(DS2)
Red LED
(DS1)
The defrost board has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode.The compressor will be
cycled off for 30 seconds going in and out of the defrost
mode when the compressor delay jumper is removed.
Mode
No Power
to Board
Off
Off
NOTE:The 30-second “off” cycle is not functional when
jumpering theTEST pins.
Normal Operation/
Power to Board
Simultaneous Slow Flash
Alternating Slow Flash
Time Delay
Anti-Short Cycle
Lockout
The timed-off delay is 5 minutes long.The delay helps to
protect the compressor from short cycling in case the
power to the unit is interrupted or a pressure switch opens.
The delay is bypassed by placing the timer select jumper
across the TEST pins for 0.5 seconds.
Low Pressure
Switch Fault
Off
Off
Slow Flash
Low Pressure
Switch Lockout
On
Off
Off
Pressure Switch Circuit
High Pressure
Switch Fault
Slow Flash
On
The defrost control includes LO-PS terminals to connect
an optional low pressure (loss of charge pressure) switch.
A high pressure switch (optional) can be connected to the
HI PS terminals (see Figure 8 on page 7).
High Pressure
Switch Lockout
During a single demand cycle, the defrost control will lock
out the unit after the fifth time that the circuit is interrupted
by any pressure switch wired to the control board. In
addition, the diagnostic LEDs will indicate a locked-out
pressure switch after the fifth occurrence of an open pressure
switch (see Table 3).The unit will remain locked out until
power to the board is interrupted, then re-established, or until
the jumper is applied to the TEST pins for 0.5 seconds.
Table 3
Circulating Air Blower
The circulating air blower is controlled by a timing circuit in the
blower control.Timings are not adjustable.
NOTE:The defrost control board ignores input from the low
pressure switch terminals as follows:
There is no blower “on” delay after a call for heating or
cooling. Blower “off” delay is 90 seconds after the thermo-
stat is satisfied.
•
•
During theTEST mode
During the defrost cycle
Page 8
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Cooling System Performance
For maximum performance of the cooling system, operat-
ing temperatures and pressure should be checked.
Subcooling should be determined at Standard ARI test
conditions of 82°F outdoor and 80°F indoor dry bulb/67°F
wet bulb. If subcooling measured deviates from values
found inTable 4, refrigerant charge should be adjusted
accordingly for maximum performance.
Liquid Subcooling
Liquid Subcooling
@ ARI Conditions
82° OD - 80° IDDB/67° IDWB
Size
R22
410A
24
30
10°
8°
9°
11°
11°
7°
36
10°
5°
42, 48
60
10°
10°
Table 4
# 48369K005
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MAINTENANCE
WARNING
Owner Record
Model # _________________________________
Serial # _________________________________
Installation Date ___________________________
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly
could result in dangerous operation, serious
injury, death, or property damage.
Installed by:
Dealer __________________________________
Address _________________________________
Telephone # ______________________________
License # ________________________________
Improper servicing could result in dangerous
operation, serious injury, death, or property
damage.
• Before servicing, disconnect all electrical
power to unit.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
Periodic inspection and maintenance normally consists of
changing or cleaning the filters and cleaning the outdoor coil.
On occasion, other components may also require cleaning.
Filters
Filters should be checked at least every 6 weeks. Dispos-
able filters should be replaced when dirty, and cleanable
filters should be cleaned regularly. It is important to keep
the air filters clean, as dirty filters can restrict airflow and
the blower motor depends upon sufficient air flowing
across and through it to keep from overheating.
Motors
Indoor and outdoor fan and vent motors are permanently
lubricated and require no maintenance.
Outdoor Coil
Dirt and debris should not be allowed to accumulate on the
outdoor coil surface or other parts in the air circuit. Clean-
ing should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean the coil, be sure the power
to unit is shut off prior to cleaning. Care should be used
when cleaning the coil so that the coil fins are not
damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Page 10
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W H T
S1
S
B L U
B L U
K1
A51
B L U
B L U
R E D
X F M R - R
X F M R - C
Y
2 4 V
B L U
Y E L
T1
2 4 0 V
2 0 8 V
B L K
T R A N S F O R M E R
B3
W H T
B L K
B L K
GNOTCDISPLA
B
B L K
T
C21
Y E L
K1-2
R E D
K1-
B L K
B1
BLOWSPEDCHAR
Wiring Diagram
P/N 48349-001
# 48369K005
Page 11
Figure 9
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Limited Warranty
August 1, 1997
This warranty gives you specific legal rights and you may have other rights
which vary from state/province to state/province.
Subject to the limitations stated in this warranty, we warrant to the first buyer for use the residential heating, cooling, or heat pump unit,
when installed, operated, and maintained as required by this warranty, to be free of defects in workmanship or material for a period of
5 years in residential installations (1 year in non-residential installations) from the time of installation. We will replace any defective
component without cost or expense to you except for the costs of delivery and labor for removal and replacement of the defective
component.
These (2/4)SH13 package heat pump units carry a 5-year limited warranty on the compressor. Limited warranties apply
to the original owner in private owner-occupied residences.
Warranty Begins
The warranty period begins when the installation is complete and the product is ready to operate. You must be able to verify this date
whenever a warranty claim is made. Original bill of sale, installer’s invoice, or other similar document will suffice. If the beginning date
cannot be verified, we will consider warranty coverage to begin 6 months after the date the product was shipped from our factory.
Limitations on Implied Warranties
Implied warranties of merchantability or, to the extent applicable, fitness for a particular purpose are limited to 5 years, the same duration
as the basic limited written warranty provided herein. Some states/provinces do not allow limitations on how long an implied warranty of
merchantability or fitness lasts, so the above limitations or exclusions may not apply to you.
Only Warranty
This written Limited Warranty is the only warranty made by the warrantor; this warranty is in lieu of and excludes all other warranties,
express or implied. The warrantor does not authorize any person to provide any other warranty or to assume for it any further
obligation in connection with the warranted product.
What is NOT Covered
1. Cabinets or cabinet pieces.
2. Normal maintenance items such as filters, fan belts, fuses, or other consumable items.
3. Damage caused by misuse, failure to maintain properly, accidents, or acts of God.
4. External wiring, piping, venting, or attachment of accessory products not integral to our product, including without limitation,
humidifier, air cleaner, vent damper, thermostat, or other mechanical devices not manufactured by the warrantor.
5. Products that have been operated in a corrosive atmosphere where a concentration of acids, halogenated hydrocarbons,
or other corrosive elements causes deterioration to metal surfaces or integral components. NOTE: Operation in a corrosive
atmosphere is considered abuse and voids this warranty.
6. Products that have NOT been installed in accordance with our published installation instructions, applicable local, state/
provincial, or national codes, ACCA published standards.
7. Products that have NOT been installed by competent, qualified installers.
8. Products that have been moved from their original place of installation.
Warranty on Replacement Components
Any replacement component furnished by us will assume the remaining (unused) portion of the Limited Warranty.
Consequential Damages
The warrantor shall not be responsible for any consequential damages caused by any defect in the product. Some state/provinces do
not allow the exclusion or limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
This product must be installed, used, and cared for in accordance with the instruction manual. You are responsible for required periodic
maintenance or service, such as changing or cleaning of air filters and lubrication or cleaning of components. Failure to properly install,
operate, or maintain your unit voids this warranty.
Page 12
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