International comfort products PAN324 User manual

Printed in U.S.A.
519 01 1701 01 01--28--08
PACKAGED AIR CONDITIONERS
Installation Instructions
PAN3 Series
Single Phase
International Comfort Products, LLC
Lewisburg, TN. 37091
TABLE OF CONTENTS
Page
SAFE INSTALLATION REQUIREMENTS 2........
INTRODUCTION 2.............................
RECEIVING AND INSTALLATION 2...............
Check Equipment 2.............................
Provide Unit Support 2..........................
Provide Clearances 3...........................
Field Fabricate Ductwork 3.......................
Rig and Place Unit 3 -- 4.........................
Dimensions 5 -- 6...............................
Filter Data and Corner Weights 7.................
Connect Condensate Drain 8.....................
Install Duct Connections 8.......................
Install Electrical Connections 9 --10...............
PRE--START--UP 11............................
START--UP 11..................................
Check for Refrigerant Leaks 11...................
Start--Up Adjustments 11........................
Wiring Diagrams 12.............................
Checking and Adjusting Refrigerant Charge 13.....
Indoor Airflow and Airflow Adjustment 13...........
Cooling Sequence of Operation 13................
Cooling Charging Chart 14.......................
Wet Coil Air Delivery 14..........................
MAINTENANCE 15.............................
Air Filter 16....................................
Indoor Blower and Motor 16......................
Outdoor & Indoor Coil, & Condensate Drain Pan 16.
Outdoor Fan 16.................................
Electrical Controls and Wiring 17..................
Indoor Airflow 17................................
Metering Devices--Fixed Orifice 17................
TROUBLESHOOTING 18........................
START--UP CHECKLIST 19......................

2
SAFE INSTALLATION REQUIREMENTS
FIGURE 1 PAN3 AIR CONDITIONING UNIT
Installation and servicing of this equipment can be
hazardous due to mechanical and electrical components.
Only trained and qualified personnel should install, repair,
or service this equipment.
Untrained personnel can perform basic maintenance
functions such as cleaning and replacing air filters. All other
operations must be performed by trained service
personnel. When working on this equipment, observe
precautions in the literature, on tags, and on labels attached
to or shipped with the unit and other safety precautions that
may apply.
Follow all safety codes. Installation must be in compliance
with local and national building codes. Wear safety glasses,
protective clothing, and work gloves. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions included in literature and attached to
the unit.
Recognize safety information. This is the safety--alert
symbol . When you see this symbol in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER,WARNING,
CAUTION, and NOTE. These words are used with the
safety--alert symbol. DANGER identifies the most serious
hazards which will result in serious injury or death.
WARNING signifies a hazard which could result in serious
injury or death. CAUTION is used to identify unsafe
practices which may result in minor personal injury or
product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation,
reliability, or operation.
These instructions cover minimum requirements and
conform to existing national standards and safety codes. In
some instances, these instructions exceed certain local
codes and ordinances, especially those that may not have
kept up with changing residential construction practices.
We require these instructions as a minimum for a safe
installation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, turn off power
supply to the unit and install lockout tag. There may be
more than one disconnect switch. Turn off accessory
heater power switch if applicable.
!WARNING
INTRODUCTION
The PAN3 packaged air conditioner is fully self--contained
and designed for outdoor installation (see Fig. 1). See Fig. 3
and 4 for unit dimensions. All unit sizes have discharge
openings for both horizontal and downflow configurations
and are factory shipped with all downflow duct openings
covered. The unit may be installed either on a rooftop or at
ground level.
RECEIVING AND INSTALLATION
Step 1—Check Equipment
IDENTIFY UNIT
The unit model number and serial number are stamped on
the unit information plate. Check this information against
shipping papers.
INSPECT SHIPMENT
Inspect for shipping damage while unit is still on shipping
pallet. If unit appears to be damaged or is torn loose from
its anchorage, have it examined by transportation
inspectors before removal. Forward claim papers directly to
transportation company. Manufacturer is not responsible
for any damage incurred in transit. Check all items against
shipping list. Immediately notify the nearest equipment
distribution office if any item is missing. To prevent loss or
damage, leave all parts in original packages until
installation.
Step 2—Provide Unit Support
For hurricane tie downs, contact distributor for details and
PE (Professional Engineering) Certificate if required.
ROOFCURB
Install accessory roof curb in accordance with instructions
shipped with curb. Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a water tight seal. Install gasketing material
supplied with the roof curb. Improperly applied gasketing
also can result in air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6mm). This is
necessary for unit drain to function properly. Refer to
accessory roof curb installation instructions for additional
information as required.
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a
minimum of 4 in. (102mm) thick with 2 in. (51mm) above
grade (See Fig. 2). The slab should extend approximately
!

3
2 in. beyond the casing on all 4 sides of the unit. Do not
secure the unit to the slab except when required by local
codes.
OPTIONAL
RETURN
AIR
OPENING
OPTIONAL
SUPPLY
AIR
OPENING
EVAP. COIL COND. COIL
2"
FIGURE 2 Slab Mounting Details
ADDITIONAL GROUND LEVEL PLATFORM
REQUIREMENTS
The unit MUST be situated to provide safe access for
servicing.
The unit must be level and supported above grade by
beams, platform, or a pad.
Platform or pad can be of open or solid construction but
should be of permanent materials such as concrete, bricks,
blocks, steel, or pressure--treated timbers approved for
ground contact. Soil conditions must be considered so that
the platform or pad does not shift or settle and leave the unit
partially supported.
Position platform separate from building foundation.
Install in well--drained area, with top surface of platform
above grade level.
Platform must be high enough to allow for proper
condensate trap installation and drainage.
Step 3—Provide Clearances
The required minimum service clearances are shown in Fig.
3 and 4. Adequate ventilation and outdoor air must be
provided. The outdoor fan draws air through the outdoor coil
and discharges it through the top fan grille. Be sure that the
fan discharge does not recirculate to the outdoor coil. Do not
locate the unit in either a corner or under an overhead
obstruction. The minimum clearance under a partial
overhang (such as a normal house overhang) is 48 in.
(1219mm) above the unit top. The maximum horizontal
extension of a partial overhang must not exceed 48
in.(1219mm).
IMPORTANT: Do not restrict outdoor airflow. An air
restriction at either the outdoor--air inlet or the fan discharge
may be detrimental to compressor life.
Do not place the unit where water, ice, or snow from an
overhang or roof will damage or flood the unit. Do not install
the unit on carpeting or other combustible materials.
Slab--mounted units should be at least 4 in. (102mm) above
the highest expected water and runoff levels. Do not use
unit if it has been under water.
Step 4—Field Fabricate Ductwork
Secure all ducts to roof curb and building structure on
vertical discharge units. Do not connect ductwork to unit.
For horizontal applications, unit is provided with flanges on
the horizontal openings. All ductwork should be secured to
the flanges. Insulate and weatherproof all external
ductwork, joints, and roof openings with counter flashing
and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should
be ducted through the roof deck to comply with applicable
fire codes.
A minimum clearance is not required around ductwork.
Cabinet return--air static shall not exceed --.25 in. wc.
Step 5—Rig and Place Unit
Rigging and handling of this equipment can be hazardous
for many reasons due to the installation location (roofs,
elevated structures, etc.).
Only trained, qualified crane operators and ground support
staff should handle and install this equipment.
When working with this equipment, observe precautions in
the literature, on tags, stickers, and labels attached to the
equipment, and any other safety precautions that might
apply.
Training for operators of the lifting equipment should
include, but not be limited to, the following:
1. Application of the lifter to the load, and adjustment of
the lifts to adapt to various sizes or kinds of loads.
2. Instruction in any special operation or precaution.
3. Condition of the load as it relates to operation of the
lifting kit, such as balance, temperature, etc.
Follow all applicable safety codes. Wear safety shoes and
work gloves.
INSPECTION
Prior to initial use, and at monthly intervals, all rigging
brackets and straps should be visually inspected for any
damage, evidence of wear, structural deformation, or
cracks. Particular attention should be paid to excessive
wear at hoist hooking points and load support areas.
Brackets or straps showing any kind of wear in these areas
must not be used and should be discarded.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off
main power to system. There may be more than one
disconnect switch. Turn off accessory heater power
switch if applicable. Tag disconnect switch with a suitable
warning label.
!WARNING
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Never stand beneath rigged units or lift over people.
!WARNING

4
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Rigging brackets for one unit use only. When
removing a unit at the end of its useful life, use a new set
of brackets.
!WARNING
USE OF RIGGING BRACKET
NOTE: Rigging brackets are factory installed on 3--phase
units only. Single--Phase units require accessory kit
NPLIFTBK003A10.
Field Installation of Rigging Bracket (if not already installed)
1. Remove unit from shipping carton. Leave top shipping
skid on the unit for use as a spreader bar to prevent the
rigging straps from damaging the unit. If the skid is not
available, use a spreader bar of sufficient length to
protect the unit from damage.
2. Remove 4 screws in unit corner posts.
3. Attach each of the 4 metal rigging brackets under the
panel rain lip (See Fig. 5). Use the screws removed in
step 2 above to secure the brackets to the unit.
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Rigging bracket MUST be under the rain lip to provide
adequate lifting.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Do not strip screws when re--securing the unit. If a screw
is stripped, replace the stripped one with a larger diameter
screw (included). When straps are taut, the clevis should
be a minimum of 36 (914mm) inches above the unit top
cover.
!WARNING
Rigging/Lifting of Unit
1. Bend top of brackets down approximately 30 degrees
from the corner posts.
2. Attach straps of equal length to the rigging brackets at
opposite ends of the unit. Be sure straps are rated to
hold the weight of the unit (See Fig. 5).
3. Attach a clevis of sufficient strength in the middle of the
straps. Adjust the clevis location to ensure unit is lifted
level with the ground.
4. After unit is securely in place detach rigging straps.
Remove corner posts screws, and rigging brackets
then reinstall screws.
After the unit is placed on the roof curb or mounting pad,
remove the top crating.

5
FIGURE 3 PAN324--36 DIMENSIONS
R E Q U I R E D C L E A R A N C E F O R O P E R A T I O N A ND S E R V I C I N G
INCHES [mm]
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................42.00 [1066.8]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .......................................................................................48.00 [1219.2]
SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]
DUCT PANEL .................................................................................12.00 [304.8]
*
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
R E Q U I R E D C L E A R A N C E T O C O M B U S T I B L E M A TL .
INCHES [mm]
TOP OF UNIT...................................................................................14.00 [355.6]
DUCT SIDE OF UNIT.........................................................................2.00 [50.8]
SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]
BOTTOM OF UNIT .............................................................................0.50 [12.7]
N E C . R E Q U I R E D C L E A R A N C E S .
INCHES [mm]
BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.0]
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]
( R e f e r t o M a x i m u m O p e r a t i ng C l ea r a n c e s )
*Minimum distances: if unit is placed less than 304.8 (12.00) from wall
system, then systerm performance may be compromised.
UNIT ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT UNIT
HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
lb kg X Y Z
PAN324 208/230--1--60 318 144 37 [940] 20.0 [508] 17.0 [431] 17.6 [447]
PAN330 208/230--1--60 330 150 39 [991] 20.0 [508] 19.3 [490] 13.0 [330]
PAN336 208/230--1--60 339 152 41 [1042] 21.0 [533] 21.0 [533] 16.6 [422]

6
FIGURE 4 PAN342--60 DIMENSIONS
R E Q U I R E D C L E A R A N C E F O R O P E R A T I O N A ND S E R V I C I N G
INCHES [mm]
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................42.00 [1066.8]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .......................................................................................48.00 [1219.2]
SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]
DUCT PANEL .................................................................................12.00 [304.8]
*
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
R E Q U I R E D C L E A R A N C E T O C O M B U S T I B L E M A TL .
INCHES [mm]
TOP OF UNIT...................................................................................14.00 [355.6]
DUCT SIDE OF UNIT.........................................................................2.00 [50.8]
SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]
BOTTOM OF UNIT .............................................................................0.50 [12.7]
N E C . R E Q U I R E D C L E A R A N C E S .
INCHES [mm]
BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.0]
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00
[
1066.8
]
( R e f e r t o M a x i m u m O p e r a t i ng C l ea r a n c e s )
*Minimum distances: if unit is placed less than 304.8 (12.00) from wall
system, then systerm performance may be compromised.
UNIT ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT UNIT
HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
lb kg X Y Z
PAN342 208/230--1--60 412 187 40.98 [1041] 21.0 [533] 21.0 [533] 17.1 [434]
PAN348 208/230--1--60 442 201 46.98 [1193] 21.0 [533] 20.0 [508] 17.4 [442]
PAN360 208/230--1--60 446 202 46.98 [1193] 21.0 [533] 20.0 [508] 17.6 [447]

7
Table 1—Filter Data -- PAN324--60
UNIT SIZE 024 030 036 042 048 060
RETURN--AIR FILTERS, IN. (MM)* 20x20x1
(508X508X25) 20x30x1 (610x762x25) 24x36x1 (610x914x25)
Throwaway
*Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow
or the heating airflow velocity of 300 ft/minute for throwaway type. For permanent filters, follow filter manufacturer’s
recommendations for filter size based on allowable face velocity. Air filter pressure drop for non--standard filters must not exceed
0.08 in. wc.
Table 2—Minimum Airflow for Safe Electric Heater Operation (Cfm)
SIZE 024 030 036 042 048 060
Cfm 800 1000 1200 1400 1600 1750
FIGURE 5 Unit Corner Weight (lbs) and Rigging
12
43
Rigging Brackets are factory installed on
3---phase units only. Single ---phase units
require accessory kit NPLIFTBK003A10
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)
Unit 024 030 036 Unit 042 048 060
lb kg lb kg lb kg lb kg lb kg lb kg
Unit Only
Weight 318 144 330 150 335 152 Unit Only Weight 412 187 442 200 446 202
Corner
Weight 1 60 27 69 31 72 33 Corner Weight 1 74 34 88 40 88 40
Corner
Weight 2 42 19 50 23 41 19 Corner Weight 2 56 25 59 27 61 28
Corner
Weight 3 80 36 71 32 80 36 Corner Weight 3 107 49 110 50 112 51
Corner
Weight 4 136 62 140 64 142 64 Corner Weight 4 175 79 185 84 185 84
Rigging
Weight 328 149 340 154 345 156 Rigging Weight 427 194 457 207 461 209
Shipping
Weight 358 162 370 368 375 170 Shipping Weight 472 214 502 228 506 230

8
Step 6—Connect Condensate Drain
NOTE: When installing condensate drain connection be
sure to comply with local codes and restrictions.
The PAN3 disposes of condensate water through a 3/4 in.
NPT fitting which exits through the base on the evaporator
coil access side. See Fig. 3 & 4 for location.
Condensate water can be drained directly onto the roof in
rooftop installations (where permitted) or onto a gravel
apron in ground level installations. Install a field--supplied
2--in. condensate trap at the end of condensate connection
to ensure proper drainage. Make sure that the outlet of the
trap is at least 1 in. lower than the drain--pan condensate
connection to prevent the pan from overflowing (See Fig. 6).
Prime the trap with water. When using a gravel apron, make
sure it slopes away from the unit.
Connect a drain tube using a minimum of 3/4--in. PVC or
3/4--in. copper pipe (all field--supplied) at the outlet end of
the 2--in. (51mm) trap. Do not undersize the tube. Pitch the
drain tube downward at a slope of at least 1--in. (25mm) for
every 10 ft (3048mm) of horizontal run. Be sure to check the
drain tube for leaks.
FIGURE 6 Condensate Drain
TRAP
OUTLET
2" min.
1" min.
Step 7—Select and Install Duct Connections
The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation
of non--residence type air conditioning and ventilating
systems, NFPA 90A or residence type, NFPA 90B and/or
local codes and ordinances.
Select and size ductwork, supply--air registers, and return
air grilles according to ASHRAE (American Society of
Heating, Refrigeration, and Air Conditioning Engineers)
recommendations. The unit has duct flanges on the supply--
and return--air openings on the side of the unit.
When designing and installing ductwork, consider the
following:
1. All units should have field--supplied filters or accessory
filter rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
2. Avoid abrupt duct size increases and reductions.
Abrupt change in duct size adversely affects air
performance.
IMPORTANT: Use flexible transitions between ductwork
and unit to prevent transmission of vibration. Use suitable
gaskets to ensure weather tight and airtight seal. When
electric heat is installed, use fireproof canvas (or similar
heat resistant material) connector between ductwork and
unit discharge connection. If flexible duct is used, insert a
sheet metal sleeve inside duct. Heat resistant duct
connector (or sheet metal sleeve) must extend 24--in. from
electric heater element.
3. Size ductwork for cooling air quantity (cfm). The
minimum air quantity for proper electric heater
operation is listed in Table 2. Heater limit switches may
trip at air quantities below those recommended.
4. Seal, insulate, and weatherproof all external ductwork.
Seal, insulate and cover with a vapor barrier all
ductwork passing through conditioned spaces. Follow
latest Sheet Metal and Air Conditioning Contractors
National Association (SMACNA) and Air Conditioning
Contractors Association (ACCA) minimum installation
standards for residential heating and air conditioning
systems.
5. Secure all ducts to building structure. Flash,
weatherproof, and vibration--isolate duct openings in
wall or roof according to good construction practices.
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, turn off the power
supply to the unit and install lockout tag. There may be
more than one disconnect switch.
!WARNING
1. Open all electrical disconnects before starting any
service work.
2. Remove return duct cover located on duct panel by
breaking four (4) connecting tabs with screwdriver and
ahammer(seeFig.7&8).
3. To remove supply duct cover, break front and right side
connecting tabs with a screwdriver and a hammer.
Push louver down to break rear and left side tabs (see
Fig. 7 & 8).
4. If unit ductwork is to be attached to vertical opening
flanges on the unit base (jackstand applications only),
do so at this time. Collect ALL screws that were
removed. Do not leave screws on rooftop, as
permanent damage to the roof may occur.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property
damage.
Collect ALL screws that were removed. Do not leave
screws on rooftop as permanent damage to the roof
may occur.
CAUTION
!
5. It is recommended that the base insulation around the
perimeter of the vertical return--air opening be secured
to the base with aluminum tape. Applicable local codes
may require aluminum tape to prevent exposed
fiberglass.
6. Cover both horizontal duct openings with the provided
duct covers. Ensure opening is air and water tight.
7. After completing unit conversion, perform all safety
checks and power up unit.

9
NOTE: The design and installation of the duct system must
be in accordance with the standards of the NFPA for
installation of nonresidence--type air conditioning and
ventilating systems, NFPA 90A or residence--type, NFPA
90B; and/or local codes and ordinances.
FIGURE 7 Supply and Return Duct Opening
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
VENT HOOD
SHIPPING
LOCATION
FIGURE 8 Vertical Duct Cover Removed
DUCT COVERS REMOVED
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for horizontal duct installation (by
removing duct covers).
2. Select and size ductwork, supply--air registers, and
return--air grilles according to American Society of
Heating, Refrigeration and Air Conditioning Engineers
(ASHRAE) recommendations.
3. Use flexible transition between rigid ductwork and unit
to prevent transmission of vibration. The transition may
be screwed or bolted to duct flanges. Use suitable
gaskets to ensure weather--tight and airtight seal.
4. All units must have field--supplied filters or accessory
filter rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
5. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases or performance may
be affected.
6. Adequately insulate and weatherproof all ductwork
located outdoors. Insulate ducts passing through
unconditioned space, and use vapor barrier in
accordance with latest issue of Sheet Metal and Air
Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors of
America (ACCA) minimum installation standards for
heating and air conditioning systems. Secure all ducts
to building structure.
7. Flash, weatherproof, and vibration isolate all openings
in building structure in accordance with local codes and
good building practices.
Step 8—Install Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an
electrical wire connected to the unit ground screw in the
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC,
ANSI/NFPA American National Standards
Institute/National Fire Protection Association (latest
edition) (in Canada, Canadian Electrical Code CSA
C22.1) and local electrical codes.
!WARNING
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
unit being installed.
1. Make all electrical connections in accordance with
NEC ANSI/NFPA (latest edition) and local electrical
codes governing such wiring. In Canada, all
electrical connections must be in accordance with
CSA standard C22.1 Canadian Electrical Code Part
1 and applicable local codes. Refer to unit wiring
diagram.
2. Use only copper conductor for connections between
field--supplied electrical disconnect switch and unit.
DO NOT USE ALUMINUM WIRE.
3. Be sure that high--voltage power to unit is within
operating voltage range indicated on unit rating
plate.
4. Do not damage internal components when drilling
through any panel to mount electrical hardware,
conduit, etc.
!CAUTION
HIGH--VOLTAGE CONNECTIONS
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before making any wiring changes, make sure the gas
supply is switched off first. Then switch off the power
supply to the unit and install lockout tag.
!WARNING

10
The unit must have a separate electrical service with a
field--supplied, waterproof disconnect switch mounted at, or
within sight from the unit. Refer to the unit rating plate, NEC
and local codes for maximum fuse/circuit breaker size and
minimum circuit amps (ampacity) for wire sizing.
The field--supplied disconnect switch box may be mounted
on the unit over the high--voltage inlet hole when the
standard power and low--voltage entry points are used (See
Fig. 3 and 4 for acceptable location).
If the unit has an electric heater, a second disconnect may
be required. Consult the Installation, Start--Up, and Service
Instructions provided with the accessory for electrical
service connections.
Operation of unit on improper line voltage constitutes abuse
and may cause unit damage that could affect warranty.
Proceed as follows to complete the high--voltage
connections to the unit.
Single phase units:
1. Run the high--voltage (L1, L2) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line
side of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 23 of
the compressor contactor.
SPECIAL PROCEDURES FOR 208--V OPERATION
1. Disconnect the black primary lead from the
transformer. See unit wiring label (see Fig. 9).
2. Connect the black primary lead to the transformer
terminal labeled 208--v.
Indoor blower--motor speeds may need to be changed for
208--v operation. Refer to indoor airflow and airflow
adjustments section.
CONTROL VOLTAGE CONNECTIONS
Do not use any type of power--stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color--coded,
insulated (35°C minimum) wires to make the control voltage
connections between the thermostat and the unit. If the
thermostat is located more than 100 ft (30.5 m) from the unit
(as measured along the control voltage wires), use no. 16
AWG color--coded, insulated (35°C minimum) wires.
STANDARD CONNECTION
Remove knockout hole located in the electric heat panel
adjacent to the control access panel. See Fig. 3 & 4.
Remove the rubber grommet from the installer’s packet
(included with unit) and install grommet in the knockout
opening. Provide a drip loop before running wire through
panel.
Run the low--voltage leads from the thermostat, through the
inlet hole, and into unit low--voltage splice box.
Locate 18--gage wires leaving control box. These
low--voltage connection leads can be identified by the
colors red, green, yellow, brown (See Fig. 9).
NOTE:If auxiliary electric heat is installed, there may be
additional low voltage control wires.
Ensure the leads are long enough to be routed into the
low--voltage splice box (located below right side of control
box). Route leads through hole in bottom of control box and
make low--voltage connections (See Fig. 9). Secure all cut
wires, so that they do not interfere with operation of unit.
TRANSFORMER PROTECTION
The transformer is of the energy--limiting type. It is set to
withstand a 30--second overload or shorted secondary
condition. If an overload or short is present, correct
overload condition and check for blower fuse on control
board. Replace fuse as required with correct size and
rating.
FIGURE 9 High and Control Voltage Connections
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GND
CONTROL BOX
SPLICE BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
Y
G
R
C
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL)
LEGEND
Field Control-Voltage Wiring
Field High-Voltage Wiring
NOTE: Use blue wire for 3-phase units only.

11
PRE--START--UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
1. Follow recognized safety practices and wear
protective goggles when checking or servicing
refrigerant system.
2. Relieve and recover all refrigerant from system
before touching or disturbing anything inside
terminal box if refrigerant leak is suspected around
compressor terminals.
3. Never attempt to repair soldered connection while
refrigerant system is under pressure.
4. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
5. To remove a component, wear protective goggles
and proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from
system using both high-- and low--pressure
ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs
when necessary. Oil can ignite when exposed
to torch flame.
!WARNING
Use the Start--Up Checklist supplied at the end of this book
and proceed as follows to inspect and prepare the unit for
initial start--up:
1. Remove access panel.
2. Read and follow instructions on all DANGER,
WARNING, CAUTION, and INFORMATION labels
attached to, or shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damage, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates
a refrigerant leak.
c. Leak--test all refrigerant tubing connections using
electronic leak detector, or liquid--soap solution. If
a refrigerant leak is detected, see following Check
for Refrigerant Leaks section.
d. Inspect all field-- and factory--wiring connections.
Be sure that connections are completed and tight.
e. Ensure wires do not touch refrigerant tubing or
sharp sheet metal edges.
f. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser--fan blade is correctly
positioned in fan orifice. Top 1/3 of condenser--fan
blade should be within fan orifice venturi.
b. Make sure that condensate drain pan and trap are
filled with water to ensure proper drainage.
c. Make sure that all tools and miscellaneous loose
parts have been removed.
FIGURE 10 Fan Blade Clearance
FAN GRILLE
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB MOTOR SHAFT
1/2ý
START--UP
Step 1—CHECK FOR REFRIGERANT LEAKS
Proceed as follows to locate and repair a refrigerant leak
and to charge the unit:
1. Locate leak and make sure that refrigerant system
pressure has been relieved and reclaimed from both
high-- and low--pressure ports.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been
opened for repair.
3. Add a small charge of R--22 refrigerant vapor to system
and leak--test unit.
4. Recover refrigerant from refrigerant system and
evacuate to 500 microns if no additional leaks are
found.
5. Charge unit with R--22 refrigerant, using a volumetric
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra
refrigerant to compensate for internal volume of filter
drier.
STEP 2—START--UP ADJUSTMENTS
Complete the required procedures given in the
Pre--Start--Up section before starting the unit. Do not
jumper any safety devices when operating the unit. Do not
operate the unit in cooling mode when the outdoor
temperature is below 40°F (unless accessory low--ambient
kit is installed). Do not rapid cycle the compressor. Allow 5
min. between “on” cycles to prevent compressor damage.
CHECK COOLING CONTROL
Start and check the unit for proper cooling operation as
follows:
1. Place room thermostat SYSTEM switch in OFF
position. Observe that blower motor starts when FAN
switch is placed in ON position and shuts down within
60 sec. when FAN switch is placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN
switch in AUTO position. Set control below room
temperature. Observe that cooling cycle shuts down
when control setting is satisfied.

12
FIGURE 11 PAN324--60 Wiring Diagram

13
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R--22
refrigerant and is tested and factory sealed. Allow system
to operate a minimum of 10 minutes before checking or
adjusting charge.
The refrigerant system is fully charged with R--22
refrigerant and is tested and factory sealed.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R--22
charge.
A refrigerant charging label is attached to the outside of the
service access panel.
The charging label and tables shown refer to system
temperatures and pressures in cooling mode only.
NOTE: Allow system to operate for a minimum of 10
minutes before checking or adjusting refrigerant charge.
IMPORTANT: When evaluating the refrigerant charge, an
indicated adjustment to the specified factory charge must
always be very minimal. If a substantial adjustment is
indicated, an abnormal condition exists somewhere in the
cooling system, such as insufficient airflow across either
coil or both coils.
The charging chart (see Table 4) includes the required
suction line temperature at given suction line pressures and
outdoor ambient temperatures.
An accurate thermocouple or thermistor--type thermometer
and a gauge manifold are required when using the
superheat charging method for evaluating the unit charge.
Do not use mercury or small dial--type thermometers
because they are not adequate for this type of
measurement.
Proceed as follows:
1. Remove caps from low-- and high--pressure service
fittings.
2. Using hoses with valve core depressors, attach low--
and high--pressure gauge hoses to low-- and
high--pressure service fittings, respectively.
3. Start unit and let run until system pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient--air temperature (°F(°C) db).
b. Suction--tube temperature (°F(°C)) at low--side
service fitting.
c. Suction (low--side) pressure (psig).
5. Using Cooling Charging Charts compare outdoor--air
temperature (°F(°C) db) with the suction line pressure
(psig) to determine desired system operating suction
line temperature (See Table 5A).
6. Compare actual suction--tube temperature with desired
suction--tube temperature. Using a tolerance of ±3°F
(±1.7°C), add refrigerant if actual temperature is more
than 3°F(1.7°C) higher than proper suction--tube
temperature, or remove refrigerant if actual
temperature is more than 3°F(1.7°C) lower than
required suction--tube temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks
section.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
NOTE: For cooling operation, the recommended airflow is
350 to 450 cfm for each 12,000 Btuh of rated cooling
capacity.
Table 6 shows cooling airflows at various external static
pressures. Refer to this table to determine the airflow for the
system being installed.
NOTE: Be sure that all supply-- and return--air grilles are
open, free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
!WARNING
Airflow can be changed by changing the lead connections
of the blower motor.
All PAN3 units are factory wired for low speed, except sizes
030 through 048 which are wired for medium speed.
FOR 208/230V
For color coding on the 208/230V motor leads, see Table 3.
Table 3—Color Coding for 208/230V Motor Leads
Black = High Speed
Blue = Medium Speed
Red = Low Speed
To change the speed of the indoor fan motor (IFM), remove
the fan motor speed leg lead from the time delay relay
(TDR). To change the speed, remove and replace with lead
for desired blower motor speed. Insulate the removed lead
to avoid contact with chassis parts.
COOLING SEQUENCE OF OPERATION
With the room thermostat SYSTEM switch in the COOL
position and the FAN switch in the AUTO position, the
cooling sequence of operation is as follows:
When the room temperature rises to a point that is slightly
above the cooling control setting of the thermostat, the
thermostat completes the circuit between thermostat
terminal R to terminals Y and G. These completed circuits
through the thermostat connect contactor coil (C) (through
unit wire Y) and time delay relay (TDR) (through unit wire G)
across the 24--v secondary of transformer (TRAN).
The normally open contacts of energized contactor (C)
close and complete the circuit through compressor motor
(COMP) to condenser (outdoor) fan motor (OFM). Both
motors start instantly.
The set of normally open contacts of energized relay TDR
close and complete the circuit through evaporator blower
(indoor) fan motor (IFM).
NOTE:Once the compressor has started and then has
stopped, it should not be started again until 5 minutes have
elapsed.
The cooling cycle remains on until the room temperature
drops to a point that is slightly below the cooling control
setting of the room thermostat. At this point, the thermostat

14
breaks the circuit between thermostat terminal R to
terminals Y and G. These open circuits deenergize
contactor coil C and relay coil TDR. The condenser and
compressor motors stop. After a 30--second delay, the
blower motor stops. The unit is in a standby condition,
waiting for the next call for cooling from the room
thermostat.
Table 4—Cooling Charging Chart
Table 5— PAN3 Wet Coil Pressure Drop (in. wc)
UNIT
SIZE
STANDARD CFM (S.C.F.M.)
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
024 -- 0.030 0.037 0.044 0.053 0.063 -- -- -- -- -- -- -- -- -- --
030 -- -- 0.037 0.044 0.053 0.063 0.072 0.081 0.105 -- -- -- -- -- -- --
036 -- -- -- -- 0.05 0.061 0.072 0.080 0.090 0.110 -- -- -- -- -- --
042 -- -- -- -- -- 0.044 0.051 0.059 0.065 0.072 0.080 0.088 0.095 0.105 -- --
048 -- -- -- -- -- -- -- 0.044 0.050 0.053 0.059 0.066 0.072 0.077 0.086 --
060 -- -- -- -- -- -- -- -- -- -- 0.079 0.087 0.095 0.102 0.113 0.123

15
Table 6— Dry Coil Air Delivery* — Horizontal Discharge
(Deduct 10% for 208--Volt Operation)
Unit Motor Speed External Static Pressure (in. wc)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
PAN324
Low1Watts 311 309 304 301 286 290 286 280 -- --
CFM 935 885 820 757 686 583 423 263 -- --
Medium Watts 411 405 398 390 379 357 357 345 327
CFM 1195 1155 1100 1028 957 868 769 647 365
High Watts 528 518 509 492 477 467 447 435 421
CFM 1484 1421 1368 1279 1185 1088 970 853 712
PAN330
Low Watts 311 309 304 301 286 290 286 280 -- --
CFM 935 885 820 757 686 583 423 263 -- --
Medium1Watts 411 405 398 390 379 357 357 345 327
CFM 1195 1155 1100 1028 957 868 769 647 365
High Watts 528 518 509 492 477 467 447 435 421
CFM 1484 1421 1368 1279 1185 1088 970 853 712
PAN336
Low Watts 439 429 415 401 395 380 356 339 329
CFM 1242 1170 1089 994 917 837 702 570 442
Medium1Watts 503 491 479 461 450 436 418 404 389
CFM 1320 1244 1162 1081 1005 897 767 662 541
High Watts 641 627 623 609 601 588 571 559 548
CFM 1362 1288 1205 1119 1033 933 826 714 580
PAN342
Low Watts 434 428 422 403 404 390 375 360 344
CFM 1282 1241 1206 1160 1109 1040 967 890 813
Medium1Watts 560 548 535 526 511 496 478 460 439
CFM 1526 1482 1437 1398 1344 1281 1205 1125 1029
High Watts 765 746 730 709 690 664 642 624 600
CFM 1860 1805 1751 1685 1620 1541 1468 1370 1265
PAN348
Low Watts 627 617 607 584 567 548 528 503 480
CFM 1550 1530 1493 1461 1414 1361 1320 1250 1177
Medium1Watts 771 755 734 711 690 665 639 607 572
CFM 1798 1771 1734 1687 1645 1595 1530 1449 1355
High Watts 969 941 908 887 858 827 804 767 748
CFM 2124 2071 2000 1944 1876 1811 1735 1647 1555
PAN360
Low1Watts 786 769 754 736 722 705 684 658 616
CFM 2027 1960 1901 1821 1759 1693 1616 1513 1354
Medium Watts 873 849 833 815 798 782 763 748 704
CFM 2095 2026 1962 1887 1817 1748 1679 1583 1439
High Watts 1012 993 981 963 948 927 904 886 846
CFM 2184 2109 2036 1963 1886 1812 1729 1647 1496
*Air delivery values are without air filter and are for dry coil (see Wet Coil Pressure Drop table).
1Factory--shipped cooling speed
Note: Deduct field--supplied air filter pressure drop and wet coil pressure drop to obtain external static pressure available for
ducting.
MAINTENANCE
To ensure continuing high performance and to minimize the
possibility of premature equipment failure, periodic
maintenance must be performed on this equipment. This
unit should be inspected at least once each year by a
qualified service person. To troubleshoot unit, refer to Table
8, Troubleshooting Chart.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury or death and unit component damage.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical skills,
tools and equipment. If you do not possess these, do not
attempt to perform any maintenance on this equipment,
other than those procedures recommended in the
Owner’s Manual.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow these warnings could result in personal
injury or death:
1. Turn off power supply to unit and insstall lockout tag
before performing any maintenance or service on
this unit.
2. Use extreme caution when removing panels and
parts.
3. Never place anything combustible either on or in
contact with the unit.
!WARNING
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
operation.
Errors made when reconnecting wires may cause
improper and dangerous operation. Label all wires prior
to disconnecting when servicing.
CAUTION
!
The minimum maintenance requirements for this
equipment are as follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.

16
2. Inspect indoor coil, drain pan, and condensate drain
each cooling season for cleanliness. Clean when
necessary.
3. Inspect blower motor and wheel for cleanliness at the
beginning of each heating and cooling season. Clean
when necessary.
4. Check electrical connections for tightness and controls
for proper operation each heating and cooling season.
Service when necessary.
5. Ensure electric wires are not in contact with refrigerant
tubing or sharp metal edges.
AIR FILTER
IMPORTANT: Never operate the unit without a suitable air
filter in the return--air duct system. Always replace the filter
with the same dimensional size and type as originally
installed. See Table 1 for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway--type) or clean (cleanable--type) at least twice
during each cooling season and twice during the heating
season, or whenever the filter becomes clogged with dust
and lint.
INDOOR BLOWER AND MOTOR
NOTE: All motors are pre--lubricated. Do not attempt to
lubricate these motors.
For longer life, operating economy, and continuing
efficiency, clean accumulated dirt and grease from the
blower wheel and motor annually.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect and tag electrical power to the unit before
cleaning the blower motor and wheel.
!WARNING
To clean the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove unit access panel.
b. Disconnect motor lead from time delay relay
(TDR). Disconnect yellow lead from terminal L2 of
the contactor.
c. On all units remove blower assembly from unit.
Remove screws securing blower to blower partition
and slide assembly out. Be careful not to tear
insulation in blower compartment.
d. Ensure proper reassembly by marking blower
wheel and motor in relation to blower housing
before disassembly.
e. Loosen setscrew(s) that secures wheel to motor
shaft, remove screws that secure motor mount
brackets to housing, and slide motor and motor
mount out of housing.
2. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel
orientation.
b. Lift wheel from housing. When handling and/or
cleaning blower wheel, be sure not to disturb
balance weights (clips) on blower wheel vanes.
c. Remove caked--on dirt from wheel and housing
with a brush. Remove lint and/or dirt accumulations
from wheel and housing with vacuum cleaner,
using soft brush attachment. Remove grease and
oil with mild solvent.
d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure
setscrews are tightened on motor shaft flats and
not on round part of shaft.
f. Reinstall unit access panel.
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during
heating and cooling cycles.
OUTDOOR COIL, INDOOR COIL, AND CONDENSATE
DRAIN PAN
Inspect the condenser coil, evaporator coil, and
condensate drain pan at least once each year.
The coils are easily cleaned when dry; therefore, inspect
and clean the coils either before or after each cooling
season. Remove all obstructions, including weeds and
shrubs that interfere with the airflow through the condenser
coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil
or grease, clean the coils with a mild detergent and water
solution. Rinse coils with clear water, using a garden hose.
Be careful not to splash water on motors, insulation, wiring,
or air filter(s). For best results, spray condenser coil fins
from inside to outside the unit. On units with an outer and
inner condenser coil, be sure to clean between the coils. Be
sure to flush all dirt and debris from the unit base.
Inspect the drain pan and condensate drain line when
inspecting the coils. Clean the drain pan and condensate
drain by removing all foreign matter from the pan. Flush the
pan and drain trough with clear water. Do not splash water
on the insulation, motor, wiring, or air filter(s). If the drain
trough is restricted, clear it with a “plumbers snake” or
similar probe device.
OUTDOOR FAN
UNIT OPERATION HAZARD
Failure to follow this caution may result in damage to
unit components.
Keep the condenser fan free from all obstructions to
ensure proper cooling operation. Never place articles
on top of the unit.
CAUTION
!
1. Remove 6 screws holding outdoor grille and motor to
top cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide
fan off motor shaft.

17
5. When replacing fan blade, position blade so that the
hub is 1/8 in. (3mm) away from the motor end (1/8 in.
(3mm) of motor shaft will be visible) (See Fig. 12).
6. Ensure that setscrew engages the flat area on the
motor shaft when tightening.
7. Replace grille.
ELECTRICAL CONTROLS AND WIRING
Inspect and check the electrical controls and wiring
annually. Be sure to turn off the electrical power to the unit.
Remove access panel to locate all the electrical controls
and wiring. Check all electrical connections for tightness.
Tighten all screw connections. If any smoky or burned
connections are noticed, disassemble the connection,
clean all the parts, re--strip the wire end and reassemble the
connection properly and securely.
After inspecting the electrical controls and wiring, replace
all the panels. Start the unit, and observe at least one
complete cooling cycle to ensure proper operation. If
discrepancies are observed in operating cycle, or if a
suspected malfunction has occurred, check each electrical
component with the proper electrical instrumentation. Refer
to the unit wiring label when making these checks.
REFRIGERANT CIRCUIT
Inspect all refrigerant tubing connections and the unit base
for oil accumulation annually. Detecting oil generally
indicates a refrigerant leak.
EXPLOSION, PERSONAL INJURY, EVIRONMENTAL
HAZARD
Failure to follow this warning could result in property
damage, personal injury or death.
System under pressure. Relieve pressure and recover
all refrigerant before system repair or final unit disposal.
Use all service ports and open all flow--control devices,
including solenoid valves.
!WARNING
If oil is detected or if low performance is suspected, leak test
all refrigerant tubing using an electronic leak detector, or
liquid--soap solution. If a refrigerant leak is detected, refer
to Check for Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is
suspected, refer to Checking and Adjusting Refrigerant
Charge section.
INDOOR AIRFLOW
The cooling airflow does not require checking unless
improper performance is suspected. If a problem exists, be
sure that all supply-- and return--air grilles are open and free
from obstructions, and that the air filter is clean.
METERING DEVICES--PISTON
Refrigerant metering device is a fixed orifice and is located
in the distributor assembly to the indoor coil.
There is a liquid header with a brass distributor and feeder
tube going into outdoor coil. At the end of one of the feeder
tubes, there is a 3/8--in. OD stub tube approximately 3 in.
long (see Fig. 21). The defrost thermostat should be located
on this stub tube. Note that there is only one stub tube used
with liquid header, and on most units it is the bottom circuit.
TROUBLESHOOTING
Refer to the Troubleshooting Chart (Table 9) for
troubleshooting information.
START--UP CHECKLIST
Use the Start--Up Checklist at the back of this manual.

18
Table 7—Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor and outdoor fan will not
start
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker
Defective contactor, transformer, control relay, or
high--pressure, loss--of--charge or low--pressure
switch
Replace component
Insufficient line voltage Determine cause and correct
Incorrect or faulty wiring Check wiring diagram and rewire correctly
Thermostat setting too low/too high Reset thermostat setting
Compressor will not start but condenser
fan runs
Faulty wiring or circuit
Loose connections in compressor Check wiring and repair or replace
Compressor motor burned out, seized, or Determine cause
internal overload open Replace compressor
Defective run capacitor, overload, or PTC (posi-
tive temperature coefficient) thermistor Determine cause and replace
One leg of 3--phase power dead Replace fuse or reset circuit breaker
Determine cause
Low input voltage (20 percent low) Determine cause and correct
Compressor cycles (other than normally
satisfying) cooling/heating calls
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system, and
recharge to capacities shown on rating
plate
Defective compressor Replace and determine cause
Insufficient line voltage Determine cause and correct
Blocked outdoor coil Determine cause and correct
Defective run/start capacitor, overload or start
relay Determine cause and replace
Faulty outdoor fan motor or capacitor Replace
Restriction in refrigerant system Locate restriction and remove
Compressor operates continuously
Dirty air filter Replace filter
Unit undersized for load Decrease load or increase unit size
Thermostat temperature set too low Reset thermostat setting
Low refrigerant charge Locate leak, repair, and recharge
Air in system Recover refrigerant, evacuate system, and
recharge
Outdoor coil dirty or restricted Clean coil or remove restriction
Excessive head pressure
Dirty air filter Replace filter
Dirty indoor or outdoor coil Clean coil
Refrigerant overcharged Recover excess refrigerant
Air in system Recover refrigerant, evacuate system, and
recharge
Indoor or outdoor air restricted or air short--cycling Determine cause and correct
Head pressure too low Low refrigerant charge Check for leaks, repair and recharge
Restriction in liquid tube Remove restriction
Excessive suction pressure
High heat load Check for source and eliminate
Reversing valve hung up or leaking internally Replace valve
Refrigerant overcharged Recover excess refrigerant
Suction pressure too low
Dirty air filter Replace filter
Low refrigerant charge Check for leaks, repair and recharge
Metering device or low side restricted Remove source of restriction
Insufficient coil airflow Check filter–replace if necessary
Temperature too low in conditioned area Reset thermostat setting
Outdoor ambient below 55°F Install low--ambient kit
Filter drier restricted Replace

19
START-UP CHECKLIST
(Remove and Store in Job File)
I. Preliminary Information
MODEL NO.:_________________________________
SERIAL NO.:__________________________________
DATE:_______________________________________
TECHNICIAN:_________________________________
II. PRE-START-UP (Insert checkmark in box as each item is completed)
( ) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
( ) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
( ) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
( ) CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE
( ) VERIFY THAT UNIT INSTALLATION IS LEVEL
( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS
III. START-UP
ELECTRICAL
SUPPLY VOLTAGE __________________________________
COMPRESSOR AMPS_________________________________
INDOOR (EVAPORATOR) FAN AMPS___________
TEMPERATURES
OUTDOOR (CONDENSER) AIR TEMPERATURE ___________DB
RETURN-AIR TEMPERATURE ___________DB ___________WB
COOLING SUPPLY AIR ___________DB ___________WB
PRESSURES
REFRIGERANT SUCTION ___________PSIG SUCTION LINE TEMP*___________
REFRIGERANT DISCHARGE ___________PSIG DISCHARGE TEMP†___________
( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
*
Measured at suction inlet to compressor
†Measured at liquid line leavin
g
condenser.