Carrier PAD324 User manual

INSTALLATION INSTRUCTIONS
R--410A Single Package Electric Cooling
PAD324--60
1&3Phase
These instructions must be read and understood completely before attempting installation
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE
The signal words DANGER, WARNING,
CAUTION, and NOTE are used to identify levels
of hazard seriousness. The signal word DANGER
is only used on product labels to signify an
immediate hazard. The signal words WARNING,
CAUTION, and NOTE will be used on product
labels and throughout this manual and other
manual that may apply to the product.
DANGER -- Immediate hazards which will result in
severe personal injury or death.
WARNING --Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION -- Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE -- Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
!WARNING
Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
The signal word CAUTION is used throughout
this manual in the following manner:
!CAUTION
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
SAFETY CONSIDERATIONS 2.................
RECEIVING AND INSTALLATION 2.............
Step 1 -- Check Equipment 2...................
Step 2 -- Provide Unit Support 2.................
Step 3 -- Provide Clearances 3..................
Step 4 -- Field Fabricate Ductwork 3.............
Step 5 -- Rig and Place Unit 3...................
Step 6 -- Provide for Condensate Disposal 7......
Step 7 -- Install Duct Connections 7..............
Step 8 -- Install Electrical Connections 9..........
PRE--START--UP 11............................
START--UP 11.................................
Step 1 -- Check for Refrigerant Leaks 11..........
Step 2 -- Start--Up Cooling Section and Make Adj. 11
Indoor Airflow Adjustments 12...................
Cooling Sequence of Operations 13..............
Wiring Diagram 15.............................
Maintenance 22................................
Troubleshooting 25.............................
Start--Up Checklist 27...........................
TABLE OF CONTENTS !WARNING
PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.
Installation or repairs made by unqualified
persons could result in equipment malfunction,
property damage, personal injury and/or death.
The information contained in this manual is
intended for use by a qualified service technician
familiar with safety procedures and equipped
with proper tools and test instruments.
Installation must conform with local building
codes and with the national Electrical Code
NFPA70 current edition or Canadian Electrical
Code part 1 CSA C.22.1.
513 01 3103 00
04/21/10

2513 01 3103 00
SAFETY CONSIDERATIONS
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 on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words: DANGER, WARNING, and CAUTION. These
words are used with the safety--alert symbol. DANGER identifies
the most serious hazards which will result in severe personal
injury or death. WARNING signifies hazards which could result in
personal 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.
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 and install lockout tag. There may be more
than one disconnect switch. Turn off accessory heater power
switch if applicable.
!WARNING
PERSONAL INJURY AND ENVIRONMENTAL HAZARD
Failure to relieve system pressure could result in personal injury
and/or death.
1. Relieve pressure and recover all refrigerant before servicing
existing equipment, and before final unit disposal. Use all
service ports and open all flow--control devices, including
solenoid valves.
2. Federal regulations require that you do not vent refrigerant
into the atmosphere. Recover during system repair or final unit
disposal.
WARNING
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal parts
and screws. Although special care is taken to reduce sharp
edges to a minimum, be extremely careful when handling parts
or reaching into the unit.
CAUTION
!
FIG. 1 -- UNIT PAD3
INTRODUCTION
The PAD3 units are fully self--contained and designed for outdoor
installation. (See Fig. 1.) 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 on a ground--level cement slab.
(See Fig. 6 for roof curb dimensions.)
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
Identify Unit
The unit model number and serial number are stamped on the
unit identification plate. Check this information against shipping
papers.
Inspect Shipment
Inspect for shipping damage before removing packaging
materials. 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 distributor if any item is missing. To prevent
loss or damage, leave all parts in original packages until
installation.
Step 2 — Provide Unit Support
IMPORTANT: The unit must be secured to the curb by installing
screws through the bottom of the curb flange and into the unit
base rails. When installing large base units onto the common
curb, the screws must be installed before allowing the full weight
of the unit to rest on the curb. A minimum of six screws are
required for large base units. Failure to secure unit properly could
result in an unstable unit. See Warning near Rigging/Lifting
information and accessory curb instructions for more details.
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate if required.
Roof Curb
Install accessory roof curb in accordance with instructions
shipped with curb (See Fig. 6). Install insulation, cant strips,
roofing, and flashing. Ductwork must be attached to curb.

3
513 01 3103 00
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight 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. (6.35 mm) (See Fig. 2). This
is necessary for unit drain to function properly. Refer to accessory
roof curb installation instructions for additional information as
required.
Accessory kits are available to aid in installing a new metal base
rail unit on an old roof curb.
Accessory kit number CPADCURB001A00, (small chassis) and
accessory kit number CPADCURB002A00, (large chassis)
includes roof curb adapter and gaskets for the perimeter seal and
duct openings. No additional modifications to curb are required
when using this kit.
Slab Mount
Place the unit on a solid, level concrete pad that is a minimum of
4 in. (102 mm) thick with 2 in. (51 mm) above grade. The slab
should extend approximately 2 in. (51 mm) beyond the casing on
all 4 sides of the unit. Do not secure the unit to the slab except
when required by local codes.
Step 3 — Provide Clearances
The required minimum service clearances are shown in Fig. 4 and
5. 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. (1219 mm) above the unit top. The maximum horizontal
extension of a partial overhang must not exceed 48 in. (1219
mm).
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. (102 mm) 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. See unit rating plate for any
required clearances 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 shackles,
clevis pins, 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. Materials showing any
kind of wear in these areas must not be used and should be
discarded.
A
B
C
MAXIMUM ALLOWABLE
DIFFERENCE in. (mm)
A-C
1/4 1/4 1/4
(6.35) (6.35) (6.35)
A-B B-C
Fig. 2 -- Unit Leveling Tolerances
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
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
When straps are taut, the clevis should be a minimum
of 36 in. (914 mm) above the unit top cover.
!WARNING
OPTIONAL
RETURN
AIR
OPENING
OPTIONAL
SUPPLY
AIR
OPENING
EVAP. COIL COND. COIL
2˝
(50.8mm)
Fig. 3 -- Slab Mounting Detail

4513 01 3103 00
UNIT
Electrical
Characteristics
Unit WT. Unit HT. Center of Gravity
LB KG A X Y Z
24 208/230--1--60 272 123.3 40 1018 20--1/2 520.7 15--3/4 400.1 16--1/2 419.1 30 208/230--1--60, 208/230--3--60 277 125.3 42 1070 20--1/2 520.7 15--3/4 400.1 16--13/16 427.0 36 208/230--1--60, 208/230--3--60 283 128.3 46 1172 20--1/2 520.7 15--3/4 400.1 17 431.8
460--3--60 297 134.6 46 1172 20--1/2 520.7 15--3/4 400.1 17 431.8
UNIT Voltage
Corner Weight LB/KG
1 2 3 4
24 208/230 54.4 24.7 43.5 19.7 65.2 29.6 108.7 49.3 30 208/230 55.4 25.1 44.3 20.1 66.4 30.2 110.7 50.3 36 208/230 56.6 25.7 45.2 20.5 67.9 30.8 113.1 51.3
460 56.6 25.7 45.2 20.5 76.9 34.9 118.1 53.6
Fig. 4 -- PAD3 2 to 3 Ton Unit Dimensions

5513 01 3103 00
Unit
Electrical
Characteristics
Unit WT. Unit HT. Center of Gravity
LB KG A X Y Z
42 208/230--1--60, 208/230--3--60 369 167.5 45--3/4 1137 20--1/4 514.4 17--1/2 444.5 17--1/8 435
460--3--60 383 173.8 45--3/4 1137 20--1/4 514.4 17--1/2 444.5 17--1/8 435
48 208/230--1--60, 208/230--3--60 375 170.2 46--3/4 1187 20--1/4 514.4 17--1/2 444.5 17--3/8 441
460--3--60 389 176.6 46--3/4 1187 20--1/4 514.4 17--1/2 444.5 17--3/8 441
60 208/230--1--60, 208/230--3--60 397 180.2 46--3/4 1187 20--1/4 514.4 17--1/2 444.5 17--5/8 448
460--3--60 411 186.5 46--3/4 1187 20--1/4 514.4 17--1/2 444.5 17--5/8 448
UNIT Voltage
Corner Weight LB/KG
1 2 3 4
42 208/230 73.8 33.5 59.1 26.8 88.6 40.2 147.7 67.1
460 73.8 33.5 59.1 26.8 97.6 44.3 1527 69.3
48 208/230 75.0 34.1 60.0 27.3 90.1 40.9 150.1 68.1
460 75.0 34.1 60.0 27.3 99.1 45.0 155.1 70.4
60 208/230 79.4 36.1 63.6 28.9 95.3 43.3 158.9 72.1
460 79.4 36.1 63.6 28.9 104.3 47.4 163.9 74.4
Fig. 5 -- PAD3 3.5 to 5 Ton Unit Dimensions

6
513 01 3103 00
FIG. 6 -- ROOF CURB DIMENSIONS
RETURN
AIR
SMALL
BASE
UNIT
SUPPLY
AIR
LARGE
BASE
UNIT
UNIT PLACEMENT ON
COMMON CURB
LARGE CURB
SMALL OR LARGE BASE UNIT
SMALL/COMMON CURB
ROOF CURB DETAIL
Wood nailer*
Roofcurb*
Insulation
(field supplied)
*Provided with roofcurb
Cant strip
field supplied
Roofing material
field supplied
Flashing field
supplied
HVAC unit
base rails
Roofcurb
Sealing
Gasket
HVAC unit
basepan
Anchor screw
A09090
A09413
A09094
A09415
C
B
AF
DE
Dashed lines show cross support
location for large basepan units.
G
H
C
B
A
F
D
E
G
H
UNIT SIZE CATALOG
NUMBER
A
IN. (mm)
B (small base)
IN. (mm)*
B (large base)
IN. (mm)*
C
IN. (mm)
D
IN. (mm)
E
IN. (mm)
F
IN. (mm)
G
IN. (mm)
H
IN. (mm)
Small or Large CPRFCURB010A00 11 (279) 10 (254)
14 (356) 16 (406) 47.8 (1214)
32.4 (822)
2.7 (69)
30.6 (778)
46.1 (1170)
CPRFCURB011A00 14 (356)
Large CPRFCURB012A00 11 (279) 14 (356) 43.9 (1116) 42.2 (1072)
CPRFCURB013A00 14 (356)
* Part Numbers CPRCURB010A00 and CPRCURB011A00 can be used on both small and large basepan units. The cross supports must be located based on whether the unit is a small basepan or a
large basepan.
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being
installed.
3. Roof curb is made of 16--gauge steel.
4. Attach ductwork to curb (flanges of duct rest on curb).
5. Insulated panels: 1--in. (25.4 mm) thick fiberglass 1 lb.
density.

7513 01 3103 00
ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.
PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.
50CY502286 2.0
CAUTION - NOTICE TO RIGGERS
PRUDENCE - AVIS AUX MANIPULATEUR
Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition
SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB
DUCTS
DETAIL A
VOIR DÉTAIL A
MINIMUM HEIGHT: 36" (914.4 mm)
HAUTEUR MINIMUM
UNIT HEIGHT
HAUTEUR D'UNITÉ
SEE DETAIL A
VOIR DÉTAIL A
BANDE SCELLANT DOIT ÊTRE
EN PLACE AVANT DE PLACER
L'UNITÉ SUR LA BASE DE TOIT
FIG. 7 -- RIGGING WEIGHTS
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)
Unit 24 30 36 Unit 42 48 60
lb kg lb kg lb kg lb kg lb kg lb kg
Rigging Weight 279 127 284 129 290 132 Rigging Weight 378 171 384 174 406 184
*For 460 Volt units add 14 lb (6.35 kg) to the rigging weight.
NOTE: See dimensional drawing for corner weights.
Rigging/Lifting of Unit (See Fig. 6.)
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Large base units must be secured to common curb
before allowing full weight of unit to rest on curb. Install
screws through curb into unit base rails while rigging
crane is still supporting unit.
!WARNING
Lifting holes are provided in base rails as shown in Fig. 4 and 5.
1. 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. Attach shackles, clevis pins, and straps to the base rails of
the unit. Be sure materials are rated to hold the weight of
the unit. (See Fig. 7).
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.
After the unit is placed on the roof curb or mounting pad, remove
the top skid.
Step 6 — Provide for Condensate Disposal
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Unit disposes of condensate water through a 3/4 in. NPT fitting
which exits through the base on the evaporator coil access side.
See Fig. 4 & 5 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. (51 mm)
condensate trap at end of condensate connection to ensure
proper drainage. Make sure that the outlet of the trap is at least 1
in. (25 mm) lower than the drain pan condensate connection to
prevent the pan from overflowing (See Fig. 8). 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. (51
mm) trap. Do not undersize the tube. Pitch the drain tube
downward at a slope of at least 1--in. (25 mm) for every 10 ft (3.1
m) of horizontal run. Be sure to check the drain tube for leaks.
Prime trap at the beginning of the cooling season start--up.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
FIG. 8 -- CONDENSATE TRAP
Step 7 — 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.

8
513 01 3103 00
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 connectors 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. (610 mm) 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
FIG. 9 -- SUPPLY AND RETURN DUCT OPENINGS
Horizontal Duct Covers
Basepan
Downflow
(Vertical)
Supply
Knockout
Basepan
Downflow
(Vertical)
Return
Knockout
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
!WARNING
1. Open all electrical disconnects and install lockout tag
before starting any service work.
2. Remove horizontal (metal) ductcovers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Fig. 9.)
3. To remove downflow return and supply knockout covers,
break front and right side connecting tabs with a
screwdriver and hammer. Push cover down to break rear
and left side tabs.
NOTE: These panels are held in place with tabs similar to an
electrical knockout. Reinstall horizontal duct covers (Fig. 9)
shipped on unit from factory. Insure openings are air and
watertight.
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.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for side shot installation.
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.

9513 01 3103 00
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 to minimize the possibility of personal injury if
an electrical fault should occur. 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 NFPA 70 (NEC) (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
NFPA 70 (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.
On 3--phase units, ensure phases are balanced within
2 percent. Consult local power company for correction
of improper voltage and/or phase imbalance.
4. Do not damage internal components when drilling
through any panel to mount electrical hardware,
conduit, etc.
!CAUTION
High--Voltage Connections
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 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. 4 and 5 for
acceptable location.
See unit wiring label (Fig. 12--17) and Fig. 10 for reference when
making high voltage connections. 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.
Three--phase units:
1. Run the high--voltage (L1, L2, L3) 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 L3 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
FIG. 10 -- HIGH-- AND CONTROL--VOLTAGE
CONNECTIONS
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
EQUIP GR
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
W1
Y
G
R
C
WHT(W1)
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
LEADS
W2
VIO (W2)
SPLICE BOX
DH
BLU (DH)
GRA (Y2)
3-Phase
Only
Special Procedures for 208--V Operation
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. Tag the disconnect switch with
a suitable warning label. With disconnect switch open,
move black wire from transformer (3/16 in., 4.8mm)
terminal marked 230 to terminal marked 200. This
retaps transformer to primary voltage of 208 vac.
!WARNING
Control Voltage Connections
NOTE: 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 Connections
Locate the seven (eight for 3--phase) low voltage thermostat leads
in 24 volt splice box. A gray wire is standard on 3--phase units for
connection to an economizer. See Fig. 10 for connection diagram.
Run the low--voltage leads from the thermostat, through the
control wiring inlet hole grommet (Fig. 2 and 3), and into the
low--voltage splice box. Provide a drip loop before running wires
through panel. Secure and strain relief all wires so that they do not
interfere with operation of unit.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to factory supplied control leads from
Indoor Fan Board P4 connector. Factory wires are provided for

10
513 01 3103 00
electric heat staging W1 and W2 (W2 and W3 on IFB). If room
thermostat has only one stage of supplemental heat, connect
white and violet wires shown in Fig. 10 to second stage heat field
wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
Transformer Protection
The transformer is of the energy--limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blower fuse on
Indoor Fan Board. Replace fuse as required with correct size and
rating.
Accessory Electric Heaters Installation
Electric heaters may be installed with the PAD3 units per
instructions supplied with electric heater package. See unit rating
plate for factory--approved electric heater kits.
Table1–PhysicalData--UnitPAD3
UNIT SIZE 24 30 36 42 48 60
NOMINAL CAPACITY (ton) 22--1/2 33--1/2 4 5
SHIPPING WEIGHT* lb.
SHIPPING WEIGHT* (kg)
279
127
284
129
290
132
378
171
384
174
406
184
COMPRESSORS
Quantity
Scroll
1
REFRIGERANT (R- 410A)
Quantity lb
Quantity (kg)
4.8
2.2
6.2
2.8
6.4
2.9
6.1
2.7
6.4
2.9
10.0
4.5
REFRIGERANT METERING DEVICE TXV
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
1...21
10.2
1...21
11.9
1...21
15.4
1...21
13.6
1...21
15.5
2...21
15.5
OUTDOOR FAN
Nominal Cfm
Diameter in.
Diameter (mm)
Motor Hp (Rpm)
2800
24
610
1/5 (810)
3000
24
610
1/5 (810)
3200
24
610
1/5 (810)
3600
26
660
1/5 (810)
4000
26
660
1/5 (810)
3200
26
660
1/5 (810)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
3.7
3...17
3.7
3...17
3.7
3...17
4.7
3...17
4.7
3...17
5.7
INDOOR BLOWER
Nominal Cooling Airflow (Cfm)
Size in.
Size (mm.)
Motor HP (RPM)
800
10x10
254x254
1/2 (1050)
1000
10x10
254x254
1/2 (1050)
1200
11x10
279.4x254
3/4 (1000)
1400
11x10
279.4x254
3/4 (1075)
1600 1750
11x10
279.4x254
11x10
279.4x254
1.0 (1075) 1.0 (1040)
HIGH --- PRESSURE SWITCH
(psig) Cut--- out Reset (Auto)
650 +/--- 15
420 +/--- 25
L O S S --- O F --- C H A R G E / L O W --- P R E S S U R E
SWITCH (Liquid Line) (psig) cut--- out Reset
(auto)
2 0 + / --- 5
45 +/--- 10
RETURN---AIR FILTERS†}
Throwaway Size in.
Throwaway Size (mm)
20x20x1
508x508x25
20x24x1
508x610x25
24x30x1
610x762x25
24x36x1
610x914x25
*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 or 450
ft/minute for high--capacity type. Air filter pressure drop for non--standard filters must not exceed 0.08 IN. W.C.
{If using accessory filter rack refer to the filter rack installation instructions for correct filter size and quantity.
}For 460 volt units, add 14 lb (6.4 kg) to the weight.
Table2–MinimumAirflowforReliableElectricHeaterOperation(CFM)
SIZE 24 30 36 42 48 60
Cfm 800 1000 1200 1400 1600 1750

11 513 01 3103 00
PRE--START--UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
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 compressor plug if refrigerant
leak is suspected around compressor terminals.
3. Do not remove compressor plug until all electrical
sources are disconnected and tagged.
4. Never attempt to repair soldered connection while
refrigerant system is under pressure.
5. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
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
Proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove all access panels.
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 damages, 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. 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.
c. Inspect all field-- and factory--wiring connections. Be
sure that connections are completed and tight.
d. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
e. 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 condensate drain pan and trap are filled
with water to ensure proper drainage.
b. Make sure that all tools and miscellaneous loose parts
have been removed.
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--410A refrigerant vapor to system
and leak--test unit.
4. Recover refrigerant from system and evacuate to 500
microns if no additional leaks are found.
5. Charge unit with R--410A refrigerant, using an accurate
scale. Refer to unit rating plate for required charge.
Step 2 — Start--Up Cooling Section And Make
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 when the
outdoor temperature is below 40°F(4°C) (unless accessory
low--ambient kit is installed). Do not rapid cycle the compressor.
Allow 5 minutes between “on” cycles to prevent compressor
damage.
CHECKING COOLING CONTROL OPERATION
Start and check the unit for proper cooling control 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 when FAN switch is
placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN switch in
AUTO position. Set cooling control below room
temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that compressor
and outdoor fan shut down when control setting is satisfied
and that indoor blower shuts down after 90 sec. fan time
delay expires.
IMPORTANT: Three--phase, scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3--phase power lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor. The 3--phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction
and discharge pressures may be minimal.
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R--410A 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--410A charge.
A subcooling charging chart is attached to the inside of the
compressor access panel. The chart includes the required liquid
line temperature at given discharge line pressures and outdoor
ambient temperatures.
An accurate thermocouple-- or thermistor--type thermometer, and
a gauge manifold are required when using the subcooling
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.
NOTE: Allow system to operate for a minimum of 15 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.

12
513 01 3103 00
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 (5°F[5°C] db).
b. Liquid line temperature (5°F[5°C]) at TXV.
c. Discharge (high--side) pressure (psig).
d. Suction (low--side) pressure (psig) (for reference only).
5. Using Cooling Charging Charts compare outdoor--air
temperature (5°F[5°C] db) with the discharge line pressure
(psig) to determine desired system operating liquid line
temperature (See Fig. 18).
6. Compare actual liquid line temperature with desired liquid
line temperature. Using a tolerance of +25°F(+1.15°C), add
refrigerant if actual temperature is more than 25°F (1.15°C)
higher than proper liquid line temperature, or remove
refrigerant if actual temperature is more than 25°F (1.15°C)
lower than required liquid line temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
AIRFLOW ADJUSTMENTS
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit damage.
For cooling operation, the recommended airflow is 350 to
450 cfm for each 12,000 Btuh of rated cooling capacity. For
heating operation, the airflow must produce a temperature
rise that falls within the range stamped on the unit rating
plate.
CAUTION
!
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
This unit is factory-set up for use with a single cooling fan speed.
In addition, this unit has the field-selectable capability to run two
different cooling fan speeds: The rated cooling fan speed
(350~400 CFM/Ton) and an enhanced dehumidification fan speed
(As low as 320 CFM/Ton) for use with either a dehumidistat or a
thermostat that supports dehumidification.
The cooling speed is marked “LOW” on the interface fan board
(IFB) (Fig. 11) . The factory-shipped settings are noted in Table 4.
There are 4 additional speed tap wires available for use in either
electric heating or cooling (For color coding on the indoor fan
motor leads, see Table 3). The additional 4 speed tap wires are
shipped loose with vinyl caps and are located in the control box,
near the interface fan board (IFB) (Fig. 11).
Single Cooling Fan Speed Set-up (Dehumidification feature
not used)
To change cooling speed:
1. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding). Add the wet coil
pressure drop in Table 5 to the system static to determine
the correct cooling airflow speed in Table 4 that will deliver
the nominal cooling airflow as listed in Table 1 for each size.
2. Remove the current speed tap wire from the “LOW” terminal
on the interface fan board (IFB) (Fig. 11) and place vinyl
cap over the connector on the wire.
3. Connect the desired speed tap wire to the “LOW” terminal
on the interface fan board (IFB).
NOTE: If accessory electric heat is installed, and the electric heat
fan speed is chosen to be the same as the normal cooling fan
speed, the dry airflow must meet or exceed the minimum airflow
speed specified in Table 2 for the specific size unit.
Two Cooling Fan Speeds Set-up (Dehumidification feature
used)
IMPORTANT: Dehumidification control must open control circuit
on humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of
either a 24 VAC dehumidistat or a thermostat which includes
control of a 24 VAC dehumidistat connection. In either case, the
dehumidification control must open the control circuit on humidity
rise above the dehumidification set point. Dehumidification
controls are available with the reverse logic; these must not be
used.
1. Using Fig. 11, move the two pin DEHUM jumper from the
“STD” position to the “DEHUM” position.
2. Remove fan speed tap wire from the “LOW” terminal on the
interface fan board (IFB) (Fig. 11).
3. Determine correct normal cooling fan speed for unit and
application. Add the wet coil pressure drop in Table 5 to the
system static to determine the correct cooling airflow speed
in Table 4 that will deliver the nominal cooling airflow as
listed in Table 1 for each size.
NOTE: If accessory electric heat is installed, the dry airflow must
meet or exceed the minimum airflow speed specified in Table 2 for
the specific size unit. The electric heat fan speed will be the same
as the normal cooling fan speed.
4. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding) for the normal cooling fan
speed and place desired speed tap wire on “HIGH” on the
interface board.
5. Refer to airflow tables (Table 4) to determine allowable
speeds for the dehumidification cooling fan speed. In Table
4, speeds that are not allowed for dehumidification cooling
are shaded.
6. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding) for the dehumidification
cooling fan speed and place desired speed tap wire on the
“LOW” connection on the interface board (IFB). Verify that
static pressure is in the acceptable range for the speed tap
to be used for dehumidification cooling.
7. Use any spare vinyl plugs to cap any unused speed tap
wires.

13 513 01 3103 00
HIGH LOW COM
QC5 QC4 QC3
KZ KL
07 09 080L0 ALO R13 C8 R11 Q1
Q3
D2
AL2
DCR QCR
QC1
C
RL
01
G1
G2
Z1
A7 R9 AB A15
C4
C9
C0
QIL Z2 06 04
U1
C3 R4 RL4
JWZ
C7
D5 D3
R3 R5 R6
R2 JW5
QCB
YR W2 Y C W3W3W2 W2C
JW4
P2 JW3
P4
P1
W2W3 Y2 Y1
YDH GCR
SSTZ-8
P3 SDL
24VAC/R3AMP CDM/C
F1
STD DEHUM
Fig. 11 -- Interface Fan Board (IFB)
Single Speed Cooling With Higher Electric Heat Speed
This unit can also be configured to operate with single speed
cooling and a higher speed for an accessory electric heater.
1. Using Fig. 11, move the two pin DEHUM jumper from the
“STD” position to the “DEHUM” position.
2. See Table 2 for minimum airflow for electric heat operation.
Add electric heater and filter pressure drop to duct system
static pressure to determine total external static pressure.
3. Select speed tap from Table 4 that will achieve required
airflow from Table 2.
4. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding).
5. Connect the desired speed tap wire to the “HIGH” terminal
on the interface fan board (IFB).
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit
component damage or improper operation.
To use this mode, a speed connection must be made
on the “HIGH” terminal that meets or exceeds the
minimum airflow found in Table 2.
!CAUTION
Table3–ColorCodingforIndoor Fan Motor Leads
Black = High Speed
Orange = Med--High Speed
Red = Med Speed
Pink = Med--Low Speed
Blue = Low Speed
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
Continuous Fan Operation
When the DEHUM feature is not used, the continuous fan speed
will be the same as cooling fan speed. When the DEHUM feature
is used, the continuous fan will operate on IFB “LOW” speed
when the DH control lead is not energized, or IFB “HIGH” speed
when the DH lead is energized. (See Figure 11).
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.
A set of normally open contacts on the interface fan board (IFB)
are closed which energizes a circuit to the indoor fan motor (IFB).
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 breaks the circuit between
thermostat terminal R to terminals Y and G. These open circuits
deenergize contactor coil C and IFB. The condenser and
compressor motors stop. After a 90--second delay, the blower
motor stops. The unit is in a standby condition, waiting for the next
call for cooling from the room thermostat.

14
513 01 3103 00
Table4–DryCoilAirDelivery*--HorizontalandDownflowDischarge--UnitPAD324--60
UNIT MOTOR SPEED WIRE
COLOR
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
24
Low Blue CFM 754 650 538 429 --- --- --- --- ---
Med-Low Pink CFM 851 777 675 591 475 --- --- --- ---
Medium1Red CFM 941 851 774 684 576 479 --- --- ---
Med-High Orange CFM 1009 917 840 759 667 577 447 --- ---
High Black CFM 1241 1167 1111 1036 969 881 818 731 640
30
Low Blue CFM 741 638 547 415 --- --- --- --- ---
Med-Low Pink CFM 973 887 823 733 665 538 451 --- ---
Medium Red CFM 1088 1023 954 881 800 723 658 563 461
Med-High1Orange CFM 1140 1064 996 915 840 758 687 564 480
High Black CFM 1202 1140 1082 1015 961 881 810 732 631
36
Low Blue CFM 1234 1168 1093 1021 961 894 825 759 687
Med-Low Pink CFM 1290 1223 1154 1090 1027 977 894 828 762
Medium1Red CFM 1354 1290 1226 1158 1102 1046 981 918 843
Med-High Orange CFM 1606 1546 1489 1430 1371 1316 1258 1208 1140
High Black CFM 1630 1580 1517 1463 1407 1339 1277 1210 1131
42
Low Blue CFM 1295 1234 1182 1126 1075 1016 955 898 857
Med-Low Pink CFM 1345 1282 1235 1194 1140 1095 1027 974 921
Medium Red CFM 1505 1452 1413 1358 1323 1282 1234 1169 1130
Med-High1Orange CFM 1545 1492 1449 1411 1362 1313 1278 1231 1188
High Black CFM 1705 1643 1607 1568 1518 1483 1448 1404 1360
48
Low Blue CFM 1402 1351 1311 1263 1224 1172 1136 1080 1041
Med-Low Pink CFM 1457 1404 1367 1318 1284 1233 1197 1144 1104
Medium1Red CFM 1736 1695 1642 1601 1553 1512 1465 1427 1381
Med-High Orange CFM 2149 2111 2062 2026 1980 1945 1905 1864 1793
High Black CFM 2344 2306 2259 2203 2141 2070 1991 1902 1803
60
Med-Low Pink CFM 1678 1635 1602 1558 1513 1474 1438 1404 1349
Medium1Red CFM 1962 1915 1880 1843 1794 1753 1711 1675 1628
Med-High Orange CFM 2131 2088 2065 2013 1982 1941 1888 1860 1785
High Black CFM 2461 2409 2339 2286 2192 2140 2062 1968 1874
* Air delivery values are without air filter and are for dry coil (See Table 5 -- PAD3 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.
Shaded areas indicate airflows that are not recommended for dehumidification control.
Table5–PAD3WetCoilPressure Drop (in. W.C.)
UNIT
SIZE
STANDARD CFM (S.C.F.M)
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
24 0.030 0.037 0.044 0.053 0.063 -- -- -- -- -- -- -- -- -- --
30 -- 0.037 0.044 0.053 0.063 0.072 0.081 0.105 -- -- -- -- -- -- --
36 -- -- -- 0.055 0.060 0.090 0.100 0.110 0.140 -- -- -- -- -- --
42 -- -- -- -- 0.045 0.050 0.060 0.065 0.075 0.080 0.090 0.094 0.110 -- --
48 -- -- -- -- -- -- 0.041 0.063 0.085 0.100 0.104 0.110 0.120 0.130 --
60 -- -- -- -- -- -- -- -- -- 0.060 0.065 0.072 0.077 0.085 0.100
Table6–WetCoilAirDelivery--Downflowwith1--in.FilterandEconomizer
UNIT SIZE EXTERNAL STATIC PRESSURE (in. W.C.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
36 1333 1289 1256 1214 1152 1118 1076 1035 997 950
42 1612 1569 1527 1481 1451 1393 1351 1317 1278 1242
48 2166 2085 2002 1919 1798 1709 1582 1467 1270 988
60 2298 2239 2180 2110 2044 1951 1862 1777 1697 1591
Table7–FilterPressure Drop (in. W.C.)
FILTER SIZE
in. (mm)
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
20X20X1
(508X508X25) 0.05 0.07 0.08 0.1 0.12 0.13 0.14 0.15 ———————————
20X24X1
(508X610x25) ———.09 .10 .11 .13 .14 .15 .16 —————————
24X30X1
(610X762x25) ———0.04 0.05 0.06 0.07 0.07 0.08 0.09 0.1 ————————
24X36X1
(610X914X25) ———————0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14
Table8–ElectricHeatPressure Drop Small Cabinet: 24--36 cfm
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
5kw 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07
7.5 kw 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 0.05 0.07 0.08 0.09
10 kw 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 0.09 0.10 0.11
15 kw 0.00 0.00 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18
20 kw 0.00 0.00 0.02 0.04 0.06 0.08 0.09 0.11 0.13 0.15 0.17 0.19
Electric Heat Pressure Drop (in. W.C.) Large Cabinet 42--60 cfm
1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
5kw 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12
7.5 kw 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13
10 kw 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13
15 kw 0.00 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15
20 kw 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16

15 513 01 3103 00
Fig. 12 -- Connection Wiring Diagram 208/230--1--60
SEE NOTE 8
BLK
YEL
BLK
BRN
YEL
BLK
ENERGIZED
LEGEND
FIELD SPLICE
TERMINAL (MARKED)
TERMINAL (UNMARKED)
SPLICE (IF USED)
SPLICE (MARKED)
FACTORY WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
ACCESSORY OR OPTIONAL
WIRING
TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
CAP CAPACIT
CCH CRANK C
A
GND GROUND
HR HEATER
IFM INDOOR
F
OFM OUTDOOR
TRAN TRANSFO
R
IFM
C
R
S
R
G
Y
W3
W2
C
TRAN
24V C
230 200 COM
YEL
BRN
C
11 21 BLK
YEL
BLK
YEL
GRN
RED
YEL
WHT
BRN
VIO
P4
P2
P1 R
C
COM
HIGH
3A
FUSE
Y 1 2 4 3 5
1 2 3 4
Y
R
W2
C
W2
W3
W3
C
W2
BLK
YEL
GRN-YEL
GND
L2
L1
COM
BRN
BRN
CCH
BLK BLK
1
COMP COMPRES
COM
GRN
2435
24VAC
COM
IFB INTERFA
C
NOTES:
1. IF ANY OF THE ORIGINAL WIR
E
IT MUST BE REPLACED WITH T
Y
IT’S EQUIVALENT.
2. SEE PRICE PAGES FOR THERMO
S
3. USE 75 DEGREE COPPER CONDU
C
4. REFER TO INSTALLATION INST
R
FOR CORRECT SPEED SELECTIO
N
5. RELOCATION OF SPEED TAPS M
A
WHEN USING FIELD INSTALLED
CONSULT INSTALLATION INSTR
U
DETERMINE CORRECT SPEED TA
P
6. ”DO NOT DISCONNECT PLUG UN
D
7. THIS FUSE IS MANUFACTURED
B
8. UNIT FACTORY-SHIPPED IN ST
D
ACCESSSORY ELECTRIC HEAT
HR1 (5 KW)
HR1 & 2 (10 KW)
HR1,2 & 3 (15 KW)
HR1,2,3
& 4 (20 KW)
HR3
HR2
HR4
13
HR113
BRN
BRN
BRN
BRN
BRN
RED
BLK
YEL
FIELD
SUPPLY
POWER
UNIT ONLY
MAXIMUM WIRE
SIZE 2 AWG.
1
1
OFM
COMPRESSOR PLUG
EQUIP_GND
1
1
1
1
1
WHT
VIO
PNK
GRY
BRN
WHT
VIO
PNK
GRY
BRN
BRN
IFB
24V SPLICE
DISCONNECT
PER NEC
EQUIP.
GND
OFM
CONTROL BOX AREA
COMP
CS
R
CAP
H
CF
IFM
UNIT COMPONENT ARRANGEMENT
OUTDOOR FAN
SECTION
COMPRESSOR
SECTION
INDOOR FAN
SECTION
TRAN
SINGLE PT.
CONNECTION
FOR
ELECT.HEAT
SEE HEATER
SCHEMATIC
FOR WIRING
24V POWER ENTRY
LPS
BOX
HPS
CCH
GRN/YEL
BLK
BLU
GND
BLU
PNK
RED
ORN
BLK
SEENOTE5&6
L1
L2 23 23 CAP
C
23 21
1123
BLU
IF USED
F
C
SEE NOTE 4
5 4 3 2 1 6 7
W3 W2
G
Y2/DH
Y1/Y
R
C
C
C1 C2
HPS LPS
BLK BLU BLU
TSTAT
IFB
C CONTACT
O
LPS LOW PRE
HPS HIGH P
R
COMP
SEE NOTE 7
DEHUM
STD
DH BLU
LOW
FOR WIRING WITH
ELECTRIC HEATERS
SEE SCHEMATIC
ON HEATER
ACCESSORY.
N1
12
11
STD STANDAR
D
DEHUM DEHUMID
H

16
513 01 3103 00
Fig. 13 -- Ladder Wiring Diagram 208/230--1--60
23
SEE NOTE 8
BLK
YEL
BRN
D
YEL
21
L1
CCH
23
COMP
COM
CR
S
CAP
H
F
C
24V
23
R
C
S
230
C
BLK YEL
YEL
BLK
YEL
YEL
BLK
BLK
L2
BLK
BLK
G/Y
BRN
23
G
11
LPS
BLK
BLK
BRN C,TRAN
11
11
IFM
BLU
HPS
OFM
IFM
XN
GL
C
G/Y
BLK
RED
BRN
YEL
GRN
WHT
VIO
P1-7
P1-5
P1-6
P1-4
P1-3
P1-2
P1-1
P2-4
P2-3
P2-2
P2-1
C
C1 C2
HR1
HR4
HR2
HR3
BRN
BRN
BRN
BRN
WHT
VIO
PNK
GRY
2
5
4
3
1
BLU
PNK
RED
BLK
G/Y
HIGH
C
P4-4
P4-3
P4-2
P4-1
P4-5
IFB
RED 24VAC
IF USED
ACCESSORY
ELECTRIC HEAT
G/Y
RED
BRN
WHT
VIO
PNK
GRY
R
C
Y
G
W2
W3
Y
YEL
ORN
SEE NOTE 4
50VL500269
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
BLU
C
TRAN
BLU
BLU BLK
FUSE
3A
BRN
C
BRN
SEE NOTE 7
BL
DH
STD
DEHUM
LOW

17 513 01 3103 00
Fig. 14 -- Connection Wiring Diagram 208/230--3--60
DEHUM
STD
BLK
BLK
BRN
YEL
BLK
YEL
BLK
ENERGIZED
LEGEND
FIELD SPLICE
TERMINAL (MARKED)
TERMINAL (UNMARKED)
SPLICE (IF USED)
SPLICE (MARKED)
FACTORY WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
ACCESSORY OR OPTIONAL
WIRING
TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
CAP CAPACITOR
CCH CRANK CASE HEATER
GND GROUND
HR HEATER RELAY
IFM INDOOR FAN MOTOR
OFM OUTDOOR FAN MOTOR
TRAN TRANSFORMER
IFM
T1
T3
T2
R
G
Y1
W3
W2
C
TRAN
24V C
230 200 COM
YEL
BRN
C
11 21 BLK
YEL
YEL
GRN
RED
YEL
WHT
BRN
VIO
P4
P2
P1
R
C
COM
HIGH
3A FUSE
Y
1 2 4 3 5
1 2 3 4
5 4 3 2 1 6 7
W3 W2
G
Y2/DH
Y1/Y
R
C
Y
R
W2
C
W2 W3
W3
C
W2
BLK
YEL
GRN-YEL GND
N
L
COM
BRN
BRN
CCH
BLK
BLK
1
COMP COMPRESSOR MOTOR
COM
GRN
24 35
24VAC
COM
IFB INTERFACE FAN BOARD
NOTES:
1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED,
THEY MUST BE REPLACED WITH THE SAME WIRE OR IT’S EQUIVALENT.
2. SEE PRICE PAGES FOR THERMOSTATS.
3. USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION.
4. REFER TO INSTALLATION INSTRUCTIONS
FOR CORRECT SPEED SELECTION OF IFM.
5. RELOCATION OF SPEED TAPS MAY BE REQUIRED
WHEN USING FIELD INSTALLED ELECTRIC HEATERS,
CONSULT INSTALLATION INSTRUCTIONS TO
DETERMINE CORRECT SPEED TAP SETTING.
6. IDO NOT DISCONNECT PLUG UNDER LOAD.I
7. THIS FUSE IS MANUFACTURED BY LITTELFUSE, P/N 257003
8. DEHUM FEATURE CANNOT BE USED WHEN ECONOMIZER IS INSTALLED.
UNIT FACTORY-SHIPPED IN STD MODE.
HR3
HR2
HR4
HR1
BRN
BRN
BRN
BRN
BRN
RED
BLK
YEL
FIELD
SUPPLY
POWER
UNIT ONLY
MAXIMUM WIRE
SIZE 2 AWG.
1
1
SCHEMATIC
230-3-60
OFM
COMPRESSOR PLUG
EQUIP_GND
1
1
1
1
1
WHT
VIO
PNK
GRY
BRN
WHT
VIO
PNK
GRY
BRN
BRN
IFB
24V SPLICE
DISCONNECT
PER NEC
EQUIP.
GND
OFM
CONTROL BOX AREA
COMP
C
S
R
CAP
CF
IFM
UNIT COMPONENT ARRANGEMENT
OUTDOOR FAN
SECTION
COMPRESSOR
SECTION
INDOOR FAN
SECTION
TRAN
SINGLE PT.
CONNECTION
FOR
ELECT.HEAT
SEE HEATER
SCHEMATIC
FOR WIRING
24V POWER ENTRY
BOX
CCH
GRN/YEL
BLU
GND
PNK
RED
ORN
BLK
IF USED
SEE NOTE 5 & 6
1
BLU
L1
L3
L2
13 23
CAP
C
21 11
1323
BLU
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
SEE NOTE 4
C
C1 C2
IFB
TSTAT
C CONTACTOR
HPS HIGH PRESSURE SWITCH
LPS LOW PRESSURE SWITCH
COMP
SEE NOTE 7
77
66
11 11
10 10
88
22
33
44
11
55
99
12 12
BLU
YEL
BLK
YEL
BRN
RED
BLK
SAT
ECON
PNK
BLK BLACK
BLU BLUE
BRN BROWN
GRY GRAY
GRN GREEN
ORN ORANGE
PNK PINK
RED RED
VIO VIOLET
WHT WHITE
YEL YELLOW
COLOR CODE
ECON
PLUG
BLU
BLU
Y2 GRY
GRY
PNK
HPS LPS
BLK BLU BLU
BLK
LOW
LPS
HPS
STD STANDARD MODE
DH DEHUMIDIFICATION MODE
DEHUM DEHUMIDIFICATION MODE
ECON ECONOMIZER
FOR WIRING
WITH ELECTRIC
HEATERS SEE
SCHEMATIC
ON HEATER
ACCESSORY.
DH BLU
SEE NOTE 8
ACCESSORY ELECTRIC HEAT
HR1 (5 KW)
HR1 & 2 (10 KW)
HR1,2 & 3 (15 KW)
HR1,2,3 & 4 (20 KW)

18
513 01 3103 00
Fig. 15 -- Ladder Wiring Diagram 208/230--3--60
ORN
SEE NOTE 4
C1
STD
DEHUM
BLK
BLK
CCH
YEL
BRN
BRN
D
YEL
21
L1
13
COMP
COM
CR
S
CAP
24V
23
T3
T1
T2
230
C
BLK YEL
YEL
BLK
YEL
YEL
BLK
BLK
L3
BLK
BLK
G/Y
BLU
13
GRN
11
BLK
C,TRAN
11
11
IFM
OFM
IFM
XN
GL
C
G/Y
BLK
RED
BRN
YEL
GRN
WHT
VIO
P1-7
P1-5
P1-6
P1-4
P1-3
P1-2
P1-1
P2-4
P2-3
P2-2
P2-1
HR1
HR4
HR2
HR3
BRN
BRN
BRN
BRN
WHT
VIO
PNK
GRY
2
5
4
3
1
BLU
PNK
RED
BLK
HIGH
P4-4
P4-3
P4-2
P4-1
P4-5
IFB
RED 24VAC
IF USED
ACCESSORY
ELECTRIC HEAT
G/Y
RED
BRN
WHT
VIO
PNK
GRY
R
C
Y1
G
W2
W3
50VL500270
YEL
L2
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
TRAN
BRN
C
C2
Y
C
13
FUSE
3A
BRN
C
SEE NOTE 7
3
5
6
4
2
8
7
ECON
HARNESS
GRY
Y2
YEL
RED
BLK
PNK BLU
PNK BLU
SAT
BRN
LPS
BLK BLU
HPS
BLU
BLK
BLU
DH
LOW
IRI
ICI
IY1/YI
IGI
IW2I
IW3I
IY2/DHI
SEE NOTE 8
GRY
GRY
YEL
C,IFB
BLU
BRN
RED
YEL
C,IFB
BRN

19 513 01 3103 00
Fig. 16 -- Connection Wiring Diagram 460--3--60
DEHUM
STD
BLK
77
66
11 11
10 10
88
22
33
44
11
55
99
12 12
BLU
YEL
ECON
PLUG
YEL
BLK
ENERGIZED
LEGEND
FIELD SPLICE
TERMINAL (MARKED)
TERMINAL (UNMARKED)
SPLICE (IF USED)
SPLICE (MARKED)
FACTORY WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
ACCESSORY OR OPTIONAL
WIRING
TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
CAP CAPACITOR
CCH CRANK CASE HEATER
GND GROUND
HR HEATER RELAY
IFM INDOOR FAN MOTOR
OFM OUTDOOR FAN MOTOR
TRAN TRANSFORMER
IFM
T1
T3
T2
R
G
Y1
W3
W2
C
TRAN
24 24
460 460
YEL
BRN
C
11 21 BLK
YEL
YEL
GRN
RED
YEL
WHT
BRN
VIO
P4
P2
P1
R
C
COM
HIGH
3A
FUSE
Y
1 2 4 3 5
1 2 3 4
5 4 3 2 1 6 7
W3 W2
G
Y2/DH
Y1/Y
R
C
Y
R
W2
C
W2 W3 W3
C
W2
GRN-YEL GND
L2
L1
COM
BRN
BRN
CCH
BLK
RED
1
COMP COMPRESSOR MOTOR
COM
GRN
24 35
24VAC
COM
IFB INTERFACE FAN BOARD
NOTES:
1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED,
IT MUST BE REPLACED WITH TYPE 90 DEGREE C WIRE OR
IT’S EQUIVALENT.
2. SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES.
3. USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION.
4. REFER TO INSTALLATION INSTRUCTIONS
FOR CORRECT SPEED SELECTION OF IFM.
5. RELOCATION OF SPEED TAPS MAY BE REQUIRED
WHEN USING FIELD INSTALLED ELECTRIC HEATERS,
CONSULT INSTALLATION INSTRUCTIONS TO
DETERMINE CORRECT SPEED TAP SETTING.
6. IDO NOT DISCONNECT PLUG UNDER LOAD.I
7. THIS FUSE IS MANUFACTURED BY LITTELFUSE, P/N 257003
8. THESE FUSES ARE MANUFACTURED BY COOPER BUSSMAN, P/N FNQ-R-5
9. DEHUM FEATURE CANNOT BE USED WHEN ECONOMIZER IS INSTALLED.
UNIT FACTORY-SHIPPED IN STD MODE.
ACCESSSORY ELECTRIC HEAT
HR1 (5 KW)
HR1 & 2 (10 KW)
HR1,2 & 3 (15 KW)
HR1,2,3 & 4 (20 KW)
HR3
HR2
HR4
13
HR113
BRN
BRN
BRN
BRN
BRN
RED
BLK
YEL
FIELD
SUPPLY
POWER
UNIT ONLY
MAXIMUM WIRE
SIZE 2 AWG.
1
1
SCHEMATIC
460-3-60
OFM
COMPRESSOR PLUG
EQUIP_GND
1
1
1
1
1
WHT
VIO
PNK
GRY
BRN
WHT
VIO
PNK
GRY
BRN
BRN
IFB
24V SPLICE
DISCONNECT
PER NEC
EQUIP.
GND
OFM
CONTROL BOX AREA
COMP
C
S
R
CAP
HCF
IFM
UNIT COMPONENT ARRANGEMENT
OUTDOOR FAN
SECTION
COMPRESSOR
SECTION
INDOOR FAN
SECTION
TRAN
SINGLE PT.
CONNECTION
FOR
ELECT.HEAT
SEE HEATER
SCHEMATIC
FOR WIRING
24V POWER ENTRY
BOX
CCH
GRN/YEL
BLU
GND
PNK RED
ORN
BLK
IF USED
SEE NOTE 5 & 6
1
BLU
L1
L3
L2
13 23
CAP
C
21 11
1323
BLU
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
SEE NOTE 4
C
C1 C2
IFB
TSTAT
C CONTACTOR
HPS HIGH PRESSURE SWITCH
LPS LOW PRESSURE SWITCH
COMP
SEE NOTE 7
BLK
YEL
BRN
RED
BLK
SAT
ECON
PNK
BLK BLACK
BLU BLUE
BRN BROWN
GRY GRAY
GRN GREEN
ORN ORANGE
PNK PINK
RED RED
VIO VIOLET
WHT WHITE
YEL YELLOW
COLOR CODE
BLU
BLU
Y2 GRY
GRY
PNK
FU1 5 AMP
FU2 5 AMP
BLK
RED
14 23
CC460V 230V
RED YEL
BLK
BLK
AUTOTRANSFORMER
SEE NOTE 8
BLK
YEL
HPS LPS
BLK BLU BLU
BLK
DH DEHUMIDIFICATION MODE
DEHUM DEHUMIDIFICATION MODE
ECON ECONOMIZER
STD STANDARD MODE
LOW
LPS
HPS
DH BLU
FOR WIRING WITH
ELECTRIC HEATERS
SEE SCHEMATIC
ON HEATER
ACCESSORY.
SEE NOTE 9

20
513 01 3103 00
Fig. 17 -- Ladder Wiring Diagram 460--3--60
STD
DEHUM
BLK
D
YEL
21
L1
CCH
13
COMP
460V
CR
S
CAP
24V
23
T3T1
T2
460V
24V
BLK YEL
YEL
BLK
YEL
YEL
RED
L3
BLK
BLK
G/Y
BRN
BLU
13
GRN
11
BLK
C,TRAN
11
11
IFM
OFM
IFM
X
N
GL
C
G/Y
BLK
RED
BRN
YEL
GRN
WHT
VIO
P1-7
P1-5
P1-6
P1-4
P1-3
P1-2
P1-1
P2-4
P2-3
P2-2
P2-1
HR1
HR4
HR2
HR3
BRN
BRN
BRN
BRN
WHT
VIO
PNK
GRY
2
5
4
3
1
BLU
PNK
RED
BLK
G/Y
HIGH
C
P4-4
P4-3
P4-2
P4-1
P4-5
IFB
RED 24VAC
IF USED
ACCESSORY
ELECTRIC HEAT
G/Y
RED
BRN
WHT
VIO
PNK
GRY
R
C
Y1
G
W2
W3
50VL500271
YEL
L2
ORN
SEE NOTE 4
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
TRAN
BRN
C
C2
Y
C
13
FUSE
3A
BRN
C
BRN
SEE NOTE 7
C1
3
5
6
4
2
8
7
ECON
HARNESS
VIO
Y2
YEL
RED
BLK
PNK BLU
PNK BLU
SAT
COM C
BRN
BRN
LPS
BLK BLU
HPS
BLUBLK
BLU
DH
LOW
IRI
ICI
IY1/YI
IGI
IW2I
IW3I
IY2/DHI
SEE NOTE 9