PA3P
SINGLE--PACKAGED AIR CONDITIONER SYSTEM
WITH R--22 REFRIGERANT
2 TO 5 NOMINAL TONS (SIZES 024--060) 1 & 3 PHASE
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner’s Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS 1........................
INTRODUCTION 2..................................
RECEIVING AND INSTALLATION 2--9.................
Check Equipment 2.................................
Identify Unit 2...................................
Inspect Shipment 2................................
Provide Unit Support 2..............................
Roof Curb 2.....................................
Slab Mount 2....................................
Ground Mount 2.................................
Provide Clearances 2................................
Field Fabricate Ductwork 2...........................
Rig and Place Unit 2................................
Inspection 2.....................................
Installation 6.....................................
Use of Rigging Bracket 6...........................
Connect Condensate Drain 7..........................
Install Duct Connections 7............................
Configuring Units for Downflow (Vertical) Discharge 7.....
Install Electrical Connections 8........................
High--Voltage Connections 9........................
Special Procedures for 208v Operation 9...............
Control Voltage Connections 9.......................
Standard Connection 9.............................
Transformer Protection 9...........................
PRE--START--UP 10..................................
START--UP 11--16....................................
Check for Refrigerant Leaks 11........................
Start--Up Adjustments 11.............................
Checking Cooling Control Operation 11...............
Checking and Adjusting Refrigerant Charge 11..........
Indoor Airflow and Airflow Adjustments 11............
Cooling Sequence of Operation 16....................
MAINTENANCE 16--18...............................
Air Filter 17.......................................
Indoor Blower and Motor 17..........................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 17....
Outdoor Fan 18....................................
Electrical Controls and Wiring 18......................
Refrigerant Circuit 18................................
Indoor Airflow 18..................................
Metering Devices–AccuRater
TROUBLESHOOTING 18.............................
START--UP CHECKLIST 18...........................
®
Piston 18................
A05120
Fig. 1 -- Unit PA3P
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 personnelcanperform basicmaintenancefunctionssuch
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
Whenyouseethissymbol on the unit and in instructionsor manuals,
be alert to the potential for personal injury. Understand thesesignal
words: DANGER, WARNING, and CAUTION. Th ese wo rds 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 personalinjury
or death. CAUTION is used to identify unsafepractices 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.
.
1
!
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.
The PA3P packaged air conditioner is fully self--contained and
designed for outdoor installation (See Fig. 1). See Fig. 2 and 3 for
unit dimensions. All unit sizes have discharge openings for both
horizontal and downflow configurations, and are factory shipped
withall downflow duct openings covered. The unitmay beinstalled
either on a rooftop, gound --level cement slab, or directly on the
gound if local codes permit. (See Fig. 4 for roof curb dimensions.)
PA3P
Step 1—Check Equipment
IDENTIFY UNIT
The unit model number and serial number are printed on the unit
informative 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 fromitsanchorage,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 preventloss 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.
ROOF CURB
Install accessory roof curb in accordance with instructions shipped
with curb (See Fig. 4). 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. (See Fig. 6). 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. thick with 2 in. above grade. The slab should extend
approximately2 in. beyond the casing on all 4 sidesofthe unit (See
Fig. 7). Do not secure the unit to the slab except when required by
local codes.
GROUND MOUNT
The unit may be installed either on a slab or placed directly on the
groundif localcodes permit. Place theunitonlevel ground prepared
with gravel for condensate discharge.
Step 3—Provide Clearances
The required minimum service clearances are shown in Fig. 2 and
3. 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
RECEIVING AND INSTALLATION
WARNING
INTRODUCTION
recirculate to the outdoor coil. Do not locate the unit in either a
corner or under an overhead obstruction. The minimum clearance
undera partial overhang(such as a normal houseoverhang) is 48 in.
above the unit top. The maximum horizontal extension of a partial
overhang must not exceed 48 in.
IMPORTANT: Do not restrict outdoor airflow. An air restrictionat
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. 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
requiredaround ductwork. Cabinetreturn--air staticshall not exceed
-- . 2 5 i n . w c .
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 theequipment,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
2
*
REQUIRED CLEARANCE TO COMBUSTIBLE MATL
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]
ELECTRIC HEAT PANEL .................................................................36.00 [914.4]
NEC. REQUIRED CLEARANCES.
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]
LEGEND
CG - Center of Gravity
COND - Condensor
EVAP - Evaporator
NEC - National Electrical Code
REQ’D - Required
NOTE: Dimensions are in in. [mm]
.
INCHES [mm]
INCHES [mm]
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................36.00 [914.0]
(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 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
INCHES [mm]
PA3P
UNIT
ELECTRICAL
CHARACTERISTICS
PA3P024 208/230--- 1---60 420 190.5 39.02 [991] 20.0 [508] 19.3 [490] 17.6 [447]
PA3P030 208/230--- 1--- 60, 208/230 --- 3 --- 60 425 192.8 41.02 [1042] 20.0 [508] 14.0 [356] 13.0 [330]
PA3P036
208/230--- 1---60, 208/230 --- 3 ---60,
4 6 0 --- 3 --- 6 0
UNIT WEIGHT
lb kg X Y Z
UNIT HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
432 196.0 42.98 [1092] 20.0 [508] 14.0 [356] 13.0 [330]
Fig. 2 -- PA3P024--036 Unit Dimensions
3
A06083
PA3P
REQUIRED CLEARANCE TO COMBUSTIBLE MATL.
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]
ELECTRIC HEAT PANEL .................................................................36.00 [914.4]
NEC. REQUIRED CLEARANCES.
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]
INCHES [mm]
INCHES [mm]
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................36.00 [914.0]
(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 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
LEGEND
CG - Center of Gravity
COND - Condensor
EVAP - Evaporator
NEC - National Electrical Code
REQ’D - Required
INCHES [mm]
NOTE: Dimensions are in in. [mm]
UNIT
ELECTRICAL
CHARACTERISTICS
PA3P042 208/230--1--60, 208/230--3--60, 460--3--60 553 250.8 46.98 [1193] 21.0 [533] 20.5 [520] 17.1 [434]
PA3P048 208/230--1--60, 208/230--3--60, 460--3--60 559 253.5 46.98 [1193] 21.0 [533] 20.0 [508] 17.4 [442]
PA3P060 208/230--1--60, 208/230--3--60, 460--3--60 564 255.8 46.98 [1193] 21.0 [533] 20.0 [508] 17.6 [447]
UNIT WEIGHT
UNIT HEIGHT
IN. [MM]
lb kg X Y Z
Fig. 3 -- PA3P042--060 Unit Dimensions
4
“A”
CENTER OF GRAVITY
IN. [MM]
A06084
HVAC unit
Scre w
(NO TE A)
*Gask eting
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant str ip
field supplied
base
Gask eting
inner flange*
Wood nailer*
Roof curb*
Insulation (field
supplied)
Ductwork
field supplied
HVAC unit
Scre w
(NOTE A)
*Gask eting
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant str ip
field supplied
base
Gask eting
inner flange*
Ductwork
field supplied
Wood nailer*
Roof curb*
Insulation (field
supplied)
*Provided with roof curb
Roof Curb for Small Cabinet
Note A: When unit mounting scre w is used,
Return opening
UNIT SIZE
PA3P024 ---036
PA3P042 ---060
retainer bra cke t must also be used.
G
F
(B X C)
ODS CATALOG
NUMBER
CPRFCURB006A00 8 (203) 11 (279) 16 --- 1/2 (419) 28---3/4 (730) 30---3/8 (771) 44 ---5/16 (1126) 45---15/16 (1167)
CPRFCURB007A00 14 (356) 11 (279) 16--- 1/2 (419) 28 ---3/4 (730) 30 ---3/8 (771) 44 ---5/16 (1126) 45---15/16 (1167)
CPRFCURB008A00 8 (203) 16--- 3/16 (411) 17---3/8 (441) 40---1/4 (1022) 41---15/16 (1065) 44 ---7/16 (1129) 46---1/16 (1169)
CPRFCURB009A00 14 (356) 16--- 3/16 (411) 17 --- 3/8 (441) 40---1/4 (1022) 41--- 15/16 (1065) 44 ---7/16 (1129) 46--- 1/16 (1169)
B Typ.
Insulated
deck pan
Roof
E
Supply opening
(B x C)
D
C Typ .
Short
Support
Long
Support
A
IN. (MM)BIN. (MM)
A
E
C
IN. (MM)
*Provided with roof curb
Roof Curb for Large Cabinet
Note A: When unit mounting scre w is used,
retainer bra cket must also be used.
G
F
R/A
D
Insulated
deck pan
D
IN. (MM)
Gask et around
duct
Gask et around
outer edge
E
IN. (MM)
F
IN. (MM)
Roof
S/A
IN. (MM)
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. Dimensions are in inches.
4. Dimension in ( ) are in millimeters.
5. Roof curb is made of 16 --gauge steel.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Insulated panels: 1--in. thick fiberglass 1 lb. density.
8. When unit mounting screw is used (see Note A), a retainer bracket mu st b e used as well. This bracket must also be used when requ ired by code for h urricaneorseismic
conditions. This bracket is available through Micrometl.
Fig. 4 -- Roof Curb Dimensions
PA3P
A05308
G
5
y
A
1
2
DETAIL A
4
PA3P
Corner Weight 1 79 84 86 Corner Weight 1 93 98 100
Corner Weight 2 65 60 62 Corner Weight 2 91 92 84
Corner Weight 3 113 111 111 Corner Weight 3 148 146 155
Corner Weight 4 168 170 173 Corner Weight 4 221 223 225
Rigging Weight 439 444 451 Rigging Weight 575 581 586
Shipping Weight 474 479 486 Shipping Weight 615 621 626
CORNER WEIGHTS (SMALL CABINET)
Unit 024 030 036 Unit 042 048 060
Total Weight 420 425 432 Total Weight 553 559 564
B
Fig. 6 -- Unit Leveling Tolerances
x
Fig. 5 -- PA3P Unit Corner Weights (in Pounds) and Suggested Rigging
C
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B B-C A-C
1/4 1/4 1/4
3
C00071
C99065
CORNER WEIGHTS (LARGE CABINET)
!
UNIT FALLING HAZARD
Failure to follow this warning could result in personal injury
or death.
Never stand beneath rigged units or lift over people.
INSTALLATION
The lifting/rigging bracket is engineered and designed to be
installed only on Small Packaged Products. This bracket is to be
used to rig/lift a Small Packaged Product onto roofs or other
elevated structures.
WARNING
A06361
OPTIONAL
RETURN
AIR
OPENING
2"
EVAP. COIL COND. COIL
Fig. 7 -- Slab Mounting Detail
OPTIONAL
SUPPLY
AIR
OPENING
C99096
!
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.
USE OF RIGGING BRACKET
Field Installation of Rigging
1. If applicable, 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 ofsufficient length to protect the
unit from damage.
2. Remove 4 screws in unit corner posts.
6
WARNING
Bracket
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.
!
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 diameterscrew
(included).
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
oppositeendsof 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 clevislocation to ensure unit is lifted level
with the ground.
4. Afterunit is securely in placedetach rigging straps. Remove
corner posts screws, and rigging brackets then reinstall
screws.
!
UNIT FALLING 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
inches above the unit top cover.
After the unit is placed on the roof curb or mounting pad, remove
the top crating.
Step 6—Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Model PA3P disposes of condensate water through a 3/4 in. NPT
fitting which exits through the base on the evaporator coil access
side. See Fig. 2 & 3 for location.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground
levelinstallations. Install a field--supplied condensate trapat 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. 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.
copperpipe (allfield--supplied) at the outlet end of the 2--in. trap.Do
not undersize the tube. Pitch the drain tube downward at a slope of
at least 1 --in. for every 10 ft of horizontal run. Be sure to check the
WARNING
WARNING
WARNING
drain tube for leaks. Prime trap at the beginning of the cooling
season start--up.
1” (25mm) MIN.
TRAP
OUTLET
2” (50mm) MIN.
C99013
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.
Select and sizeductwork, 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 openingson
the side of the unit.
When designing and installing ductwork, consider the following:
1. Allunitsshould havefield--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.
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 quantitiesbelow
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 ContractorsAssociation
(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 performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
1. Open all electricaldisconnectsand install lockout tag before
starting any service work.
WARNING
PA3P
7
2. Removereturn duct cover located on duct panelby breaking
four(4)connecting tabs with screwdriverand a hammer (See
Fig. 9 & 10).
3. To remove supply duct cover, break front and right side
connecting tabs with a screwdriver and a hammer. Push
louverdown to breakrear and leftside tabs(See Fig. 9 & 10).
4. If unit ductwork is to be attached to vertical opening flanges
on the unit compositebase (jackstand applications only), do
so at this time. Collect ALL screws that were removed. Do
not leave screwson rooftop aspermanentdamageto the roof
may occur.
5. It is recommended that the unit base insulation around the
perimeter of the vertical return--air opening be secured to the
unit base with aluminum tape. Applicable local codes may
require aluminum tape to prevent exposed fiberglass.
6. Cover both horizontal duct openings with the duct covers
from the accessory duct cover kit. Ensure opening is air--and
watertight.
PA3P
7. After completing unit conversion, perform all safety checks
and power up unit.
NOTE:The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence--type airconditioning 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 insulateand 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.
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
Fig. 9 -- Supply and Return Duct Opening
DUCT COVERS REMOVED
Fig. 10 -- Vertical Duct Cover Removed
Step 8—Install Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electricalground to minimizethe possibilityof 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 installedin 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.
C99011
C99012
8
!
CAUTION
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 surethathigh-- voltage power to unit is within operating
voltage range indicated on unit rating plate. On 3--phase
units, ensure phasesare balanced within2 percent. Consult
local power company for correction of improper voltage
and/or phase imbalance.
4. Do not damageinternalcomponentswhen drilling through
any panel to mount electrical hardware, conduit, etc.
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 mountedon the unit over the
high--voltage inlet hole when the standard power and low--voltage
entry points are used. See Fig. 2 and 3 for acceptable location.
See unit wiring label and Fig. 11 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 L2 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L3 to blue wire from compressor.
SPECIAL PROCEDURES FOR 208--V OPERATION
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Make sure that the power supply to the unit is switched OFF
and lockout tag installed before making any wiring changes.
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 thethermostat and the unit.If the thermostatis located more
than 100 ft 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. 2 & 3. 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 five 18--gage wires leaving control box. These low--voltage
connection leads can be identified by the colors red, green, yellow,
brown (See Fig. 11). Ensure the leads are long enough to be routed
into the low--voltage splicebox (located below right side of control
box).Strippedyellow wire is located in connection box. Routeleads
through hole in bottom of control box and make low--voltage
connections (See Fig. 11). 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.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
FIELD-SUPPLIED
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
LEGEND
Field Control-Voltage Wiring
NOTE: Use blue wire for 3-phase units only.
Field High-Voltage Wiring
GND
SPLICE BOX
FUSED DISCONNECT
YEL(Y)
GRN(G)
RED(R)
BRN(C)
Y
G
R
C
POWER
SUPPLY
THERMOSTAT
(TYPICAL)
C99010
Fig. 11 -- High-- and Control--Voltage Connections
PA3P
9
Table 1—Physical Data--Unit PA3P
UNIT SIZE 024 030 036 042 048 060
NOMINAL CAPACITY (ton) 2 2--1/2 3 3--1/2 4 5
OPERATING WEIGHT (lb.) 420 425 432 553 559 564
COMPRESSOR Scroll
REFRIGERANT (R-- 22) Quantity (lb.) 5.9 6.0 7.2 7.8 12.4 12.0
REFRIGERANT METERING DEVICE AccuRater
ORIFICE OD (in.) 0.065 0.070 0.080 0.084 0.088 0.098
OUTDOOR COIL
Rows…Fins/in. 2…21 2…21 2…21 2…21 2…21 2…21
Face Area (sq. ft.) 10.2 11. 9 13.6 19.4 19.4 19.4
OUTDOOR FAN
Nominal Cfm 2200 2800 3000 3500 3500 4200
Diameter 22 22 22 22 22 22
Motor HP (RPM) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/4 (1100) 1/4 (1100)
INDOOR COIL
Rows…Fins/in. 3…17 3…17 4…17 3…17 3…17 4…17
Face Area (sq. ft.) 3.7 3.7 3.7 4.7 5.7 5.7
INDOOR BLOWER
Nominal Airflow (Cfm) 800 1000 1200 1400 1600 1750
Size (in.) 10x10 10x10 10x10 11x1 0 11x10 11 x1 0
Motor HP (RPM) 1/3 (1050) 1/3 (1050) 1/2 (1000) 1/2 (1075) 1/2 (1075) 1.0 (1040)
RETURN-- AIR FILTERS (IN.)*
PA3P
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.
20x24x1 20x24x1 20x24x1 24x36x1 24x36x1 24x36x1
®
Table 2—Minimum Airflow for Safe Electric Heater Operation (Cfm)
SIZE 024 030 036 042 048 060
Cfm 800 1000 1200 1400 1600 1750
PRE--START--UP
!
WARNING
FIRE,EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death and/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 anything inside terminal box if
refrigerant leak is suspectedaround 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.
Proceed as follows to inspect and prepare theunit 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 allrefrigerant 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 outdoor fan blade is correctly positioned
in fan orifice (See Fig. 12).
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.
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB
MOTOR SHAFT
FAN GRILLE
1/2ý
Fig. 12 -- Fan Blade Clearance
C99009
10
START--UP
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 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.
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 isbelow 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 after 30 second fan time
delay expires 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 30 second 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 dramatically lower than normal.
CHECKING AND ADJUSTING REFRIGERANT 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 superheat charging chart is attached to the outside of the service
access panel. The chart includes the required suction line
temperature at given suction line pressures and outdoor ambient
temperatures.
An accurate superheat, 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.
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.
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 Fig. 16).
6. Compare actual suction--tube temperature with desired
suction-- tube temperature. Using a tolerance of ±3°F, a dd
refrigerant if actual temperature is more than 3°F higher than
proper suction--tube temperature, or remove refrigerant if
actual temperature is more than 3°F 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 3 shows cooling airflows at various external static pressures.
Refer to this table to determine the airflow for the system being
installed.
NOTE: Be surethatallsupply-- 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
PA3P
11
Table 3—Wet Coil Air Delivery* — Horizontal Discharge
(Deduct 10% for 208--Volt Operation)
Unit
50SD024
50SD030
50SD036
PA3P
50SD042
50SD048
50SD060
*Air delivery values are without air filter and are for dry coil (see Wet Coil Pressure Drop table).
1
Factory--shipped cooling speed
“NA” = Not allowed for heating speed
Motor
Speed
Low
Medium
High
Low
Medium
High
Low
Medium
High
Low
Medium
High
Low
Medium
High
Low
Medium
High
Watts 311 309 304 301 286 290 286 280 --- --- --- --- ---
1
CFM 935 885 820 757 686 583 423 263 --- --- --- --- --Watts 411 405 398 390 379 357 357 345 327
CFM 1195 1155 1100 1028 957 868 769 647 365
Watts 528 518 509 492 477 467 447 435 421
CFM 1484 1421 1368 1279 1185 1088 970 853 712
Watts 311 309 304 301 286 290 286 280 --- --- --- --- --CFM 935 885 820 757 686 583 423 263 --- --- --- --- ---
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Watts 411 405 398 390 379 357 357 345 327
1
CFM 1195 1155 1100 1028 957 868 769 647 365
Watts 528 518 509 492 477 467 447 435 421
CFM 1484 1421 1368 1279 1185 1088 970 853 712
Watts 439 429 415 401 395 380 356 339 329
CFM 1242 1170 1089 994 917 837 702 570 442
Watts 503 491 479 461 450 436 418 404 389
1
CFM 1320 1244 1162 1081 1005 897 767 662 541
Watts 641 627 623 609 601 588 571 559 548
CFM 1362 1288 1205 1119 1033 933 826 714 580
Watts 434 428 422 403 404 390 375 360 344
CFM 1282 1241 1206 1160 1109 1040 967 890 813
Watts 560 548 535 526 511 496 478 460 439
1
CFM 1526 1482 1437 1398 1344 1281 1205 1125 1029
Watts 765 746 730 709 690 664 642 624 600
CFM 1860 1805 1751 1685 1620 1541 1468 1370 1265
Watts 627 617 607 584 567 548 528 503 480
CFM 1550 1530 1493 1461 1414 1361 1320 1250 1177
Watts 771 755 734 711 690 665 639 607 572
1
CFM 1798 1771 1734 1687 1645 1595 1530 1449 1355
Watts 969 941 908 887 858 827 804 767 748
CFM 2124 2071 2000 1944 1876 1811 1735 1647 1555
Watts 786 769 754 736 722 705 684 658 616
1
CFM 2027 1960 1901 1821 1759 1693 1616 1513 1354
Watts 873 849 833 815 798 782 763 748 704
CFM 2095 2026 1962 1887 1817 1748 1679 1583 1439
Watts 1012 993 981 963 948 927 904 886 846
CFM 2184 2109 2036 1963 1886 1812 1729 1647 1496
Table 4—PA3P Wet Coil Pressure Drop
UNIT SIZE
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 0.08 0.09 0.11 -- -- -- -- -- -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
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
External Static Pressure (in. wc)
STANDARD CFM (S.C.F.M.)
12
PA3P
A07034
Fig. 13 -- Wiring Diagram 208/230--1--60
13
PA3P
A07035
Fig. 14 -- Wiring Diagram 208/230--3--60
14
PA3P
A07037
Fig. 15 -- Wiring Diagram 460--3 --60
15
PA3P
A05109v2
Fig. 16 -- Cooling Charging Chart
Airflow can be changed by changing the lead connections of the
blower motor.
All PA3P units are factory wired for low speed.
FOR 208/230v
For color coding on the 208/230v motor leads, see Table 5.
Table 5—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). This wire is
attached to terminal--3 of TDR for 3--phase units. To change the
speed, remove and replace with lead for desired blowermotor 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 sequenceof
operation is as follows:
When the room temperaturerisesto a point that is slightly abovethe
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 setof normally open contactsof energized relay TDR closeand
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 breaks the circuit between
thermostat terminal R to terminals Y and G. These open circuits
deenergize contactorcoilC and relay coil TDR. The condenserand
compressormotorsstop. Aftera 30--seconddelay,theblowermotor
stops.The unitisin a standbycondition, waiting for the next call for
cooling from the room thermostat.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This cooling unit should be
16
inspected at least once each year by a qualified service person. To
troubleshoot unit, refer to Table 6, 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 possible 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.
!
ELECTRICAL SHOCK HAZARD
Failure to follow these warnings could result in personal
injury or death:
1. Turn off electrical power to the unit 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.
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Errors made when reconnecting wires may cause improper
and dangerous operation. Label all wires prior to
disconnecting when servicing.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
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 each cooling
season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each 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 ductsystem. 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
WARNING
WARNING
!
CAUTION
NOTE: All motors are pre--lubricated. Do not attempt to lubricate
these motors.
For longer life, operatingeconomy, andcontinuing 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 powerto theunit beforecleaning
and lubricating the blower motor and wheel.
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 leadfrom terminalL2 of thecontactor.
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. Ensureproperreassembly by marking wheel orientation.
b. Liftwheelfrom housing. When handling and/orcleaning
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 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,usinga gardenhose. Be careful not to splashwater 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
WARNING
PA3P
17
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 inspectingthe
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
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.
!
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
PA3P
unit.
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.
5. When replacing fan blade, position blade so that the hub is
1/8 in. away from the motor end (1/8 in. of motor shaft will
be visible) (See Fig. 12).
6. Ensure that setscrew engagesthe flatarea 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 alltheparts, re--stripthewire 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
CAUTION
!
EXPLOSION, PERSONAL INJURY 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.
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--ACCURATER PISTON
This metering device is a fixed orifice and is contained in the brass
body in the liquid line feeding the indoor coil.
Refer to the Troubleshooting Chart (Table 6) for troubleshooting
information.
Use the Start--Up Checklist at the back of this manual.
WARNING
TROUBLESHOOTING
START--UP CHECKLIST
18
Table 6—Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor and outdoor fan
will not start
Compressor will not start but condenser fan
runs
Three--phase scroll compressor (size 030-060 unit) has a low pressure differential
Compressor cycles (other than normally satisfying) cooling/heating calls
Compressor operates continuously
Excessive head pressure
Head pressure too low
Excessive suction pressure
Suction pressure too low
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
Insufficient line voltage Determine cause and correct
Incorrect or faulty wiring Check wiring diagram and rewire correctly
User Interface setting too low/too high ResetUIsetting
Faulty wiring or circuit
Loose connections in compressor
Compressor motor burned out, seized, or Determine cause
internal overload open Replace compressor
Defective run capacitor, overload, or PTC (positive
temperature coefficient) thermistor
One leg of 3--phase power dead
Low input voltage (20 percent low) Determine cause and correct
Scroll compressor is rotating in the wrong direction
Refrigerant overcharge or undercharge
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
Dirty air filter Replace filter
Unit undersized for load Decrease load or increase unit size
UI temperature set too low ResetUIsetting
Low refrigerant charge Locate leak, repair, and recharge
Air in system
Outdoor coil dirty or restricted Clean coil or remove restriction
Dirty air filter Replace filter
Dirty indoor or outdoor coil Clean coil
Refrigerant overcharged Recover excess refrigerant
Air in system
Indoor or outdoor air restricted or air short--cycling Determine cause and correct
Low refrigerant charge Check for leaks, repair and recharge
Restriction in liquid tube Remove restriction
High heat load Check for source and eliminate
Reversing valve hung up or leaking internally Replace valve
Refrigerant overcharged Recover excess refrigerant
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 ResetUIsetting
Outdoor ambient below 55°F Install low--ambient kit
Filter drier restricted Replace
Replace component
Check wiring and repair or replace
Determine cause and replace
Replace fuse or reset circuit breaker
Determine cause
Correct the direction of rotation by reversing the
3--phase power leads to the unit
Recover refrigerant, evacuate system, and recharge to capacities shown on rating plate
Recover refrigerant, evacuate system, and recharge
Recover refrigerant, evacuate system, and recharge
PA3P
19
START-UP CHECKLIST
*
g
(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
PA3P
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
condenser.
E2007 Payne Heating & Cooling Systems
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
HEATING & COOLING
Printed in the U.S.A. Edition Date: 03/07
20
C a t a l o g N o : I M --- P A 3 P --- 0 6
R e p lac e s : I M --- PA 3 P --- 0 5
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