Installation Instructions
PA3A, PA4A
R--410A SPLIT--SYSTEM
AIR CONDITIONER
1--1/2 -- 5 TONS (018--060)
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
National Electrical Code (NEC) for special requirements.
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, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out
and tag switch with a suitable warning label.
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
R--410A refrigerant systems operate at higher pressures than
standard R--22 systems. Do not use R--22 service equipment
or components on R --410A refrigerant equipment.
WARNING
WARNING
GENERAL
INSPECT NEW UNIT
After uncrating unit, inspect thoroughly for hidden damage. If
damage is found, notify the transportation company immediately
and file a concealed damage claim.
LOCATION
Check local codes for regulations concerning zoning, noise,
platforms, and other issues.
Locate unit away from fresh air intakes, vents, or bedroom
windows. Noise may carry into the openings and disturb people
inside.
Locate unit in a well drained area, or support unit high enough so
that water runoff will not enter the unit.
!
!
Locate unit away from areas where heat, lint, or exhaust fumes will
be discharged onto unit (as from dryer vents).
Locate unit away from recessed or confined areas where
recirculation of discharge air may occur (refer to CLEARANCES
section of this document).
Roof--top installation is acceptable providing the roof will support
the unit and provisions are made for water drainage and
noise/vibration dampening.
NOTE: Roof mounted units exposed to wind may require wind
baffles. Consult the manufacturer for additional information.
CLEARANCES
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30 in. (762 mm)
clearance to service end of unit and 48 in. (1219 mm) above unit.
For proper airflow, a 6 in. (152 mm) clearance on 1 side of unit and
12 in. (305 mm) on all remaining sides must be maintained.
Maintain a distance of 24 in. (610 mm) between units or 18 in.
(457 mm) if no overhang within 12 ft. (7.3 m). Position so water,
snow, or ice from roof or eaves cannot fall directly on unit.
On rooftop applications, locate unit at least 6 in. (152 mm) above
roof surface.
Do not install unit under roof overhangs unless gutters are present.
A minimum vertical clearance of 48 inches (1219 mm) is required
to the overhang.
Inside corner locations on single story structures require
evaluation. Large overhanging soffit may cause air recirculation in
a corner area even though recommended minimum clearances are
maintained. As a guide, locate the unit far enough out so that half
of the discharge grille is out from under the soffit.
When placing two or more units side-- by--side, provide a minimum
of 18 inches (457 mm) between units.
Provide minimum service clearance of 24 inches (610 mm) from
control box corner and side service panel.
UNIT SUPPORT
NOTE: Unit must be level ± 2 degrees (3/8 inch rise or fall per
foot of run) or compressor may not function properly.
Ground Level
Installation
The unit must be level and supported above grade by beams,
platform, or a pad. Platform or pad can be of open or solid
construction but should be of permanent materials such as
concrete, bricks, blocks, steel, or pressure-- treated timbers
approved for ground contact. Soil conditions must be considered
so that the platform or pad does not shift or settle and leave the unit
partially supported. Minimum pad dimensions are shown in Fig.
1.
If beams or an open platform are used for support, it is
recommended that the soil be treated or area be graveled to reduce
the growth of grasses and weeds.
To minimize vibration or noise transmission, it is recommended
that supports not be in contact with the building structure.
However, slabs on grade constructions with an extended pad are
normally acceptable.
Roof Top
Installation
This type of installation is not recommended on wood frame
structures where low noise levels are required.
Supporting structure or platform for the unit must be level. If
installation is on a flat roof, locate unit minimum 6 inches 152
mm) above roof level.
Place the unit over one or more load bearing walls. If there are
several units, mount them on platforms that are self--supporting
and span several load bearing walls. These suggestions are to
minimize noise and vibration transmission through the structure. If
the structure is a home or apartment, avoid locating the unit over
bedrooms or study.
NOTE: When unit is to be installed on a bonded guaranteed roof,
a release must be obtained from the building owner to free the
installer from all liabilities.
Fastening Unit
down
If conditions or local codes require the unit be attached in place,
remove the knockouts in the base pan and install tie down bolts
through the holes (refer to Fig. 1).
Contact local distributor for hurricane hold--down details and the
P.E. (Professional Engineer) certification, when required.
!
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property
damage.
Inadequate unit support may cause excessive vibration,
noise, and/or stress on the refrigerant lines, leading to
refrigerant line failure.
3/8” Dia. Tie Down Knockouts
In Base Pan (2 places)
VIEW
FROM
A
Base Pan Width x
Depth
in. (mm)
25---3/4 x 26---5/16
(654 x 668)
31---3/16
(792)
35 x 36---9/16
(889 x 923)
TOP
Base Pan Width
Tie Down
Knockouts in. (mm)
A B C
4 --- 7 / 8
(124)
6 --- 9 / 1
9 --- 1 / 8
(232)
6
(167)
6-- 9/16
(167)
21---1/4
(540)
24--11/16
(627)
28--7/16
(722)
Mounting Pad
31---1/2 x 32 ---1/2
Depth
C
B
Minimum
Dimensions
in. (mm)
26 x 26--1/2
(660 x 673)
(800 x 826)
35 x 36--1/2
(889 x 927)
Base
Pan
A07586f
Fig. 1 --- Tie Down Knockouts
REFRIGERATION SYSTEM
A. COMPONENT MATCHES
Check to see that the proper system components are in place,
especially the indoor coil.
R--410A outdoor units can only be used with R --410A specific
indoor coils. If there is a refrigerant mis-- match, consult the indoor
coil manufacturer to determine if a refrigerant conversion kit is
available for the indoor coil.
This outdoor unit is designed for use only with indoor coils that
utilize a hard shut--off TXV refrigerant metering device. If any
other type of metering device is installed on the indoor coil, consult
the indoor coil manufacturer to determine if a hard shut--off TXV
conversion kit is available.
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Indoor coil and outdoor unit must be listed as a certified
combination (match) in the ARI Unitary Directory of
Certified Products. Indoor coil must have R --410A specific,
hard shut--off TXV refrigerant metering device.
CAUTION
2
When installing a hard shut--off TXV on an indoor coil, follow the
instructions provided with the new TXV.
A typical hard shut--off TXV installation is shown in Fig. 2.
INDOOR
SUCTION
TUBE
COIL
SUCTION
TUBE
LIQUID
TUBE
STRAP
A07587
EQUALIZER
TUBE
SENSING
BULB
HARD
SHUT OFF
TXV
SENSING BULB
(EITHER SIDE)
8 O’CLOCK 4 O’CLOCK
Fig. 2 --- Typical TXV Installation
B. REFRIGERANT LINE SETS
The refrigerant line set must be properly sized to assure maximum
efficiency and proper oil circulation. Select line set tube diameters
as specified in Table 1.
NOTE: Total line set length must not exceed 200 feet (61 m).
NOTE: A crankcase heater must be used when the refrigerant line
length exceeds 80 feet (24 m).
If outdoor unit is more than 10 feet (3 m) higher than the indoor
coil, refer to the Extended Length Refrigeration Piping Manual for
instructions.
NOTE: When the outdoor unit is higher than the indoor coil, the
vertical separation must not exceed 100 feet (31 m).
NOTE: When the outdoor unit is lower than the indoor coil, the
vertical separation must not exceed 50 feet (15 m).
If it is necessary to add refrigerant line in the field, use dehydrated
or dry, sealed, deoxidized, copper refrigeration tubing. Do not use
copper water pipe.
Do not remove rubber plugs or caps from copper tubing until
connections are ready to be made.
Be extra careful when bending refrigeration tubing. Tubing can
“kink” easily, and if this occurs, the entire length of tubing must be
replaced.
Table 1—R-- 410A Line Set Tube Diameter
(Liquid Tube Always 3/8” Dia.)
SERVICE VALVE
FITTINGS
MODEL SIZE
18 (12 ton)
24 (2 ton)
30 (22 ton)
36 (3 ton)
42 (32 ton)
48 (4 ton)
60 (5 ton) 7/8 1 --- 1 / 8 1 --- 1 / 8
NOTE: If the line set length exceeds 80 feet (24 m), also refer to Long Line
Application Guide for additional information.
(IN.)
Liquid Suction
5/8 5/8 3/4
3/8
3/4 3/4 7/8
7/8 7/8 1 --- 1 / 8
LINE SET
< 80 FEET
(24 M) LONG
Suction Line
Diameter
LINE SET
80 --- 200 FEET
( 2 4 --- 6 1 M )
LONG
Suction Line
Diameter (in.)
!
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 thatyou do not vent refrigerant
into the atmosphere. Recover during system repair or
final unit disposal.
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
product operation.
Do not leave system open to atmosphere any longer than
absolutely required for installation. Internal system
components -- especially refrigerant oils -- are extremely
susceptible to moisture contamination. Keep ends of tubing
sealed during installation until the last possible moment.
C. ROUTING AND SUSPENDING REFRIGERANT LINES
Run refrigerant lines as straight and direct as possible, avoiding
unnecessary bends and turns. Always insulate the entire suction
line. Both lines should be insulated when routed through an attic or
when routed through an underground raceway.
When routing refrigerant lines through a foundation or wall, do not
allow refrigerant lines to come in direct contact with the building
structure. Make openings large enough so that lines can be
wrapped with extra insulation. Fill all gaps with RTV caulk. This
will prevent noise transmission between the tubing and the
foundation or wall.
Along floor or ceiling joists, suspend refrigerant lines so that they
do not contact the building structure, water pipes, or ductwork. Use
insulated or suspension type hangers. Metal straps must be at least
1” wide to avoid cutting into the tube insulation. Keep the liquid
and suction lines separate. Refer to Fig. 3.
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
1” MIN
THROUGH THE WALL
SUSPENSION
LIQUID TUBE
SUCTION TUBE
JOIST
INSULATION
SUCTION TUBE
LIQUID TUBE
A07588
Fig. 3 --- Routing and Suspending Refrigerant Lines
3
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
product operation.
Do not bury more than 36” (914 mm) of line set
underground. Refrigerant may migrate to cooler buried
section during extended periods of unit shut--down, causing
refrigerant slugging and possible compressor damage at
start--up.If ANY section of the line set is buried
underground, provide a minimum 6” (152 mm) vertical rise
at the service valve.
D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT
Proper oil return to the compressor should be maintained with
suction gas velocity. If velocities drop below 1500 fpm (feet per
minute), oil return will be decreased. To maintain suction gas
velocity, do not upsize vertical suction risers. Use the “<80 feet (24
m)” suction line sizes shown Table 1.
Install oil traps every 20 feet (6 m) of vertical suction line riser.
E. LIQUID LINE FILTER--DRIER
Outdoor units are shipped with an appropriate filter--drier for
installation in the liquid line. Leave the plugs in the tube ends until
the filter-- drier is installed. The optimal location for the filter--drier
is close to the indoor coil. Install the filter--drier with the arrow
pointing towards the indoor coil. Refer to Fig. 4.
CAUTION
Braze joints using a Sil--Fos or Phos-- copper alloy.
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Braze with Sil-- Fos or Phos--copper alloy on
copper-- to--copper joints and wrap a wet cloth around rear
of fitting to prevent damage to TXV.
H. EVACUATING LINE SET AND INDOOR COIL
The unit is shipped with a factory refrigerant charge. The liquid
line and suction line service valves have been closed after final
testing at the factory. Do not disturb these valves until the line set
and indoor coil have been evacuated and leak checked, or the
charge in the unit may be lost.
NOTE: Do not use any portion of the factory charge for purging
or leak testing. The factory charge is for filling the system only
after a complete evacuation and leak check has been performed.
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Never use the outdoor unit compressor as a vacuum pump.
Doing so may damage the compressor.
CAUTION
CAUTION
A05227
Fig. 4 --- Liquid Line Filter Drier Installed at Outdoor Unit
F. SERVICE VALVES
Service valves are closed and tube stubs are plugged from the
factory. Outdoor units are shipped with a refrigerant charge sealed
in the unit. Leave the service valves closed until all other
refrigerant system work is complete or the charge will be lost.
Leave the plugs in place until line set tubing is ready to be inserted.
Service valve bodies are brass and tube stubs are copper.
G. BRAZING CONNECTIONS
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Refrigerant and oil mixture could ignite and burn as it
escapes and contacts brazing torch. Make sure the refrigerant
charge is properly removed from both the high and low sides
of the system before brazing any component or lines.
Clean line set tube ends with emery cloth or steel brush. Remove
any grit or debris.
Insert line set tube ends into service valve tube stubs.
Apply heat absorbing paste or heat sink product between service
valve and joint. Wrap service valves with a heat sinking material
such as a wet cloth.
Line set and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. If deep
vacuum equipment is not available, the alternate triple evacuation
method may be used by following the specified procedure.
If vacuum must be interrupted during the evacuation procedure,
always break vacuum with dry nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum to 500 microns and a vacuum gauge capable of
accurately measuring this vacuum level. The deep vacuum method
is the most positive way of assuring a system is free of air and
water.
Watch the vacuum gauge as the system is pulling down. The
response of the gauge is an indicator of the condition of the system.
With no leaks in the system, allow the vacuum pump to run for 30
minutes minimum at the deep vacuum level.
Triple Evacuation Method
The triple evacuation method should only be used when system
does not contain any water in liquid form and vacuum pump is
only capable of pulling down to 28 inches (711 mm) of mercury.
Proceed as follows:
3. Pull system down to 28 inches (711 mm) of mercury and
allow pump to continue operating for an additional 15
minutes.
4. Close manifold valves or valve at vacuum pump and shut
off vacuum pump.
5. Connect a nitrogen cylinder and regulator to system and fill
with nitrogen until system pressure is 2 psig.
6. Close nitrogen valve and allow system to stand for 1 hour.
During this time, dry nitrogen will diffuse throughout the
system absorbing moisture.
7. Repeat this procedure.
8. After the final evacuate sequence, confirm there are no leaks
in the system. If a leak is found, repeat the entire process
after repair is made.
4
I. OPENING SERVICE VALVES
Outdoor units are shipped with a refrigerant charge sealed in the
unit. Opening the service valves releases this charge into the
system.
NOTE: Open the Suction service valve first. If the Liquid service
valve is opened first, oil from the compressor may be drawn into
the indoor coil TXV, restricting refrigerant flow and affecting
operation of the system.
Remove Suction service valve cap and insert a hex wrench into the
valve stem. Hold the valve body steady with an end--wrench and
back out the stem by turning the hex wrench counterclockwise.
Turn the stem until it just contacts the rolled lip of the valve body.
After the refrigerant charge has bled into the system, open the
Liquid service valve.
NOTE: These are not back--seating valves. It is not necessary to
force the stem tightly against the rolled lip.
The service valve cap is a primary seal for the valve and must be
properly tightened to prevent leaks. Make sure cap is clean and
apply refrigerant oil to threads and sealing surface on inside of cap.
Tighten cap finger tight and then tighten additional 1/6 of a turn (1
wrench flat) to properly seat the sealing surfaces.
J. GAUGE PORTS
Check for leaks at the schrader ports and tighten valve cores if
necessary. Install plastic caps finger tight.
ELECTRICAL WIRING
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to turn off the main (remote) electrical disconnect
device could result in personal injury or death.
Before installing, modifying or servicing system, turn OFF
the main (remote) electrical disconnect device. There may be
more than one disconnect device.
The supply voltage must be 208/230 volts (197 volt minimum to
253 volts maximum) 60 Hz single phase.
Outdoor units are approved for use with copper conductors only.
Do not use aluminum wire.
Refer to unit rating plate for minimum circuit ampacity and circuit
protection requirements.
Grounding
Permanently ground unit in accordance with the National Electrical
Code and local codes or ordinances. Use a copper conductor of the
correct size from the grounding lug in control box to a grounded
connection in the service panel or a properly driven and electrically
grounded ground rod.
Wiring Connections
Make all outdoor electrical supply (Line Voltage) connections with
rain-- tight conduit and fittings. Most codes require a disconnect
switch outdoors within sight of the unit. Consult local codes for
special requirements.
Route electrical supply (Line Voltage) wiring through knockout
hole in bottom of Control Box. Connect wires to Contactor and
Ground Lug according to Wiring Diagram on unit. Also refer to
Fig. 5.
Route thermostat wiring through rubber grommet in bottom of
Control Box. Low voltage lead wires are provided in the control
box for connection to thermostat wires (use wire nuts). Refer to
Wiring Diagram on unit and Fig. 6 for low voltage wiring
examples.
NOTE: Use No. 18 AWG (American Wire Gage) color--coded,
insulated (35˚C minimum) wire. If thermostat is located more than
100 feet (30.5 m) from unit as measured along the control voltage
wires, use No. 16 AWG color-- coded wires to avoid excessive
voltage drop.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
FIELD POWER
WIRING
FIELD GROUND
WIRING
GROUND
LUG
A91056
Fig. 5 --- Electrical Supply (Line Voltage) Connections
R
C
WHEAT STAGE 1
Y
G
R
C
W2HEAT STAGE 1
Y
G
AIR CONDITIONER
C
AIR CONDITIONER
C
A07592
THERMOSTAT FURNACE
24 VAC HOT
24 VAC COM
COOL STAGE 1
INDOOR FAN
THERMOSTAT FAN COIL
24 VAC HOT
24 VAC COM
COOL STAGE 1
INDOOR FAN
R
C
W/W1
Y/Y2
G
R
C
W/W1
Y/Y2
G
Fig. 6 --- Typical Thermostat Connections
START--UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
3. If unit has a crankcase heater, energize the heater and wait
24 hours before proceeding.
4. Set indoor thermostat at desired temperature. Be sure
setpoint is below indoor ambient temperature or thermostat
will not call for cooling.
5. Set indoor thermostat selector switch to COOL. Operate
unit for minimum 10 minutes, then check the system
refrigerant charge.
5
REFRIGERANT CHARGE
Outdoor units are shipped with a refrigerant charge to match a
specific indoor coil and 15 feet (4.6 m) of refrigerant line. If
shorter or longer refrigerant lines or a different indoor coil are used,
the charge will have to be adjusted.
For different line lengths, add or remove charge based on 0.6
ounces charge per foot of difference. For example, a 25 foot (7.6
m) line set is 10 feet (3 m) longer than the specified 15 feet (4.6 m).
Add 0.6 ounces charge for each of the extra 10 feet:
10 x 0.6 = 6.0 ounces additional charge
This outdoor unit is designed for use only with indoor coils that
utilize a hard shut--off TXV refrigerant metering device. With a
hard shut--off indoor TXV, use the subcooling method to make
final charge adjustments:
Table 2—R-- 410A Required Liquid Line Temperature (_F)
MEASURED
LIQUID PRESSURE
(psig)
189 60 16 58 14 56 13 54 12 52 11 50 10
195 62 17 60 16 58 14 56 13 54 12 52 11
202 64 18 62 17 60 16 58 14 56 13 54 12
208 66 19 64 18 62 17 60 16 58 14 56 13
215 68 20 66 19 64 18 62 17 60 16 58 14
222 70 21 68 20 66 19 64 18 62 17 60 16
229 72 22 70 21 68 20 66 19 64 18 62 17
236 74 23 72 22 70 21 68 20 66 19 64 18
243 76 24 74 23 72 22 70 21 68 20 66 19
251 78 26 76 24 74 23 72 22 70 21 68 20
259 80 27 78 26 76 24 74 23 72 22 70 21
266 82 28 80 27 78 26 76 24 74 23 72 22
274 84 29 82 28 80 27 78 26 76 24 74 23
283 86 30 84 29 82 28 80 27 78 26 76 24
291 88 31 86 30 84 29 82 28 80 27 78 26
299 90 32 88 31 86 30 84 29 82 28 80 27
308 92 33 90 32 88 31 86 30 84 29 82 28
317 94 34 92 33 90 32 88 31 86 30 84 29
326 96 36 94 34 92 33 90 32 88 31 86 30
335 98 37 96 36 94 34 92 33 90 32 88 31
345 100 38 98 37 96 36 94 34 92 33 90 32
354 102 39 100 38 98 37 96 36 94 34 92 33
364 104 40 102 39 100 38 98 37 96 36 94 34
374 106 41 104 40 102 39 100 38 98 37 96 36
384 108 42 106 41 104 40 102 39 100 38 98 37
395 110 43 108 42 106 41 104 40 102 39 100 38
406 112 44 110 43 108 42 106 41 104 40 102 39
416 114 46 112 44 110 43 108 42 106 41 104 40
427 116 47 114 46 112 44 110 43 108 42 106 41
439 118 48 116 47 114 46 112 44 110 43 108 42
450 120 49 118 48 116 47 114 46 112 44 110 43
462 122 50 120 49 118 48 116 47 114 46 112 44
474 124 51 122 50 120 49 118 48 116 47 114 46
486 126 52 124 51 122 50 120 49 118 48 116 47
499 128 53 126 52 124 51 122 50 120 49 118 48
511 130 54 128 53 126 52 124 51 122 50 120 49
6 8 10 12 14 16
°F °C °F °C °F °C °F °C °F °C °F °C
RATING PLATE (REQUIRED) SUBCOOLING TEMPERATURE _F(_C)
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gauge to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type sensor or electronic thermometer to liquid
line near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Table 2. Find the required liquid line temperature
where the rating plate subcooling temperature intersects
measured liquid service valve pressure.
6. If the measured liquid line temperature is higher than the
chart number, add refrigerant to lower the measured
temperature.
NOTE: When adding refrigerant, charge in liquid form, using a
flow restricting device, into the suction port. If the measured liquid
line temperature is lower than the chart number, reclaim refrigerant
to raise the measured temperature. Tolerance is ±3˚F/1.65˚C.
6
SEQUENCE OF OP ERATION
With power supplied to indoor and outdoor units, transformer is
energized.
On a call for cooling, the thermostat makes circuits R --Y and R --G.
Circuit R--Y energizes contactor, starting outdoor fan motor and
compressor. Circuit R-- G energizes indoor unit blower relay,
starting indoor blower motor.
When thermostat is satisfied, its contacts open, de--energizing
contactor and blower relay. Compressor and motors stop.
NOTE: If indoor unit is equipped with a time--delay relay circuit,
the blower runs an additional length of time to increase system
efficiency.
MAINTENANCE
Condensate Drain
During the cooling season, check monthly for free flow of drainage
and clean if necessary.
Cleanliness
These tips will help keep the air conditioner looking better and
working more efficiently:
1. Free flow of air is essential. Keep fences, shrubs, trash cans,
and other obstructions at least 18 inches (457 mm) from all
coil inlets.
2. Keep the coil free of grass clippings, leaves, weeds, and
other debris.
NOTE: Coil may occasionally require cleaning with a
liquid solution. The coil must be cold when cleaning. Use
an alkaline based cleaner only. Cleaning a hot coil or using
an acid based cleaner will remove the paint from the fins
and may clog the coil.
3. Never use a weather cover over the outdoor unit unless it is
a ventilated type or made of breathable fabric that will allow
moisture to evaporate rapidly. A cover that holds moisture
in the unit will cause more rust build--up and damage than
normal exposure to weather.
7
R-- 410A REFRIGERANT QUICK REFERENCE GUIDE
S R--410A refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement
components are designed to operate with R-- 410A refrigerant.
S R--410A refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S R--410A refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose
when charging into suction line with compressor operating.
S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
S Use hoses with 700 psig service pressure rating.
S Leak detectors should be designed to detect HFC refrigerant.
S R--410A refrigerant, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid--line filter driers with rated working pressures less than 600 psig.
S Do not leave R--410A refrigerant suction line filter driers in line longer than 72 hours.
S Do not install a suction-- line filter drier in liquid --line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.
S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory--approved liquid--line filter drier is required on every unit.
S Do NOT use an R --22 TXV.
S If indoor unit is equipped with an R-- 22 TXV or piston metering device, it must be changed to a hard-- shutoff R--410A refrigerant
TXV.
S Never open system to atmosphere while it is under a vacuum.
S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.
S Do not vent R--410A refrigerant into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions,andbold text.
S All indoor coils must be installed with a hard--shutoff R--410A refrigerant TXV metering device.
Copyright 2007 Payne Heating & Cooling S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Printed in U.S.A. Edition Date: 06/07
C a t a l o g N o : I M --- P A 3 A --- PA 4 A --- 0 1
Replaces: New
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