PACKAGE AIR CONDITIONERS FEATURING EARTH-FRIENDLY
R410A REFRIGERANT
PCG SERIES 6, 7.5, 8.5, 10 & 12.5 TON [21.1, 26.4, 29.9, 35.2 & 44 kW]
60 HZ MODELS
[] Designates Metric Conversions
Recognize this symbol as an indication of Important Safety Information!
!
DO NOT DESTROY
PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE
FOR FUTURE REFERENCE.
WARNING
!
THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT AND OPERATION OF THIS UNIT. READ
THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING
INSTALLATION OR OPERATION. FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION,
ADJUSTMENT, SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
THE MANUFACTURER’S WARRANTY DOES NOT COVER
ANY DAMAGE OR DEFECT TO THE AIR CONDITIONER
CAUSED BY THE ATTACHMENT OR USE OF ANY COMPONENTS, ACCESSORIES OR DEVICES (OTHER THAN
THOSE AUTHORIZED BY THE MANUFACTURER) INTO,
ONTO OR IN CONJUNCTION WITH THE AIR CONDITIONER. YOU SHOULD BE AWARE THAT THE USE OF UNAUTHORIZED COMPONENTS, ACCESSORIES OR DEVICES
MAY ADVERSELY AFFECT THE OPERATION OF THE AIR
CONDITIONER AND MAY ALSO ENDANGER LIFE AND
PR O PERTY . THE MANUF A CTUR E R DIS C LAIM S ANY
RESPONSIBILITY FOR SUCH LOSS OR INJURY RESULTING FROM THE USE OF SUCH UNAUTHORIZED COMPONENTS, ACCESSORIES OR DEVICES.
This booklet contains the installation and operating instructions
for your air conditioner. There are a few precautions that
should be taken to d erive maximum satisfaction from it.
Improper installation can result in unsatisfactory operation or
dangerous conditions.
Read this booklet and any instructions packaged with separate
equipment required to make up the system prior to installation.
Give this booklet to the owner and explain its provisions. The
owner should retain this booklet for future reference.
III. CHECKING PRODUCT RECEIVED
Upon receiving the unit, inspect it for any damage from shipment. Claims for damage, either shipping or concealed, should
be filed immediately with the shipping company. Check the unit
model number, heating size, electrical characteristics, and
ccessories to determine if they are correct.
a
IV. EQUIPMENT PROTECTION FROM THE
ENVIRONMENT
The metal parts of this unit may be subject to rust or deterioration in adverse environmental conditions. This oxidation could
shorten the equipment’s useful life. Salt spray, fog or mist in
seacoast areas, sulphur or chlorine from lawn watering systems, and various chemical contaminants from industries such
as paper mills and petroleum refineries are especially corrosive.
If the unit is to be installed in an area where contaminants
are likely to be a problem, special attention should be
given to the equipment location and exposure.
1. Avoid having lawn sprinkler heads spray direction on the
unit cabinet.
2. In coastal areas, locate the unit on the side of the building
away from the waterfront.
3. Shielding provided by a fence or shrubs may give some
protection.
Regular maintenance will reduce the buildup of contaminants and help to protect the unit’s finish.
!
WARNING
DISCONNECT ALL POWER TO THE UNIT BEFORE STARTING MAINTENANCE. FAILURE TO DO SO CAN RESULT IN
SEVERE ELECTRICAL SHOCK OR DEATH.
1. Frequent washing of the cabinet, fan blade and coil with
fresh water will remove most of the salt or other contaminants that build up on the unit.
2. Regular cleaning and waxing of the cabinet with a good
automobile polish will provide some protection.
3. A good liquid cleaner may be used several times a year to
remove matter that will not wash off with water.
Several different types of protective coatings are offered in
some areas. These coatings may provide some benefit, but the
effectiveness of such coating materials cannot be verified by
the equipment manufacturer.
The best protection is frequent cleaning, maintenance and
minimal exposure to contaminants.
V. SPECIFICATIONS
A. GENERAL
The Packaged Air Conditioner is available without heat or with
10, 15, 20, 30, 40 or 50 kW electric heat. Cooling capacities of
1
⁄2 , 81⁄2 , 10 and 121⁄2 nominal tons of cooling are available.
6, 7
Units are convertible from horizontal supply and return to bottom supply and return by relocation of supply and return air
access panels. See cover installation detail.
2
The units are weatherized for mounting outside of the building.
The information on the rating plate is in compliance with the
FTC and DOE rating for single phase units. The following information is for three phase units which are not covered under
he DOE certification program.
t
1. The efficiency rating of this unit is a product thermal efficiency rating determined under continuous operating conditions independent of any installed system.
B. MAJOR COMPONENTS
The unit includes a hermetically-sealed refrigerating system
(consisting of a compressor, condenser coil, evaporator coil
with thermal expansion valve), a circulation air blower, a condenser fan, and all necessary internal electrical wiring. The
cooling system of these units is factory-evacuated, charged
and performance tested. Refrigerant amount and type are indi-
ated on rating plate.
c
C. R-410A REFRIGERANT
All units are factory charged with R-410A refrigerant.
1. Specification of R-410A:
Application: R-410A is not a drop-in replacement for R-22
equipment designs must accommodate its higher pressures. It
cannot be retrofitted into R-22 units.
Pressure: The pressure of R-410A is approximately 60%
(1.6 times) greater than R-22. Recovery and recycle equip-
ment, pumps, hoses and the like need to have design pressure
ratings appropriate for R-410A. Manifold sets need to range up
to 800 psig high-side and 250 psig low-side with a 550 psig
low-side retard. Hoses need to have a service pressure rating
of 800 psig. Recovery cylinders need to have a 400 psig service pressure rating. DOT 4BA400 or DOT BW400.
Combustibility: At pressures above 1 atmosphere, mixture of
R-410A and air can become combustible. R-410A and air
should never be mixed in tanks or supply lines, or be
allowed to accumulate in storage tanks. Leak checking
should never be done with a mixture of R-410A and air.
Leak checking can be performed safely with nitrogen or a mixture of R-410A and nitrogen.
• R-410A refrigerant cylinders are pink.
R-410A, as with other HFC’s is only compatible with POE
•
oils.
• Vacuum pumps will not remove moisture from POE oil.
• R-410A systems are to be charged with liquid refrigerants.
Prior to March 1999, R-410A refrigerant cylinders had a dip
tube. These cylinders should be kept upright for equipment
charging. Post March 1999 cylinders do not have a dip tube
and should be inverted to ensure liquid charging of the
equipment.
• Do not install a suction line filter drier in the liquid line.
• A liquid line filter drier is standard on every unit.
• Desiccant (drying agent) must be compatible for POE oils
and R-410A.
3. Evaporator Coil / TXV
The thermostatic expansion valve is specifically designed to
operate with R-410A. DO NOT use an R-22 TXV. The exist-
ing evaporator must be replaced with the factory specified
TXV evaporator specifically designed for R-410A.
;
4. Tools Required For Installing & Servicing R-410A Models
Manifold Sets:
-Up to 800 PSIG High side
-Up to 250 PSIG Low Side
-550 PSIG Low Side Retard
Manifold Hoses:
-Service Pressure Rating of 800 PSIG
Recovery Cylinders:
-400 PSIG Pressure Rating
-Dept. of Transportation 4BA400 or BW400
!
CAUTION
R-410A systems operate at higher pressures than R-22 systems. Do not use R-22 service equipment or components on R410A equipment.
2. Quick Reference Guide For R-410A
• R-410A refrigerant operates at approximately 60% higher
pressure (1.6 times) than R-22. Ensure that servicing equipment is designed to operate with R-410A.
3
FIGURE 1
NIT DIMENSIONS
U
[
COMPRESSOR
ACCESS
3
0
4
⁄16”
1020.7 mm]
3
1
3
⁄16”
[96.8 mm]
UPPLY COVER
S
1
1
3
9
⁄16”
2379.6 mm]
[
OWER
P
E
3
[44.5 mm]
⁄4”
1
ONTROL
C
ENTRY
7
⁄8” [22.2 mm]
NTRY
D
DIA.
5
⁄8”
6
168.3 mm]
[
1
4
⁄8”
[104.8 mm]
IA.
”
5
127 mm]
[
11
1
1
296.9 mm]
[
3
1
6
⁄16”
[173 mm]
⁄16”
FIGURE 2
UNIT DIMENSIONS
2”
[50.8 mm]
[1390.6 mm]
[ ] Designates Metric Conversions
4
543⁄4”
[265.1 mm]
107⁄16”
R
E
14”
[355.6 mm]
TURN
RETURN COVER
*
34”
[863.6 mm]
2”
[50.8 mm]
151⁄8”
[384.2 mm]
2”
[50.8 mm]
25”
[635 mm]
2”
[50.8 mm]
SUPPLY*
47⁄16”
[112.7 mm]
583⁄4”
[1492.2 mm]
23”
[584.2 mm]
8911⁄16”
[2278 mm]
*ACTUAL OPENING
DIMENSIONS
T-A1112-02-00
S
2”
[50.8 mm]
ST-A1112-01-00
FIGURE 3
SUPPLY RETURN DIMENSIONS FOR DOWNFLOW APPLICATIONS
25"
[635 mm]
14"
[355.6 mm]
34"
[863.6 mm]
8"
[203.2 mm]
THRU THE BASE ELECTRIC
54"
[1371.6 mm]
23"
[585.5 mm]
UNIT DIMENSIONS
CONTROL ENTRY
[2379.7 mm]
.020”
7
178.3 mm]
[
93.688”
GAUGE PORT
CONNECTIONS
.625”
5
142.9 mm]
[
7.268”
2
692.6 mm]
[
33.715”
[805.5 mm]
8.75”
5
1487.7 mm]
[
ELECTRIC HEAT
POWER ENTRY
ONDENSATE DRAIN
C
” [25.4 mm] FNPT
1
CONTROL/FILTER
ACCESS
ACCESS
4”
4
1117.6 mm]
[
C
BOTH SIDE SOME MODELS)
(
LOWER ACCESS
B
OMPRESSOR
CCESS
A
A0737-03
FIGURE 4
BOTTOM VIEW
3
/4”
58
[1492.2 mm]
A0712-02
1
1
93
/16”
[2379.4 mm]
88
[2259 mm]
3
2
/8”
[60.3 mm]
[112.7 mm]
15
/16”
1
/8”
15
[384.1 mm]
7
/16”
4
21/8”
[54 mm]
1
/2”
27
[698.5 mm]
7
/16”
4
[112.7 mm]
107/16”
[265.1 mm]
1
/8”
2
[54 mm]
61/2”
[165.1 mm]
5
*26"
[660.4 mm]
12"
[304.8 mm]
4
4"
[
1117.6 mm]
3
4"
[
863.6 mm]
14"
[355.6 mm]
28"
[711.2 mm]
S
UPPLY AND RETURN DIMENSIONS FOR HORIZONTAL APPLICATION
S
UPPLY DUCT MAY EXTEND UP TO THIS LEVEL
FIGURE 5
REAR VIEW
7
7
/32”
[183.3 mm]
93
*RECOMMENDED DUCT DIMENSIONS ARE 26”
[2379.6 mm]
5
13
/8”
[346 mm]
6
1
1
1
/
”
[112.7 mm]
47/16”
0714-03
A
6
GENERAL DATA - PCG
CONTINUED
NOM. SIZES 6-12
Model PCG- Series072A-3L072A-4L085A-3L085A-4L
Cooling Performance
Gross Cooling Capacity Btu [kW]76,000 [22.27]76,000 [22.27]88,000 [25.78]88,000 [25.78]
EER/SEER
Nominal CFM/ARI Rated CFM [L/s]2400/2375 [1133/1121]2400/2375 [1133/1121]2800/3000 [1321/1416]2800/3000 [1321/1416]
ARI Net Cooling Capacity Btu [kW]73,000 [21.39]73,000 [21.39]85,000 [24.9]85,000 [24.9]
Net Sensible Capacity Btu [kW]53,900 [15.79]53,900 [15.79]66,100 [19.37]66,100 [19.37]
Net Latent Capacity Btu [kW]19,100 [5.6]19,100 [5.6]18,900 [5.54]18,900 [5.54]
Integrated Part Load Value
Net System Power kW6.316.317.537.53
FurnishedYesYesYesYes
(No.) Size Recommended in. [mm x mm x mm] (6)2x18x18 [51x457x457](6)2x18x18 [51x457x457](6)2x18x18 [51x457x457](6)2x18x18 [51x457x457]
Refrigerant Charge Oz. [g]120 [3402]120 [3402]190.9 [5412]190.9 [5412]
Weights
FurnishedYesYesYesYes
(No.) Size Recommended in. [mm x mm x mm] (6)2x18x18 [51x457x457](6)2x18x18 [51x457x457](6)2x18x18 [51x457x457](6)2x18x18 [51x457x457]
Refrigerant Charge Oz. [g]107.5/110.7 [3048/3138]107.5/110.7 [3048/3138]154.4/166.6 [4377/4723]154.4/166.6 [4377/4723]
Weights
Before attempting any installation, the following points
should be carefully considered:
a. Structural strength of supporting members.
(rooftop installation)
b. Clearances and provision for servicing.
. Power supply and wiring.
c
d. Air duct connections.
e. Drain facilities and connections.
f. Location for minimum noise.
2. LOCATION
These units are designed for outdoor installations. They
can be mounted on a slab or rooftop. They are not to be
installed within any part of a structure such as an attic,
crawl space, closet, or any other place where condenser
air flow is restricted or other than outdoor ambient conditions prevail. Since the application of the units is of the
outdoor type, it is important to consult your local code
authorities at the time the first installation is made.
B. OUTSIDE SLAB INSTALLATION (Typical outdoor slab
installations are shown in Figures 6 and 7.)
1. Select a location where external water drainage cannot
collect around the unit.
2. Provide a level concrete slab extending 3" [76.2 mm]
beyond all four sides of the unit. The slab should be sufficient above grade to prevent ground water from entering the unit. IMPOR TANT: To prevent transmission of
noise or vibration, slab should not be connected to
building structure.
3. The location of the unit should be such as to provide
proper access for inspection and servicing.
4. Locate unit where operating sounds will not disturb
owner or neighbors.
5. Locate unit so roof runoff water does not pour directly on
the unit. Provide gutter or other shielding at roof level.
Do not locate unit in an area where excessive snow drifting may occur or accumulate.
C. CLEARANCES
The following minimum clearances must be observed for
proper unit performance and serviceability.
1. Provide 48" [1219.2 mm] minimum clearance at the front
of the unit. Provide 18" [457.2 mm] minimum clearance
at all other sides of the unit.
2. Provide 60" [1524 mm] minimum clearance between top
of unit and maximum 3 foot [.91 m] overhang.
3. Unit is design certified for application on combustible
flooring with 0" [0 mm] minimum clearance.
4. See Figure 6 for illustration of minimum installation-service clearances.
FIGURE 6
UTSIDE SLAB INSTALLATION, BASEMENT OR
O
RAWL SPACE DISTRIBUTION SYSTEM
C
Recommended
Clearance
48” [1219.2 mm]A - Front
18” [457.2 mm]B - Condenser Coil
18” [457.2 mm]C - Duct Side
18”* [457.2 mm]D - Evaporator End
60” [1524 mm]E - Above
*Without Economizer. 48” [1219.2 mm] With
*Economizer
Location
FIGURE 7
OUTSIDE SLAB INSTALLATION, CLOSET DISTRIBUTION
SYSTEM. SLAB FLOOR CONSTRUCTION
0741-03
A
12
A0739-03
D. ROOFTOP INSTALLATION
INSTALL GASKET
NAILING STRIP
DUCT FLANGE NOT
TO EXCEED 1" [25.4 mm]
SUPPLY DUCT
RETURN DUCT
CAULK ALL JOINTS
WATERTIGHT
ROOFCURB
UNIT
A
0
7
4
4
0
3
Illustration
A
074403
1. Before locating the unit on the roof, make sure that the
strength of the roof and beams is adequate at that point
to support the weight involved. This is very important
nd user’s responsibility.
a
2. For rigging and roofcurb details, see Figures 8 and 9.
Use field-furnished spreaders.
. For roofcurb assembly, see Roofcurb Installation Instruc-
3
tions.
4. If the roofcurb is not used, provisions for disposing of
condensate water runoff must be provided.
5. The unit should be placed on a solid and level roofcurb
or platform of adequate strength. See Figure 10.
. The location of the unit on the roof should be such as to
6
provide proper access for inspection and servicing.
IMPORTANT: If unit will not be put into service immediately,
cover supply and return openi ngs to prevent excessive condensation.
FIGURE 8
IGGING FOR LIFTING
R
CORNER WEIGHTS BY PERCENTAGE
ABCD
33%27%17%23%
FIGURE 9
ROOFCURB INSTALLATION
A0744-03
A0719-02
A0719-03
13
IGURE 10
F
LAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING
F
DISTRIBUTION SYSTEM. MOUNTED ON ROOFCURB.
URB MUST BE LEVEL
C
1112-03
A
VII. DUCTWORK
Ductwork should be fabricated by the installing contractor in
accordance with local codes and NFPA90A. Industry manuals
may be used as a guide when sizing and designing the duct
system - contact Air Conditioning Contractors of America, 1513
16th St. N.W., Washington, D.C. 20036.
WARNING
!
DO NOT, UNDE R AN Y CIR CUMS T ANCE S, C ONNE C T
RETURN DUCTWORK TO ANY OTHER HEAT PRODUCING
DEVICE SUCH AS A FIREPLACE INSERT, STOVE, ETC.
UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN
FIRE, CAR BON MONOXIDE POISONI NG, EXPLOSION,
PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR
DEATH.
The unit should be placed as close to the space to be air conditioned as possible allowing clearance dimensions as indicated.
Ducts should be run as directly as possible to supply and
return outlets. Use of non-flammable waterproof flexible connectors on both supply and return connections at the unit to
reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if
the registers or diffusers are located on the wall or in the ceiling. A slab installation could be considered when the registers
are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature
and humidity, use a minimum of 2" [50.8 mm] of insulation and
a vapor barrier. Distribution system in attic, furred space or
crawl space should be insulated with at least 2" [50.8 mm] of
insulation with vapor barrier. One-half to 1" [25.4 mm] thickness of insulation is usually sufficient for ductwork inside the air
conditioned space.
Balancing dampers should be provided for each branch duct in
the supply system. Ductwork should be properly supported
from the structure.
When installing ductwork, consider the following items:
1. Nonc ombu s tibl e fle xible conn ector s sho uld be us ed
between ductwork and unit to reduce noise and vibration
transmission into the ductwork.
2. When auxiliary heaters are installed, use noncombustible
lexible connectors and clearance to combustible material
f
of 0" [0 mm] for the first 3 feet [.91 m] of discharge duct.
Clearance to unit top and side is 0" [0 mm].
VIII. FILTERS
This unit is provided with 6 - 2" x 18" x 18" [51mm x 457 mm x
457 mm] disposable filters. When replacing filters, ensure they
are inserted fully to the back to prevent bypass.
VIX. CONVERSION PROCEDURE
DOWNFLOW TO HORIZONTAL
1. Remove the screws and covers from the outside of the
supply and return sections.
2. Install the covers over the bottom supply and return openings, painted side up inserting the leading flange under the
bracket provided. Place the back flange to the top of the
front bracket provided. See Figure 11.
3. Secure the return and supply cover to the front bracket with
one (1) screw.
FIGURE 11
COVER GASKET DETAIL
REAR PANEL
INSULATION
BACK
BRACKET
BASE PAN
NOTE: COVER SLIDES
UNDER BACK
BRACKET FLANGE.
SUPPLY OR RETURN COVER
FRONT BRACKET
INSULATION
BASE RAIL
NOTE: COVER FITS ON
TOP OF FRONT
BRACKET FLANGE.
A0725-01
14
X. CONDENSATE DRAIN
The c o ndensate d r ain conn e c t i on of t h e evapora t o r is
1" [25.4 mm] nominal female pipe thread. IMPORTANT: Install
a condensate trap to ensure proper condensate drainage. See
Figure 12.
IGURE 12
F
ONDENSATE DRAIN
C
3”
[76 mm]
3”
76 mm]
[
XI. ELECTRICAL WIRING
Field wiring must comply with the National Electrical Code (CEC
in Canada) and local ordinances that may apply.
A. POWER WIRING
1. This unit incorporates single-point electrical connections
for the unit and electric heat accessory.
2. It is important that proper electrical power is available to
the unit. Voltage should not vary more than 10% from the
values marked on the unit rating plate. Phase voltages
must be balanced within 3%.
3. Install a branch circuit disconnect within sight of the unit.
Use the unit rating plate or RLNL-B Electrical Data to
determine the required size.
4. The branch circuit wire must be sized in accordance with
the National Electrical Code (C.E.C. in Canada) and local
ordinances that may apply using the minimum circuit
ampacity found on the unit rating plate.
5. Field-installed power wiring must be run through grounded rain-tight conduit attached to the unit power entry
panel and connected as follows:
UNITS WITHOUT ELECTRIC HEAT - Connect power
wiring to the power terminal block located on the left side
of the electric heat compartment. Connect the ground
wire to the adjacent ground lug.
UNITS WITH FACTORY INSTALLED ELECTRIC HEAT -
Connect power wiring to the power terminal block located
on the electric heater kit. Connect the ground wire to the
adjacent ground lug. DO NOT connect aluminum wiring
directly to the electric heater terminal block. Wiring to the
unit contactors is factory-connected.
6. For field installation of an electric heater kit, follow the
instructions below. Refer to the information supplied with
the kit.
a. Removing screws as required, open heater access
door and detach adjacent power entry panel.
b. Remove wires to unit contactor (1L1, 1L2, 1L3) from
unit terminal block on the left side of the electric heat
compartment. Remove and discard the terminal block
and the adjacent ground lug.
c. Remove the heater kit block-off panel and install the
heater kit in its place using 9 of the 12 screws previously removed.
d. Connect the unit contactor wires (1L1, 1L2, 1L3) to the
compressor fuse block on the heater kit.
FIGURE 13
RANCH CIRCUIT DISCONNECT LOCATION
B
e. Re-install the power entry panel & run conduit and the
proper size field wiring through the opening in the
panel.
f. Connect field wiring to the power terminal block located
on the electric heater kit. Connect ground wire to the
adjacent ground lug.
g. Connect heater kit control plug to the receptacle on the
control wiring harness.
h. Close heater access door and secure with screws pre-
viously removed.
B. CONTROL WIRING (Class II)
1. Low voltage wiring should not be run in conduit with
power wiring.
2. Control wiring is routed through the 7/8" [22 mm] hole in
the unit side panel. See Figure 14. Use a minimum #18
AWG thermostat wire. For wire lengths exceeding 50'
[15.24 m] use #16 AWG thermostat wire. Connect the
control wiring to the low voltage terminal block located on
the unit integrated control. Route wires under the control
voltage shield. See Figure 14.
3. It is necessary that only approved thermostats be used.
Please contact your distributor for part number information. See thermostat specification catalog for recommended thermostat.
4. Figure 15 shows representative low voltage connection
diagrams. Read your thermostat installation instructions
for any special requirements for your specific thermostat.
C. INTERNAL WIRING
1. A diagram of the internal wiring of this unit is located on
the inside of the control access panel and in this manual.
If any of the original wiring must be replaced, the wire
gauge and insulation must be the same as original wiring.
Transformer is factory-wired for 220 volts on 200/220 volt
models and must be changed for 200-volt applications.
See unit wiring diagram for 200-volt wiring.
D. GROUNDING
WARNING
!
THE UNIT MUST BE PERMANENTLY GROUNDED. A
GROUNDING LUG IS PROVIDED IN THE ELECTRIC
HEAT ACCESS AREA FOR A GROUND WIRE. FAILURE
TO GRO UND THI S UNIT CAN RES ULT IN FIRE OR
ELECTRICAL SHOCK CAUSING PROPERTY DAMAGE,
SEVERE PERSONAL INJURY OR DEATH.
15
FIGURE 14
GR O UNDING MA Y A L S O B E A CCOMP L ISHED BY
GROUNDING THE POWER LI NE CO NDUIT TO THE
UNIT. MAKE SURE THE CONDUIT NUT LOCKING TEETH
HAVE PIERCED THE INSULATING PAINT FILM OF THE
SIDE PANEL.
E. THERMOSTAT
The thermostat should be mounted on an inside wall about
five feet above the floor in a location where it will not be
affected by unconditioned air, sun, or drafts from open doors
or other sources. READ installation instructions in air conditioner thermostat package CAREFULLY because each has
some different wiring requirements.
XII. INDOOR AIR FLOW DATA
Belt-drive blower models have motor sheaves set for proper
CFM at a typical external static. See Tables C through G for
blower performance.
16
XIII. CRANKCASE HEAT (OPTIONAL)
Crankcase heaters are standard on 6 ton and single stage 71⁄2.
Crankcase heat is not required on other models, but may be
desirable under certain conditions.
XIV. PRE-START CHECK
1. Is unit properly located and slightly slanted toward indoor
condensate drain?
2. Is ductwork insulated, weatherproofed, with proper spacing
to combustible materials?
3. Is air free to travel to and from outdoor coil? (See Figure 4.)
4. Is the wiring correct, tight, and according to unit wiring diagram?
5. Is unit grounded?
6. Are field supplied air filters in place and clean?
7. Do the outdoor fan and indoor blower turn freely without
rubbing, and are they tight on the motor shafts?
FIGURE 15
THERMOSTAT
CONNECTIONS
DIAGRAM
XV.STARTUP
1. Turn thermostat to “OFF,” turn “on” power supply at disconnect switch.
2. Turn temperature setting as high as it will go.
3. Turn fan switch to “ON.”
4. Indoor blower should run. Be sure it is running in the right
direction.
5. Turn fan switch to “AUTO.” Turn system switch to “COOL”
and turn temperature setting below room temperature. Unit
should run in cooling mode.
6. Is outdoor fan operating correctly in the right direction?
7. Is compressor running correctly.
Record the following after the unit has run some time.
A. Operating Mode _______________________________
B. Discharge Pressures (High) _____________PSIG [kPa]
C. Vapor Pressure at Compressors (Low) _____PSIG [kPa]
D. Vapor Line Temperature at Compressors ______°F [C°].
E. Indoor Dry Bulb __________________________°F [C°].
F. Indoor Wet Bulb __________________________°F [C°].
G. Outdoor Dry Bulb _________________________°F [C°].
H. Outdoor Wet Bulb ________________________°F [C°].
I. Voltage at Contactor ________________________Volts
J. Current at Contactors ______________________ Amps
K. Model Number_________________________________
L. Serial Number _________________________________
M.Location______________________________________
N. Owner _______________________________________
O. Date_________________________________________
A0823-01
8. Turn thermostat system switch to “HEAT.” Unit compressors should stop. Raise temperature setting to above room
temperature. Unit should run in heating mode and auxiliary
heaters, if installed, should come on.
9. Check the refrigerant charge using the instructions located
on unit charging chart. Replace service port caps. Service
port cores are for system access only and will leak if not
tightly capped.
10. Adjust discharge air grilles and balance system.
11. Check ducts for condensation and air leaks.
12. Check unit for tubing and sheet metal rattles.
13. Instruct the owner on operation and maintenance.
14. Leave “INSTALLATION” and ”USE AND CARE“ instructions with owner
17
XVI. OPERATION
COOLING MODE
With thermostat in the cool mode, fan auto and the room temperature higher than the thermostat setting:
A. Indoor blower contactor is energized through thermostat
contact (G).
B. Compressor contactors are energized through thermostat
contacts (Y1) & (Y2) and high pressure controls.
C. Economizer enthalpy control (if installed) controls operation
of first-stage cooling and positions fresh air damper to maintain mixed air temperature. Second-stage cooling operates
normally as required by second stage of thermostats.
. The system will continue in cooling operation as long as all
D
safety controls are closed, until the thermostat is satisfied.
HEATING MODE
With the thermostat in heat mode, fan on auto, and the room
temperature lower than the thermostat setting, the Indoor
blower contactor is energized through thermostat contact (G).
WARNING
!
ONLY ELECTRIC HEATER KITS SUPPLIED BY THIS MANUFACTURER AS DESCRIBED IN THIS PUBLICATION HAVE
BEEN DESIGNED, TESTED, AND EVALUATED FOR USE
WITH THIS UNIT. USE OF ANY OTHER MANUFACTURED
ELECTRIC HEATERS INSTALLED WITHIN THIS UNIT MAY
CAUSE HAZARDOUS CONDITIONS RESULTING IN PROPERTY DAMAGE, FIRE, BODILY INJURY OR DEATH.
In the heating mode, the thermostat will energize one or more
supplementary heaters.
XVII. MISCELLANEOUS
EPLACEMENT PARTS
R
ontact your local distributor for a complete parts list.
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
SYMPTOMPOSSIBLE CAUSEREMEDY
nit will not run• Power off or loose electrical connection• Check for correct voltage at compressor contactor in control
U
Thermostat out of calibration-set too high• Reset
•
Defective contactor• Check for 24 volts at contactor coil - replace if contacts are