CONDENSING AC UNIT
3-PHASE 7.5 & 10 TON AIR CONDITIONER
INSTALLATION & SERVICE REFERENCE
NOTICE
THIS UNIT IS SHIPPED WITH A NITROGEN/HELIUM HOLDING CHARGE ONLY. UNIT
MUST BE EVACUATED AND CHA RGED PER INSTALL AT ION INSTRUCT IO NS W IT H
REFRIGERANT LISTED ON SERIAL RATING PLATE.
NOTICE
UNITS SHIPPED WITH A HOLDING CHARGE ARE INTENDED FOR COMPONENT
REPLACEMENT ONLY ON EXISTING SYSTEMS, AND NOT INTENDED FOR USE IN
NEW SYSTEMS OR NEWLY CONSTRUCTED HOMES.
NOTICE
UNITS MUST ONLY BE USED AS REPLACEMENT COMPONENTS FOR PRE-2010
INSTALLED SYSTEMS.
© 2010 Goodman Manufacturing Company, L.P.
5151 San Felipe, Suite 500, Houston, TX 77056
www.goodmanmfg.com -or- www.amana-hac.com
P/N: IO-404 Date: November 2010
Important Safety Instructions
The following symbols and labels are used throughout this
manual to indicate immediate or potential safety hazards. It is
the owner’s and installer’s responsibility to read and comply
with all safety information and instructions accompanying these
symbols. Failure to heed safety information increases the risk
of personal injury, property damage, and/or product damage.
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
ONL Y individuals meeting the requirements of an
“Entry Level T echnician”, at a minimum, as specified
by the Air Conditioning, Heating and Refrigeration
Institute (AHRI) may use this information. Attempting
to install or r epair this u nit with out such backg round
may r esu lt i n p rod u ct dam age , per son al inj ur y,
or death.
Shipping Inspection
Always keep the unit upright; laying the unit on its side or top
may cause equipment damage. Shipping damage, and subsequent investigation is the responsibility of the carrier. Verify
the model number, specifications, electrical characteristics,
and accessories are correct prior to installation. The distributor or manufacturer will not accept claims from dealers for transportation damage or installation of incorrectly shipped units.
Codes & Regulations
This product is designed and manufactured to comply with
national codes. Installation in accordance with such codes and/
or prevailing local codes/regulations is the responsibility of the
installer. The manufacturer assumes no responsibility for equipment installed in violation of any codes or regulations.
The United States Environmental Protection Agency (EPA)
has issued various regulations regarding the introduction and disposal of refrigerants. Failure to follow these
regulations may harm the environment and can lead to
the imposition of substantial fines. Should you have any
questions please contact the local office of the EPA.
If replacing a condensing unit or air handler, the system must
be manufacturer approved and Air Conditioning, Heating and
Refrigeration Institute (AHRI) matched.
Refer to the unit Specification Sheet for the recommended indoor model selection. NOTE: This unit must be used with a
purchased single stage room thermostat with 24 VAC control
circuitry.
Do not operate the unit in a structure that is not complete
(either as part of new construction or renovation). Such operation will void the warranty.
Installation Clearances
This unit is designed for outdoor installations only. Special
consideration must be given to location of the condensing unit(s)
in regard to structures, obstructions, other units, and any/all
other factors that may interfere with air circulation. Where
possible, the top of the unit should be completely unobstructed;
however, if vertical conditions require placement beneath an
obstruction there should be a minimum of 60 inches be-
tween the top of the unit and the obstruction(s). The specified dimensions meet requirements for air circulation only.
Consult all appropriate regulatory codes prior to determining
final clearances.
Another important consideration in selecting a location for the
unit(s) is the angle to obstructions. Either side adjacent the
valves can be placed toward the structure provided the side
away from the structure maintains minimum service clearance.
Corner installations are strongly discouraged.
60"
12"
24"
12"
This unit can be located at ground floor level or on flat roofs. At
ground floor level, the unit must be on a solid, level foundation
that will not shift or settle. To reduce the possibility of sound
transmission, the foundation slab should not be in contact with
or be an integral part of the building foundation. The foundation
slab should be a minimum of 6” wider than the unit in all directions. Ensure the foundation is sufficient to support the unit. A
concrete slab raised above ground level provides a suitable
base.
The selected site should be no greater than 50’ below or 70’
above the evaporator section. For optimum performance, the
minimum length interconnecting tubing is preferred. When possible minimize the amount of bends and turns.
Rooftop Installations
If it is necessary to install this unit on a roof structure, ensure
the roof structure can support the weight and that proper consideration is given to the weather-tight integrity of the roof. Since
the unit can vibrate during operation, sound vibration transmission should be considered when installing the unit. Vibration
absorbing pads or springs can be installed between the condensing unit legs or frame and the roof mounting assembly to
reduce noise vibration.
Rigging
To avoid possibl e injury or death, all panels m us t be
in position and secured before lifting this equipment
Use field-supplied spreader bars when lifting the unit to minimize the possibility of lifting cable/straps damage. To protect
the cabinet louvers, use protective material such as plywood
behind the cable/straps. Arrange the straps to form a central
suspension point. NOTE: When raising and setting the unit,
observe all safety rules. Remove shipping skid and all protection and lifting material after the unit is in place.
Safe Refrigerant Handling
While these items will not cover every conceivable situation,
they should serve as a useful guide.
WARNING
Refrigerants are hea vier than air. They can "push out"
the oxygen in your lungs or in any enclosed space.To
avoid possible difficulty in breathing or death:
•
Never purge refrigerant into an enclosed room or
space. By law, all refrigerants must be reclaimed.
•
If an indoor leak is suspected, throughly ventilate the
area befor e begi nning work.
• Liquid refrigerant can be very cold. To avoid possible
frostbite or blindness, avoid contact and wear gloves
and goggles. If liquid refrigerant does contact your
skin or eyes, seek medical help immediately.
• Always follow EPA regulations. Never burn refrig erant, as poisonous gas will be produced.
To avoid possibl e ex plosion:
Never apply flame or steam to a refrigerant cylinder.
•
If you must heat a cylinder for faster charging,
partially im merse it in warm water.
Never fill a cylinder mor e than 80% ful l of liquid re-
•
frigerant.
• Never add anything other than R-22 to an R-22 cy linder. The se r v ic e
equipment used must be listed or certified for the
type of refrigerant used.
• Store cylinders in a cool, dry place. Never use a cy linder as a p latf orm or a rolle r.
2
WARNING
To avoid possible explosion, use only returnable (not
disposable) service cylinders when removing refrigerant from a system.
• Ensure the cylinder is free of damage which could
lead to a leak or explosion.
• Ensure the hydrostatic test date does not excee d
5 years.
• Ensure the pressure rating meets or exceeds 400
lbs.
When in doubt, do not us e cylinder.
Refrigerant Lines
NOTE: For improved refrigerant management, equip the
evaporator coil with a field-supplied thermal expansion valve
(TXV) and the liquid line with a field-supplied liquid line solenoid.
Ensure the solenoid is installed as close as possible to the
evaporator coil to prevent refrigeration migration in the
compressor “OFF” cycle.
Use only refrigerant grade (dehydrated and sealed) copper tubing to connect the condensing unit with the indoor evaporator.
After cutting the tubing, install plugs to keep refrigerant tubing
clean and dry prior to and during installation. Tubing should
always be cut square keeping ends round and free from burrs.
Clean the tubing to prevent contamination.
Do NOT let refrigerant lines come in direct contact with plumbing, ductwork, floor joists, wall studs, floors, and walls. When
running refrigerant lines through a foundation or wall, openings
should allow for sound and vibration absorbing material to be
placed or installed between tubing and foundation. Any gap
between foundation or wall and refrigerant lines should be filled
with a pliable silicon-based caulk, RTV or a vibration damping
material. Avoid suspending refrigerant tubing from joists and
studs with rigid wire or straps that would come in contact with
the tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the suction line.
REFRIGERANT L INE LENGTH (ft)
Cond Unit
(Tons)
7 1/2 1 1/8 5/8 1 3/8 5/8 1 3/8 5/8
10 1 3/8 5/8 1 5/8 5/8 1 5/8 5/8
* Full rating line size
** Lines greater than 74 feet in length or vertical elevation
changes more than 50 feet
Servic e Manua l or contact your distributor for assistance.
0-24 25-49* 50-74**
Line Diameter (In. OD)
Suct Liq Suct Liq Suct Liq
refer to the Remote Cooling
Insulation is necessary to prevent condensation from forming
and dropping from the suction line. Armflex (or satisfactory
equivalent) with 3/8” min. wall thickness is recommended. In
severe conditions (hot, high humidity areas) 1/2” insulation may
be required. Insulation must be installed in a manner which
protects tubing from damage and contamination.
Where possible, drain as much residual compressor oil from
existing systems, lines, and traps; pay close attention to low
areas where oil may collect. NOTE: If changing refrigerant
types, ensure the indoor coil and metering device is compatible with the type of refrigerant being used; otherwise, the indoor coil must be replaced. To facilitate oil return to the compressor, a horizontal suction line should be pitched (1/2” per
10’ toward the condensing unit.
Filter Drier and Sight Glass
A liquid line filter drier is factory installed. Field-install the supplied sight glass/moisture indicator on the liquid line as close
as practical to the service valve.
Burying Refrigerant Lines
If burying refrigerant lines can not be avoided, use the following
checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines
in waterproof material (conduit or pipe) sealing the ends
where tubing enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab,
ensure lines are adequately protected and sealed.
3
Refrigerant Line Connections
NOTICE
THIS UNIT IS SHIPP ED WIT H A NITROGEN /H E LIU M
HOLDING CHAR GE ONLY. UNIT MUST BE
EVACUATED AN D CHA RGED PER INSTAL LA TIO N
INSTRUCTIONS WITH REFRIGERANT LISTED ON
SERIAL RATING PLATE.
Pressure test the system using dry nitrogen and soapy water
to locate leaks. If you wish to use a leak detector, charge the
system to 10 psi using the appropriate refrigerant then use
nitrogen to finish charging the system to working pressure then
apply the detector to suspect areas. If leaks are found, repair
them. After repair, repeat the pressure test. If no leaks exist,
proceed to system evacuation.
System Evacuation
NOTE: Holding charge must be removed before brazing. Open
service valves slowly to remove holding charge. Close valves
before brazing to prevent contaminants from entering system.
IMPORTANT: To avoid overheating the service valve, TXV
valve, or filter drier while brazing, wrap the component
with a wet rag, or use a thermal heat trap compound as
recommended by the compound manufacturer. Use a
brazing alloy of 2% minimum silver content. Do not use
flux.
1. The ends of the refrigerant lines must be cut square, deburred, cleaned, and be round and free from nicks or dents.
Any other condition increases the chance of a refrigerant
leak.
2. “Sweep” the refrigerant line with nitrogen or inert gas during brazing to prevent the formation of copper-oxide inside the refrigerant lines.
3. After brazing, quench the joints with water or a wet cloth
to prevent overheating of the service valve.
4. Ensure the filter drier paint finish is intact after brazing. If
the paint of the steel filter drier has been burned or chipped,
repaint or treat with a rust preventative. This is especially
important on suction line filter driers which are continually wet when the unit is operating.
NOTE: Be careful not to kink or dent refrigerant lines. Kinked
or dented lines will cause poor performance or compressor
damage.
Do NOT make final refrigerant line connection until plugs are
removed from refrigerant tubing.
NOTE: Before brazing, verify indoor piston size by checking
the piston kit chart packaged with indoor unit.
Leak Testing (Nitrogen or Nitrogen-Traced)
WARNING
To avoid the risk of fire or explosion, never use
oxygen, high pressure air or flammable gases for leak
testing of a refrigeration system.
Condensing unit liquid and suction valves are closed to contain
the charge within the unit. The unit is shipped with the valve
stems closed and caps installed.
WARNING
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause
proper ty damag e , pe rsonal injury or de a th.
NOTICE
THIS UNIT IS SHIPP ED WIT H A NITROGEN /H E LIU M
HOLDING CHAR GE ONLY. UNIT MUST BE
EVACUATED AN D CHA RGED PER INSTAL LA TIO N
INSTRUCTIONS WITH REFRIGERANT LISTED ON
SERIAL RATING PLATE.
NOTICE
UNITS SHIPPED WITH A HOLDING CHARGE ARE
INTENDED FOR COMPONENT REPLACEMENT
ONLY ON EXISTING SYSTEMS, AND NOT
INTENDED FOR USE IN NEW SYSTEMS OR NEWLY
CONSTRUCTED HOMES.
NOTICE
UNITS MUST ONLY BE USED AS REPLACEMENT
COMPONENTS FOR PRE-2010 INSTALLED
SYSTEMS.
NOTE: Holding charge must be removed before brazing.
1. Openservice valves before attaching vacuum pump.
2. Connect the vacuum pump with 250 micron capability to
the service valves.
3. Evacuate the system to 250 microns or less using suction and liquid service valves. Using both valves is necessary as some compressors create a mechanical seal
separating the sides of the system.
4. Close pump valve and hold vacuum for 10 minutes. Typically pressure will rise during this period.
WARNING
To avoid possible explosion, the line from the
nitrogen cylinder must include a pressure regulator
and a pressure relief valve. The pressure relief valve
must be set to open at no more than 150 psig.
4
5000
4500
4000
3500
MICRONS
3000
IN
2500
ACUUM
2000
V
1500
1000
500
0 1 2 3 4 5 6 7 8 9
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
MINUTES
LEAK(S)
PRESENT
10
• If the pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to
startup.
• If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or noncondensibles
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered check
for leaks as previously indicated and repair as necessary
then repeat evacuation.
• If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as necessary then repeat evacuation.
Refer to the Remote Condensing Unit Service Manual for more
detailed instructions on system evacuation, preliminary charge
adjustment, and final charge adjustment.
RATED
VOLTAGE
MINIMUM SUPPLY
VOLTAGE
MAXIMUM SUPPLY
VOLTAGE
208/230V 197 253
460V 414 506
The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protection. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the
correct wire gauge and length. The wire size must be sufficient
to carry the Minimum Circuit Ampacity (MCA) listed on the
serial plate.
The supply voltage can be unbalanced (phase to phase) within
2%. The following formula can be used to determine the percentage of voltage unbalance for your unit.
Percentage
Voltage
Unbalance
Max. Voltage Deviation Form
=
Average Voltage
Average Voltage
Example:
L1-L2 = 220V
L2-L3 = 216V
Average Voltage = (220 + 216 + 213)/3
=649/3
Maximum Deviation from Average = 220 - 216 = 4
% Voltage Unbalance = 100 x (4/216)
= 400/216
Electrical Connections
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be presen t .
Failure to do so may c a us e propert y da m a ge,
personal injury or death due to electric shock.
Wiring must conform with NEC or CEC and all
local codes. Undersized wires could cause
poor equipment pe r formance, equipment damage
or fire.
WARNING
To avoid the risk of fire or equipment damage, us e
copper conductors.
NOTICE
Units with reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
This unit is designed for three phase operation. DO NOT OPERATE ON A SINGLE PHASE POWER SUPPLY. Measure
the power supply to the unit. The supply voltage must be in
agreement with the unit rating plate power requirements.
MAXIMUM ALLOWABLE LENGTH I N FEET
TO LIMIT VOLTAGE DROP TO 2%
Wire
Minim um Circuit Ampa city (MCA)
Size
(AWG)
10 15 20 25 30 35 40 45
14 75 50 37 NR NR NR NR NR
12 118 79 59 47 NR NR NR NR
10 188 125 95 75 63 54 NR NR
8 301 201 150 120 100 86 75 68
6 471 314 235 188 157 134 118 110
*Based on NEC 1996
5
Example:
A
7 ½ Ton unit is to be installed. The distance from the
building to the unit is 75’. Calculate the minimum wire size
assuming no more than 2% voltage drop.
MCA for 7 Ton 230V unit = 43.3 (from S&R plate).
½
Applying previous table wire s izes less than #8 AWG
cannot be used for circuits which have a rating of 45A.
The #8 wire is not suitable since the maximum length for
a 45A circuit is 68’.
Solution: Use a #6 AWG wire suitable up to 110’.
NOTE: It is the contractors’s responsibility to follow the
NEC (USA) or CEC (Canada) when sizing the service
wire for this unit.
To correct, disconnect power and switch any two leads at the
unit contactor and re-observe.
High Voltage Connections
Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram provided inside the control panel cover.
Low Voltage Connections
Condensing unit control wiring requires a two-conductor low
voltage circuit from the room thermostat. The wiring should be
no smaller than 18 AWG and the field connection for this circuit must be made in the unit control box using solderless
connectors (i.e. wire nuts). See the following diagram for a
typical low voltage hook-up.
SINGLE STATE LOW VOLTAGE HOOK-UP
Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installation instructions supplied with the indoor furnace/air handler for
specific wiring connections and indoor unit configuration. Likewise, consult the instructions packaged with the thermostat
for mounting and location information.
Overcurrent Protection
The following overcurrent protection devices are approved for
use.
• Time delay fuses
• HACR type circuit breakers
These devices have sufficient time delay to permit the motorcompressor to start and accelerate its load.
Refer to the unit serial plate and this table for the maximum
overcurrent protection permitted.
Run all line voltage wiring a conduit from the service disconnect box to the unit. Refer to the NEC (USA) or CEC (Canada)
codes for the correct size conduit based on the wire size. The
conduit enters the control box through the hole provided in the
bottom. NOTE: The control box hole is sized for 3/4” conduit. If
permitted by code, a flexible conduit is preferred to minimize
vibration transmission from the unit to the building.
Connect the line voltage wires to the L1, L2, and L3 terminals
of the definite purpose contactor (located in the unit control
box). Refer to the wiring diagram attached to the unit when
making these connections.
THERMOSTAT CH T18-60
Y1
RG
W1
AIR
HANDLER
AH090/120
CONDENSING
UNIT
CKL090/120
YELLOW
BLACK
BLUE BLUE
NOTES:
1). THERMOSTA T TO A IR HANDLE R CABLE
MUST HAVE A MINIMUM OF (4) CONDUCT ORS
2). AIR HANDLER TO CONDENSING UNI T CABLE
MUST HAVE A MINIMUM OF (2) CONDUCT ORS
GREEN
RED
WHITE
WIRE NUT
System Start Up
Never operate the compressor with the suction valve closed to
test the compressor’s pumping efficiency. In some cases, this
can result in serious compressor damage and loss of warranty
coverage.
NOTICE
THIS UNIT IS SHIPP ED WIT H A NITROGEN /H E LIU M
HOLDING CHAR GE ONLY. UNIT MUST BE
EVACUATED AN D CHA RGED PER INSTAL LA TIO N
INSTRUCTIONS WITH REFRIGERANT LISTED ON
SERIAL RATING PLATE.
Three Phase Compressor Rotation
CAUTION
Use care when handling scroll compressors. Dome temperatures could be hot.
Three phase scrolls are power phase dependent and can compress in more than one direction.
Verify proper rotation for three phase compressors by ensuring
the suction pressure drops and discharge pressure rises when
the compressor is energized. NOTE: When operated in reverse, a three phase scroll compressors is noisier and its current draw substantially reduced compared to marked values.
NOTICE
UNITS SHIPPED WITH A HOLDING CHARGE ARE
INTENDED FOR COMPONENT REPLACEMENT
ONLY ON EXISTING SYSTEMS, AND NOT
INTENDED FOR USE IN NEW SYSTEMS OR NEWLY
CONSTRUCTED HOMES.
NOTICE
UNITS MUST ONLY BE USED AS REPLACEMENT
COMPONENTS FOR PRE-2010 INSTALLED
SYSTEMS.
6
For the 7-1/2 ton unit starting charge should be 15 lb of R-22
and 18 lbs for the 10 ton unit. The length of line set, indoor unit
airflow, condensing unit location and number of tubing fittings
will have an impact on final unit charge amount. Turn the electrical power on, and let the system run. Wait for the refrigerant
pressures to stabilize.
Charge V erification
WARNING
REFRIGERANT UNDER PRESSURE!
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pres sure.
Failure to follow proper procedures may cause
proper ty damag e, pe rsonal injury or death.
CAUTION
Use refrige ra nt cert if ied to AHRI standards. Us e of use d
refriger ant ma y ca us e co m p res s or da ma g e tha t is not
covered under warranty . Mo st po rtab l e mac h ine s cann o t
clean used refri ger a nt to meet AHRI standa rd s .
c. If subcooling and superheat are high, adjust TXV
valve to 9 ± 1 ºF superheat, then check subcooling.
d. If subcooling is high and superheat is low, adjust
TXV valve to 9 ± 1 ºF superheat and remove charge
to lower the subcooling to 11 ± 2ºF.
NOTE: Do NOT adjust the charge based on suction pressure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
Subcooling Formula = Sat. Liquid Temp. - Liquid Line Temp.
NOTE: Check the Schrader ports for leaks and tighten valve
cores if necessary. Install caps finger-tight.
NOTE: Subsequent opening and replace of the cap will require
only 1/2 to 1 hex flat. See the table below for the torque required
for an effective seal on the valve bonnet (1/6 turn past finger
tight.
TUBING SIZE
5/8 14
1 3/ 8 16
TORQUE
(ft-lbs)
NOTICE
Violation of EPA regulations may result in fines or other
penalties.
CAUTION
Operating the compressor with the suction valve closed
may cause serious compressor damage.
Final Charge Adjustment
The outdoor temperature must be 60°F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the temperature control well below room temperature.
After system has stabilized per startup instructions, check
subcooling and superheat as detailed in the following section.
Expansion Valve System
1. Purge gauge lines. Connect service gauge manifold
tobase-valve service ports. Run system at least 10 minutes to allow pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line service valve with adequate contact and insulate for best possible reading.
3. Check subcooling and superheat. Systems with TXV application should have a subcooling of 11 ± 2 ºF and superheat of 9 ± 1 ºF.
a. If subcooling and superheat are low, adjust TXV
to 9 ± 1 ºF superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clock-
wise to increase and counter clockwise to decrease.
b. If subcooling is low and superheat is high, add
charge to raise subcooling to 11 ± 2ºF then check
superheat.
After closing the valve bonnet, perform a final refrigerant leak
test on the valves and sweat connections. Return the room
thermostat to the desired settings.
Troubleshooting
Qualified Installer/Servicer Only
When troubleshooting, the first step should always be to check
for clean coils, clean filter(s), and proper airflow. Indoor airflow
should be 375 to 425 CFM per ton of cooling based on the size
of the outdoor unit. The most common way of establishing
indoor airflow is heating temperature rise. Indoor airflow will
then be (Heating output of equipment) / (1.1 x temp. rise). In
other cases, measurement of external static pressure is helpful. For details, see the Installation Instructions for your indoor
unit.
7
TROUBLESHOOTING ANALYSIS T ABLE
COMPLAINT PROBABLE CAUSE REMEDY
1. Excessive charge of refrigerant in system. 1. Purge or pump-down excessive charge.
2. Inadequate supply of air across the 2. Make certain that coil is not foul ed in any
1. H igh Hea d Pressure
2. Low Head Pressure
3. Low Suction Pressure
4. High Suction Pressure
5. C omp res sor wi ll not s tart.
condenser coil. way, or that air is not re- circulating.
3. Non-condensate gases in the system. 3. Purge these gases from the system.
Recharge system, if necessary.
1. System low on refrig erant. 1. Charge system until sight glass is clear of bubbles.
2. Compressor valves broken. 2. Replace compressor.
1. Liquid line valve closed. 1. Open the liquid line valve.
2. Restricted liquid line. 2. Replace filter-dryer.
3. The bulb of the thermal expansion valve 3. Detach the bulb from the suction line and hold
has lost its charge. in one hand. If no liquid refrigerant goes through
the valve, repla ce the valve.
4. System low on refrigerant. 4. Test the unit for leaks. Add refrigerant until sight
glass is free from bubbles, after repairing leak.
5. Dirty filters. 5. Clean or replace filter.
6. Coil frosted up. 6. Defrost and clean coil. Clean or replace filters.
7. Flash gas in the liquid line. 7. Excessive liquid line drop. Check liquid line size.
8. Quantity of air through evaporator not adequate. 8. Increase the blower speed.
1. Expansion val ve stuck open. 1. Correct valve action or replace the valve.
2. Expansion valve bulb not in contact with 2. Fasten bulb securely to suction line.
suction line.
3. Suction and/or discharge valve leaking or broken. 3. Replace compressor.
1. Disconnect switch open. 1. Close the disconnect switch.
2. Blow fuse or fuse at disconnect switch. 2. Check the cause of failure and replace the fuse.
3. Thermostat set too high. 3. Adjust to lower temperature.
4. Selector switch in "Off" position. 4. Turn selector switch knob to "Cool" position.
5. Contactor and/or relay coils burned out. 5. Replace contactor and/or relay.
6. Loose or open electrical connection in either 6. Inspect and secure all electrical connections.
the control or power circuit.
Wiring Diagram
HIGH VOLTAGE!
ISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT
D
ULTIPLE POWER SOURCES MAY BE PRESENT
M
CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH
. F
AILURE TO DO SO MAY
.
.
8
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