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Air Conditioner
p/n: 1ACUNIT-G1
Fits with Curtis Roof Kit: Contact Curtis for Details.
Fits with Curtis Alternator Kit: Contact Curtis for Details.
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Product Specifications
25” x 36” x 7”
Weight: 47 lbs.
Air Flow: 260 CFM
Cooling Capacity: 12,000 BTU / hr
SERVICE & OWNER’S MANUAL
Voltage: 12 VDC
Amp Draw: 68
Refrigerant: R134a, 2.1 lb. Charge
The contents of this envelope are the property of the owner. Leave with the owner when installation is complete.
Approximate Installation Time *
Experienced Dealer Technician – 1 Hours
Average Dealer Technician – 1.5 Hours
Do-It-Yourself – 2 Hours
Rev. B, 10/30/2017
p/n: IM-1ACUNIT-G1
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TABLE OF CONTENTS
WARNINGS ................................................................................................... 3-4
FEATURES & OPERATION .............................................................................. 5
CARE AND MAINTENANCE ............................................................................ 5
REFRIGERANT FLOW DIAGRAM ................................................................... 6
TROUBLESHOOTING GUIDE ......................................................................... 7
SERVICE PARTS ........................................................................................ 8-10
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WARNINGS
Curtis air conditioners feature an assembly of parts designed for your vehicle which require
adjustment and alignment of components to accommodate vehicle variations and provide
proper weather protection. For accurate installation, proper operation, and years of
satisfaction, please read and understand the Service & Owner’s Manual fully prior to installing
the air conditioner.
ADDED
WEIGHT
Curtis Cabs, blades and general accessories
add additional weight to the base vehicle. All
Curtis accessory weights are listed in product
brochures. Deduct the accessory's total weight
from the vehicle's rated capacity and never
exceed the vehicle's rated capacity including
driver and passenger.
Exposure to Carbon Monoxide can Cause illness, serious injury or death. Never operate vehicle if suspicious
of Carbon Monoxide. Inspect exhaust system for leaks
monthly. Leaks can result from loose connections, corrosion, cracks or other damage to the exhaust manifold. If
leaks are found, repair or replace exhaust system. Do not
use vehicle until repair or replacement is complete.
California Health and Safety Proposition 65 Warning: This product may contain
chemicals known to the state of California to cause cancer and birth defects or other repro-
ductive harm.
Shock Hazard: Always disconnect the negative lead of the battery before servicing.
Disclaimer: Always discharge air conditioner refrigerant in accordance with all federal,
state, and local laws.
GENERAL INFORMATION BEFORE YOU START
HELPFUL HINTS:
Read and understand all instructions before beginning.
Apply a silicone sealant to seal any minor gaps that may occur due to vehicle variations .
Use caution to avoid damaging installed threaded inserts or weld nuts. Begin the thread engagement by hand to avoid
or correct potential cross threading.
Plastic washers have been supplied to provide a weather seal under the heads of some e xterior bolts. The plastic
washer should be installed under each bolt head directly against the outside cab surface. Care should be taken not to
over tighten the fasteners and damage the plastic washer.
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WARNINGS
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Your new air conditioner should arrive laying down flat.
Take care to protect the switches and louvers at the bottom of
the unit when handling.
15° MAX
Do not receive the air conditioner from the shipping
company if the air conditioner is standing up on end as
shown.
Doing so will drain the oil from the compressor.
90° MAX
Do not tip the air conditioner more than 15° in the direction
shown above during installation and service.
Doing so will drain the oil from the compressor.
Do not tip the air conditioner more than 90° in the
direction shown above during installation and service.
Doing so will drain the oil from the compressor.
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FEATURES & OPERATION
Your new Curtis Air Conditioner is designed to make your driving experience more comfortable in hot weather.
Turn the 4 POSITION VENTILATION SWITCH to activate the blower. The air conditioner may be used as a fan
in this manner.
Toggle the A/C ON-OFF SWITCH to activate the compressor for chilled air. The blower must be turned on
before the compressor will activate.
VENTS
A/C ON-OFF SWITCH
BLUE LED SHOULD BE ON
WHEN A/C IS RUNNING.
4-POSITION VENTILATION SWITCH
OFF-LOW-MED.-HIGH
THIS SWITCH OPERATES THE BLOWER
FAN, AND MUST BE ON FOR THE
COMPRESSOR TO START.
VENTS
CARE AND MAINTENANCE
Every 50 hours of operation, clean the exterior of the condenser.
Periodically inspect and tighten hardware after every 40 hours of operation for the entire life of the air
conditioner.
This product is designed with the use of R134a as a refrigerant. Never substitute other refrigerants, use of
any other refrigerant will void warranty.
Charge unit with 2.1 lbs. of R134a refrigerant.
Apply vacuum to for a minimum of 20 minutes prior to charging the air conditioner with R134a.
Do not vent refrigerant to the atmosphere. If the unit has to be discharged for any reason, recover the
refrigerant in compliance with federal, state and local laws.
Replace the drier receiver (9SV-9AC-00003) when replacing a compressor (9SV-9AC-00006).
Wash the painted surfaces of the air conditioner with commercial automotive cleaning products.
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REFRIGERANT FLOW DIAGRAM
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PRESSURE SWITCH 9SV-9AC-00005
LOW PRESSURE COMPRESSOR FITTING 9SV-9AC-00025
COMPRESSOR 9SV-9AC-00006
HIGH PRESSURE COMPRESSOR FITTING 9SV-9AC-00024
SERVICE PORT, LOW PRESSURE
DRIER RECEIVER 9SV-9AC-00003
SIGHT GLASS
DRIER TO EVAPORATOR LINE 9SV-305-00005
EVAPORATOR CORE 9SV-9AC-00002
EXPANSION VALVE 9SV-9AC-00004
CONDENSER TO DRIER LINE 8SV-305-00011
HIGH PRESSURE LINE 8SV-305-00009
SERVICE PORT, HIGH PRESSURE
LOW PRESSURE RETURN LINE 9SV-305-00007
CONDENSER 8SV-304-00006
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TROUBLESHOOTING GUIDE
Some air conditioners have a time delayed start (5 seconds), to allow the vehicle’s motor to get up to speed before
engaging the auxiliary alternator.
The air conditioner’s compressor has a built in reset time between stopping and restarting in order to allow refrigerant
pressure to equalize. This is done to prevent starting against high pressures, which will extend the life of the
compressor.
Check all fuses:
5 amp ATC blade fuses, refer to alternator kit for details.
15 amp ATC blade fuse located at Relay 4, located inside the air conditioner.
25 amp ATC blade fuse located at Relay 3, located inside the air conditioner.
Two 100 amp fuses located along 2AWG red wire, and near the battery. Refer to alternator kit for details.
Diodes
There are two diodes in what look like mini blade fuse holders, located inside the A/C un it as part the wire harness.
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Do not replace diodes with fuses. The unit will not turn off, draining the battery.
Check all relays:
Relays, located under the cover of the A/C unit.
Timed relays, located under the cover of the A/C unit.
Check alternator output. The alternator should put out 12-14 volts DC.
Check the thermostat electrical connections. The air conditioner will not operate without a functional ther mostat.
Check the tension of the alternator belts.
If the evaporator core is frozen solid:
Check the placement of the thermocouple. It should be nested in the evaporator housing and fit between the fins of
the evaporator core.
Check refrigerant pressure:
Compress or will not start if there is insufficient refrigerant pressure.
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1ACUNIT-G1
SERVICE PARTS
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CONDENSER FAN BRACKET
P/N: 8SV-110-00040
HIGH PRESSURE LINE
P/N: 8SV-305-00009
EVAPORATOR ASSEMBLY
P/N: 8SV-304-00001
CONDENSER TO DRIER LINE
P/N: 8SV-305-00011
CONDENSER
P/N: 8SV-304-00006
12V SOLENOID
P/N: 9SV-1TBP61A
DRIER TO EVAPORATOR LINE
P/N: 9SV-305-00005
DIODE, 1 AMP, MINI
P/N: 9SV-85-10-0027
LOW PRESSURE RETURN LINE
P/N: 9SV-305-00007
EVAPORATOR CORE
P/N: 9SV-9AC-00002
RELAY, 12V, 20/40A, SPDT, MINI ISO
NOTE: SOME VEHICLES MAY REQUIRE DIFFERENT OR
ADDITIONAL RELAYS. REFER TO THE ALTERNATOR KIT
P/N: 9SV-85-01-0022
MANUAL SPECIFIC TO YOUR VEHICLE.
DRIER RECEIVER
P/N: 9SV-9AC-00003
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1ACUNIT-G1
SERVICE PARTS
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EXPANSION VALVE
P/N: 9SV-9AC-00004
AXIAL FAN
P/N: 9SV-9AC-00007
PRESSURE SWITCH, 2-28KG/CM2
P/N: 9SV-9AC-00005
THERMOSTAT
P/N: 9SV-9AC-00008
COMPRESSOR, 12 VDC
P/N: 9SV-9AC-00006
HIGH PRESSURE COMPRESSOR
FITTING W/ O-RING
P/N: 9SV-9AC-00024
LOW PRESSURE COMPRESSOR
FITTING W/ O-RING
P/N: 9SV-9AC-00025
SWITCH, SPST
P/N: 9SV-OHC5
AIR INTAKE GRILL
P/N: 9SV-9HR-00017
4-WAY ROTARY SWITCH W/ KNOB
P/N: 9SV-OHC-26
2.8" LOUVER KIT (1 SET)
P/N: 9SV-9HR-00019
A/C UNIT O-RING KIT
P/N: 9SV-9OR-01
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1ACUNIT-G1
SERVICE PARTS
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CONSOLE ROCKER SWITCH
COVER, BLUE LENS
P/N: 9SV-9PCD1-P
WIRE HARNESS, TIME DELAY OFF DIODE
P/N: 9SV-WH-00069
WIRE HARNESS, A/C ROOF UNIT
P/N: 9SV-WH-00049
WIRE HARNESS, LEADS FOR SIGNAL
WIRE & CONTROLLER
P/N: 9SV-WH-00066
3/8" PVC HOSE,
BLACK, 1/2" OD
9SV-AC-00019-15
5/8" STD BULB,
1/16" GRIP
9SV-PRO2-15
ARCH PSA RUBBER
.20WDX.15TALL
9SV-PR53-15
50MM I.D. AIR
DUCT, PAPER
9SV-OHC-28-6
CORK TAPE
<NOT PICTURED>
9SV-9AC-00022-5
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