1--7
T--304
Change 07/09
1.2.6 System Operating Controls And Compo-
nents
Thesystemisoperatedbyanelectronicthermostattype
controller and/or manually operated switches. The
manually operated switches are located on the drivers
control and may consist of a single ON/OFF switch or
additional switches. The controller regulates the
operational cycles of the system by energizing or
de--energizing relays on the relay board in response to
deviations in interior temperature. Modes of operation
includeCoolingandHeating.Onsystemsfittedwithonly
an ON/OFF switch, the controller will cycle the system
between the operating modes as required to maintain
desired set point temperature (See Section 6 for wiring
diagrams).
In the heat mode the heat valves are opened to allow a
flow of engine coolant through the heat coils located in
the evaporator section. The evaporator fans operate to
circulate air over the heat coils in the same manner as
the cooling mode.
In the cooling mode the compressor is energized while
the evaporator and condenser fans are operated to
provide refrigeration as required. The compressor (s)
capacity is matched to the bus requirements. Once
interior temperature reaches the desired set point, the
compressor(s) is deenergized.
1.2.7 280P & 282P (PWM) Electronic Thermostat
Controller
This type controllerhas three(3) modes, Cool, Ventand
Heat.
The range on the potentiometer is 62.6° -- 86° F
(17--30° C).
1.2.8 CSDD BT--324
(Carrier--Sutrak Digital Display)
Microprocessor
This Carrier Sutrak Digital Display (BT--324) controller
has three (3) modes, Auto, V ent(Cycleclutch type)and
Heat.
1.2.9 Motor Fault Board (Optional)
The motor fault board(See Figure 1--11)consists of red
and green LED’s, which when illuminated, will reflect
each motors state of condition. When the evaporator
and condenser motors are energized, the green LED’s
will be illuminated. If a red LED is energized, it will show
an “open circuit” condition, indicative of a motor failure.
The green LED will not be illuminated at this time. The
motor fault board is a seperate circuit board that is
located at the return air section. The return air grill is
oppened to view the LED indicators.
1.3 REFRIGERATION SYSTEM COMPONENT
SPECIFICATIONS
a. Refrigerant Charge R--134a (Approximate)
NOTE
Refrigerant charge will dependon hoselengths
and diameters; or if there is an In--Dash unit
(front evaporator).The followingshould only be
used as a guideline.
AC310 Dual Loop A--6 or TM--21 Compressor
6 Pounds (2.7 kg) -- Curbside
8 Pounds (3.6 kg) -- Roadside
AC310 -- Single Loop TM--31 Compressor
12 Pounds (5.4 kg) without In--Dash unit
AC310 -- Single Loop 05G or 05K Compressor
13.2 to 15.4 Pounds (6.0 to 7.0 kg) without
In--Dash unit
AC350 -- Single Loop 05G or 05K Compressor
16.5 to 18.7 Pounds (7.5 to 8.5 kg) without
In--Dash unit
For systems with In--Dash unit (Optional)
Add 2 pounds (0.9 kg) to above listed charge.
b. Compressors
Compressor
A6 (No longer Available)
Weight, (Dry) 34.5 Lbs.
Oil Charge 10 Oz. PAG (07--00333--00)
Compressor TM--21
Weight, (Dry) 7.5 Lbs. (3.4 kg)
Oil Charge
6.1 Oz. (180 cc) PAG
(46--50006--00)
Compressor TM--31
Weight, (Dry) 21 Lbs.
Oil Charge
16.9 Oz. (500cc) PAG
(46--50006--00)
Compressor Carrier 05K
Weight, (Dry) 108 Lbs.
Oil Charge
5.5 Pints POE
(07--00317--00pk6)
Compressor Carrier 05G
Weight, (Dry) 146 Lbs. W/Clutch
Oil Charge
7.75 Pints POE
(07--00317--00pk6)
c. Thermostatic Expansion Valve:
Superheat Setting (Externally Adjustable) Factory
Setat9to18°F(±4°F) MOP Setting: 55 ±4 psig
(3.74 ±2.27 bar)
d. High Pressure Switch (HPS) Normally Closed
Opens at: 360 ±10 psig (20.41 ±0.68bar)
Closes at: 280 ±10 psig (13.61 ±0.68bar)
e. Low Pressure Switch (LPS) Normally Open
Opens at: 6 ±3psig (0.41 ±0.20 bar)
Closes at: 25 ±3psig(1.7±0.20 bar)
f. Water Temperature Switch (WTS)
[Bus Manufacturer Supplied -- Suggested close on
temperature rise at 105°F(41°C)]
1.4 ELECTRICAL SPECIFICATIONS -- MOTORS
a. Evaporator Blower/Motor
Evaporator Motor
Permanent Magnet
24 VDC 12 VDC
Horsepower (kW) 1/8 (.09)
Full Load Amps (FLA) 9.5 19
Operating Speed High/
Low (RPM)
4200
1850
Bearing Lubrication
Factory Lubricated
(additional grease not required)
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