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1.2
REFRIGERATION SYSTEM COMPONENT
SPECIFICATIONS
a. Refrigerant Charge
R-134a: 16 to 17 lb (7.3 to 7.7 kg)
b. Compressor
Model: 05G
No. of Cylinder: 6
Weight (Dry): 145 lbs. (66 kg) including clutch
Oil Level:
Oil Charge: 6.75 pints (3.2 liters)
Oil Level:
Between Min--Max marks on crankcase
Approved Compressor Oils - R-134a:
Castrol: Icematic SW68C
Mobil: EAL Artic 68
ICI: Emkarate RL68H
c. Thermostatic Expansion Valve
R-134a Units
Superheat Setting: 10_F (5.6_C)
MOP Setting: 53.9
kg/cm@)
d. Low Pressure Switch (LPS)
Opens at: 6
3 psig (0.42
Closes at: 25
5 psig (1.8
e. High Pressure Switch (HPS)
R-134a Units
Opens at: 300
Closes at: 200
f. Condenser Fan Switch (CFS)
R-134a Units
Opens for high speed: 250
0.7 kg/cm@)
Closes for Low Speed: 190 15 psig (13
0.7
kg/cm@)
g. Condenser Fan Motor
Bearing Lubrication: Factory Lubricated
(additional grease not required)
Horsepower: 0.8 hp (0.6 kw)
Full Load Amps (FLA): 32 amps
Operating Speed:
Low: 1400 rpm
High: 1800 rpm
Voltage: 24 vdc
h. Low Ambient Switch (LATH)
Opens at: 45
5_F ( 7.3
Closes at: 55
5_F (12.9
0.28
4 psig (3.8
0.21 kg/cm@)
0.35 kg/cm@)
10 psig (21
0.7 kg/cm@)
10 psig (14
0.7 kg/cm@)
10 psig (18
2.8 _C)
2.8 _C)
i. Water Temperature Switch
Closes at 105_F (41_C) on temperature rise
j.
Reheat Coolant Valve
(Customer Supplied)
k. 05G Compressor Electric Unloader Pressure
Switches UPS1, UPS2 & UPS3
(See Table 1-2 for settings.)
1.3 ELECTRICAL SPECIFICATIONS
a. Evaporator Blower Motor
Bearing Lubrication: Factory Lubricated
(additional grease not required)
Horsepower: 0.8 (0.6 kw)
Full Load Amps (FLA): 32 amps
Operating Speed: Low: 1400 rpm
Voltage: 24 vdc
b. Condenser Fan Motor
Bearing
Lubrication:
(additional
required)
Horsepower: 0.8 hp (0.6 kw)
Full Load Amps (FLA): 32 amps
Operating Speed:
Low: 1400 rpm
High: 1800 rpm
Voltage: 24 vdc
1.4 SAFETY DEVICES
System components are protected from damage
caused by unsafe operating conditions with safety
devices listed in Table 1-3.
If the high pressure switch (HPS) or low pressure
switch (LPS) opens due to unsafe operating
conditions, the A/C operation will automatically
stop. The A/C stop light will illuminate to indicate
an unsafe condition. The evaporator blower
motors will continue to operate to circulate air
throughout the bus. During any mode of
operation, the evaporator or condenser fan
motors will stop if excessive current draw is
sensed by circuit breakers. All breakers must be
manually reset by depressing the breaker button
when opened.
When the high pressure switch (HPS) or low
pressure switch (LPS) opens and unit operation
stops, place the driver's A/C switch to the OFF
position and back to the ON position to reset the
A/C stop relay and de-energize the A/C stop light.
1-5
High: 1800 rpm
Factory
Lubricated
grease not
T-288
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