1-6
1.3 ELECTRICAL SPECIFICATIONS
a. Evaporator Blower Motor
Evaporator Motor
Brushless
Bearing Lubrication
Factory Lubri-
cated (addi-
tional grease
not required)
Horsepower 0.6
Full Load Amps (FLA) 20
Operating Speed (RPM) 2200
Voltage 27-vdc
Dropping Resistor
0.6-ohms
300-watts
b. Condenser Fan Motor
Condenser Motor
Brushless
Bearing Lubrication
Factory Lubri-
cated (addi-
tional grease
not required)
Horsepower 0.6
Full Load Amps (FLA) 19
Operating Speed (RPM) 1800
Voltage 27-vdc
Dropping Resistor
0.25-ohms
300-watts
1.4 SAFETY DEVICES
Safety devices protect system components from
damage caused by unsafe operating conditions.
If the High Pressure Switch (HPS) or Low Pressure
Switch (LPS) opens due to unsafe operating conditio ns,
the A/C operation willautomatically stop. The A/C stop
light will illuminate to indicate an unsafe condition has
occurred.The evaporatorblower motorswillcontinueto
run to circulate air throughout the bus.
During any mode of operation (A/C, Vent or Heat),
theevaporatoror condensermotorswillstop ifexcessive
current draw is sensed by the circuit breakers. Allcircuit
breakers, when opened, must be manually reset by
depressing the breaker button.
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
backto the ONposition to resetthe A/CStop Relay and
de-energize the stop light.
Table 1-3. Safety Devices
Unsafe Condition Safety Device Device Setting
1. Excessive current draw by the Circuit Breaker --- CB1 Opens at 15 amps
boost pump motor. Manual Reset
2. Excessive current draw by Circuit Breaker --- CB2 Opens at 40 amps
evaporator blower motor no. 2. Manual Reset
3. Excessive current draw by Circuit Breaker --- CB3 Opens at 40 amps
evaporator blower motor no.1. Manual Reset
4. Excessive current draw by clutch. Circuit Breaker --- CB6 Opens at 10 amps
Manual Reset
5. Excessive current draw by Circuit Breaker --- CB7 Opens at 40 amps
condenser motor no.1. Manual Reset
6. Excessive current draw by Circuit Breaker --- CB8 Opens at 40 amps
condenser motor no. 2. Manual Reset
7. Excessive current draw by Circuit Breaker --- CB9 Opens at 40 amps
condenser motor no. 3. Manual Reset
8. High system pressure. High Pressure Switch (HPS) Opens at 425 10 psig
Automatic reset (30 0.7 kg/cm@)
9. Low system pressure Low Pressure Switch (LPS) Opens at 10 3psig
Automatic Reset (0.70 0.21 kg/cm@)
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