United Technologies Carrier TRANSICOLD 68RM35-604-20 Operation And Service page 13

UNLOADER PRESSURE SWITCH-Contacts Open/Close Settings [psig(kg/cm@)]
Refrigerant
Load Up
(Opens)
R-134a 35 2
(2.5
UNSAFE CONDITION
Excessive current draw by the
boost pump motor.
Excessive current draw by
evaporator fan motor no. 2.
Excessive current draw by
evaporator fan motor no. 1.
Excessive current draw by
condenser fan motor no. 2.
Excessive current draw by
condenser fan motor no. 1.
Excessive current draw by
clutch
High system pressure
Low system pressure
T-288
Table 1-2. Unloader Pressure Switch Settings
UPS1
Unload
(Closes)
26 2
0.14) 0.14)
(1.8
Table 1-3. Safety Devices
SAFETY DEVICE
Circuit Breaker -- CB1
Manual Reset
Circuit Breaker -- CB2
Manual Reset
Circuit Breaker -- CB3
Manual Reset
Circuit Breaker -- CB4
Manual Reset
Circuit Breaker -- CB5
Manual Reset
Circuit Breaker -- CB6
Manual Reset
High Pressure Switch
(HPS)
Automatic Reset
Low Pressure Switch
(LPS)
Automatic Reset
UPS2
Load Up Unload
(Opens) (Closes)
31 2 23 2
0.14) 0.14)
(2.2 (1.6
R-134a Units:
Opens at: 300
Closes at: 200
R-134a Units:
Opens at: 6
Closes at: 25
1-6
UPS3
Load Up
(Opens) (Closes)
220 15
1)
(19
DEVICE SETTING
Opens at 15 amps
Opens at 60 amps
Opens at 60 amps
Opens at 60 amps
Opens at 60 amps
Opens at 10 amps
10 psig (21 0.7 kg/cm@)
10 psig (14 0.7 kg/cm@)
3 psig (0.42 0.21 kg/cm@)
5 psig (1.8 0.35 kg/cm@)
Unload
270 15
1)
(19