1-6
T-288
Table 1-2. Unloader Pressure Switch Settings
UNLOADER PRESSURE SWITCH-Contacts Open/Close Settings [psig(
kg/cm
@
)
]
UPS1
UPS2
UPS3
Refrigerant
Load Up
(Opens)
Unload
(Closes)
Load Up
(Opens)
Unload
(Closes)
Load Up
(Opens)
Unload
(Closes)
R-134a
35
2
(2.5
0.14)
26
2
(1.8
0.14)
31
2
(2.2
0.14)
23
2
(1.6
0.14)
220
15
(19
1)
270
15
(19
1)
Table 1-3. Safety Devices
UNSAFE CONDITION
SAFETY DEVICE
DEVICE SETTING
Excessive current draw by the
boost pump motor.
Circuit Breaker -- CB1
Manual Reset
Opens at 15 amps
Excessive current draw by
evaporator fan motor no. 2.
Circuit Breaker -- CB2
Manual Reset
Opens at 60 amps
Excessive current draw by
evaporator fan motor no. 1.
Circuit Breaker -- CB3
Manual Reset
Opens at 60 amps
Excessive current draw by
condenser fan motor no. 2.
Circuit Breaker -- CB4
Manual Reset
Opens at 60 amps
Excessive current draw by
condenser fan motor no. 1.
Circuit Breaker -- CB5
Manual Reset
Opens at 60 amps
Excessive current draw by
clutch
Circuit Breaker -- CB6
Manual Reset
Opens at 10 amps
High system pressure
High Pressure Switch
(HPS)
Automatic Reset
R-134a Units:
Opens at: 300
10 psig (21
0.7 kg/cm
@
)
Closes at: 200
10 psig (14
0.7 kg/cm
@
)
Low system pressure
Low Pressure Switch
(LPS)
Automatic Reset
R-134a Units:
Opens at: 6
3 psig (0.42
0.21 kg/cm
@
)
Closes at: 25
5 psig (1.8
0.35 kg/cm
@
)
Summary of Contents for Carrier TRANSICOLD 68RM35-604-20
Page 1: ...T 288 Rearmount 68RM35 604 20 R 134a NYCDOT...
Page 20: ...2 3 T 288 Figure 2 2 Automatic High Speed Cool Mode Operation with Reheat TDR 10 SEC...
Page 21: ...2 4 T 288 Figure 2 3 Automatic High Speed Cool Mode Operation No Reheat TDR 10 SEC...
Page 22: ...2 5 T 288 Figure 2 4 Automatic High Speed Heat Mode Operation Below 45_F Ambient TDR 10 SEC...
Page 43: ...5 3 T 288 Figure 5 2 Electrical Schematic Diagam Based on Drawing 68RM35 1038 12 TDR 10 SEC...
