Publicidad
SPR default factory setting
SPRs are set to 2 bar as default from factory, measured in the pressure port close to the valve.
Recommended SPR valve settings depending on the customer application
To maximise unit pull-down and performance both in cool and heating modes, SPR valves must be adjusted to the following values depending on the average ambient
temperature during the summer months (T):
•
T > +25 ºC (warm countries): 2.2 barg, measured at road compressor suction port
•
T < +25 ºC (cool countries): 2.7 barg, measured at road compressor suction port
SPR valve adjustment procedure
Before adjusting the SPR valves, the unit must be fully installed on the vehicle according to Thermo King procedures and have the appropriate oil and refrigerant charge (the
expansion valve does not need to be adjusted). The process described below assumes that the ambient temperature is high enough to have system pressures (discharge and
suction) under normal operating conditions. However, if system pressures are too low due to low ambient temperature conditions (< 0 °C), the same process could be
followed by running the unit on heating mode when possible and letting the compartment temperature rise to an acceptable level (> 15 °C).
1. Connect the pressure gauges to the road compressor ports. Start the unit in cooling on road mode (2000 - 2400 compressor rpm).
2. Adjust the SPR valve until the suction pressure reading on the road compressor port matches the recommended value for the application. Leave the unit running for 10-
15 mins to check that the pressure reading is stable.
3. Stop unit and disconnect pressure gauges.
(Rev. 4, 01/15)
Single temperature SPR Valves Setting
Eng
57
Publicidad
