TK 62061-18-IM-EN
65
Single temperature SPR Valves Setting
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SPRs are set to 2 bar as default from factory, measured in the pressure port close to the valve.
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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 bar (value measured at main compressor suction port)
• T < +25 ºC (cool countries): 2.7 bar (value measured at main compressor suction port)
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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.
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