22 MS-SVN052E-EN
System Operation
Protection Functions
Outdoor coil protection function (T3)
– When T3 ˃ 143.6ºF, compressor stops working
– When T3 ˃ 129.2ºF, compressor starts working
Ambient temperature protection (T4)
– When 40ºF ≤ T4 ˂ 120ºF, the unit is able to operate in the cooling mode
– When 5ºF ≤ T4 ˂ 86ºF, the unit is able to operate in the heating mode
– When T4 ˂ 6.8ºF, the heat pump provides the indoor unit with 24V, which in turn
activates the electric heater (if installed)
Discharge temperature (DT) protection (T5)
–When DT ˃ 239ºF during cooling mode, the compressor shuts down
–When DT ˂ 194ºF during cooling mode, the compressor starts up again
–When DT ˃ 221ºF during heating mode, the compressor starts up again
High pressure protection (HPS) (mechanical switch opening/closing pressure)
– When HPS is P ˃ 580 PSIG, both the compressor and outdoor fan shut down
– When HPS is P ˂ 435 PSIG, both the compressor and outdoor fan start up again
Low pressure protection (LP)
–When LP ˂ 43.5 PSI during a period of 5 minutes in the cooling mode, both the compressor
and outdoor fan shut down. After a 6 minute lapse, the system tries to start up again
Module (inverter) heating protection (TF)
– When TF ˃ 176ºF, both the compressor and outdoor fan shut down
– When TF ˂ 145ºF, both the compressor and outdoor fan start up again
Note: In an effort to improve our products, we reserve the right to make changes without previous notice.
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