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Sequence of Operation
5. Anti-frosting protection
Control the unit operation frequency and the frequency changing rate to achieve anti-frosting protection.
5.1 Frequency Slowly Increasing(FSI):
5.1.1 If 43˚F≤IPT <45˚F, the frequency increasing rate is 1Hz/60s, slowly increasing operation speed.
5.1.2 When IPT≥7˚45˚F, unit protection shuts down the unit.
5.2 Frequency Limitation:
If 41˚F≤IPT<43˚F, the compressor frequency forbidden to increase.
5.3 Normal Frequency Decreasing (NFD):
If 37˚F≤IPT<39˚F, the frequency decreasing rate is 8Hz/90s, until reaching the lower frequency limit.
5.4 Fast Frequency Decreasing (FFD):
If 35˚F≤IPT<37˚F, the frequency decreasing rate is 16Hz/90s, until to the lower frequency limit.
5.5 Unit stop:
5.5.1 When IPT<34˚F for 3min continuously, unit stops working for anti-defrosting protection.
5.5.2 While IPT<42˚F, and the unit stopped for 3 min already, can the unit recover to operation.
6. Dry mode
6.1 Temperature control: 61-88˚F.
Fan speed: low Vane blade position: as selected.
6.2 When Main PCB fails or stops for protection, Display PCB works as preset.
6.3 Failure protection: as cooling mode.
6.4 Energy saving and sleep mode: Invalid.
6.5 Fan motor stops working.
6.6 Energy saving and sleep mode: Invalid.
7. Fan mode
7.1The temperature setting: 61-88˚F,
Fan speed and vane position: as preset.
7.2 For above function, when unit preset to be auto fan mode, the fan motor will change its operation speed based on the
temperature difference of ambient and preset temperature.
7.3 Outdoor fan and compressor always OFF.
5.2.5 Timer
19
OPERATION
RT-ST
0.9
℉
0℉
-1.8
℉
-3.6
℉
-5.4
℉
10min.
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
℉
δt comes down
39
High fan
36
Mid fan
32
Low fan
5min.
≥3min.
2min.
≥ 7min.
160S
5s
ON
Figure 301
δt goes up
Figure 302
160S
OFF
℉
39
36
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