Haier H2SM Series Service Manual page 20

and 3 minute run. There is a return difference of 2¡æ for the change between low speed and run
and stop.
4.5. Once the fan operates in a mode, it must operate for more than 45 seconds.
4.6. There is a temperature cut-off protection: when a indoor coil temperature higher than T_CPS
(68¡æ) and maintains for 10 seconds, the corresponding compressor stops. The compressor will
not restart in 3 minutes until the coil temperature lower than T_CP R(50¡æ). The indoor fan is
controlled the same as the thermostat is OFF.
4.7. In the case of double-unit cooling, one compressor stops and it changes to the single-unit
operation. The fan is controlled in the single-unit operation mode. It stops 30 after blowing off
the remaining heat only if both compressors turn off at the same time.
5. Single unit heating operation:
5.1. When the single unit's indoor unit gives a heating signal, the corresponding outdoor
compressor carries out cooling operation. During the operation, the outdoor fan and 4-way valve
operate 1 second before the outdoor fan operates.
5.2. When changed from cooling to heating, the compressor stands by for 3 minutes, the outdoor
fan stops.
5.3. When the outdoor ambient temperature T1¡Ü3¡æ, the outdoor fan runs at the high speed. There
is a return difference of 2¡æ for the change between high and medium speed.
When the outdoor ambient temperature T1¡Ý13¡æ, the outdoor fan runs at the low speed. There is a
return difference of 2¡æ for the change between low and medium speed.
5.4. Once the fan operates in a mode, it must operate for more than 45 seconds.
5.5. There is a high temperature protection and a temperature cut-off protection.
High temperature protection: When the indoor coil temperature higher than T_OFS (56¡æ), the
outdoor fan stops; when the coil temperature falls to T_OFR (52¡æ), the outdoor fan restarts. The
outdoor fan stops for more than 45 seconds.
High temperature cut-off protection: When the indoor coil temperature higher than T_CPS (68¡æ)
and maintains for 10 seconds, both the compressor and outdoor fan stop, and the indoor fan operates
as the thermostat is Off. The compressor will not restart in 3 minutes until the coil temperature
lower than T_CP R(50¡æ).
6. Double-unit heating operation
6.1. When the double-unit's indoor unit gives out a heating signal, outdoor compressor A starts
Air Conditioner
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Edition:2006/1/10