AIR COOLED SCROLL CHILLER CONTROL
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If compressor 1/2 is on, fan A/B will have been on prior to 30s.
2.2 Heating Mode（Defrosting/ Auxiliary Electric Heater(E-heater)）
Tin=T_Hin－ΔT×N
Tout=T_Hout
－ΔT×N-T
Tin
=T_Hin－ΔT×N-T
Tout
=T_Hout－ΔT×N
（1）Control of compressor
For the module n, N＝n & 0x03,ΔT＝0.5,T＝0.3.
Compressor 1:
When Tin≤T_Hin－ΔT×N, compressor 1 is on.
When Tout≥T_Hout－ΔT×N, compressor 1 is off.
Under other conditions, it keeps original.
Compressor 2:
When Tin≤T_Hin－ΔT×N-T, compressor 2 is on.
When Tout≥T_Hout－ΔT×N-T,compressor 2 is off.
Under other conditions, it keeps original.
（2）Control of fan
It is the same as that in cooling mode.
（3）Control of 4-way valve
a. For the first startup of unit from cooling mode to heating mode, the 4-way valve is
energized after compressor is on for 20s.
b. For common startup (manual or timer) of the unit in heating mode, the 4-way valve will
stop after it starts for 40s and then it restarts after the compressor is on for 20s.
c. If the compressor in heating mode is turned off at the setting temperature point, the 4-way
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