12
Table 10 —List of 2000P EEV Valve Opening in Heating Mode
SUBCOOLING CONTROL — This function is used to adjust the opening of the electronic expansion valve (EEV) so that
subcooling (SC) will reach the target subcooling value (SCS).
Subcooling is calculated as the difference between the condensing temperature (Tc) and inlet pipe temperature (T2A) on the
indoor unit.
SC = Tc - T2A SC: Evaporator outlet subcooling (°F)
SCS: Target subcooling value Tc: Condensing temperature (°F)
T2A: Inlet pipe temperature (°F)
40VMC, F, H, I, L, M, R, U, V, W Series
Initial SCS = 9°F in the first ten minutes after the outdoor unit starts up.
The SCS corrections are made according to the following logic:
1. SCS = 9°F in test operation, trial operation, and forced heating operation.
2. Lack of refrigerant signal = OFF, SCS control uses the follow logic:
Fig. 21 —40VMC, F, H, I, L, M, R, U, V, W Series
SCS′ = the preceding SCS in the picture above.
Lack of refrigerant signals = ON, SCS = SCS′ + 3.6
3. If only one or two indoor units in the system are in heating operation, the EEV opening of these indoor units is forced to maximum
and fixed.
CAPACITY INDEX INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
≥48 1400 700 2000
36 1400 700 2000
24~30 1000 500 2000
15~18 600 500 2000
≤12 600 500 2000
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