Outline of Control PACD011001C2
442 Function UM Combination “MA1R Series” Using R-407C
3.1.15 Crankcase Heater Control
Controls the crankcase heater to prevent refrigerant from remaining in the inverter compressor.
Note:
STD compressor crankcase heater is controlled previous way. (ON/OFF by magnetic switch)
3.1.16 Gas Shortage Warning
Generates a warning when an excessive gas shortage occurs. This function generates an alarm only, and
does not stop operation.
• In cooling mode
· Lp < 0.10MPa (-21.6°C) 30 continuous minutes
→
Outputs gas shortage warning [U0].
· Lp
≥
0.10MPa (-21.6°C)
→
Cancels gas shortage warning.
• In heating mode
Crank case
heater OFF
Crank case heater
ON
• Outdoor air temp. > 30˚C
(V0833)
• Outdoor air temp. < 27 ˚C
&
OR
• Compressor stop during
the magnet contactor of
INV compressor ON
• The magnet contactor of
INV compressor OFF
&
SH1 (Evaporator1 outlet
superheat degree) > 20°C
Left conditions
remain for 60
continuous minutes
→
Outputs gas shortage warning [U0].
EV1 = 2000 pls (full open)
SH2 (Evaporator2 outlet
superheat degree) > 20°C
EV2 = 2000 pls (full open)
SH3 (Evaporator3 outlet
superheat degree) > 20°C
EV3 = 2000 pls (full open)
OR
SH1 (Evaporator1 outlet
superheat degree)
≤
20°C
→
Cancels gas shortage warning.
EV1 < 2000 pls (full open)
SH2 (Evaporator2 outlet
superheat degree)
≤
20°C
EV2 < 2000 pls (full open)
SH3 (Evaporator3 outlet
superheat degree)
≤
20°C
EV3 < 2000 pls (full open)
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