Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
64 Function R407C PLUS Series Heat Recovery System
3.3.4 Compressor ON/OFF Conditions
Purpose
!
Defines the compressor ON/OFF conditions.
Contents 1. Compressor restarting conditions in stop mode
2. Compressor stopping conditions in operation mode
3. Magnetic contactor (52Ci) used in inverter compressor turns on when the above condition 1
is met, and turns off only when all connected indoor units stop operation.
(In other words, the 52Ci remains ON and inverter frequency becomes 0Hz when either of
indoor units is in thermostat OFF operation and the compressor stopping conditions are met.)
3.3.5 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)
• Either of connected indoor units in thermostat ON operation (excluding fan operation)
• Not in 3.2.1 “Restart Standby”
• Not in 3.2.7 “Standby due to outdoor temperature”
• No standby command from inverter
• Not in malfunction stop mode
• Not in Demand 3
I
&
(V2578)
• All connected indoor units not in thermostat ON operation (including fan operation)
• 3.2.2 “Standby due to detection of Pc error” activated
• 3.2.3 “Standby due to detection of Pe error” activated
• 3.2.4 “Standby due to detection of Td error” activated
• 3.2.5 “Standby due to switching of cooling and heating operation” activated
• 3.2.7 “Standby due to outdoor temperature” activated
• Standby command provided from inverter
• In malfunction stop
• In Demand 3
H
&
(V2579)
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
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