Operation Flow Chart - Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook

[4] Operation Flow Chart

(1) Heat source unit
"HO" blinks on the remote
controller
Oil return LEV (SLEV), INV
cooling LEV (LEV2) fully closed
1. 52C
2. Inverter output
3. All solenoid valve
Cooling (Cooling-
Note : 1 For about 3 minutes after turning on power source, address and group information of heat source unit, BC, controller indoor
unit, and remote controller are retrieved by remote controller, during which "HO" blinks on and off on remote controller. In case
indoor unit is not grouped to remote controller, "HO" display on remote controller continues blinking even after 3 minutes after
turning on power source.
Note : 2 Two trouble modes included indoor unit side trouble, (BC controller trouble) and heat source unit side trouble. In the case of
indoor unit side trouble, error stop is observed in heat source unit only when all the indoor units are in trouble. However, if one
or more indoor units are operating normally, heat source unit shows only LED display without undergoing stop.
Note : 3 On PUHY system, operation mode conforms to mode command by indoor unit. However, when heat source unit is being under
cooling operation, the operation of indoor unit will be prohibited even by setting a part of indoor units under operation, or indoor
unit under stopping or fan mode to heating mode. Reversely when heat source unit is being heating operation, the same
condition will be commenced.
On PURY system, operation mode conforms to mode command by BC controller.
Note : 4 In case BC controller issues cooling/heating mixed operation mode, heat source unit decides operation mode of cooling-main
operation or heating-main operation.
Start
Breaker
turned on
YES
Set indoor ad-
dress No. to remote
NO
controller
YES
NO
Operation
command
YES
Fan
Operation
mode
OFF
0Hz
Error mode
OFF
NO
52C ON
Operation
mode
Heating (Heating-
only) operations only) operations
Operation mode command to (BC controller) heat source unit
NO
Note : 1
Cooling-only, Heating-only,
Cooling/heating mixed
Note : 2
YES
Note : 3
Cooling/heating mixed
Note : 4
Operation
mode
Cooling-main
operations
–56–
Normal operations
Trouble observed
Stop
Error stop
Error code blinks on the
outdoor controller board
Error command to
BC controller
Error code blinks on the
remote controller
Heating-main
operations