Mitsubishi Electric QAHV-N560YA-HPB Service Handbook page 117

[ VII Control ]
Cooling/heating Circuit Control and General Function of System Equipment
-13- System control method
1
Local control method
Dry contact input of operation and operation mode commands from the local controller is used to start or end the water
heating/hot water storage operation.
When the operation commands to heat water and store hot water are both received at the same time, the command to
heat water overrides.
2
Three-sensor method
Three water temperature sensors are installed on the hot water storage tank. Water heating operation is started or ended
according to the preset water temperature.
When a dry contact input is received from the local controller, the unit will be operated in the hot water storage operation
except when it is already operated in the water heating mode.
* PAR-W31MAA or AE-200 is required when three-sensor method is used.
Heat pump unit
Control logic of Storage Tank Temperature
Use the optional parts thermistor (TW-TH16E) to control the water temperature in the storage tank.
Ex.Mode setteing = Mode2
QAHV
Mode1
Mode2
Mode3
HWE1517A
Temperature
sensor
TH16<55°C-Mode2
Thermo differential
value (code: 1509)
TH15
→QAHV start running
TH16
TANK
TH17
*TH15,TH16,TH17 : Optional parts (TW-TH-16E )
Sensor
Thermo-ON TH15
Thermo-OFF TH16
Thermo-ON TH16
Thermo-OFF
TH17
Thermo-ON TH15
Thermo-OFF
TH17
Setting adjustable
Temperature setting
65°C
55°C
60°C
- 110 -
Hot water supply
TH15
←
TH16
←
TH17
←
Feed water
QAHV
TANK
TH17>55°C
→QAHV stop
TH15
TH16
TH17
GB