Mitsubishi Electric QAHV-N560YA-HPB Service Handbook page 116

[ VII Control ]
Control at Initial Start-up
-10- Peak-demand control
General idea about demand control in the system with a combination of a heat pump and a combustion-type hot water boiler.
→During peak-demand hours, the operation of the air conditioning units is given higher priority than that of the heat pump units.
The peak-demand control function is a function that restricts the maximum capacity of the units. The maximum operation
capacities of the units are restricted to specific levels relative to the maximum capacity of the units (= the compressors are
operating at the maximum rotation speed (100 Hz on the unit described in this manual)) being set as 100%.
80%
Preset value
Emergency Operation Mode
-11- Multiple system control
1. Electrical wiring diagram
External
water
temperature
sensor
Field-supplied dry contact
switch/relay or remote
controller (PAR-W31MAA) or
centralized controller (AE-200)
SW2-9: ON
Address: 1
* The main unit is the unit to which an external water temperature sensor is connected.
( * ) Main/Sub units and switch settings
Main unit (Unit to which the external
water temperature sensor is connected.)
Control Method
-12- Automatic operation of pump for freeze-up protection
1. Natural freeze-up protection
Control method
Details
HWE1517A
100%
The compressor will operate at the maximum rotation speed of 80 Hz.
(100Hz)
Unit (MAIN circuit)
PCB
Main unit
SW2-6: OFF
SW2-9: ON
Address: 2
SW2-9
( Multiple system)
ON
Natural freeze-up protection based
on both the outside temperature
and the water temperature
Pump start conditions "Outside temperature is within ±1 ºC
of 1 ºC" OR "Inlet or outlet water
temperature is within ±1 ºC of 3 ºC"
Pump stop conditions "Outside temperature is more than
±1ºC of 3 ºC" OR "Inlet or outlet
water temperature is more than
±1ºC of 5 ºC"
Unit (MAIN circuit)
PCB
Sub unit
- 109 -
Unit (MAIN circuit)
PCB
Sub unit
"n"th unit
Inter-unit wiring
(M-NET line)
SW2-6: OFF
SW2-9: ON
Address: 1 + n
GB