Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 150

-15- Operation Mode <PQRY>
(1) Indoor unit operation mode
The operation mode can be selected from the following 6 modes using the remote controller.
1 Cooling mode
2 Heating mode
3 Dry mode
4 Automatic cooling/heating
mode
5 Fan mode
6 Stopping mode
(2) Heat source unit operation mode
1 Cooling only mode
2 Heating only mode
3 Cooling main mode
4 Heating main mode
5 Stopping mode
Note: When indoor units in cooing and heating coexist, the operation mode (cooling main mode or heating main mode)
will be determined by the heat source unit, based on the refrigerant pressure in the WR2 refrigerant circuit and
speed variation data.
(3) Operation pattern for automatic cooling/heating mode
When the automatic cooling/heating mode is selected from remote controller functions, the indoor temperature will be de-
tected in pattern as shown in the figure below, and the operation mode (cooling or heating) will automatically be selected.
1.5 deg C
1 deg C [2 deg F] Cooling
[3 deg F]
1 deg C [2 deg F]
1.5 deg C
[3 deg F]
(4) Relationship between the operation mode and the load capacity (kW) (within a system)
Cooling load
capacity
Cooling load Heating load
+
capacity capacity
-16- DEMAND Control <PQHY/PQRY>
Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the heat source units.
Note: When DIP SW4-7 is set to ON, the 4-step DEMAND control is enabled. While this control is enabled, the NIGHT
MODE will be disabled.
Refer to 2 [2] 2.(5) for detailed information on DEMAND control.
All indoor units in operation are in cooling mode.
All indoor units in operation are in heating mode.
Coexistence of units in cooling and heating modes.
Coexistence of units in cooling and heating modes.
All indoor units are in fan mode or stopping mode.
Fan
Heating
100(%)
Cooling load
X100 = Cooling
load (%)
0
Cooling only Cooling main
mode mode
Total heat recovery mode
- 141 -
Fan
0
Heating load
Heating =
load (%)
100(%)
Heating main Heating only
mode mode
[ VII Control ]
Switches to cooling mode
Cooling operation under
Thermo-ON conditions
Set temperature
(Variable between 19 C and 28 C
[ 67 F and 83 F])
Heating operation under Thermo-ON conditions
Switches to heating mode
Heating load
capacity
X 100
Cooling load Heating load
+
capacity capacity