Operation Mode - Mitsubishi Electric HP120TNU-A Service Handbook

[5-2 Outdoor Unit Control ]
5-2-16

Operation Mode

(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) Outdoor unit operation mode
1 Cooling only mode
2 Heating only mode
3 Cooling main mode
4 Heating main mode
5 Stopping mode
When units in cooing and heating coexist, the operation mode (cooling main mode or heating main mode) will be determined,
based on the refrigerant pressure in the R2 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 detect-
ed in pattern as shown in the figure below, and the operation mode (cooling or heating) will automatically be selected.
When it detects more than 1.5 degrees difference against set temperature for more
than 3-min continuously, operation mode change to cooling mode.
+1.5ºC
*If it comes under 1.5 degrees difference again, it need to count 3 minutes from at that time.
+1ºC
Cooling
+0.5ºC
Set temp
Fan
-0.5ºC
-1ºC
-1.5ºC
(4) Relationship between the operation mode and the load capacity (kW) (within a system)
Cooling load
capacity
Cooling load Heating load
+
capacity capacity
24
- chapter 5
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.
Cooling
Cooling
Fan
Fan
Heating
Switches to heating mode
When it detects more than 1.5 degrees difference against set temperature
3 minutes
for more than 3-min continuously, operation mode change to heating mode.
*If its over 1.5 degrees difference again, it need to count 3 minutes from that time.
100(%)
Cooling load
X100 = Cooling
load (%)
0
Cooling only Cooling main
mode mode
Total heat recovery mode
3 minutes
Fan
Fan Fan
Heating
Heating
0
Heating load
Heating
load (%)
100(%)
Heating main Heating only
mode mode
Switches to cooling mode
Cooling
Cooling
Fan
Heating load
capacity
= X 100
Cooling load Heating load
+
capacity capacity
HWE18220_GB