Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 42

7-4. HEAT operation
Control modes
1. Compressor 1-1. Thermoregulating function (Function to prevent restarting for
3 minutes)
• Room temperature [ desired temperature-1: ···Compressor ON
• Room temperature ] desired temperature ···Compressor OFF
1-2. Over- rise protection control
Detected control : When Condenser/ Evaporator temp.
turns 74: or more, less than 90: after starting
compressor, stop the compressor, then the mode changes to
restarting compressor, stop the compressor, then the mode
changes to restarting protection mode after 6 minutes.
After restarting after 6 minutes when the Condenser/
Evaporator temperature became 74: or more, less than 90:
by the time 10 minutes pass, the mode changes to over-rise
protection control.
Release control : When the operation stops by the remote
controller.
2. Auxiliary heater
2-1. Thermoregulating function
When the mode is not Hot adjust or Defrosting mode during
HEAT compressor operation, the controller changes to
auxiliary heater ON.
Thermoregulating function follows the below table with
according to desired temp. and room temp.
Temperature difference
temperature difference Z=Desired temperature - Room temperature
2-2. Over-rise prevention control
During the HEAT compressor operation, when the Condenser/
Evaporator temperature becames 63: or more, over-rise
prevention control operates and the auxiliary heater prohibits
for ON operation. When the indoor Condenser/Evaporator
temperature is being 58: or less for 3minutes during
over-rise prevention, over-rise prevention control will be
released and auxiliary heater ON will be allowed.
(However, in case the Condenser/Evaporator temperature
becomes 66: or more during over-rise prevention, 40: or
less will be the requirement to release over-rise prevention
control and allow auxiliary heater to be ON.)
Control details
z < 0
0 [ z < 3
Keeping condition
3 [ z
Auxiliary heater
OFF
ON
42
Remarks
1
The thermoregulating function is
provided in the outdoor unit.
The indoor unit transmits the indoor
room temperature and set temperature
data to outdoor unit, then the outdoor
unit controls thermoregulation.
1 Models without auxiliary heater also
control the units in the same way as
shown in the left.
2 During the over-rise prevention
control, "Airflow increasing" in the
indoor fan is controlled.
( Only the model of fan 4-speed)