Hot Start (Cold Draft Prevention During Heating); Weekly Timer; Possible Joint Use Timer Operation Setting Combinations; Fm Control With The Heating Thermostat Turned Off - Mitsubishi Heavy Industries FDCA Series Technical Manual

4) Weekly Timer

Each day, it is possible to set this timer's operation up to 4 times (On time, or Off timer).

5) Possible joint use timer operation setting combinations

Simple Timer
Time Off Timer
Time On Timer
Weekly Timer
Note (1) : Possible,
(f)

Hot start (Cold draft prevention during heating)

When heating operation starts, when the thermostat is reset, during a defrosting operation or when resetting a heating opera-
tion, in order to prevent a cold draft, the indoor heat exchanger (sensed by Th
Fan
Lo
Heat exchanger temperature 35˚C or above, or 7 minutes passes
Compressor ON
(1)
Fan
Lo
Notes (1) If J2 starts, it changes from OFF to Lo for 5 minutes.
Notes (2) During Hot Start (the compressor is operating and the indoor fan is not operating at the set air flow), Heating preparation is displayed.
(g) FM control with the heating thermostat turned off (For cold draft prevention)
In order to prevent a cold draft while the heating thermostat is turned off, the indoor blower is controlled in response to the
temperature of the indoor heat exchanger as illustrated below. It should be noted that if jumer wire J2 (SW7-2) on the indoor
PCB is turned off, the indoor blower will stop so far as the temperature of the indoor heat exchanger is lower than 40˚C. It will
be turned to the Lo operation 5 minutes later.
Lo
Indoor heat exchanger temperature (˚C)
Simple Timer Time Off Timer
: Impossible
Heating start thermostat judgment
Thermostat OFF
Set air flow
35
Indoor heat exchanger (˚C)
Normal state, set air flow
Compressor OFF
Set air flow
40 45
Indoor heat exchanger (˚C)
(Setting air flow)
40 45
Time On Timer
-R1 and R2) control the indoor fan.
I
Thermostat ON
Fan
OFF
25
Indoor heat exchanger (˚C)
Heat exchanger temperature 35˚C or above, or 7 minutes passes
Defrosting starts
Fan
OFF
Indoor heat exchanger (˚C)
Note (1) After the thermostat is reset, it returns to the hot start
control.
70
- -
Weekly Timer
Set air flow
Lo
35
Set air flow
20 30
Defrosting ends