Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 74 / 1106

72
SRK-H
2) Function
a) The indoor fan motor is controlled in accordance with the temperature of the indoor heat exchanger to send warm air
from the start.
b) When the air flow increases at heating starting as shown below, the temperature of the indoor heat exchanger become
lower since the intake air temperature is still low. By this the fan speed is decreased. In this case, in order to prevent
excessively ON/OFF switching of the fan motor, the controlling temperature is made different from the controlling
temperature for HOT KEEP.
Note (1) W h e n t h e c o m p r e s s o r h a s
stopped, the indoor fan will stop
at 30˚C
(b) HOT SPURT
1) Operation timing
When starting operation. (during start-up)
2) Function
The set temperature of the thermostat is increased by
2˚C
to stabilize the room temperature quickly. When starting
heating, since the surrounding wall and furniture is cold, if the
compressor is stopped by thermostat, the 3 min. delay timer operates, the temperature drops rapidly during the 3 min, and
although the thermostat has to resume operation, air conditioner would not start for those 3 min. (where marked *)
(c) HOT KEEP
1) Cold draft prevention (I)
a) Operation timing: While defrosting operation
b) Function: The indoor fan is stopped and RUN (HOT KEEP) lamp flashing.
2) Cold draft prevention (II)
a) Operation timing: When thermostat is switched to “off”.
b) Function: The indoor fan operates as shown
below, and after the passage of a period of
either 5 minutes return to thermo. Control at
speed 2 operation.
Notes (1) When the thermostat does not reset within 5 minutes, reset it by operating the indoor fan motor at speed 2.
(2) Refer to above explanation of HOT START function.
(3) The * marked speed 2 operation shows the case in which the thermostat is switched to off. While the defrosting operation the * marked operation
are not performed.
20 30 37 43
(30)
(1)
Temperature of indoor heat exchanger (˚C)
Operation of the indoor fan motor
Indoor fan Off
Off
Speed 2
Speed 2
Set fan speed
Set fan speed
Compressor stop
Stabilizing curve with
conventional unit
Stabilizing curve with
HOT SPURT.
Time
Setting temp.
Room temp.
Com-
pressor
Indoor
fan
motor
Set fan speed Stop Set fan speed
HOT
START
*Approx 5 min (1)
(Approx. 3min.)
1 min.
Temperature of the indoor heat exchanger (˚C )
Speed
2
Speed
2
*Thermostat setting is increased by 1˚C.