Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 17

(ii) Contents of operation
1) Air capacity control
Item
Upper limit of command compressor speed
Note Ranges A and B are as shown below.
Range A
Cancel
63
2) When this control has continued for more than 30 minutes continuously, the following wind direction control is
performed.
When the vertical wind direction is set at other than the vertical swing, the flaps change to the horizontal position.
(iii) Reset conditions
When either of the following conditions is satisfied
1) Command compressor speed is less than 20 rps.
2) Detected value of humidity is less than 63%.
(13) Outline of dehumidifying (DRY) operation (14) Outline of dehumidifying (DRY) operation
(a) Purpose of DRY mode
The purpose is "Dehumidification", and not to control the humidity to the target condition.
Indoor/outdoor unit control the operation condition to reduce the humidity, and also prevent over cooling.
(b) Outline of control
(i) Indoor fan speed and compressor are controlled by the area which is selected by the temperature difference.
(ii) The indoor unit check the current area by every 5 minutes, and operate by the next checking.
(c) Other
When the outdoor air temperature and room temperature is low in cooling operation, indoor unit can not operate in cooling,
and dehumidify. In this case, the units operate in heating to rise the indoor air temperature and after that start DRY operation.
Range B
68 78
Humidity (%)
Indoor fan speed
D
Indoor
fan speed
Stop
Compressor
speed
Stop
Difference between set temperature and indoor air temperature
Model
(1)
Range A: As per following table, Range B: 40 rps
● Condition for range A
Command compressor speed is controlled according to the indoor
unit heat exchanger temperature (Th2) and the indoor unit room air
temperature (Th1).
Condition
・ D ecreases the target max. compressor speed
・ If the condition is satisfied still 20 seconds
Th2 ≦ Th1 ‒ 10
Th1 ‒ 10 ＜ Th2 ≦ Th1 ‒ 6
Th1 ‒ 6 ＜ Th2
Area
C B
ULo speed
Limited （Lower than
normal cooling operation）
Limited
Minimum （Lower than the speed in"Area A"）
Setting temperature
16
- -
'22 • PAC-SM-422
SRK100ZR-W
Command compressor speed
by 4 rps.
later, the speed is decreased further by 4 rps.
This process is repeated further so far as the
condition is satisfied. 〔 Lower limit is 20 rps. 〕
Target max. compressor speed or changed
value of the same is maintained.
Changed target max. compressor speed is
increased at a rate of 1 rps/20 seconds.
A
Lo speed