Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 38

(ii) Contents of operation
1) Air capacity control
Item
Upper limit of compressor's command speed
Note (1) Ranges A and B are as shown below.
Range A
Cancel
63
Humidity (%)
2) When this control has continued for more than 30 minutes continuously, the following wind direction control
is performed.
a) When the vertical wind direction is set at other than the vertical swing, the flaps change to the horizontal position.
b) When the horizontal wind direction is set at other than the horizontal swing, the louver changes to the ver-
tical position.
(iii) Reset conditions
When any of followings is satisfied.
1) Compressor's command speed is less than 28 rps.
2) Detected value of humidity is less than 63%.
(b) Frost prevention control
(i) Operating conditions
1)
2)
(ii) Detail of anti-frost operation
Indoor heat exchanger
Item
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
(iii) Reset conditions
1)
2)
(c) Cooling overload protective control
(i) Operating conditions:
Item
Range A
(1)
Range B
● Condition for
Compressor's command speed is controlled according to the indoor
Range B
unit heat exchanger temperature (Th2) and the indoor unit room
temperature (Th1).
68 78
Th2 ≦ Th1 ‒ 10
Th1 ‒ 10 ＜ Th2 ≦ Th1 ‒ 6
Th2 ‒ 6 ＜ Th1
temperature 5°C or lower
12 rps
37
-
more, with the compressor running, the lower limit
Model
SRK63, 71, 80ZM-S
Model
SRK100ZR-W
Follow the table below
56rps
Range A
Condition Compressor's command speed
・ Decreases the compressor's target max speed
by 4 rps.
・ If the condition is met still 20 seconds later,
the speed is decreased further by 4 rps. This
process is repeated further so far as the
condition is met. (Lower limit is 30 rps.)
Compressor's target max. speed or changed
value of the same is maintained.
Changed compressor's target max. speed is
increased at a rate of 1 rps/20 seconds.
2.5°C or lower
-
'19 • PAC-SM-334
'09•SRK-DB-087D
Compressor
command
speed
Lower
limit
speed
0 rps
2.5 5
Indoor heat exchanger
temperature (ºC)
ON1
8
ON2