Protection Control Function - Mitsubishi Heavy Industries SRC25ZMP-S Technical Manual

(12) Protection control function

(a) Dew prevention control [Cooling]:Prevents dewing on the indoor unit.
(i) Operating conditions:When the following conditions have been met for more than 30 minutes after starting operation
1) Compressor's command speed is 32 rps or higher. (SRK25, 35 only)
2) Detected value of humidity is 68% or higher.
(ii) Contents of operation
1) Air capacity control
Item
LO
AUTO,HI,MED
Note (1) Ranges A and B are as shown below.
Range A
2) When this control has continued for more than 30 minutes continuously,the following wind direction control is per-
formed.
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 vertical po-
sition.
(iii) Resetting condition:When any of followings is metdirec
1) Compressor's command speed is less than 32 rps. (SRK25, 35 only)
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:
Upper limit of compressor's command speed
Indoor fan
Upper limit of compressor's command speed
Indoor fan
Range B
68 73
Humidity(%)
temperature
5°C or lower
more, or 47ºC or more (model SRK50 : 41ºC or more) with the compressor running, the lower
limit
Model
SRK25, 35ZMP-S
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 34rps
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 34rps
Adaptable to compressor's command
speed (Lower limit 4th speed)
2.5°C or lower
33
- -
'13 • SRK-T-140
SRK45ZMP-S
4th speed
'09•SRK-DB-087D
compressor
command
speed
Lower
limit
speed
0 rps
2.5 5
Indoor heat exchanger
temperature (ºC)
8