-
21
-
'10 • PAC-SM-137
A
(c) Heating high pressure protection
1) Protective
control
a) As the indoor unit heat exchanger temperature (Th
I
-R) exceeds the setting value, the compressor speed
(frequency) is controlled to suppress the rise of high pressure.
b) Control value A is updated to an optimum value automatically according to the operating conditions.
Reduces compressor frequency
at every 30 seconds.
Reset
A
Indoor unit heat exchanger temp. (°C)
2)
Anomalous stop control
Operation control function by the indoor unit controller - See the heating overload protection, page 10.
3)
Adaptation to existing piping, stop control
If the existing piping adaptation switch, SW5-1 (SW8-1: 71 type), is turned ON, the compressor stops to protect
existing piping when the indoor unit heat exchanger temperature (Th
I
-R) exceeds the setting value.
Compressor stop
Reset
Indoor unit heat exchanger temp. (°C)
47
58
(d) Anomaly detection control by the high pressure switch (63H1)
1)
If the pressure rises and operates the high pressure switch (opens at 4.15MPa/closes at 3.15MPa), the compressor stops.
2)
Under any of the following conditions,
E
40 is displayed and it enters the anomalous stop mode.
a) When it occurs 5 times within 60 minutes that pressure rises and the compressor is stopped by 63H1.
b) When 63H1 has been in the open state for 60 minutes continuously, including the stop of compressor.
(e) Low pressure control
1) Protective
control
If the value detected by the low pressure sensor (LPT) exceeds the setting value, the compressor speed (frequency)
is controlled to restrain the drop of pressure.
Retention
Reduces compressor frequency
at every 30 seconds.
Reset
0.150
0.189
Low pressure (MPa)
2)
Anomalous stop control
a) When a value detected by the low pressure sensor (LPT) satisfies any of the following conditions, the
compressor stops to run for its protection.
When the low pressure drops to 0.079MPa or under for 15 seconds continuously.
At 10 minutes after the start of compressor, the suction overheat becomes 30°C and the low pressure
becomes 0.15MPa or under for 60 seconds continuously.
b)
E
49 is displayed under any of the following conditions and it enters the anomalous stop mode.
When the low pressure drops 3 times within 60 minutes and the compressor stops under any of the above conditions.
When a value detected with the low pressure sensor becomes 0.079MPa or under for 5 minutes, including
the stop of compressor.
c) However, when the control condition a).
is established during the compressor protection start III,
E
49 is
displayed at initial stop and it enters the anomalous stop mode.
(f)
Compressor pressure ratio protection control
1)
During heating operation, if the indoor unit heat exchanger temperature (Th
I
-R) and the outdoor unit heat exchanger
temperature (Tho-R) exceed the setting values at 10 minutes after the start of compressor, the compressor speed
(frequency) is controlled to protect the compressor.
2)
This control is not performed during the outdoor fan ON and for 10 minutes from the start of outdoor unit fan.
3)
This control is not performed during defrosting operation and at 10 minutes after the reset of defrosting operation.
4)
When there are 3 indoor unit heat exchanger temperatures (Th
I
-R), the highest temperature is detected.
65
°C
33
°C
0.150
0.425
Low pressure (MPa)
Indoor unit heat e
xchanger temp. (°C)
Resert
Reduces compressor frequency at each minute.
Model
E
xisting piping adaptation switch: SW5-1 (SW8-1: model 80)
O
FF
(Shipping)
ON
Control value A (°C)
71
52~58
46~52
1
25
~140
48~54
Note (1) Adaptation to existing piping is at ON.
Summary of Contents for FDEN125VNXVD
Page 101: ... 101 10 PAC SM 137A ...
Page 106: ... 106 10 PAC SM 137A 2 Models FDC100 140VNX 100 140VSX ...
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Page 114: ... 114 10 PAC SM 137A 5 4 Electric wiring work installation ...
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