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80
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(v)
High pressure control
⽧
Models FDCA301~601 only
1) Heating
a) After the compressor starts, the temperature at the indoor heat exchanger temperature (ThI-R) is checked,
and when all the following conditions are met, the electronic expansion valve (EEV) is controlled to control
the high pressure rise.
1
The indoor heat exchanger temperature (ThI-R) is 60 (56)ºC or higher while the compressor is running.
2
The electronic expansion valve’s (EEV) opening angle is 470 pulses or lower.
b) This control ends when the indoor heat exchanger temperature (ThI-R) becomes 57 (54) ºC or lower.
Note (1) Values in ( ) show the setting when DIP switch SW 5-3 is ON. (It is normally OFF.)
2) Cooling
a) After the compressor starts, when all the following conditions are met, the electronic expansion valve
(EEV) is controlled to control the high pressure rise.
1
The outdoor heat exchanger temperature (Tho-R) is 58ºC or higher while the compressor is running.
2
The outdoor air temperature (Tho-A) is 41ºC or higher.
3
The outdoor fan motor runs continuously for 30 seconds or longer at the UHi tap.
4
The electronic expansion valve’s (EEV) opening angle is 470 pulses or lower.
b) This control ends when the temperature at the outdoor heat exchanger (Tho-R) becomes 53ºC or lower.
3) High pressure abnormal
a) Heating, cooling
1
If the high pressure switch (63H1) opens (4.15 MPa), the compressor stops (the outdoor unit’s fan
motor stops after running for 30 seconds longer). After a 3-minute delay, when the high pressure switch
(63H1) is restored to the closed state (3.15 MPa), the compressor restarts. If the same condition occurs
5 times within 60 minutes after the first detection, an abnormal stop is performed and an error message
(E40) is displayed.
b) Cooling
1
If the outdoor heat exchanger temperature (sensed by Tho-R) is 65ºC or higher 5 times within 60
minutes while the compressor is operating, or if that temperature is detected continuously for 60 min-
utes, an abnormal stop is performed.
2
If the outdoor heat exchanger temperature becomes 48ºC or lower, it becomes possible to reset the unit
using the remote control unit.
⽧
Models FDCA801, 1001 only
1) High pressure control during heating
a) When the pressure at the high pressure switch (63H2) during operation in the heating mode is 3.24 MPa or
higher, the outdoor fan and electronic expansion valve (EEVH1, 2)for heating are controlled and increases
in the high pressure are prevented.
b) When either of the following conditions exists
1
This control ends when pressure at the high pressure switch (63H2) drops to 2.65 MPa or lower.
2
If this control continues intermittently for 30 minutes, this control ends and the compressor is stopped.
2) Abnormality detection control using the high pressure switch (63H1)
If the high pressure switch (63H1) is open (4.15 MPa), the compressor stops. After a 3-minute delay, when the
high pressure switch (63H1) recovers (3.15 MPa), the compressor is restarted. If this condition is detected 5
times within 60 minutes after it is detected the first time, an abnormal stop occurs and an error message (E40)
is displayed.
3) Abnormal high pressure control using the outdoor heat exchanger temperature (Tho-R1, R2)
a) If the outdoor heat exchanger temperature sensors Tho-R1 or Tho-R2 detect a temperature of 65ºC or
higher in the cooling mode during compressor operation, stop control is carried out. This control ends when
the outdoor heat exchanger temperature drops to 48ºC or lower.
b) When an outdoor heat exchanger temperature of 65ºC or higher (Tho-R1, R2) is detected 5 times in 60
minutes, or if it is detected continuously for 60 minutes, including when the compressor is stopped, an
abnormal stop (E35) occurs.
(vi) Abnormal low pressure detection control (FDCA801, 1001 only)
1) The compressor is stopped when the following conditions are satisfied.
1
When the low pressure sensor detects a pressure of 0.079 MPa or lower continuously for 15 seconds after the
compressor starts operating.
2
Superheat (SH) rises to 30ºC or higher continuously for 60 seconds when the pressure detected by the low
pressure sensor is 0.120 MPa or lower 10 minutes or longer after the compressor starts.
2) The compressor recovers when the pressure detected by the low pressure sensor rises to 0.128 MPa or higher.
3) If the condition in
1
or
2
of item 1) above is detected 3 times within 60 minutes, or if a pressure of 0.079 MPa or
lower is detected continuously for 5 minutes or longer by the low pressure sensor, an abnormal stop (E49) occurs.
