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[ VII Control ]
[2] Operating characteristics and Control Capabilities
Outline of Control Method
-1- Operating characteristics
Function
Component
Unit
Pressure
protection
switch
Compressor overcurrent relay
Built-in thermistor on the fan
motor (Stops the motor)
Thermis-
tor
Refrigerant
Liquid injection circuit
circuit
control
Pump
Inlet (freeze-up protection)
control
Outside temperature thermis-
tor
Freeze-up protection circuit
HWE15070
Symbol
High-pressure
63H1
switch
High-pressure
63HS
sensor
Low-pressure
63LS
sensor
Discharge refrig-
TH1
erant temp.
TH5
(Discharge temp.
overrise protec-
tion)
Air-side HEX inlet
TH4
temp.
TH8
(vacuum protec-
tion)
Suction temp.
TH2
(vacuum and
TH6
freeze-up protec-
tion)
Compressor shell
TH3
temp.
TH7
(compressor
floodback protec-
tion)
Inverter heatsink
THHS
temp
LEV2
SV2
TH16
TH12
TH9
Control/
Ac-
Unit
Detection
tion
HP 63H1
ON
MPa
OFF MPa
HP 63HS
OFF MPa
LP
63LS
OFF MPa
Compressor
OFF
A
current
Built-in
ON
ºC
thermistor on
the fan motor
OFF
ºC
Discharge
OFF
ºC
gas temp.
Air-side HEX
OFF
ºC
A heat-side heat exchanger inlet temperature of
inlet temp.
-33ºC was detected.
Suction gas
OFF
ºC
A suction gas temperature of -36ºC was detected.
temp.
Comp. shell
OFF
ºC
A shell bottom SH temperature of 10ºC or below
temp.
has been detected for 40 minutes while the com-
pressor is in operation.
INV. heat-
OFF
ºC
A temperature of 80ºC or above has been detected
sink temp.
for 10 minutes or a temperature of 90ºC or above
was detected.
Discharge
ºC
Injection is controlled by referencing the discharge
gas temp.
gas temperature.
Water inlet
ON
ºC
OFF
ºC
Outside
ON
ºC
temp.
OFF
ºC
The pump turns on when the water inlet tempera-
ture has reached below the "ON" threshold AND
the outside temperature has reached below the
"ON" threshold when the compressor is stopped.
- 88 -
Trigger condition
(2.95)
3.85
-
The low pressure has dropped below 0.06 MPa
within 30 seconds of compressor start-up.
The low pressure has dropped below 0.06 MPa
within 30 seconds of a defrost cycle.
During water heating, the low pressure has
dropped by 0.02 MPa after the air-side heat ex-
changer inlet temperature has reached -31ºC.
During water heating, the low pressure has
dropped by 0.02 MPa after the air-side suction
pipe temperature has reached -33ºC.
The outside temperature of 10ºC or above has
been detected for 20 minutes and the low pres-
sure has dropped below 0.06 MPa during water
heating.
33
90
15
145
5
A discharge gas temperature of 120ºC or above
has been detected for 30 seconds while the com-
pressor is in operation. (Preliminary abnormal
stop)
If this happens three times, the unit will make an
abnormal stop.
If a discharge gas temperature of 125ºC or above
was detected, the unit will make an abnormal
stop.
3
5
1
3
GB
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Troubleshooting
