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Abnormal point and detection method
Error Code
Freezing/overheating protection is working
(1) Freezing protection
<Cooling mode>
Abnormal if plate heat exchanger pipe
temperature thermistor (TH6) stays at
-5: or lower for 10 seconds or abnormal
if plate heat exchanger pipe thermistor
(TH6) stays at -2: or lower and com-
pressor operation frequency is minimum
for 5 minutes after compressor starts
operating for 6 minutes.
<Heating mode>
Abnormal if inlet water temperature ther-
mistor (TH32) is 15: or lower, and the
following condition (1 or 2) are detected.
1. 1 minute has passed since defrost-
ing operation started and plate heat
exchanger pipe temperature thermistor
(TH6) stays at -6: or lower for con-
tinuously 30 seconds.
2. During defrosting operation and plate
P6
heat exchanger pipe temperature ther-
mistor (TH6) stays at -16: or lower
for continuously 10 seconds.
(2) Overheating protection <Heating mode>
Abnormal if condensing temperature of
pressure sensor (63HS) detects
Tcond. : or more and compressor oper-
ation frequency is less than or equal to
30 Hz. Detection is inoperative during
defrosting.
Pipe temperature
Abnormal if the following conditions are
detected for continuously 3 minutes after
compressor starts operating for 10 minutes.
1. Cooling mode
-TH7 [ 2: and
T
63HS
TH3-TH7 [ 4: or T
TH32-TH6 [ 0: and
Compressor operation frequency is 61Hz or more.
2. Heating mode
-TH32 [ 2: and
T
63HS
TH6-TH32 [ 1: and
P8
TH7-TH3 [ 1: and
Compressor operation frequency is 61Hz or more.
T
: Condensing temperature of pressure
63HS
sensor (63HS)
Thermistor
TH3: Liquid temperature
TH32: Inlet water temperature
TH6: Plate HEX Liquid temperature
TH7: Ambient temperature
(1) Freezing protection
<Cooling mode>
1 Reduced water flow
· Clogged filter
· Leakage of water
2 Low temperature
· Low-load
· Inlet water is too cold.
3 Defective water pump
4 Defective outdoor fan control
5 Overcharge of refrigerant
6 Defective refrigerant circuit
(clogs)
7 Malfunction of linear expansion
valve
<Heating mode>
1 Reduced water flow
· Clogged filter
· Leakage of water
2 Low temperature
· Low-load
· Inlet water is cold.
3 Defective water pump
4 Leakage or shortage of refrig-
erant
5 Malfunction of liner expansion
valve
(2) Over heating protection
<Heating mode>
1 Reduced water flow
· Clogged filter
· Leakage of water
2 High temperature
· Over-load
· Inlet water is too warm.
3 Defective water pump
4 Overcharge of refrigerant
5 Defective refrigerant circuit
(clogs)
6 Malfunction of liner expansion
valve
Tcond
stage-e
stage-f
stage-g
-19
-18
-16 -15
stage-a stage-b stage-c stage-d stage-e stage-f stage-g
Tcond
1 Leakage or shortage of
refrigerant
2 Malfunction of linear
expansion valve
-TH3 < 0: and
3 Refrigerant circuit is clogged
63HS
with foreign objects.
w Clogging occurs in the parts
which become below freezing
point when water enters in
refrigerant circuit.
4 Disconnection of thermistor
holder.
Case
stage-c
stage-d
-13 -12
-11 -10
Ambient temperature (TH7)
63
61
59
57
21
Judgment and action
(1) Freezing protection
<Cooling mode>
12 Check water piping.
3 Check water pump.
4 Check outdoor fan motor.
5~7 Check operating condition of refrigerant
circuit.
7 Check linear expansion valve.
<Heating mode>
12 Check water piping.
3 Check water pump.
4 Correct to proper amount of refrigerant.
5 Check linear expansion valve.
Refer to 8-5.
(2) Over heating protection
<Heating mode>
12 Check water piping.
3 Check water pump.
45 Check operating condition of refrigerant cir-
cuit.
6 Check liner expansion valve.
stage-a
stage-b
-8
-7
-3
-2
[
]
54
51
48
1 Check intake superheat.
Check leakage of refrigerant.
2 Check linear expansion valve.
3 After recovering refrigerant, remove water
from entire refrigerant circuit under vacuum
more than 1 hour.
4 Check temperature display on outdoor
controller circuit board.
Temperature display is indicated by setting
SW2 of outdoor controller circuit board.
Check the holder of thermistor.
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