GCH15010
49
0
10
20
30
40
50
-20 -10 0
10 20 30 40 50
Temperature (°C)
5HVLVWDQFHNȍ
0
100
200
300
400
500
600
-20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
5HVLVWDQFHNȍ
0
10
20
30
40
50
60
70
80
-20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
5HVLVWDQFHNȍ
Part Name
Check Points
3-way valve
A
B
AB
A
A
B
A
B
Motor
Valve
Indicator (red)
Release button
B
<DHW>
<Heating>
AB
(1) Check the movement of the red indicator. The red indicator normally points
to A in DHW mode and to B in Heating mode as shown to the left.
(2) If each indicator position is correct but the 3-way valve does not work prop-
pressing the release button, and reinstall it.
Thermistors
Disconnect the connector then measure the resistance with a tester.
(At ambient temperatures of 10 - 30°C.)
<Thermistor Characteristics Charts>
0°C
Nȍ
10°C
Nȍ
20°C
Nȍ
25°C
Nȍ
30°C
Nȍ
40°C
Nȍ
Thermistor R0 = 15k
ȍ
± 3%
B constant = 3480 ± 2%
Rt = 15exp {3480 (
273+t
–
273
)}
1
1
erly, the motor may not fit onto the valve securely, so remove the motor by
5RRPWHPSHUDWXUHWKHU
0°C
Nȍ
10°C
Nȍ
20°C
Nȍ
30°C
Nȍ
40°C
Nȍ
50°C
Nȍ
60°C
Nȍ
70°C
Nȍ
80°C
Nȍ
0°C
Nȍ
10°C
Nȍ
20°C
Nȍ
30°C
Nȍ
40°C
Nȍ
50°C
Nȍ
60°C
Nȍ
70°C
Nȍ
80°C
Nȍ
Thermistor R0 = 17.6k
ȍ
± 3%
B constant = 3970 ± 2%
Rt = 17.6exp {3970 (
273+t
–
323
)}
1
1
)ORZZDWHUWHPSHUDWXUHWKHU:
5HWXUQZDWHUWHPSHUDWXUHWKHU:
)ORZZDWHUWHPSHUDWXUHWKHUPLVWRU:
'+:VXSSO\WHPSHUDWXUHWKHU:
Thermistor R0 = 5.1k
ȍ
± 2%
B constant = 3300 ± 2%
Rt = 5.1exp {3300 (
273+t
–
318
)}
1
1
6WRUHGZDWHUWHPSHUDWXUHWKHUPLVWR:$
6WRUHGZDWHUWHPSHUDWXUHWKHUPLVWR:%
Thermistor Normal
Abnormal
TH1
THW1
THW2
THW3
THW4
THW5A
THW5B
Nȍ
Nȍ
Nȍ
Open or short
Open or short
Open or short
