Condensing Water Heater Service Manual
10
100000354
Heat Exchanger and Outgoing Water Temperature
Thermistors:
Check all thermistors by inserting meter leads into
each end of the thermistor plug. Set your meter to the
20 K scale and read resistance. Applying heat to the
thermistor bulb should decrease the resistance.
Applying ice to the thermistor bulb should increase the
resistance.
*Example:
140°F = 2.2 ~ 2.7K
221°F = 0.6 ~ 0.8K
59°F = 11.4 ~ 14K
86°F = 6.4 ~ 7.8K
113°F = 3.6 ~ 4.5K
KA Series Electrical Diagnostic Points
RC80HPe, RC80HPi
Frost Protection:
This unit has frost protection heaters mounted at
different points to protect the water heater from
freezing.
Amp Fuses:
This unit has one inline (7) amp glass fuse. Remove
the fuse and check continuity through it. If you have
continuity through the fuse then it is good. Otherwise
the fuse is blown and must be replaced.
Flame Rod:
Place one lead of your meter to the flame rod and the
other to ground. With the unit running you should read
between 5
-
150 VAC. Set your meter to the micro amp
scale. You should read a minimum of 1 micro amp for
proper flame circuit. In the event of low flame circuit
remove the flame rod and check for carbon or damage.
COMPONENT
MEASUREMENT POINT
RANGE OF VALUE
CN
PINS
WIRE COLOR
TEMP CONTROLLER
A
1
-
3
Bk
-
Bk
DC10
-
13V
THERMAL FUSE
B1 pin1 to E1 pin 1
R
-
R
BELOW 1 Ω
MOD. SOLE. VALVE (POV)
B2 (1
-
2), B (10
-
11)
B2: O
-
O
DC2
-
15V / 67
-
82 Ω
MAIN SOLE. VALVE (SV0)
B5 (1
-
2), B (7
-
8)
B5: P
-
Bk
DC11
-
13V / 37
-
43 Ω
SOLENOID VALVE 1
B6 (1
-
2), B (6
-
7)
B6: B
-
Bk
SOLENOID VALVE 2
B7 (1
-
2), B (5
-
7)
B7: Y
-
Bk
SOLENOID VALVE 3
B3 (1
-
2), B(4
-
7)
B3: R
-
Bk
SOLENOID VALVE 4
B4 (1
-
2), B(3
-
7)
B4: O
-
Bk
SURGE PROTECTOR
C1
1
-
3
Bk
-
W
AC108
-
132V
SURGE PROTECTOR
C2
1
-
3
W
-
W
ANTI FROST HEATER
HOT WATER OUTLET LINE
10
-
20 Ω
HEAT EXCHANGER PIPING
35
-
50 Ω
WATER FLOW SENSOR, HOT WATER OUT-
LET, DRAIN CONNECTION
110
-
150 Ω
LATENT HEAT EXCHANGER (INDOOR MOD-
EL ONLY)
90
-
110 Ω
IGNITOR
D1
1
-
2
Gy
-
Gy
AC108
-
132V
(DURING IGNITION)
HEAT EXCHANGER TH
W
-
W
15ºC/59ºF: 11.4
-
14.0 kΩ
30ºC/86ºF: 6.4
-
7.8 kΩ
45ºC/113ºF: 3.6
-
4.5 kΩ
60ºC/140ºF: 2.2
-
2.7 kΩ
105ºC/221ºF: 0.6
-
0.8 kΩ
E2 (1, 2), E(5
-
10)
OUTGOING WATER TH1
E3
1
-
2
W
-
W
OUTGOING WATER TH2
E4
3
-
4
W
-
W
Summary of Contents for Circ-Logic RU80e
Page 16: ...Condensing Water Heater Service Manual 16 100000354 KA Series Wiring Diagram RC80HPe RC80HPi ...
Page 17: ...Condensing Water Heater Service Manual 17 100000354 KA Series Wiring Diagram RC98HPe RC98HPi ...
Page 18: ...Condensing Water Heater Service Manual 18 100000354 KB Series Wiring Diagram RU80i e RU98i e ...
Page 57: ...Condensing Water Heater Service Manual 57 100000354 Notes ...
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