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
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