Condensing Water Heater Service Manual 12 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.
Frost Protection:
This unit has frost protection heaters mounted at
different points to protect the water heater from
freezing.
KA Series Electrical Diagnostic Points
RC98HPe, RC98HPi
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 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 B1 1-3 Bk-Bk DC10-13V
THERMAL FUSE E1 pin 1 to B1 pin 1 R-W BELOW 1 Ω
MOD. SOLE. VALVE (POV) B2 1-2 O-O DC2-15V / 67-81 Ω
MAIN SOLE. VALVE (SV0) B3 1-2 P-Bk
DC11-13V / 24-28 Ω
SOLENOID VALVE 1 B4 1-2 Bl-Bk
DC11-13V / 37-43 Ω
SOLENOID VALVE 2 B5 1-2 Y-Bk
SOLENOID VALVE 3 B6 1-2 R-Bk
SOLENOID VALVE 4 B7 1-2 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
180-207 Ω
HEAT EXCHANGER PIPING
156-180 Ω
WATER FLOW SENSOR
24-28 Ω
IGNITOR D1 1-2 Gy-Gy
AC90-110V
(DURING IGNITION)
HEAT EXCHANGER TH E2 1-2 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
OUTGOING WATER TH1 W-W E4 pins 3,4 to E8 pins 1-2
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