40
Rinnai Direct Vent Service Manual
RHFE-201FA
Troubleshooting
(AC
IN)
(Connector
B)
Black-White
120 VAC
CONNECTOR B
Pin # 1-2
Black-Ground
120 VAC
Pin #2-Ground
White-Ground
0 VAC
Pin #1-Ground
(TR) Transformer:
(Connector C) (AC Out)
Read voltage across:
Voltage Potential
Read resistance
Pin Numbers
Grey-Grey 90-110
VAC
3-6
Ω
Pin
#1-7
Red-Yellow 30-42
VAC
0.8-1.5
Ω
Pin
#4-5
Blank pin-Grey
15-21 VAC
0.6-1.2
Ω
Pin
#6-7
Grey-Black 180-220VAC
155-260
Ω
Pin
#7-8
(SP) Sparker:
(Connector D) (Voltage potential while Sparking)
Read voltage across:
Voltage Potential
Read resistance
Pin Numbers
Red-Blue 85-100
VAC
100K-120K
Ω
Pin
#3-6
The spark must be sensed as being at the correct location and intensity before it will allow the gas valve to open. Check
across Pin # 1-2 at Connector F and you should read 4-6 VDC potential. When sparking, if the spark is in the right location and
intensity the voltage potential will drop to almost 0 (zero) and then return to the 4-6 VDC potential.
(SV1 and SV2) Main Solenoid Valves: (Connector D)
Read voltage across:
Voltage Potential
Read resistance
Pin Numbers
Black-Yellow 85-90
VDC
700-1000
Ω
Pin
#1-4
*Resistance across each coils terminals should be 1400-2000
Ω
when isolated.
(POV) Modulating Gas Valve (Connector G)
Read voltage across:
Voltage Potential
Read resistance
Pin Numbers
Grey-Grey 6-16
VDC
80-90
Ω
Pin
#2-6
(BL) Combustion Blower Motor:
(Connector G) DC Motor 37VDC 8 Watts
Read voltage across:
Voltage Potential
Read resistance
Pin Numbers
Black-White 7-12
VDC
8K-10K
Ω
Pin
#7-8
Yellow-White 4-5
VDC
4K-6K
Ω
Pin
#4-8
Red-White
10-30 VDC
N/A
Pin # 3-8
WARNING
There are a number of live tests that are required when fault finding this product. Extreme care should be used at
all times to avoid contact with energized components inside the furnace.
You MUST be a qualified service person before proceeding with these test instructions.
Before checking resistance readings, turn off power source to unit and then isolate each item to be checked from
the circuit by unplugging it.
When setting gas pressures on one of these units, please check the complete model number you are trouble-
shooting. Gas pressures and dip switches can vary among models. Always check the rating plate for complete
information and follow directions.
Содержание RHFE-431WTA
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