Raypak WH 0195A User Manual download pdf (Page 23)

These instructions are primarily intended for the use of qualified personnel specifically trained and experienced in the

installation of this type of heating equipment and related system components. Installation and service personnel may

be required by some states to be licensed. Persons not qualified shall not attempt to install this equipment nor

attempt repairs according to these instructions.

PROBLEM(S)

1)When tankstat is turned on, heater

does not operate.

2)When tankstat is calling for heat,

pump is on, but burners will not turn

on.

CAUSE(S)

1)No power to the heater.

2)Defective tankstat or disconnected

wire in thermostat circuit.

3)Defective transformer.

1)For Standing pilot models pilot burner

not lighted.

2)If pilot burner will not stay lighted,

thermocouple or gas valve may be

defective.

3)Gas knob in "Pilot" position.

4)Vent switch is open.

5)Roll-out switch is open.

6)Manual Reset High limit is open.

7) Defective ignition module or

defective gas valve.

SOLUTION(S)

1)Check circuit breakers, disconnect

switch. Make sure power is on.

2)Check continuity on thermostat and

wiring circuit. Replace thermostat, or

repair wiring connections.

3) Check secondary voltage. If no 24V,

replace transformer.

1)Light pilot burner. (Follow lighting

instructions on rating plate).

2)Check thermocouple MV generation.

If less than 25MV (open circuit), re-

place thermocouple. If between 25-

35 MV, replace gas valve.

3)Turn knob to "ON" position.

4) Check for blockage of venting sys

tem or disconnected vent piping. After

problem is corrected push button to

reset vent switch.

5)Check for blockage of flue or sooted

heat exchanger. After problem is

corrected push button to reset

roll-out switch.

6)Check water flow and adjust to

obtain 8° to 10°F temperature rise.

7)On Honeywell module, check voltage

across terminals MV and MV/PV. If

no 24V is present, replace module. If

24V is present, replace gas valve.

TROUBLESHOOTING

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Raypak WH 0195A User Manual Page 23

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