Raypak 090A, 195A, 135A manual Trouble Shooting Guide, Important Notice

5. TROUBLE SHOOTING GUIDE

IMPORTANT NOTICE

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.

CAUSE(S)

1)No power to the heater.

2)Defective tankstat or disconnected wire in thermostat circuit.

3)Defective transformer.

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.

2)When tankstat is calling for heat, pump is on, but burners will not turn on.

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)Fast Response Temperature Sensor probe is defective.

8)Fast Response Temperature sensor board is defective.

9) Defective ignition module or defective gas valve.

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 system

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)Red LED on circuit board will be ON to indicate a loose sensor connection or a shorted sensor. Check terminal connectors or replace sensor as re- quired.

NOTE: Red LED will also be ON if sensor temperature exceeds 300°F or drops below - 20°F. It will turn OFF when sensor temperature returns to the proper range. Yellow LED will be ON, if temperature exceeds 210°F. When ei- ther Red or Yellow LED is ON, heater will be shut down.

8)Check voltage across output and common terminals. If no 24V is pres- ent, replace board.

9)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.

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