Raypak 155C installation instructions Electrical Millivolt

Leaking at well.	Overacid	Replace well and maintain water chemistry
		properly.
Leaking at heat exchanger.	Overacid	Replace heat exchanger and maintain
Gasket brittle and leaking -	Heater running after pump	chemistry properly.
(overheated).	Shuts off	See pressure switch adjustment.
	Refractory damage	Replace refractory.
	Sooted heater	Determine cause of sooting and correct.

ELECTRICAL ( MILLIVOLT)

RAYPAK POOL OR SPA HEATER ELECTRICAL

CHECK WITH MV GAS VALVE CAUTION: For qualified service personnel only.

1. Filter must be on with adequate water flow through heater.

2. Gas valve must be "ON" position. Thermostat set higher than pool water temperature.

3. Jumpers are for temporary check only. If left in place, they could cause the heater to burn up.

Light pilot

If pilot burner remains lit.

Jump across both "TH"

wires on gas valves

If main burner fires,	If main burner does not
remove jumper	fire, remove jumper

Replace

gas valve

If pilot burner goes out when main burner lights or when gas valve knob is released

Remove both "TH"

wires from gas valve.

Relight pilot

If pilot burner does not light

Check gas supply, gas line size, gas pressure. Also check for insects or debris in pilot output.

Jump across pressure

switch terminals

If pilot burner stays on

If burner does not remain

lit, attach millivolt meter

If main burner fires,

If main burner does not

and read pilot output.

remove jumper

fire, remove jumper

Problem is a wire or

component short to

If above 500mV,

Clean filter

Jump across thermostat

cabinet or low gas

replace gas valve

pressure

Check for adequate water

If below 500mV, check

flow from filter

gas pressure. Also check

for insects or debris in

Replace pressure switch

the pilot burner

If output is still low,

If main burner fires,

If main burner does

replace pilot generator.

remove jumper

NOT fire...

Replace thermostat

Jump across each high

limit and remove jumper

Replace high limit that

caused heater to fire

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