Millivolt - Flow Chart - Raypak 206A Installation And Operation Manual

Millivolt - Flow Chart

If pilot burner remains lit
Jump across both "TH"
wires on gas valves
If main burner fires,
remove jumper
Jump across pressure
switch terminals
If main burner fires,
remove jumper
Clean filter
Check for adequate water
flow from filter
Replace pressure switch
Light pilot
If main burner does not
fire, remove jumper
If main burner does not
fire, remove jumper
Jump across thermostat
If main burner fires,
remove jumper
Replace thermostat
If pilot burner goes out
when main burner lights
or when gas valve knob
is released
Remove both "TH"
Replace
wires from gas valve.
gas
Relight pilot
valve
If pilot burner stays on
Problem is a wire or
component short to
cabinet or low gas
pressure
If main burner does
NOT fire...
Jump across each
high limit and remove
jumper
Replace high limit that
caused heater to fire
Raw Output (700mV± 100)
1
Pilot generator disconnected from valve (knob
must be held down to keep pilot on).
White – Negative
Red + Positive
Pilot Load (500mV± 100)
2
Pilot generator connected to valve-Power ap-
plied to pilot solenoid.
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
Main Valve Load (200mV± 100)
3
Control/Limit circuit closed (All switches "ON")
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
If pilot burner
does not light
Check gas supply, gas
line size, gas pressure.
Also check for insects
or debris in pilot output
If burner does not remain
lit, attach millivolt meter
and read pilot output
If above 500mV,
replace gas valve
If below 500mV, check
gas pressure. Also check
for insects or debris in
the pilot burner
If output is still low,
replace pilot generator
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