EPV SERIES CONDENSING WATER BOILER
34-501 07/13
22
6. GAS HIGH FIRE INPUT CANNOT BE ACHIEVED:
a) Gas Company pressure regulator or meter operating incorrectly, not allowing required gas pressure at burner
train inlet. Contact Gas Company to correct.
b) Gas cock upstream of train inlet not fully open. Check and correct.
c) Gas line obstructed. Check and correct.
d) Gas train main and/or lead test cocks not fully open. Check and correct.
e) Gas supply line between gas company regulator and burner inlet too small. Check supply pressure at meter,
determine pressure drop and increase line size as required, or raise supply pressure to compensate for small
line. Do not raise pressure so high that under static (no flow) conditions the pressure exceeds the maximum
allowable pressure to the gas train components on the burner.
f) Automatic gas valve not opening fully due to defective operation. Replace gas valve.
g) Defective main gas pressure regulator. Replace.
h) Incorrect spring in main gas pressure regulator. Replace as required.
i) Main gas pressure regulator vent line obstructed. Check and correct.
j) Normally open vent valve (if supplied) not closing when automatic gas valves open. Replace vent valve, if not
closing fully.
k) Second stage thermostat is not properly adjusted. Second stage thermostat should be set approximately 10°F
below the primary operating thermostat.
Additional troubleshooting information can be found in the Flame Safeguard bulletin with the burner.