POWER VTX
®
WATER HEATER
43
PV500-68 06/16
20. If the burner fails to light, the flame control will recycle two more times before lockout unless the POWER VTX
®
contains the CSD-1 option. There is only a single try for ignition with the CSD-1 option. When lockout occurs,
cycle the main power switch to reset the flame ignition control before the alarm-on-any-failure occurs. When the
burner fails to ignite, the most common cause at startup is air in the gas supply. This can usually be corrected
with multiple cycles or bleeding the line manually. If the burner lights but blows out, ensure that the burner firing
rate is locked in low fire and check for improper combustion or weak flame signal as a possible cause.
21. Burner Combustion Adjustment
Burner combustion must only be adjusted using a combustion analyzer
. Do not attempt to adjust burner
by sound or sight. With the burner firing, insert the combustion analyzer probe in the flue vent approximately
two feet from the appliance.
The heater is adjusted as follows:
With the burner firing, adjust the valve orifice screw counter-clockwise to increase gas flow or clockwise to
decrease flow. The desired CO2 in the combustion products must be between 8.5 and 9.5% for natural gas and
between 9.5 to 10.5% for LP gas. Do not attempt to adjust combustion based on manifold pressure alone.
Manifold pressure should only be used as a reference point. It should not be necessary to adjust the regulator
for this model.
See Gas Train Illustrations for details.
WARNING: Do not continue to operate the appliance with carbon monoxide levels above 200 ppm.
Carbon monoxide is a colorless, odorless and poisonous gas that commonly results from gas
combustion. High concentrations of Carbon Monoxide are extremely dangerous to humans and
animals. Operation of an appliance at carbon monoxide levels above 200ppm can cause unsafe
operation and the potential for poisonous carbon monoxide to enter occupied areas. Such improper
installation can cause property damage, personal injury, exposure to hazardous materials or death.
22. Enable or reconnect any BMS/BAS control interface removed prior to the setup and adjustment of each water
heater.
Gas Train Illustration for Model 50, 75 & 100
(Optional components may not be shown)
