OUTLET PRESSURE TAP
LOW PRESSURE GAUGE
18
1. Brush off any accumulation of dust that might be
found near or on the valve.
2. Check manifold gas pressure with a low pressure gas
gauge or water manometer.
a.
Shut off gas supply to inlet of heater.
b.
Disconnect heater from electrical supply.
c.
Using adjustable wrench, remove pressure tap
located at valve outlet.
d.
Thread in pressure gauge adapter and tighten.
e.
Turn on fuel supply and reconnect heater to
electrical supply.
f.
When heater lights, the gas gauge will read 11
in. W.C. (27.5 MBAR) gas pressure. This
pressure is the flowing gas pressure necessary
for the heater to deliver the maximum input
rating as indicated for each model on page 4.
If gauge does not indicate proper manifold
pressure, check inlet pressure to the gas
control valve. Maximum and minimum
acceptable inlet pressures to gas control valve
are shown in the heater specifications table.
(See page 4.) The inlet pressure may need
adjustment as necessary to achieve proper
outlet pressure.
g.
After pressure have been checked, shut off gas
supply and electrical service to heater, remove
gauge, install pressure tap plug and tighten
plug securely. Turn on gas supply and
reconnect heater to electrical supply.
FIG. 13
PRESSURE CHECKS
WARNING
Do not attempt to disassemble or replace components
on the gas control valve. Gas control valve components
are not available separately. If any component of the
valve is defective, the valve must be replaced in its
entirety. Failure to do so may result in fuel gas leakage,
leading to fire or explosion, personal injury or death.
WARNING
The pilot button on the gas control valve works with
normal finger pressure only. Do not force button with
tools. Forcing button can result in leakage of fuel gases,
leading to fire or explosion, personal injury or death. If
button cannot be depressed with normal finger pressure,
replace the valve.
