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Gas Pressure Checks
WARNING
Burn Hazard
■ Do not disassemble the gas control valve.
■ Do not attempt to replace any components of the
gas control valve.
■ The gas control valve must be replaced if any
physical damage occurs to the control valve
assembly.
■ Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans,
and property damage.
ATTENTION
■ The following explains a typical procedure to be followed
in checking gas pressures.
■ The gas pressures will vary depending upon fuel type.
■ Consult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure.
■ Gas pressure measured at the inlet to the gas valve is
Inlet Pressure and gas pressure measured at the outlet
of the gas valve is Burner Manifold Pressure.
MATERIALS REQUIRED
Quantity
Description
2
Gas pressure gauges capable of reading
up to 35 in.W.C./8.7 kPa. (Available from
L.B.White Company if desired).
A. Preparation
1. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater.
2. Open the burner end door of the heater.
3. Brush or blow off any dust or dirt in the vicinity of the gas
control valve.
B. Gauge Installation
1. Locate the gas control pressure tap, see Fig. 28 and
remove the pressure tap plugs using a 3/16 in. Allen key.
2. Securely connect pressure gauges at these points.
3. Open the fuel supply valves to the heater and reconnect
the heater electrical supply.
4. Start the heater
Owner's Manual • Premier Ductable Heater
Premier Ductable Heater
FIG. 28
OUTLET PRESSURE
TAP
GAUGE AT VALVE OUTLET
C. Reading Pressures
1. With the heater operating, the pressure gauges should read
the pressures specified on the dataplate.
2. Do the readings at the inlet and outlet pressure gauges
agree with that specified on the dataplate? If so, then no
further checking or adjustment is required. Proceed to
section D.
3. If the inlet pressures do not agree with that specified on the
dataplate, then the regulator controlling gas pressure to the
heater requires adjustment.
4. If the inlet pressure is correct but the burner manifold
pres- sure does not agree with that specified on the
dataplate, then the gas control valve's internal pressure
regulator needs adjustment:
-- Remove the regulator cap on the control valve.
-- Using a standard screwdriver turn the adjusting screw
clockwise (to increase pressure) or counter-clockwise
(to decrease pressure) until the burner manifold
pressure is set.
-- Install regulator cap.
-- Proceed to COMPLETION.
D. Completion
1. Once the proper inlet and burner manifold pressures have
been confirmed and/or properly set, close the fuel supply
valve to the heater and allow the heater to burn off any gas
remaining in the gas supply line.
2. Disconnect the heater from its electrical supply and close
fuel supply valve.
3. Remove the gauges.
4. Install pressure tap plugs.
5. Open fuel supply valve and reconnect electrical supply to
heater. Start the heater and check for gas leaks.
6. Set thermostat to desired temperature.
INLET PRESSURE
TAP
GAUGE AT VALVE INLET
INTERNAL PRESSURE REGULATOR
23
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