■
The following explains a typical procedure to be followed in
checking gas pressures.
■
The gas pressures will vary depending upon country, gas
category and 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.
A. Preparation
1. Obtain two pressure gauges capable of reading up to
8.7 kPa.
2. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.
3. Open the burner access panel.
4. Brush or blow off any dust and dirt on or in the vicinity of
the gas control valve.
B. Gauge Installation
1. Locate the inlet and outlet pressure taps, see Fig.23.
Turn screws internal to the pressure taps at least one
full turn counterclockwise.
2. Securely connect a pressure gauge to each pressure
tap.
3. Open the fuel supply valves to the heater and reconnect
the heater electrical supply.
4. Start the heater.
C. Reading Pressures
1. With the heater operating, the pressure gauges should
read the pressures specified on page 4.
2. Do the readings at the inlet and outlet pressure gauges
agree with that specified on page 4? 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
page 4, then the building system regulator controlling
gas pressure to the heaters requires adjustment.
4. If the inlet pressures are correct and the burner
manifold pressure does not agree with that specified on
page 4, then the gas control valve’s internal pressure
regulator requires adjustment. See Fig.24 for regulator
location.
D. Completion
1. Once 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.
3. Remove the gauges and connecting hoses.
4. Tighten the pressure tap screws by turning clockwise.
Check for gas leaks to insure the tap screws have seated
properly.
FIG. 23
FIG. 24
GAS PRESSURE CHECKS
WARNING
Fire and Explosion Hazard
■
Do not disassemble the gas control valve or attempt to
replace any components on the gas control valve.
■
Replace the gas control valve if any physical damage
occurs to the control valve.
■
Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans and
livestock, and building damage.
OUTLET PRESSURE
TAP SCREW
INLET PRESSURE
TAP SCREW
LOW PRESSURE GAUGE
LOW PRESSURE GAUGE
INTERNAL PRESSURE
REGULATOR
OUTLET PRESSURE TAP
INLET PRESSURE TAP
OFF
ON
5
0
10
15
20
25
30
35
5
0
10
15
20
25
30
35
16
