LOW PRESSURE GAUGE
LOW PRESSURE GAUGE
PLUG
NIPPLE
TEE
TO GAS
SUPPL
Y LINE
0
5
15
10
25
35
20
30
5
15
25
0
10
35
30
20
ATTENTION
■
This procedure is to be done once a year prior to the
heating season, anytime the heater is relocated from
one job location to the next, or after servicing the
heater.
■
Gas pressure measured at the inlet to the heater is inlet
pressure and gas pressure measured at the outlet of
the regulator on the heater is burner manifold pressure.
MATERIALS REQUIRED
(To be secured through local purchase)
Quantity
Description
2
Low Pressure Gas Gauge capable of
reading up to 35 in. W.C.
1
3/8 in. Tee
1
3/8 in. Nipple
1
3/8 in x 1/8 in Reducing Bushing
A. PREPARATION
1.
Close fuel supply valve to heater.
2.
Allow heater to burn off gas remaining in it’s gas
supply line.
3.
Position pilot control valve to OFF.
4.
Remove gas supply line from heater.
B. GAUGE INSTALLATION
1.
Connect the following materials together in the order
as given to the inlet of the regulator. See Fig. 2.
-- Nipple to inlet of regulator on heater.
-- Tee to nipple.
-- Bushing to tee.
-- Gas line to tee.
2.
Connect a low pressure gauge to bushing to tee.
3.
Using the appropriate allen wrench, remove the
pressure tap plug located at the regulator on the
heater. See Fig. 2.
4.
Attach a low pressure gauge at this location. See Fig. 2.
5.
Open fuel supply valve to heater.
C. READING PRESSURES
1.
Light the pilot and start the heater.
2.
With heater operating, the pressure gauges should
read the pressures specified on the dataplate or in
the specification section of this owner’s manual.
3.
Do the pressure readings at the inlet and burner
manifold of the heater agree with that given on the
dataplate? If so, no further checking or adjustment is
required. Proceed to Section D.
4.
If inlet or burner manifold pressures do not agree with
that specified on the dataplate, then check the
following:
-- Low gas pressure to heater from main gas supply.
-- Blockage in gas supply line.
-- Improper sizing of gas supply line to heater.
Contact your natural gas supplier to resize if
necessary.
-- Regulator on heater is out of adjustment (replace
if necessary).
D. COMPLETION
1.
Once the proper pressures have been confirmed,
close fuel supply valves.
2.
Allow heater to burn off fuel remaining in gas supply
line.
3.
Remove gauges, nipples and tee.
4.
Reconnect gas line to inlet of heater and install
pressure tap plug.
5.
Tighten all connections securely and check for gas
leaks.
11
Service Instructions
GAS PRESSURE CHECKS
WARNING
■
Do not disassemble the pilot safety control valve.
■
Do not attempt to replace any components of the pilot
safety control valve.
■
The pilot safety control must be replaced if any
physical damage occurs to it.
■
Failure to follow this warning will result in fire or
explosions, leading to injury or death, and building
damage.
