VANTAGE
®
NP F
UEL
C
ONVERSION
I
NSTRUCTIONS
8
FIGURE 7: Burner, Side View (internal assembly)
Step 5.5 Inlet Gas Pressure Checks
The gas inlet pressure to the heater must be checked
as follows:
1. Turn off electrical supply to heater.
2. Turn off gas supply to heater.
3. Remove the plug at the valve inlet and install a
test tap and hose. Connect the hose to a liquid
filled manometer.
See Page 9, Figure 8
.
4. Turn on gas supply to heater.
5. The manometer should read a maximum gas
pressure of 14.0" wc for Natural or LP gas.
6. Turn on electrical supply to heater.
7. With heater in operation, manometer should
read a minimum inlet pressure of 4.5" wc for
Natural gas or 11.0" wc for LP gas.
8. If the required maximum and minimum
pressures are not obtained, the main gas
supply pressure to the heater must be adjusted
as necessary.
9. Turn off main gas supply to heater.
10.Turn off electrical supply to heater.
11. Remove manometer and insert pipe plug into
valve.
12.Turn on main gas supply to heater.
13.Leak test plug in tapping using soap solution.
14.Turn on electrical supply to heater.
Step 5.6 Adjust Regulator
1. Using a 3/16" hex key, remove the plug at the
valve outlet and install a test tap and hose.
Connect the hose to a liquid filled manometer.
See Page 9, Figure 8
.
NOTE: Insure differential box pressure is .75"
(hot) per Section 17 of the VANTAGE
®
NP
Installation, Operation and Service Manual (P/N
152101NA).
See Page 10, Figure 9
.
2. Turn on gas and power, turn up thermostat.
3. When unit comes on; adjust the regulator by
turning the adjusting screw to set the pressure
to:
Natural: 3.5" wc
Propane: 10.5" wc
4. Turn off power and gas.
5. Remove test tap and replace plug at the valve
outlet. Replace O ring and cap screw.
Pressure Switch
Gas Valve
Transformer
Tube Gasket
