Setting The Manifold Gas Pressure - Napoleon NBM030S2A Installation And Operating Instructions Manual

7. Using a leak detection solution, check for leaks at pressure boss screw. Bubbles forming indicate a leak.
SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY!
8. Turn gas back on and test inlet pressure boss with leak detector.
9. If working on a natural gas system, contact the gas utility. They may insist on any service regulator
adjustments being made by their own staff.
If problems were encountered with obtaining enough pressure, fi rst examine the gas piping system to ensure
that it is correctly sized. Pipe sizing is specifi ed in CAN/CSA-B-149.1 & 2, and in NFPA 54 / ANSI Z223.1. Be
sure to check for restrictions, partially closed valves, etc.
In some circumstances, high inlet pressure can be remedied with the use of an in line appliance regulator. If
an in line appliance regulator is used, ensure that it has the capacity to adequately handle the gas volume
required by the furnace and any other appliances receiving gas from the header serving the furnace.
FIGURE 28 - WHITE RODGERS 36J24-214 GAS VALVE
Outlet Pressure Boss
Inlet Pressure
Boss (opt.)
Terminals

13.5 SETTING THE MANIFOLD GAS PRESSURE

When the installation is completed to the "Start-up & Setup" stage, test the gas manifold pressure by following
these steps:
WHITE-RODGERS 36J24-214 SINGLE STAGE GAS VALVE
1. Turn off the gas and electrical supply before proceeding.
2. Back outlet pressure test screw (outlet pressure boss, see fi g. 28 & 29) counterclockwise out one more
turn maximum, with a 3/32" Allen wrench. Attach a hose and calibrated U-tube or digital manometer to the
outlet pressure boss. Hose should overlap boss 3/8". The manometer must have a scale range of at least
0" to 15" of water column.
3. Turn on the gas supply and electrical power to the furnace and energize main solenoid by connecting R to
W on the integrated control board.
4. Remove regulator adjust cover screw from the outlet pressure regulator adjust tower (fi g.28) and turn
the plastic regulator adjustment screw clockwise to increase manifold pressure or counterclockwise to
reduce manifold pressure. Manifold pressure should be set to 3.5" w.c for natural gas, 10.5" w.c. for LP
gas. Always adjust regulator according to original equipment manufacturer's specifi cations listed on the
appliance rating plate.
When the correct pressure has been established, securely replace the regulator cover screw.
5. Turn off the gas and electrical supply to the furnace.
6. Remove the manometer hose from the outlet pressure tap boss, and tighten the outlet pressure tap screw
using the 3/32" Allen wrench. (Clockwise, 7 in-lb minimum).
Regulator Vent
Regulator
Adjust
On/Off Switch
H18.4.1
FIGURE 29 - VALVE PRESSURE CHECK KIT
39
IOM
W415-1117 / A / 03.11.14