Setting The Manifold Gas Pressure - Napoleon WSX-EN Series Installation And Operating Instructions Manual

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 36G54 TWO STAGE GAS VALVE
1. Turn off the gas and electrical supply before proceeding.
2. Back outlet pressure test screw (outlet pressure boss, see Fig.31) counterclockwise out one 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
W1 on the integrated control board. Do not energize the HI solenoid.
4. Remove regulator adjustment cover screw from the low outlet pressure regulator adjust tower (Fig.31) and
turn the plastic regulator adjustment screw clockwise to increase manifold pressure or counterclockwise
to reduce manifold pressure. Always adjust regulator according to original equipment manufacturer's
specifi cations listed on the appliance rating plate. Replace regulator cover screw.
5. Energize main solenoid as well as the HI terminal by connecting R/W1 and W1/W2 on the integrated
furnace control. Remove regulator cover screw from the high outlet pressure regulator adjust tower
(Fig.31) and turn the plastic regulator adjustment screw clockwise to increase manifold pressure or
counterclockwise to reduce manifold pressure. Manifold pressure should be set to 1.8" w.c low fi re, 3.5"
w.c high fi re for natural gas, 5.0" w.c low fi re, 10.0" w.c. high fi re 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.
6. Turn off the gas and electrical supply to the furnace.
ALL REGULATOR ADJUSTMENTS MUST BE DONE BY A TRAINED, QUALIFIED TECHNICIAN.
IMPROPER MODIFICATIONS OR ADJUSTMENTS CAN RESULT IN FIRE OR EXPLOSION
CAUSING PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR LOSS OF LIFE.
7. 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).
8. Turn on the gas supply and electrical power to the furnace.
9. Turn on system power and energize valve.
10. Using a leak detection solution or soap suds, check for leaks at pressure boss screw. Bubbles forming
indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY!
WARNING
! !
H3.21
H18.5.4
W415-2845 / B / 11.10.20
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IOM