Monessen Hearth NB24 - Manual (Page 20)

20 81D0107
CHECKING GAS PRESSURE
The heater gas inlet connection is a 3 /
8
" NPT at the valve. On all
control type units, the inlet connection is on the right side of unit.
To connect from the opposite side, route the pipe around the back
portion of the unit.
When tightening up the joint to the valve, hold the valve securely
to prevent movement.
MILLIVOLT VALVE CONTROL (Figure 16)
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point (Use test point “OUT” closest to control knob).
After taking pressure reading, be sure and turn captured
screw clockwise firmly to re-seal. Do not over torque.
Check for gas leaks.
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after com-
pleting connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
W
ARNING
C o n n e c t i n g d i r e c t l y t o a n
unregulated propane/LPG tank
can cause an explosion.
Figure 16 - Pressure Test Point Location
Millivolt Control
Test Port “OUT”