Check Gas Pressure; Manual Control; Millivolt Control - Monessen Hearth PH18 Installation And Operating Instructions Manual

PH Gas Logs

CHECK GAS PRESSURE

The heater gas inlet connection is a 3/8" NPT at the valve.
All units have the inlet connection on the right side, when
you face the unit. To connect from the opposite side, route
the pipe under the rear portion of the unit.
When tightening up the joint to the valve, hold the valve
securely to prevent movement.
Test all gas joints from the gas meter to the heater valve
for leaks using a gas analyzer or soap and water solution
after completing connection. DO NOT USE AN OPEN
FLAME.
Check the gas pressure with the appliance burning and
the control set to HIGH.

MANUAL CONTROL

Figure 14
The pressure regulator is preset and locked to dis-
courage tampering. If the pressure is not as specified,
replace the regulator with the correct part from the parts
list in this manual.
Remove 1/8" NPT plug, located on side of regulator body.
Install fitting and tubing to pressure gauge. After taking
pressure reading, reinstall test plug. Check for gas leaks.
NPT Test Plug
Figure 14 -
Manual Control Pressure
Test Point Location
FP2499
manual valve
Monessen • PH18/24 Installation/Owner's Manual • 65D2035 • Rev G • 03/2020
14

MILLIVOLT CONTROL

Figure 15
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or thre turns
and then place tubing to pressure gauge over test point
(Use test point "OUT" closest to control knob). After tak-
ing pressure reading, be sure and turn captured screw
clockwise firmly to re-seal. Do not over torque. Check for
gas leaks.
Figure 15 -
Millivolt Control Pressure
Test Point Location
FP2499
Test Port "Out"
FP2372
millivolt valve
INSTALLATION
FP2372