Monessen Hearth DFX24C - Manual (Page 14)

14 33D4047
DFX & DBX Series Vent Free Fireplaces FIREPLACE INSTALLATION
When tightening 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.
Open control access door at bottom front of unit to find valve and regulator referred to below.
W
ARNING
Do not use open flame to check for gas
leaks.
W
ARNING
Connecting directly to an unregulated
propane/LP tank can cause an
explosion.
MANUAL CONTROL
Figure 12
The pressure regulator is preset and locked to discourage
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.
FP2499
manual valve
NPT Test Plug
FP499
Figure 12 -
Pressure Test Point Location
- Manual Control
FP2510
thermostat control
Test Points
FP510
Figure 13 -
Alternate Test Point Location for
Thermostat control Units
THERMOSTAT CONTROL
Figure 13
Turn captured screw counter clockwise two or three turns
and then place tubing to pressure gauge over test point
(Use test point closest to control knob). After taking pres-
sure reading, be sure and turn captured screw clockwise
firmly to reseal. Do not over torque. Check for gas leaks.
MILLIVOLT CONTROL
Figure 14
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
FP2511
millivolt test point
Test Port
'A'
FP511
Figure 14 -
Pressure Test Point Location - Millivolt Valve
Turn captured screw counter clockwise two or three turns
and then place tubing to pressure gauge over test point.
(Use test point “A” closest to gas inlet). After taking pressure
reading, be sure and turn captured screw clockwise firmly
to reseal. Do not over torque. Check for gas leaks.