Checking Gas Pressure; Manual Control; Thermostat Control; Millivolt Control - Monessen Hearth DBX24C Installation And Operating Instructions Manual

DFX & DBX Series Vent Free Fireplaces
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.
Do not use open flame to check for gas
leaks.

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.
NPT Test Plug
Figure 12 -
Pressure Test Point Location
- Manual Control
FP2499

THERMOSTAT CONTROL

Figure 13
manual valve
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.
14
Connecting directly to an unregulated
propane/LP tank can cause an
explosion.
Figure 13 -
Alternate Test Point Location for
Thermostat control Units
FP499
Test Port
'A'
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
FP2511
to reseal. Do not over torque. Check for gas leaks.
millivolt test point
FIREPLACE INSTALLATION
Test Points
FP510
FP2510
thermostat control
FP511
33D4047