Monessen Hearth PL20 User Manual

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14
90D0093
Parlor Vent Free Fireplace
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.
CHECk GAS PRESSURE
MILLIVOLT CONTROL
 
Figure 14
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 pres-
sure 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.
FP2511
millivolt test point
Test Port 
'A'
FP511
Figure 14 - 
Pressure Test Point Location - Millivolt Valve