Monessen Hearth CL)NVC/PVC User Manual

38

Make sure the gas valve knob is in the “OFF” position. Wait at least five (5) minutes before start-
ing maintenance. Fireplace must be cold before starting maintenance. 

A qualified agency should examine the venting system annually. 

Clean the tempered glass periodically. Condensation will some-
times form on the glass during a cold startup. This is normal for all 
gas fireplaces. This condensation often attracts dust and lint to the 
surface of the glass. The initial paint curing of the appliance can also leave a slight film on the 
glass. 
Your should clean the glass after the first two weeks of use. After that, you should clean the 
glass no more than two or three times a season. Use a mild glass cleaner to clean the door. Do 
not use abrasive cleaners. They will damage the glass surface. 

1.  Carefully remove log set, and embers (rock wool) from 

combustion chamber. 

2.  Vacuum burner compartment thoroughly. 
3.  Vacuum or brush with soft brush any dust off logs. 
4.  Remove any lint from main burner and pilot. 
5.  Carefully replace log set, and embers in their correct 

positions. Refer to Pages 34 through 36.  

6.  Replace door (if it has been removed).
7.  Relight pilot. Refer to Page 37.
8.  Turn on main burner. 

LG645
DV6000 log flames

LG645

Thermopile 

Thermocouple 

FP2312
pilot flame

FP2312

Visually check pilot and burner flames periodically. Refer 
to Figure 53 for typical burner flame. Refer to Figure 54 for 
typical pilot flame.