MartinLogan VENT-FREE FIREPLACE SYSTEMS 33ISDG Benutzerhandbuch

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CHECKING GAS PRESSURE
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after com-
pleting 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 on either side of unit to find valve and regulator referred to below. See Figure 17, page 16. 
MILLIVOLT CONTROL 
(Figure 19)
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 pressure gauge over test 
point (Use test point “OUT” closest to control knob). 
After taking pressure reading, be sure and turn captured 
screw clockwise firmly to re-seal. Do not over torque. 
Check for gas leaks.
Figure 19 - Pressure Test Point Location
Milli-Volt Control 
Test Port “OUT”
Connecting directly to an 
unregulated propane/LPG 
tank can cause an explosion.
W
ARNING
The stainless flex line is on the right side facing the fireplace and can 
connect to either a 
3
/
8
 NPT female or 
1
/
2
 NPT male pipe. To connect from 
the opposite side, route the pipe under the rear portion of the unit.