13
AVFLST Vent Free Fireplace
Monessen • AVFLST42 Installation Instructions • 4118-900 Rev. B • 05/2020
FIREPLACE INSTALLATION
CONNECT THE GAS
NOTICE:
A qualified gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
Note: Gas line may be installed on the left or right side of
the appliance.
WARNING!
Use new black iron or steel pipe. Internally
tinned copper or copper tubing can be used
per National Fuel Code, section 2.6.3, providing
gas meets hydrogen sulfide limits, and where
permitted by local codes. Gas piping system
must be sized to provide minimum inlet
pressure (Listed on Data Plate) at the maximum
flow rate (BTU/hr). Undue pressure loss will
occur if the pipe is too small.
A manual shutoff valve must be installed
upstream of the appliance. Union tee and
plugged
1
⁄
8
" NPT pressure tapping point should
be installed upstream of the appliance. Figure
10
A sediment trap should be installed upstream
to prevent moisture and contaminants from
passing through the pipe to appliance controls
and burners. Failure to do so could prevent the
appliance from operating reliably. Figure 10
IMPORTANT:
Loosen the pipe adapter on the flex tube
before installing to the system piping.
Always use an external regulator for all propane/LPG heat-
ers only, to reduce the supply tank pressure to a maximum
of 13" w.c. This is in addition to the internal regulator in the
heater valve.
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.
W
ARNING!
CHECK GAS TYPE:
The gas supply must be the
same as stated on the heater’s rating plate. If the
gas supply is different, DO NOT INSTALL THE
HEATER. Contact your dealer for the correct
model.
WARNING!
Connecting directly to an unregulated
propane/LP tank can cause an explosion.
FP2447
gas connection
3” Min.
To Fireplace
Pipe
Coupling
Stainless
Flexible Tube
Pipe
Locations Pressure Tapping
Point Installation
Manual Shutoff
Valve
Gas Supply Inlet
Tee Joint
Pipe Nipple
Cap
Sediment
Trap
WARNING!
DO NOT USE OPEN FLAME TO CHECK FOR
GAS LEAKS.
WARNING!
This appliance is equipped for either natural or propane
gas. Field conversion is not permitted.
Figure 10.
Gas Connection
►
