Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 29)

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3"
Minim
um
FIREPLACE INSTALLATION
A listed 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. See Figure 38.
IMPORTANT: Install main gas valve (equipment shutoff valve) in an accessible location. The main gas valve is
for turning on or shutting off the gas to the fireplace.
Check your building codes for any special requirements for locating
equipment shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male threads. This will prevent
excess sealant from going into pipe. Excess sealant in pipe could
result in clogged burner system valves.
Figure 38 - Gas Connection
Tee Joint
Pipe Nipple
Cap
Approved Flexible
Gas Line
UL/CSA Design-Certified Equipment
Shutoff Valve with 1 /
8
" NPT Tap*
Sediment Trap/Drip Leg
Natural Gas
From Gas Meter
(4" W.C. to 10.5" W.C. Pressure)
Propane/LP
From External Regulator
(11" W.C. to 13" W.C. Pressure)
NOTE : The gas line connection may be made using 1 /
2
" rigid tubing or an approved flex connector. Since
some municipalities have additional local codes it is always best to consult your local authorities and
the current edition of the National Fuel Gas Code ANSI.Z223.1, NFPA54. In Canada CAN/CGA-B149 (1 or
2) Installation Code.
We recommend that you install a sediment trap/drip leg in supply line as shown in Figure 38. Locate sediment trap/drip
leg where it is within reach for cleaning. Install in piping system between fuel supply and burner system. Locate sediment
trap/drip leg where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them
from going into the burner system gas controls. If sediment trap/drip leg is not installed or is installed wrong, burner system
may not run properly.
WARNING
Only persons licensed to work with
gas piping may make the necessary
gas connections to this appliance.
CAUTION
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.
See Figure 38.
CAUTION
Use pipe joint sealant that is
resistant to liquid petroleum
(LP) gas.