Monessen Hearth DIRECT VENT MLDV500 - Manual (Page 29)

75D0004 9
MLDV Series Gas Fireplace
3" Minimum
FP1978
gas connection
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. Figure 42
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 seal-
ant in pipe could result in clogged burner system valves
We recommend that you install a sediment trap/drip leg
in supply line as shown in Figure 42. 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 collects
moisture and contaminants and 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.
Figure 42 -
Gas Connection
Cap
Approved Flexible
Gas Line
CSA Design-Certified Equipment
Shutoff Valve with 1/8" NPT Tap*
Sediment Trap/Drip Leg
Natural Gas
From Gas Meter
(4.5" 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/" 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.Z3.1, NFPA54. In Canada CSA-B149 (1
or ) Installation Code.
Tee Joint
Pipe Nipple
CAUTION
Use pipe joint sealant that is resistant to liquid
petroleum (LP) gas.
W
ARNING
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.
Figure 40