MHSC DIRECT VENT MLDV500 Installation And Operating Instructions Manual page 29

FIREPLACE INSTALLATION
Only persons licensed to work with gas
piping may make the necessary gas
connections to this appliance.
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.
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.
Approved Flexible
Gas Line
Sediment Trap/Drip Leg
Figure 42 -
Gas Connection
75D0004
CSA Design-Certified Equipment
Shutoff Valve with 1/8" NPT Tap*
Tee Joint
Pipe Nipple
Cap
FP1978
gas connection
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
Use pipe joint sealant that is resistant to liquid
petroleum (LP) gas.
(4.5" w.c. to 10.5" w.c. Pressure)
From External Regulator
(11" w.c. to 13" w.c. Pressure)
3 "
M i
n i m
u m
MLDV Series Gas Fireplace
Natural Gas
From Gas Meter
Propane/LP
9