Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 28)

28 75D2523
Figure 37 - External Regulator with Vent Pointing
Down (Propane/LP Only)
FIREPLACE INSTALLATION
CHECK GAS TYPE
Use proper gas type for the fireplace you are installing. If you have conflicting gas type, do not install fireplace. See dealer
where you purchased the fireplace for proper fireplace according to your gas type.
INSTALLING GAS PIPING TO FIREPLACE LOCATION
INSTALLATION ITEMS NEEDED
Before installing fireplace and burner system, make sure you
have the items listed below.
• External regulator (supplied by installer) • Tee joint
• Piping (check local codes)
• Pipe wrench
• Sealant (resistant to propane/LP gas)
• Test gauge connection*
• Sediment trap (optional but recommended)
• approved flexible gas line with gas connector (if allowed
by local codes — not provided)
* A CSA design-certified equipment shutoff valve with 1 /
8
"
NPT tap is an acceptable alternative to test gauge connec-
tion. Purchase the CSA design-certified equipment shutoff
valve from your dealer.
External
Regulator
100 gal. (min)
Propane/LP
Supply Tank
Vent
Pointing
Down
When using copper or flex connectors use only fittings
approved for gas connections. The gas control inlet is
3 /
8
" NPT.
For propane/LP connections only, the installer must supply an external regulator. The external regulator will reduce incoming
gas pressure. You must reduce incoming gas pressure to between 11 and 13 inches of water. If you do not reduce incoming
gas pressure, burner system regulator damage could occur. Install external regulator with the vent pointing down as shown
in Figure 37. Pointing the vent down protects it from freezing rain or sleet.
WARNING
A qualified installer or service
person must connect appliance to
gas supply. Follow all local codes.
CAUTION
For propane/LP units, never connect
fireplace directly to the propane/LP
supply. This burner system requires
an external regulator (not supplied).
Install the external regulator between
the burner system and propane/
LP supply.
CAUTION
Use only 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.
WARNING
External regulators may be necessary
for natural gas. One- or two-pound
systems will damage this appliance
and may cause fire hazard.