Monessen Hearth DIRECT VENT MLDV500 - Manual (Page 28)

8 75D0004
MLDV Series Gas Fireplace 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 for your gas type or
conversion kit.
INSTALLING GAS PIPING TO FIREPLACE / BURNER SYSTEM LOCATION
INSTALLATION ITEMS NEEDED
Before installing fireplace and burner system, make sure you have the items listed below.
• External regulator (supplied by installer) • Piping (check local codes) • Sealant (resistant to pro-
pane/LP gas) • Equipment shutoff valve* • Test gauge connection*
• Sediment trap (recommended)
• Tee joint • Pipe wrench
• 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
connection. Purchase the CSA design-certified equipment shutoff valve from your dealer.
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 41. Pointing the vent down protects it from freezing rain or sleet.
External
Regulator
100 gallon (min)
Propane/LP Supply
Tank
Vent Pointing
Down
When using copper of flex connectors use only fittings
approved for gas connections. The gas control inlet is
3/8" NPT.
W
ARNING
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.
FP1977
external regulator
Figure 41 -
External Regulator with Vent Pointing Down
(Propane/LP Only)
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.