Installing The Gasline; Vent Installation; Installation Requirements; Vent Terminations - Montigo HW38DF Operation Manual

Installing The Gas Line
The gas line must be installed before finishing the HW38DF Fireplace.
Natural Gas requires a minimum inlet gas supply pressure of 5.5" W.C.
& a manifold pressure of 3.5" W.C. Propane Gas requires a minimum
inlet gas supply pressure of 11" W.C. & a manifold pressure of 10" W.C.
Provision must also be made for a 1/8" N.P.T. plugged tapping and be
accessible for test gauge connection immediately upstream of the gas
supply controls to the appliance. The fireplace gas connection and the
main operating gas valve is located behind the removable trim at the
bottom of the unit and need only be attached to the gas line with an
approved fitting, as required by the applicable installation codes.
To access the fireplace gas connection the main burner must be
removed as shown below in figure 5b.
• Only use gas shut-off valves approved for use by the state, province,
region, or governing body, in which the appliance is being installed, or
as required by the applicable installation codes.
• Flexible gas connectors must not exceed 3 feet in length, unless it is
allowable within applicable installation codes.
Gasline Acces
0.875 dia.
2
7
to center
Figure 5a. Gas line access.
Burner Tray Gasket
Figure 5b. Gas line access.
The appliance and its individual shut-off valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply piping system by
closing its individual manual shut-off valve during any pressure testing
of the gas supply piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Note: After gas line is connected, each appliance connection,
valve and valve train must be checked while under normal
operating pressure with either a liquid solution, or leak
detection device, to locate any source of leak. Tighten any
areas where bubbling appears or leak is detected until
bubbling stops completely or leak is no longer detected.
DO NOT use a flame of any kind to test for leaks.
Part No. XG0190 - 071409
Installation
This section covers the installation of direct venting and terminations.

Installation Requirements

HW38DF fireplaces is certified for use with Montigo Standard Series (4"/7"
■
TOP ONLY) or (5" / 8") venting components.
■ Minimum clearance to combustible construction around the vent pipe is 1"
on all sides, except on horizontal venting where the top of the pipe must
have a clearance of at least 2".
■ Use only certified Montigo vent components. (Use of other parts will void
the Montigo warranty, and may impede the operation of the fireplace.)
■ All joints must be secured with a minimum of two screws per joint
■ Vent terminations must not be recessed in walls or siding
■ Horizontal runs must be supported by a minimum of two supports per hori-
zontal run. A minimum of one screw on each side of support is also required
■ Flex vent sections may be stretched up to 50% of their total length (eg. a
24" section may be stretched to 36")
■ Flex vent sections over 6 feet must fall within the limits set by the venting
graph and must have a minimum vertical rise of 3 inches per foot of flex.
■ Solid vent sections may be cut less than half way from the female end
■ Venting components can be used in any combination of solid/rigid pipe or
flex pipe and in any orientation (Male connectors can face in any direction)

Vent Terminations

Selecting A Termination Location
Choosing your vent termination location will help to determine whether
you need to use a top vent or rear vent fireplace. Figure 6a, below, shows
typical fireplace locations and the venting options they provide.
For a more detailed diagram of allowed termination locations, see Ap-
pendix A.
Figure 6a. Fireplace locations and vent terminations.
Vent terminations can be very hot. If the termination is less
■
than 7 feet above a public walkway, it should be fitted with a
certified Montigo Heat Guard. (Part no. MTKOG/PTKOG).
Do not obstruct, or attempt to conceal, the vent termination.
■
These actions will affect the operation of the fireplace,
and may be hazardous.
In heavy snow areas, take extra care to prevent snow
■
buildup from obstructing the vent termination.
HWDF-Series Gas Fireplace

Vent Installation

Cautions:
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