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LENNOX HEARTH PRODUCTS • MONTEBELLO
Gas Pressure—All Models
Tables 2 and 3 show the appliance inlet and
manifold gas pressure requirements.
Minimum
5.5 in. WC
(1.37 kPa)
Table 2: Inlet Gas Supply Pressure
Low
1.6 in. WC
(.40 kPa)
Table 3: Manifold Gas Supply Pressure
Test gauge connections are provided on the
front of the gas control valve; identified IN
for the inlet and OUT for the manifold side
(see Figure 1).
The appliance and its appliance main gas
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 psi (3.5 kPa).
The appliance must be isolated from
the gas supply piping system by closing
its equipment shutoff valve during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than 1/2 psi (3.5 kPa).
Gas Valve Diagram
See Figure 1 for gas valve diagram.
(From DFC Wire
Manifold (Out)
Test Port
Inlet (In) Test Port
Wire
(From DFC Wire
Harness)
Main Gas Inlet
3/8 in. NPT
Figure 1: SIT Electronic Gas Valve
4
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
®
PURGE CYCLE
This is a power vented fireplace
that requires household electrical
power to operate. It will not operate
during a power failure. When the
Maximum
fireplace is turned off, the exhaust
blower will continue to operate for
10.5 in. WC
approximately fifteen (15) seconds
(2.62 kPa)
after shutdown to expel the exhaust
gases from the venting system.
High
Orifice Sizes—Sea Level To High Altitude
3.5 in. WC
These appliances are tested and approved
(.87 kPa)
for installation at elevations of 0–4500 ft
(0–1370 m) above sea level, using the
standard burner orifice sizes (marked with an
"*" in Table 4). For elevations above 4500 ft,
contact your gas supplier or qualified service
technician.
Deration—At higher elevations, the amount
of BTU fuel value delivered must be reduced
by either:
• Using gas that has been derated by the
gas company.
• Changing the burner orifice to a smaller
size as regulated by the local Authorities
Having Jurisdiction and by the (USA)
National Fuel Gas Code NFPA 54/ANSI
Z223.1—latest edition, or in Canada, the
CAN/CGA-B149.1 code—latest edition.
Install the appliance according to the
regulations of the local authorities having
jurisdiction, and the (USA) National Fuel Gas
Code NFPA 54 / ANSI Z223.1—latest edition,
or (Canada) CAN/CSA-B149.1—latest edition.
NOTE: Flame appearance will diminish 4%
per one thousand feet of altitude.
Green Wire
Harness)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
MDLX40IN-PV
MDLX45IN-PV
Table 4: Burner Orifice Size
Elevation 0–4500 ft (0–1370 m)
In Canada - CAN/CGA-2.17-M91 (R2009)
(high altitude):
THE CONVERSION SHALL BE CARRIED OUT
BY A MANUFACTURER'S AUTHORIZED
REPRESENTATIVE, IN ACCORDANCE
WITH THE REQUIREMENTS OF THE
MANUFACTURER, PROVINCIAL OR
TERRITORIAL AUTHORITIES HAVING
JURISDICTION AND IN ACCORDANCE
WITH THE REQUIREMENTS OF THE
CAN/CGA-B149.1 OR CAN/CGA-B149.2
INSTALLATION CODES.
REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS
These fireplaces are approved for installation
in the US state of Massachusetts if the
following additional requirements are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations
248 C.M.R.
• Installation and repair must be done by
a plumber or gas fitter licensed in the
Commonwealth of Massachusetts.
• The flexible gas line connector used shall
not exceed 36 in. (92 centimeters) in
length.
• The individual manual shut-off must be a
T-handle type valve.
Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts,
horizontal terminations installed less than
seven (7) feet above the finished grade
must comply with the following additional
requirements:
Connect GTMS
• A hard wired carbon monoxide detector
Wire Harness
with an alarm and battery back-up must
be installed on the floor level where the
gas fireplace is installed. The carbon
Pressure
monoxide detector must comply with
Regulator
NFPA 720, be ANSI/UL 2034 listed and be
Tower
ISA certified.
• A metal or plastic identification plate must
be permanently mounted to the exterior
of the building at a minimum height of
Yellow Ground Wire
eight (8) feet above grade and be directly
(From DFC Wire
in line with the horizontal termination.
Harness)
The sign must read, in print size no less
than one-half (1/2) inch in size, GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS.
Model
Orifice Size / Catalog Number
0.125 in. (1/8 in.) * H7924 •
0.136 in. (#29) * H8141 •
* Standard size installed at factory
• Part /Cat. Number
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