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LENNOX HEARTH PRODUCTS • MONTEBELLO
These electronic appliances are remotely
controlled and feature an electronic
intermittent pilot ignition system or standing
pilot. External electrical power is required to
operate these units.
These electronic models come standard
with a remotely-modulated gas valve; flame
appearance and heat output cannot be
controlled at the gas valve. The BTU Input for
these appliances is shown in Table 1.
Model No.
Natural Gas
MDLX40IN
32,000 to 50,000
MDLX45IN
38,500 to 60,000
Propane Gas
MDLX40IP
32,000 to 50,000
MDLX45IP
38,500 to 60,000
Table 1: Input (BTU/HrR)
Gas Pressure—All Models
Appliance inlet and manifold gas pressure
requirements are listed in Tables 2 and 3.
Fuel #
Minimum
5.5 in. WC
Natural
(1.37 kPa)
Gas
11.0 in. WC
Propane
(2.74 kPa)
Table 2: Inlet Gas Supply Pressure
Fuel #
Low
Natural
1.6 in. WC
Gas
(.4 kPa)
6.3 in. WC
Propane
(1.57 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).
Propane tanks are at pressures that will
cause damage to valve components. Verify
that the tanks have step-down regulators to
reduce the pressure to safe levels.
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).
4
®
Orifice Sizes—Sea Level To High Altitude
(All Models)
These appliances are tested and approved
for installation at elevations of 0–4500 feet
(0–1372 meters) above sea level, using the
standard burner orifice sizes (marked with
an asterisk (*) in Table 4). For elevations
above 4500 feet, contact your gas supplier or
qualified service technician.
Deration—At higher elevations, the amount
of BTU fuel value delivered must be reduced
Input (BTU/Hr)
by either:
• using gas that has been derated by the
gas company; or
• 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/CSA-B149.1 codes—latest edition.
Install the appliance according to the
regulations of the local authorities having
jurisdiction and, in the USA, the National Fuel
Gas Code NFPA 54 / ANSI Z223.1—latest
edition or , in Canada, the CAN/CSA-B149.1-
latest edition.
NOTE: Flame appearance will diminish 4%
Maximum
per thousand feet of altitude.
10.5 in. WC
(2.61 kPa)
Model
13.0 in. WC
MDLX40
(3.23 kPa)
MDLX45
High
3.5 in. WC
(.87 kPa)
Table 4: Burner Orifice Sizes
Elevation 0–4500 ft ( 0–1372 m)
10.0 in. WC
(2.49 kPa)
(From DFC Wire
Main Gas Inlet
3/8 in. NPT
Figure 1: SIT Proflame Valve
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
Nat.Gas
Propane
drill size (inches)
drill size (inches)
0.1405 in.
0.086 in.
(#28)*
(#44)*
• H2286
• H2287
0.154 in
0.093 in.
(#23)*
(#42)*
• H8808
• H4816
* Standard size installed at factory
• Part /Cat. Number
Green Wire
(From DFC Wire
Harness)
Manifold (Out)
Test Port
Inlet (In) Test Port
Wire
Harness)
Gas Valve Diagram
The SIT Proflame gas valve is shown in
Figure 1.
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 inches (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:
• A hard wired carbon monoxide detector
with an alarm and battery back-up must
be installed on the floor level where the
gas fireplace is installed. The carbon
monoxide detector must comply with
NFPA 720, be ANSI/UL 2034 listed and be
ISA certified.
• A metal or plastic identification plate must
be permanently mounted to the exterior
of the building at a minimum height of
eight (8) feet above grade and be directly
in line with the horizontal termination.
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.
Connect GTMS
Wire Harness
Pressure
Regulator
Tower
Yellow Ground Wire
(From DFC Wire
Harness)
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