General Information; Btu Input; Gas Pressure Requirements; Orifice Sizes - Lennox MDLX40IN-PV Care And Operation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO

GENERAL INFORMATION

The fireplace models covered in this
manual are direct-vent, sealed combustion
gas fireplaces designed for residential,
commercial, and manufactured home
applications. Direct-vent appliances operate
with the combustion chamber completely
isolated from the indoor environment.
All air for combustion is brought in from
the outside and exhaust gases are vented
through the same direct-vent, co-axial
(intake/exhaust) vent system.
These electronic appliances are designed to
operate on natural gas and have an electronic
intermittent pilot ignition system. External
120 Volt AC electrical power is is required to
operate these units.
These appliances comply with National
Safety Standards and are tested
and listed by Intertek (Report No.
100513650PRT-001) to ANSI Z21.50b-2009
(in Canada, CGA 2.22b-2009), and CAN/
CGA-2.17-M91 (R2009) in both the USA and
Canada, as vented gas fireplaces.
The Installation must conform to local
codes or, in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1/
NFPA 54—latest edition, or the Natural Gas
Installation Code, CAN/CGA B149.1—latest
edition. The appliance, when installed, must
be electrically grounded in accordance with
local codes or, in the absence of local codes,
with the National Electrical Code, ANSI/
NFPA 70—latest edition, or the Canadian
Electrical Code, CSA C22.1—latest edition.

BTU Input

The BTU Input for these appliances is shown
in Table 1.
Model No. Input (BTU/Hr)
MDLX40IN-PV 26,500–42,000
MDLX45IN-PV 35,000–48,000
Table 1: Input (BTU/HR), Natural Gas
DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • CARE AND OPERATION INSTRUCTIONS
®

Gas Pressure Requirements

Tables 2 and 3 show the appliances' 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 2 on Page 9). The control valve has a
3/8 in. (10 mm) NPT thread inlet and outlet
side of the valve.
These appliances must be isolated
from the gas supply piping system (by
closing their individual manual shutoff
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).
These appliances and their individual
shutoff valves must be disconnected
from the gas supply piping system
during any pressure testing of that
system at pressures greater than
1/2 psig (3.5 kPa).
Orifice Sizes—Sea Level to High Altitude
These appliances are tested and approved
for installations at elevations of 0–4500 ft
(0–1372 m) above sea level using the
standard burner orifice sizes (marked with an
asterisk [*] in Table 4).
Model Orifice Size / Catalog No.
MDLX40IN-PV 0.125in.(1/8in.)*/H7924•
MDLX45IN-PV 0.136 in. (#29) * / H8141 •
* Standard size installed at factory
Table 4: Burner Orifice Size
Elevation 0–4500 ft (0–1372 m)
At the time of installation, it must be
determined if the appliance needs to be
derated. Contact your local gas supplier for
deration requirements for your area.
Install the appliance according to the
regulations of the local Authorities Having
Jurisdiction and the National Fuel Gas Code
(US) NFPA 54 / ANSI Z223.1—latest edition,
or (Canada) CAN/CGA-B149.1—latest edition.
Maximum
In Canada, CAN/CGA-2.17-M91 (R2009)
(high altitude): THE CONVERSION SHALL
10.5 in. WC
BE CARRIED OUT BY A MANUFACTURER'S
(2.62 kPa)
AUTHORIZED REPRESENTATIVE, IN
ACCORDANCE WITH THE REQUIREMENTS
OF THE MANUFACTURER, PROVINCIAL
OR TERRITORIAL AUTHORITIES HAVING
High
JURISDICTION AND IN ACCORDANCE
WITH THE REQUIREMENTS OF THE
3.5 in. WC
CAN/CGA-B149.1 OR CAN/CGA-B149.2
(.87 kPa)
INSTALLATION CODES.
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 National Fuel Gas
Code (US) NFPA 54/ANSI Z223.1—latest
edition, or (Canada) CAN/CGA-B149.1—
latest edition.
Flame breadth, height and width will diminish
4% for every 1,000 feet of altitude.

Burn-in Period

During the first few fires of this appliance
there will be some odor due to the curing of
the paint and burning off of lubricants used
in the manufacturing process. Depending on
your use, the burn-in period may take a few
hours or a few days.
KEEP YOUR HOUSE WELL VENTILATED
DURING THE CURING PROCESS. THE ODOR
AND HAZE EMITTED DURING THE CURING
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
NOTICE:
on the glass enclosure panel during
the first few fires as part of the burn-in
process.
The first few times you use the
fireplace, clean the glass after each use
(AFTER THE GLASS HAS COMPLETELY
COOLED); otherwise, the white film
• Part /Cat. Number
will bake onto the glass and become
difficult to remove.
See glass cleaning instructions on
Page 12.
A white film may develop
7