General Information - Lennox MLDVT-30NM Care And Operation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT

GENERAL INFORMATION

The fireplace models covered in this manual
are direct-vent sealed combustion gas fireplace
heaters designed for residential application.
These 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.
The Millivolt appliances have a millivolt gas
control valve with piezo ignition system. If any
optional accessories which require electrical
power are being installed, the electrical power
must be provided at the time of appliance in-
stallation.
The Electronic appliances have a battery backed-
up electronic intermittent pilot system. The bat-
tery backup will allow you to continue operation
of the appliance during a power outage.
These appliances comply with National Safety
Standards and are tested and listed by ETL/
Intertek (Report No. 100326540PRT-001) to
ANSI Z21.88 (in Canada, CSA-2.33), and CAN/
CGA-2.17-M91 in both USA and Canada, as
vented gas fireplace heaters.
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 (In Canada, the current CAN/CSA-B149.1
installation code).
The appliance, when installed, must be
electrically grounded and wired 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
Millivolt and electronic models come standard
with a manually-modulated gas valve; flame
appearance and heat output can be controlled
at the gas valve. The BTU Input for these ap-
pliances are shown in Table 1.
Input (BTU/HR) Manually-Modulated
Gas Valves (all models)
Input Rate (BTU / HR)
Model
Nat. Gas
13,500 high
MLDVT-30
10,500 low
16,000 high
MLDVT-35
12,500 low
20,000 high
MLDVT-40
15,500 low
23,000 high
MLDVT-45
17,500 low
Table 1
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS
®
Gas Pressure Requirements
(All Models)
Gas pressure requirements are listed in
Tables 2 and 3.
Test gauge connections are provided on the
front of the millivolt gas control valve, identi-
fied IN for the inlet and OUT for the manifold
side (see Figure 3 and Figure 4 on Page 9).
Inlet Gas Supply Pressure (all models)
Fuel #
Natural Gas
Propane
Table 2
Manifold Gas Supply Pressure (all models)
Fuel #
Natural
Gas
Propane
Table 3
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).
Burn-in Period
During the first few fires in 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
Prop. Gas
use, the burn-in period may take a few hours
12,500 high
or a few days.
9,000 low
15,000 high KEEP YOUR HOUSE WELL VENTILATED
11,500 low
DURING THE BURN-IN PROCESS. THE ODOR
AND HAZE EMITTED DURING THE BURN-IN
20,000 high
15,800 low
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
22,000 high
17,000 low
If an optional blower is installed, do NOT turn
it on during the burn-in period.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Minimum Maximum
4.5" WC 10.5" WC
(1.12 kPa) (2.61 kPa)
11.0" WC 13.0" WC
(2.74 kPa) (3.23 kPa)
Low High
(Lo) 2.2" WC (Hi) 3.5" WC
(0.55 kPa) (0.87 kPa)
(Lo) 6.3" WC (Hi) 10.0" WC
(1.57 kPa) (2.49 kPa)
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 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/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% per
thousand feet.
Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model Nat.Gas
Series drill size (inches) drill size (inches)
#50 (0.070")* #59 (0.041")*
MLDVT-30
H4873 •
(0.0748")*
MLDVT-35
H1355 •
#44 (0.086")* #55 (0.052")*
MLDVT-40
60J80 •
(0.090")* #54 (0.055")*
MLDVT-45
37L70 •
*
Standard size installed at factory.
Table 4
•
Part /Cat. Number.
IMPORTANT NOTE!
A white film may develop 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 will bake onto the
glass and become difficult to
remove.
See "Cleaning Glass" on Page 10.
Propane
H7838 •
(0.045")*
75L10 •
19L52 •
99K79 •
7