Lennox Hearth INTERTEK LMBV-42REN User Manual
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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
Test gauge connections are provided on the
front of the millivolt gas control valve (iden-
tified E for the inlet and A for the manifold
side). A 1/8" NPT test gage connection is
provided at the inlet and manifold side of
the electronic gas control valve.
manifold Gas Supply pressure
(all models)
Fuel #
Low
High
Natural
Gas
(Lo) 2.2" WC
(0.55 kpa)
(Hi) 3.5" WC
(0.87 kpa)
propane (Lo) 6.3" WC
(1.57 kpa)
(Hi) 10.0" WC
(2.49 kpa)
Table 3
Inlet Gas Supply pressure
(all models)
Fuel #
minimum
maximum
Natural Gas
4.5" WC
(1.12 kpa)
10.5" WC
(2.62 kpa)
propane
11.0" WC
(2.74 kpa)
13.0" WC
(3.24 kpa)
Table 2
Gas pressure - All models
Tables 2 and 3 show the appliances' inlet and
manifold gas pressure requirements:
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).
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 "*" 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.
• By 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 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/CGA-B149.1 - latest edition.
Flame breadth, height and width will diminish
4% for every 1,000 feet of altitude.
In Canada - CAN/CGA-2.17-m91 (R2009) (high
altitude): THe CONveRSION SHALL be CAR-
RIeD OUT bY A mANUFACTUReR’S AUTHO-
RIZeD RepReSeNTATIve, IN ACCORDANCe
WITH THe ReQUIRemeNTS OF THe mANU-
FACTUReR, 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.
burner Orifice Sizes (all models)
elevation
Feet (meters)
Natural
Gas
drill size (inches)
propane
Gas
drill size (inches)
0-4500
(0-1372)
#37 (0.104")
*
H5830 •
1.65mm (0.065")
*
H5831 •
Table 4
* Standard size installed at factory
• Part /Cat. Number
ReQUIRemeNTS FOR THe COmmON-
WeALTH 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 Com-
monwealth 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.
Figure 2 - Honeywell Electronic Gas Valve
ON/OFF Switch
Electronic
Gas Control
Valve
Inlet
Pressure
Port
Manifold Pressure Port
OFF
IN
P
S
I
ON
CONTROL
IG
N
IT
ER
Figure 1 - SIT Millivolt Gas Valve
E
A
TPTH
TP
TH
PILO
T
PIL
OT
ON
it
OFF
piezo
Igniter
manifold pressure Tap
Inlet pressure Tap
pilot Adjustment
Screw
main Gas Control Knob
OFF/pILOT/ON
Gas valve Diagrams
See Figure 1 for Millivolt models and Figure 2
For Electronic Models.