Lennox MLDVT-30NM Care And Operation Instructions Manual page 3

input (Btu) Manually-Modulated
Gas Valves (all models)
naturaL Gas
Models input rate (Btu / Hr)
13,500 high
MLdVt-30n
10,500 low
16,000 high
MLdVt-35n
12,500 low
22,000 high
MLdVt-40n
17,000 low
23,000 high
MLdVt-45n
17,500 low
Table 1
input (Btu) Manually-Modulated
Gas Valves (all models)
propane Gas
Models input rate (Btu / Hr)
12,500 high
MLdVt-30p
9,000 low
15,000 high
MLdVt-35p
11,500 low
20,000 high
MLdVt-40p
15,800 low
22,000 high
MLdVt-45p
17,000 low
Table 2
Gas pressure -
Tables 3 and 4 show the appliances' gas
pressure requirements.
inlet Gas supply pressure
(all models)
Fuel # Minimum
4.5" Wc
natural Gas
(1.12 kpa)
11.0" Wc
propane
(2.74 kpa)
Table 3
Manifold Gas supply pressure
(all models)
Fuel # Low
natural (Lo) 2.2" Wc
Gas (0.55 kpa)
(Lo) 6.3" Wc
propane
(1.57 kpa)
Table 4
Do not use these appliances if any part has
been under water. Immediately call a qualified,
professional service technician to inspect the
appliance and to replace any parts of the con-
trol system and any gas control which have
been under water.
Ne pas se servir de cet appareil s'il a été
plongé dans l'eau, complètement ou en partie.
Appeler un technicien qualifié pour inspecter
l'appareil et remplacer toute partie du système
de contrôle et toute commande qui ont été
plongés dans l'leau.
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 on page 5). A 1/8" NPT Test
gauge connection is provided at the inlet and
outlet (manifold) ports on the electronic gas
control valve (see Figure 4 on page 5).
These appliances must be isolated from the
gas supply piping system (by closing their
individual manual shut-off 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 shut-off
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).
These appliances must not be connected to a
chimney or flue serving a separate solid fuel
burning appliance.
Maximum
WarninG: Failure to comply with
10.5" Wc
the installation and operating
(2.61 kpa)
instructions provided in this docu-
13.0" Wc
ment will result in an improperly
(3.23 kpa)
installed and operating appliance,
voiding its warranty. any change to
this appliance and/or its operating
controls is dangerous. improper
installation or use of this appli-
ance can cause serious injury or
High
death from fire, burns, explosion
(Hi) 3.5" Wc
or carbon monoxide poisoning.
(0.87 kpa)
(Hi) 10.0" Wc
(2.49 kpa)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
carbon Monoxide poisoning: early signs
of carbon monoxide poisoning are similar
to the flu with headaches, dizziness and/or
nausea. if you have these signs, obtain fresh
air immediately. turn off the gas supply to
the appliance and have it serviced by a quali-
fied professional, as it may not be operating
correctly.
WarninG: do not place clothing
or other flammable materials on
or near this appliance.
aVertisseMent: surveiller les
enfants. Garder les vêtements,
les meubles, l'essence ou autres
liquides à vapeur inflammables à
cote de l'appareil.
WarninG: children and adults
should be alerted to the hazards
of high surface temperatures.
use caution around the appli-
ance to avoid burns or clothing
ignition. Young children should
be carefully supervised when
they are in the same room as the
appliance.
orifice sizes - sea Level to High altitude
(all Models): These appliances are tested and
approved for installations at elevations of 0-4500
feet (0-1372 meters) above sea level using the
standard burner orifice sizes (marked with an
"*" in Table 5 ).
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.
Burner orifice sizes
elevation 0-4500 feet ( 0-1372 meters)
Model nat.Gas
series drill size (inches)
#50 (0.070")* #59 (0.041")*
MLdVt-30
H4873•
#49 (0.073")*
MLdVt-35
21L82•
#43 (0.089")* #55 (0.052")*
MLdVt-40
99K75•
0.090"* #54 (0.055")*
MLdVt-45
37L70•
Table 5 * Standard size installed at factory
• Part /Cat. Number
propane
drill size (inches)
H7838
0.045"*
75L10•
19L52•
99K79•
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