Lennox NV35IN Care And Operation Instructions Manual page 7

LENNOX HEARTH PRODUCTS • SIGNATURE
BTU Input
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.
Table 1: Input Rate, Gas Valves
Input Rate (BTU/HR)
Models
Natural Gas
35,500 high
NV35IN
15,500 low
31,000 high
NVCD35IN
16,000 low
41,500 high
NV40IN
15,500 low
40,000 high
NVCD40IN
21,000 low
47,000 high
NV45IN
18,000 low
47,000 high
NVCD45IN
24,000 low
Gas Pressure
Table 2 and Table 3 show the appliance
inlet and manifold gas pressure
requirements.
Table 2: Inlet Gas Supply Pressure
Fuel Minimum
4.5 in. WC
Natural Gas
(1.12 kPa)
11.0 in. WC
Propane
(2.74 kPa)
Table 3: Manifold Gas Supply Pressure
Fuel Low
1.6 in. WC
Natural Gas
(0.40 kPa)
6.3 in. WC
Propane
(1.57 kPa)
Test gauge connections are provided on
the front of the electronic gas control valve
(identified IN for the inlet and OUT for the
manifold side). The control valves have a
3/8 in. (10 mm) NPT thread inlet and outlet
side of the valve (Figure 1).
SERIES DIRECT-VENT GAS FIREPLACES • ENVY/ENVY CD 35/40/45 • CARE AND OPERATIONS
®
Figure 1: SIT Electronic Gas Valve
Inlet (IN) Test Port
Manifold (OUT)
Test Port
Orange Wire
(from DFC
wire
Propane Gas
harness)
35,000 high
18,000 low
Main
28,000 high
Gas Inlet
15,000 low
3/8 in. NPT
37,000 high
14,500 low
32,000 high
18,500 low
45,000 high
Propane tanks are at pressures that will
18,000 low
cause damage to valve components. Verify
that the tanks have step down regulators to
40,000 high
22,000 low
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
Maximum
its equipment shutoff valve during any
pressure testing of the gas supply piping
10.5 in. WC
system at test pressures equal to or less
(2.61 kPa)
than 1/2 psi (3.5 kPa).
13.0 in. WC
(3.23 kPa)
Orifice Sizes—Sea Level to
High Altitude
High
These appliances are tested and approved
3.5 in. WC
for installation at elevations of 0–4500 ft
(0.87 kPa)
(0–1372 m) above sea level using the
10.0 in. WC
standard burner orifice sizes (marked with
(2.49 kPa)
an "*" in Table 4).
For elevations above 4500 ft, 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.
NOTE: Flame breadth, height and width will
diminish 4% for every 1,000 feet of altitude.
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Green Wire
Hi/Lo
(from DFC wire
Flame
harness)
Control
Knob
Yellow Ground Wire
(from DFC
wire harness)
Table 4: Burner Orifice Sizes,
Elevation 0–4500 ft ( 0–1372 m)
Natural Gas
Model
drill size
Front
#49 (0.073 in.)*
NV35IN
Back
#43 (0.089 in.)*
Front
#42 (0.0935 in.)*
NVCD35IN
Back
#55 (0.052 in.)*
Front
#41 (0.096 in.)*
NV40IN
Back
#43 (0.089 in.)*
Front
#35 (0.11 in.)*
NVCD40IN
Back
#52 (0.0635 in.)*
Front
#40 (0.098 in.)*
NV45IN
Back
#40 (0.098 in.)*
Front
#32 (0.116 in.)*
NVCD45IN
Back
#49 (0.073 in.)*
* Standard size installed at factory
• Catalog number
Burn-in Period
During the first few times this appliance
is operated, there will be some odor due
to the curing of the paint and burning off
of lubricants used in the manufacturing
process. Depending on usage, the burn-in
period may take a few hours or a few days.
NOTE: Ventilate the house during the curing
process. The resulting odor and haze may
set off a smoke detector. Do not operate the
blower during the burn-in period.
A white film may develop on the glass
front during the first few fires as part of the
curing process. The glass should be kept
clean during the first two weeks of use to
prevent the film from baking on—making it
very difficult to remove (Cleaning the glass
door on Page 11)
Propane
drill size
Front
#57 (0.043 in.)*
Back
#54 (0.055 in.)*
Front
#55 (0.052 in.)*
Back
#60 (0.040 in.)*
Front
#55 (0.052 in.)*
Back
#55 (0.052 in.)*
Front
#53 (0.0595 in.)*
Back
#65 (0.035 in.)*
Front
#54 (0.055 in.)*
Back
#54 (0.055 in.)*
Front
#51 (0.067 in.)*
Back
#62 (0.038 in.)*
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