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Gas Information
A. Fuel Conversion
• Make sure the appliance is compatible with available gas
types.
• Conversions must be made by a qualified service
technician using Hearth & Home Technologies specified
and approved parts.
B. Gas Pressure
WARNING
Fire Risk.
Risk of Fire! Risk of Explosion!
Incorrect pressure will damage valve.
• Isolate gas supply piping BEFORE pressure
testing gas line at test pressures above 1/2
psig.
• Close the manual shutoff valve BEFORE
pressure testing gas line at test pressures
equal to or less than 1/2 psig.
• Optimum appliance performance requires proper input
pressures.
• Gas line sizing requirements will be determined in ANSI
Z223.1 National Fuel Gas Code in the USA and CAN/
CGA B149 in Canada.
• Pressure requirements are:
Gas Pressure
Minimum inlet pressure
Maximum inlet pressure
Manifold pressure
• Verify inlet pressures. Verify minimum pressures when
other household gas appliances are operating.
• Install regulator upstream of valve if line pressure is
greater than 1/2 psig.
Note: Have the gas supply line installed in accordance with
local codes, if any. If not, follow ANSI Z223.1. Installation
should be done by a qualified installer approved and/or
licensed as required by the locality. (In the Commonwealth
of Massachusetts installation must be performed by a
licensed plumber or gas fitter).
Note: A listed (and Commonwealth of Massachusetts ap-
proved) 1/2 in. (13 mm) T-handle manual shut-off valve
and flexible gas connector are connected to the 1/2 in. (13
mm) control valve inlet.
• If substituting for these components, please consult
local codes for compliance.
Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
Natural Gas
Propane
5.0 in. w.c.
11.0 in. w.c.
10.0 in. w.c.
13.0 in. w.c.
3.5 in. w.c.
10.0 in. w.c.
C. Gas Connection
• Refer to Section 3 for location of gas line access in
appliance.
• Gas line may be run through knockout(s) provided.
• The gap between supply piping and gas access hole
may be sealed with caulk or aluminum foil tape with a
minimum of 300 ºF continuous exposure rating or stuffed
with non-combustible, unfaced insulation to prevent cold
air infiltration.
• Ensure that gas line does not come in contact with outer
wrap of the appliance. Follow local codes.
• Pipe incoming gas line into valve compartment.
• Connect incoming gas line to the 1/2 in. (13 mm) NPT
connection on manual shutoff valve.
WARNING! Risk of Fire or Explosion! Support control
when attaching pipe to prevent bending gas line.
WARNING! Risk of Fire or Explosion! Gas build-up
during line purge could ignite.
• A small amount of air will be in the gas supply lines.
• Ensure adequate ventilation.
• Ensure there are no ignition sources such as sparks or
open flames.
Light the appliance. It will take a short time for air to purge
from lines. When purging is complete the appliance will
light and operate normally.
WARNING! Risk of Fire, Explosion or Asphyxiation!
Check all fittings and connections with a non-corrosive
commercially available leak-check solution. DO NOT use
open flame. Fittings and connections could have loos-
ened during shipping and handling.
D. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certified without a
reduction of input rate for elevations up to 4500 feet
(1370 m)above sea level. Please consult provincial and/
or local authorities having jurisdiction for installations at
elevations above 4500 feet (1370 m).
Check with your local gas utility to determine proper
orifice size.
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