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Humidifier
The furnace control board provides output terminals for
an optional humidifier (HUM) that can be installed on your
system. The HUM output is energized any time the furnace
inducer motor is energized. Control ratings are 1.0 Amp. @
240 VAC. Output connections are made via board terminals
labeled HUM and NEUTRAL.
Check all factory wiring to the units wiring diagram. Inspect the
factory wiring connections to be sure none loosened during
shipping or installation.
GAS SUPPLY & PIPING
WARNING:
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result
in serious injury, death, or property damage.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
• Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
• All gas piping must be installed in compliance with
local codes and utility regulations. In the absence of
local codes the gas line installation must comply with
the latest edition of the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA B149 Installation Codes.
• Some local codes require the installation of a manual
main shut-off valve and ground joint union external to the
unit. The shut-off valve should be readily accessible for
service and/or emergency use. Consult the local utility
or gas supplier for additional requirements regarding
placement of the manual main gas shut-off. See
7 (page
13).
• The manifold pressure must be set to the appropriate
value for your installation. Refer to the Manifold
Pressure Adjustment section
instructions.
• Gas piping must never run in or through air ducts,
chimneys, gas vents, or elevator shafts.
• The main gas shutoff valve and main power disconnect
to the unit must be properly labeled by the installer in
case emergency shutdown is required.
• An 1/8 inch NPT plugged tap must be installed in
the gas line immediately upstream of the gas supply
connection to the unit for use when measuring the gas
supply pressure. The plug should be readily accessible
for service use.
• A drip leg should be installed in the vertical pipe run to
the unit. See Figure 7.
12
Figure
(page
14) for adjustment
This unit only has right side gas entry. When connecting the
gas, provide clearance between the gas supply line and the
entry hole in the unit's casing to avoid unwanted noise and/
or damage to the unit. A typical gas service hookup is shown
in
Figure
7.
Table 8 (page 21)
lists gas pipe capacities for standard pipe
sizes as a function of length in typical applications based on
nominal pressure drop in the line.
Leak Check
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death, or property damage.
Never test for gas leaks with an open flame. Use
a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
After the gas piping to the unit is complete, all connections
must be tested for gas leaks. This includes pipe connections
at the main gas valve, emergency shutoff valve and other
gas connectors. A soap and water solution can be applied on
each joint or union using a small paintbrush. If any bubbling
is observed, the connection is not sealed adequately and
must be retightened. Repeat the tightening and soap check
process until bubbling ceases.
• If pressure testing the gas supply lines at pressures
greater than 1/2 psig (14 inches WC), the unit must be
disconnected from the gas supply piping system to
prevent damage to the gas valve.
• If the test pressure is less than or equal to 1/2 psig
(14 inches WC), the unit must be isolated from the gas
supply line by closing the manual shut-off valve.
High Altitude Conversion - Natural Gas
For installations between zero and 5000 ft above sea level,
the factory installed gas orifice should be used. High altitude
conversion with this furnace depends on the installation
altitude and the heating value of the gas. Installation of this
furnace at altitudes above 2,000 feet shall be in accordance
with local codes, or in the absence of local codes, the National
Fuel Gas Code, ANSI Z223.1/NFPA 54. Please consult your
local code authority.
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished with
factory supplied orifices. Do not attempt to drill out
orifices in the field. Improperly drilled orifices may
cause fire, explosion, carbon monoxide poisoning,
personal injury or death.
The furnaces are shipped from the factory with orifices and
gas regulator settings for natural gas operation up to 5000
ft. At 2,000 feet, the NFGC requires that this appliance be
derated 4% for each 1,000 feet of altitude. For example, at
2,000 feet the input needs to be reduced 8%, at 3,000 feet
(12%), etc. This deration is in reference to the input rate and
gas heating value at sea level.
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