dryers. Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they shall operate at maximum
speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so the appliance
shall operate continuously.
5. Test for draft hood equipped appliance spillage at the draft
hood relief opening after 5 minutes of main burner opera-
tion. Use the flame of a match or candle.
6. After it has been determined that each appliance con-
nected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning appliance to
their previous conditions of use.
7. If improper venting is observed during any of the above
tests, the venting system must be corrected.
8. Any corrections to the common venting system must be in
accordance with the National Fuel Gas Code Z223.1 or
CAN/CGA-B149.1 or .2 Installation Code (latest editions). If
the common vent system must be resized, it should be
resized to approach the minimum size as determined using
the appropriate tables in Appendix G of the above codes.
SPECIFIC UNIT INFORMATION
LIMITATIONS & LOCATION
This furnace should be installed in accordance with all national
and local building/safety codes and requirements, or in the
absence of local codes, with the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA-B149.1 or .2 Installation Code (latest
editions), local plumbing or waste water codes, and other
applicable codes.
Downflow/horizontal models are AGA/CGA listed for downflow
application into a manufactured (mobile) home.
Upflow models or horizontal applications are not approved for
mobile homes.
A manufactured (mobile) home installation must conform with
the Manufactured Home Construction and Safety Standard,
Title 24 CFR, Part 3280, or when this standard is not applicable,
the Standard for Manufactured Home Installations (Manufac-
tured Home Sites, Communities and Set-Ups), ANSI A225.1,
and/or CAN/CSA-Z240 MH Series, Mobile Homes.
CLEARANCES FOR ACCESS
Ample clearances should be provided to permit easy access
to the unit. The following minimum clearances are recom-
mended:
1. Twenty-four (24) inches between the front of the furnace
and an adjacent wall or another appliance, when access
is required for servicing and cleaning.
2. Eighteen (18) inches at the side where access is required
for passage to the front when servicing or for inspection or
replacement of flue/vent connections.
NOTE: In all cases, accessibility clearances shall take prece-
dence over clearances for combustible materials where
accessibility clearances are greater.
CAUTION: Do not install the furnace in an uncondi-
tioned space or garage that could experience ambient
temperatures of 32
°
F (0
°
C) or lower. For application
in below freeezing locations, refer to special require-
ments on page 6.
CAUTION: The furnace is not to be used for tempo-
rary heating of buildings or structures under construc-
tion.
CAUTION: This unit must be installed in a level ( 1/4")
position side-to-side and front-to-back to provide
proper condensate drainage.
CAUTION: Do not allow return air temperature to be
below 55
°
F for extended periods. To do so may cause
condensation to occur in the main fired heat ex-
changer.
WARNING: Furnaces shall not be installed directly on
carpeting, tile or other combustible material other
than wood flooring. An accessory combustible floor
base is available to allow direct installation of down-
flow models on combustible flooring.
WARNING: Furnace shall be installed so the electri-
cal components are protected from water.
The size of the unit should be based on an acceptable heat loss
calculation for the structure.
Check the rating plate to make certain the unit is equipped for
the type of gas supplied, and proper electrical characteristics
are available.
For installations above 2,000 feet, reduce input 4% for each
1,000 feet above sea level. Refer to Form 650.75-N2.1V for
correct pressure switch/orifice or other required conversion
information.
A furnace installed in a residential garage shall be located so
that all burners and burner ignition devices are located not less
than 18" above the garage floor, and located or protected to
prevent damage by vehicles.
Allow clearances from combustible materials as listed under
"Clearances to Combustibles", ensuring that service access is
allowed for both the burners and blower.
When the furnace is used in conjunction with a cooling coil, the
furnace must be installed parallel with or on the upstream side
of the cooling unit to avoid condensation in the primary heat
exchanger.
When a parallel flow arrangement is used, the dampers or other
means used to control air flow shall be adequate to prevent
chilled air from entering the furnace, and if manually operated,
must be equipped with means to prevent operation of either
unit unless the damper is in the full heat or cool position.
650.75-N4U
Unitary Products Group
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