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650.75-N4U
GENERAL INFORMATION
TABLE OF CONTENTS
Description .........................................................................2
Inspection ...........................................................................2
Notes, Cautions, & Warnings .............................................2
Vent Safety Check Procedure ........................................ 2-3
Limitations & Location ........................................................3
Clearances ................................................................... 3 & 5
Dimensions ........................................................................4
Ratings & Physical Data .....................................................4
Unit Wiring Diagram .................................................... 29-30
UNIT INSTALLATION
Ductwork ............................................................................6
Filters ............................................................................ 7 - 9
Gas Piping ..........................................................................9
Electrical Power/Control Connection ....................... 10 - 11
Combustion Air & Vent System ........................................11
Two-Pipe System..................................................... 11-14
One-Pipe System .................................................... 14-18
DESCRIPTION
This Category IV, dual certified, direct vent and 1-pipe vent
furnace is designed for residential or commercial installation in
a basement, closet, recreation room, garage or other location
provided space temperature is 32°F or higher. For application
in below freezing locations, refer to special instructions on page
6.
INSPECTION
As soon as a unit is received, it should be inspected for possible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier's freight bill. A separate
request for inspection by the carrier's agent should be made in
writing. Also, before installation the unit should be checked for
screws or bolts which may have loosened in transit. There are
no shipping or spacer brackets which need to be removed.
NOTES, CAUTIONS, & WARNINGS
The installer should pay particular attention to the words:
NOTE, CAUTION and WARNING. NOTES are intended to
clarify or make the installation easier. CAUTIONS are given to
prevent equipment damage. WARNINGS are given to alert the
installer that personal injury and/or equipment or property damage
may occur if installation procedures are not handled properly.
CAUTION: The cooling coil must be installed in the
supply air duct, downstream of the furnace. Cooled
air may not be passed over the heat exchanger.
The furnace room must not be used as a broom closet or for
any other storage purposes as a fire hazard may be created.
Never store items such as the following on, near, or in contact
with the furnace.
1. Spray or aerosol cans, rags, brooms, dust mops, vacuum
cleaners or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning com-
pounds; plastic items or containers; gasoline, kerosene,
2
Two-Pipe Using Attic Combustion Air ............................18
Condensate Piping ................................................... 18 - 19
Safety Controls ......................................................... 19 - 20
Start-Up & Adjustments ...................................................20
Ignition System Sequence ...............................................20
Checking Gas Input .................................................. 21 - 22
Adjustment of Manifold Gas Pressure ...................... 22 -23
Adjustment of Temperature Rise ......................................23
Adjustment of Fan Control Settings .................................23
Accessory Connections ........................................... 23 - 24
Sequence of Operation ............................................. 24 -25
Maintenance ............................................................. 25 - 26
Air Filters ........................................................................25
Blowers ..........................................................................25
Burners ..........................................................................26
Lubrication ......................................................................25
Cleaning Heat Exchangers ............................................26
Vent/Air ............................................................................26
Troubleshooting ................................................................26
Furnace Control Diagnostics .................................... 26 - 27
Airflow Data.......................................................................28
cigarette lighter fluid; dry-cleaning fluids or other volatile
fluid.
3. Paint thinners and other painting compounds.
4. Paper bags or other paper products.
WARNING: Never operate the furnace with the blower
door removed. To do so could result in serious per-
sonal injury and/or equipment damage.
WARNING: This furnace may not be common vented
with any other appliance, since it requires separate,
properly-sized air intake and vent lines. The furnace
shall not be connected to any type of B, BW or L vent
or vent connector, and not connected to any portion
of a factory-built or masonry chimney.
VENT SAFETY CHECK PROCEDURE
If this furnace is replacing a common-vented furnace, it may be
necessary to resize the existing vent line and chimney to
prevent oversizing problems for the new combination of units.
Refer to the National Gas Code (ANSI Z223.1) or
CAN/CGAB149.1 or .2 Installation Code (latest editions).
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while any
other appliances connected to the venting system are not in
operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1, or the CAN/CGA B149 Installation Codes and
these instructions. Determine that there is no blockage or
restriction, leakage, corrosion or other deficiencies which
could cause an unsafe condition.
3. Insofar as is practical, close all building doors and windows
and all doors between the space in which the appliance(s)
is located and other spaces of the building. Turn on clothes
Unitary Products Group
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