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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

3

Summary of Contents for 65075-N4U

Page 1: ...r other flammable vapors and liquids in the vicinity of this or any other appliance WARNING IMPROPER INSTALLATION ADJUSTMENT AL TERATION SERVICE OR MAINTENANCE CAN CAUSE INJURY OR PROPERTY DAMAGE RE F...

Page 2: ...ce 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...

Page 3: ...e 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...

Page 4: ...95 2000 C 21 19 3 4 16 5 8 2 2 120 112 2000 D 24 1 2 23 1 4 20 1 8 3 2 3 140 130 2000 D 24 1 2 23 1 4 20 1 8 3 2 3 Vent pipe must be increased to 3 on this model INPUT MBH OUTPUT MBH NOM CFM CAB WIDTH...

Page 5: ...75 1200 17 1 2 91 0 35 65 1370 165 11 8 1 2 9 0 20 14 80 75 1600 21 91 0 30 60 1563 160 11 8 3 4 12 0 20 14 100 95 2000 21 91 0 40 70 1582 170 11 10 1 12 0 20 14 120 112 2000 24 1 2 91 0 40 70 1885 1...

Page 6: ...ambient temperature may drop below 32 F a UL listed self regulated heat tape must be installed It is recommended that self regulating heat tape rated at 3 watts per foot be used This must be installe...

Page 7: ...r sides of the cabinet wall NOTE Air velocity through throw away type filters may not exceed 300 feet per minute All velocities over this require the use of high velocity filters Side Return External...

Page 8: ...n sions Install the plenum following instructions under Ductwork in this instruction SUPPLY AIR DUCTS Installations on combustible material or floors must usea combus tible floor base shown in Figure...

Page 9: ...ezing are possible refer to Page 6 Below Freezing Locations GAS PIPING The gas supply must be installed in accordance with the current National Fuel Gas Code ANSI Z223 1 in the U S or CAN CGA B149 1 o...

Page 10: ...switch should be close to the unit for convenience in servicing With the disconnect switch in the OFF position check all wiring against the unit wiring label Also see the wiring diagram in this instru...

Page 11: ...nnection top right of unit back to the outdoors See Figure 13 or 14 The intake vent should be located either through the wall horizontal or side vent or through the roof vertical vent Care should be t...

Page 12: ...roofor sidewall NOTE Accessory concentric intake vent terminations models 1CT0302 and 1CT0303 are available and approved for use with these furnaces Refer to Form 650 75 N2 4V for installation details...

Page 13: ...ning at the furnace 2 Deburr the piping inside and outside 3 Chamfer the outer edges of the piping 4 Dry fit the entire vent combustion air piping assembly 5 Disassemble the piping and apply cement pr...

Page 14: ...the furnace This may be from within the space in a non confined location or it may be brought into the furnace area from outdoors It is not directly ducted into the furnace A single properly sized pi...

Page 15: ...m dimension of rectangular ducts shall be three inches 2 One permanent opening commencing within 12 inches of the top of the enclosure shall be permitted where the equipment has clearances of at least...

Page 16: ...t connections NOTE An offset using two 45 degree elbows may be required for plenum clearance when the vent is increased to 3 1 Long radius elbows are required for all units 2 Elbows are assumed to be...

Page 17: ...on may require seal ing or shielding of building surfaces with a corrosive resistant material due to vent system corrosive combus tion products PIPING ASSEMBLY The final assembly procedure for the ven...

Page 18: ...e allowable locations shown in Figure 24 and Section 7 8 in the National Fuel Gas Code ANSI Z223 1 current edition Follow all local agency and utility requirements if more restrictive than those shown...

Page 19: ...w the instructions with the coil for trapping the drain SAFETY CONTROLS Control Circuit Fuse A 3 amp fuse is provided to protect the 24 volt transformer from overload caused by control circuit wiring...

Page 20: ...blower motor failure START UP AND ADJUSTMENTS The initial start up of the furnace requires the following addi tional procedures 1 When the gas supply is initially connected to the furnace the gas pip...

Page 21: ...MPLE CHECKING GAS INPUT It is found by measurement that it takes 26 seconds for the hand on the 1 cubic foot dial to make a revolution with only a 120 000 Btuh furnace running Using this information l...

Page 22: ...and electrical supplies ON Start furnace and observe manifold pressure on manometer 5 Adjust manifold pressure by adjusting gas valve regulator screw for natural gas set at 3 5 W C If gas valve regula...

Page 23: ...or lead Place all unused motor leads on Park terminals Two Park terminals are provided CAUTION Do not energize more than one motor speed at a time or damage to the motor will result ADJUSTMENT OF FAN...

Page 24: ...the thermostat circuit opens the ignition control is deener gized Withtheignitioncontroldeenergized thegasflowstopsand the burner flames are extinguished The venter continues to operate for 15 seconds...

Page 25: ...me Lift filter slightly to dislodge and remove for service 3 Remove the filter and follow the cleaning instructions above DO NOT remove the filter stiffener rods if provided When reinstalling the filt...

Page 26: ...blower and the condensate pan The turbulators can then be gently re moved from the secondary heat exchanger 3 With a stiff wire brush brush out loose scale or soot 4 Vacuum the secondary heat exchang...

Page 27: ...e is lost 5 times during the heating cycle This could be caused by low gas pressure or faulty gas valve 9 FLASH TI61F 2 CONTROL ONLY Indicates reversed line voltage polarity Check incoming power wirin...

Page 28: ...985 835 757 665 450 MED 900 887 851 810 752 693 609 403 LOW 581 577 569 542 468 60 55 1000 B HI 1220 1200 1190 1152 1115 1065 1012 950 872 771 MED 920 915 900 880 842 803 740 650 LOW 725 729 715 700...

Page 29: ...UNIT WIRING DIAGRAM UPFLOW 650 75 N4U Unitary Products Group 29...

Page 30: ...UNIT WIRING DIAGRAM DOWNFLOW HORIZONTAL...

Page 31: ...NOTES 650 75 N4U Unitary Products Group 31...

Page 32: ...ect to change without notice Printed in U S A Copyright by Unitary Products Group 1998 All rights reserved 650 75 N4U Supercedes 650 75 N4U 498 5005 York Drive Norman OK 73069 Unitary Products Group 6...

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