4
13. These furnaces SHALL NOT be installed directly on carpet-
ing, combustible tile, or any other combustible material oth-
er than wood flooring. In downflow installations, factory
accessory floor base MUST be used when installed on com-
bustible materials and wood flooring. Special base is not re-
quired when this furnace is installed on manufacturer’s Coil
Assembly Part No. CNRV, CNPV, CAP, or CAR or when
Coil Box Part No. KCAKC is used. See Table 2 for clear-
ance to combustible construction information.
Important Installation and Start
−
up Procedures
Failure to follow this procedure may result in a nuisance
smoke or odor complaint.
The manifold pressure, gas rate by meter clocking,
temperature rise and operation must be checked after
installation. Minor smoke and odor may be present
temporarily after start
−
up from the manufacturing process.
Some occupants are more sensitive to this minor smoke and
odor. It is recommended that doors and windows be open
during the first heat cycle.
NOTICE
INTRODUCTION
This 4
−
way multipoise Category IV condensing furnace is CSA
design
−
certified as a direct
−
vent (2-pipe) or non-direct vent
(1-pipe) furnace. See Fig. 2. The furnace is factory
−
shipped for
use with natural gas. The furnace can be converted in the field for
use with propane gas when a factory-supplied conversion kit is
used. Refer to the furnace rating plate for conversion kit
information.
These furnaces are not approved for installation in recreational
vehicles or outdoors. Single
−
stage furnaces (40,000 through
120,000) are approved for installation in manufactured
housing/mobile homes with manufacturer
−
approved accessory.
The conversion kit is required for use with both natural and
propane gas. The furnace must also be installed on a
factory-supplied accessory combustible floor base or evaporator
coil casing.
This furnace is designed for minimum continuous return
−
air
temperature of 60
F (15
C) db or intermittent operation down to
55
F (13
C) db such as when used with a night setback
thermostat. Return-air temperature must not exceed 80
F (27
C)
db. Failure to follow these return-air temperature limits may affect
reliability of heat exchangers, motors, and controls. See Fig.
The furnace should be sized to provide 100 percent of the design
heating load requirement plus any margin that occurs because of
furnace model size capacity increments. None of the furnace
model sizes can be used if the heating load is 20,000 BTU or
lower. Use Air Conditioning Contractors of America (Manual J
and S); American Society of Heating, Refrigerating, and
Air-Conditioning Engineers; or other approved engineering
method to calculate heating load estimates and select the furnace.
Excessive oversizing of the furnace may cause the furnace and/or
vent to fail prematurely, customer discomfort and/or vent freezing.
Failure to follow these guidelines is considered faulty installation
and/or misapplication of the furnace; and resulting failure, damage,
or repairs may impact warranty coverage.
For accessory installation details, refer to the applicable instruction
literature.
NOTE
: Remove all shipping materials, loose parts bag, and
literature before operating the furnace. See Table 1.
CODES AND STANDARDS
Follow all national and local codes and standards in addition
to these instructions.
The installation must comply with
regulations of the serving gas supplier, local building, heating,
plumbing, and other codes. In absence of local codes, the
installation must comply with the national codes listed below and
all authorities having jurisdiction.
In the United States and Canada, follow all codes and standards for
the following:
Safety
US: Current edition of National Fuel Gas Code (NFGC) NFPA
54/ANSI Z223.1 and the Installation Standards, Warm Air
Heating and Air Conditioning Systems ANSI/NFPA 90B
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 Installation (Manufactured
Home Sites, Communities, and Set-Ups),ANSI/NCS A225.1,
and/or CAN/CSA-Z240, MH Series Mobile Homes
CANADA: Current edition of National Standard of Canada,
Natural Gas and Propane Installation Code (NSCNGPIC)
CAN/CSA B149.1
General Installation
US: NFGC and the NFPA 90B. For copies, contact the National
Fire Protection Association Inc., Batterymarch Park, Quincy,
MA 02269; or for only the NFGC contact the American Gas
Association, 400 N. Capitol, N.W., Washington DC 20001
CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke
(Toronto), Ontario, M9W 1R3, Canada
Combustion and Ventilation Air
US: Section9.3 of the current edition of NFPA54/ANSI Z223.1
Air for Combustion and Ventilation
CANADA:Part 8 of the current edition of CAN/CSA B149.1,
Venting Systems and Air Supply for Appliances
Duct Systems
US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning Contractors
National Association (SMACNA), or American Society of Heating,
Refrigeration, and Air Conditioning Engineers (ASHRAE) 2005
Fundamentals Handbook Chapter 35
Acoustical Lining and Fibrous Glass Duct
US and CANADA: Current edition of SMACNA, NFPA 90B as
tested by UL Standard 181 for Class I Rigid Air Ducts
Gas Piping and Gas Pipe Pressure Testing
US: Current edition of NFPA 54/ANSI Z223.1 NFGC; Chapters
5, 6, 7, and 8 and national plumbing codes.
CANADA: Current edition of CAN/CSA
−
B149.1, Parts 4, 5, 6,
and 9.
In the state of Massachusetts:
This product must be installed by a licensed plumber or gas fitter.
When flexible connectors are used, the maximum length shall
not exceed 36 in. (914 mm).
When lever type gas shutoffs are used they shall be T
−
handle type.
The use of copper tubing for gas piping is not approved by the
state of Massachusetts.
Electrical Connections
US: Current edition of National Electrical Code (NEC) NFPA
70
PG92S*S
