NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
Index Page
SAFETY CONSIDERATIONS ................................................1-2
Clearances From Combustible Materials.................................1
Dimensional Drawing...............................................................2
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE........................................................................2-3
INTRODUCTION..........................................................................3
LOCATION ................................................................................3-4
General ......................................................................................3
Location Relative to Cooling Equipment ................................3
Hazardous Locations .............................................................3-4
AIR FOR COMBUSTION AND VENTILATION...................4-5
Unconfined Space.....................................................................4
Confined Space......................................................................4-5
SUPPLY-AIR PLENUM INSTALLATION (DOWNFLOW)..5-6
Installation On a Concrete Slab ...............................................5
Installation On a Combustible Floor ....................................5-6
HORIZONTAL ATTIC INSTALLATION...................................6
Construct a Working Platform .................................................6
Install Furnace...........................................................................6
HORIZONTAL CRAWLSPACE INSTALLATION....................6
FILTER ARRANGEMENT .......................................................6-7
GAS PIPING..................................................................................7
ELECTRICAL CONNECTIONS...............................................7-8
115-v Wiring.............................................................................8
24-v Wiring...............................................................................8
Accessories................................................................................8
VENTING ......................................................................................8
START-UP, ADJUSTMENT, AND SAFETY CHECK.........8-15
General.................................................................................8-10
Sequence Of Operation .....................................................10-12
Heating Mode..........................................................................10
Cooling Mode .........................................................................10
Continuous Blower Mode.......................................................10
Heat Pump Mode....................................................................10
Start-up Procedures............................................................10-12
Adjustments .......................................................................12-15
Set Gas Input Rate..................................................................12
Set Temperature Rise ........................................................13-14
Set Thermostat Heat Anticipator............................................14
Check Safety Controls.......................................................14-15
Checklist..................................................................................15
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person-
nel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in the literature, on tags,
and on labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA No.
54-1992/ANSI Z223.1-1992. In Canada, refer to the current
edition of the National Standard of Canada CAN/CGA-B149.1-
and .2-M91 Natural Gas and Propane Installation Codes (NSC-
NGPIC). Wear safety glasses and work gloves. Have fire extin-
guisher available during start-up and adjustment procedures and
service calls.
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CANADIAN GAS ASSOCIATION
APPROVED
R
TABLE 1—CLEARANCES FROM COMBUSTIBLE
MATERIALS (IN.)
UNIT SIZE 050 AND 070 095-135
DOWNFLOW (In Alcove or Closet)
Sides Single-Wall Vent 1 0
Type B-1 Double-Wall Vent 0 0
Back 00
Top 11
Front Single-Wall Vent 6† 6†
Type B-1 Double-Wall Vent 3† 3†
Vent Single-Wall Vent 6 6
Type B-1 Double-Wall Vent 1 1
HORIZONTAL (Attic, Alcove, or Crawlspace)
Sides * 10
Back 00
Top Single-Wall Vent 1 1
Type B-1 Double-Wall Vent 1 1
Front‡ Single-Wall Vent 6† 6†
Type B-1 Double-Wall Vent 3† 3†
Vent Single-Wall Vent 6 6
Type B-1 Double-Wall Vent 1 1
HORIZONTAL (In Closet)
Sides * 11
Back 00
Top Single-Wall Vent 2 2
Type B-1 Double-Wall Vent 2 2
Front Single-Wall Vent 6 6
Type B-1 Double-Wall Vent 3 3
Vent Single-Wall Vent 6 6
Type B-1 Double-Wall Vent 1 1
* Indicates supply or return sides when furnace is in the horizontal position.
† Clearance shown is for outlet end. The inlet end must maintain 6-in.
minimum clearance from the vent to combustible materials when using
single-wall vent.
‡ Minimum 18-in. front clearance required for alcove.
NOTES:
1. Provide 30-in. front clearance for servicing. An open door in front of the
furnace can meet this requirement.
2. A minimum clearance of 3 in. must be provided in front of the furnace for
combustion air and proper operation.
3. Line contact is permitted as shown in Fig. 7.
installation, startup,
and operating instructions
DOWNFLOW/HORIZONTAL
GAS-FIRED
INDUCED-COMBUSTION FURNACES
Cancels: II 373L-35-14 II 373L-35-15
7-15-95
373LAV
SERIES E
—1—
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