Form RZ-NA I-SCE, Mfg #207697 Rev 4, Page 1
INSTALLATION/OPERATION/MAINTENANCE
Form I-SCE (Version A)
Obsoletes Form RZ-NA I-SCE
Model SCE
Separated-Combustion
Packaged Furnace/Blower
NOTE: Model SCE units are not certified for residential use.
®
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in
open containers in the vicinity of this appliance is hazardous.
WARNING: Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, injury or death. Read the
installation, operation, and maintenance instructions thoroughly before
installing or servicing this equipment.
WARNING: Gas-fired appliances are not designed for use in hazardous
atmospheres containing flammable vapors or combustible dust, in
atmospheres containing chlorinated or halogenated hydrocarbons, or in
applications with airborne silicone substances. See Hazard Levels, page
2.
GENERAL
The instructions in this manual apply to
Model SCE blower-type unit heater with
blower cabinet.
Installation should be done by a qualified
agency in accordance with the instructions
in this manual and in compliance with all
codes and requirements of authorities hav-
ing jurisdiction.
Model SCE is design-certified by the Canadian Standards Association to ANSI Standards
and approved to CSA Standards. Model SCE is available for use with either natural or
propane gas. The type of gas, the firing rate, and the electrical characteristics are on the unit
rating plate.
This separated combustion unit is designed and manufactured in accordance with the ANSI
definition of separated combustion. That definition reads, "Separated Combustion System
Appliance: A system consisting of an appliance and a vent cap(s) supplied by the manufac-
turer, and (1) combustion air connections between the appliance and the outside atmo-
sphere, and (2) flue gas connections between the appliance and vent cap, of a type(s)
specified by the manufacturer but supplied by the installer, constructed so that, when in-
stalled in accordance with the manufacturer's instructions, air for combustion is obtained
from the outside atmosphere and flue gases are discharged to the outside atmosphere."
Separated combustion units are designed to separate air for combustion and flue products
from the environment of the building in which the unit is installed. Separated combustion
TABLE OF CONTENTS
Pages
Installation/Operation .............. 1-30
Check Installation & Startup 30-31
Optional Equipment ................ 32-33
Service/Maintenance ............... 33-36
INDEX by Page No.
Belts ......................................................... 24
Blower ...................................................... 24
Blower Rotation ....................................... 24
Adjusting Blower Speed .......................... 24
Burner Air Shutters .................................. 30
Burner Carryover Systems ........................ 29
Burner Orifices ......................................... 29
Burner Rack Removal .............................. 34
Burners ..................................................... 29
Check Installation & Startup ................... 30
Cleaning the Heat Exchanger ................... 35
Cleaning Pilot and Burners ..................... 34
Clearances .................................................. 4
Combustion Air .......................................... 7
Concentric Adapter Box ............................ 10
Optional Condensation Drain .................... 6
Optional Dampers & Controls .................. 32
Dimensions ................................................ 3
Dirty Filter Switch (Option) .................... 33
Drives ........................................................ 24
Duct Connections ...................................... 6
Ductstat (Optional) ................................... 25
Electrical Supply & Connections ............ 20
Optional Electronic Modulation .............. 26
Fan Control ............................................. 23
Filter Rack & Filters ................................ 32
Gas Piping and Pressures ......................... 18
Gas Valve ............................................ 24, 33
General ....................................................... 1
HAZARD INTENSITY LEVELS ............. 2
Horizontal Vent Terminal/
Combustion Air Inlet .......................... 12
Ignition System ....................................... 29
Installation Codes ...................................... 2
Limit Control .......................................... 23
Limit Control Check ............................... 35
MAINTENANCE .................................... 33
Manifold Pressure Setting ........................ 19
Motor ........................................................ 23
Mounting ................................................... 5
Optional Accessories ................................. 32
Pilot and Ignition Systems ...................... 29
SERVICE ................................................. 33
Startup ..................................................... 30
Support ....................................................... 9
Suspension ................................................. 5
Thermostat ............................................... 20
Troubleshooting ...................................... 35
Optional Two-Stage Operation ................ 24
Uncrating ................................................... 3
Valve ........................................................ 24
Vent/Combustion Air System ............... 7, 33
Venting .................................................. 7-17
Vertical Vent Terminal/
Combustion Air Inlet .......................... 15
Warranty ..................................................... 2
Wiring Diagram .................................. 21-22
REFERENCE
Replacement Parts ....................... Form P-SC
Gas Conversion.......................... Form P-GC
Front View
Rear View
Model Description
SCE
Separated-Combustion, Blower-Type
Unit Heater with Blower Cabinet
