Thomas & Betts Reznor SCE Installation Operation & Maintenance

Separated-combustion packaged furnace/blower

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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

Pages

If you smell gas:

1. Open windows.

2. Don't touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

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

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

Separated-Combustion

Packaged Furnace/Blower

NOTE: Model SCE units are not certified for residential use.

INSTALLATION/OPERATION/MAINTENANCE

FOR YOUR SAFETY

Model Description

Sep arated-Combustion, Blower-Ty p e

SCE

Unit Heater with Blower Cabinet

Front View

Form RZ-NA I-SCE, Mfg #207697 Rev 4, Page 1

Model SCE

Form I-SCE (Version A)

Obsoletes Form RZ-NA I-SCE

Rear View

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Summary of Contents for Thomas & Betts Reznor SCE

Page 1 Model SCE Separated-Combustion Packaged Furnace/Blower NOTE: Model SCE units are not certified for residential use. INSTALLATION/OPERATION/MAINTENANCE Form I-SCE (Version A) ® Obsoletes Form RZ-NA I-SCE TABLE OF CONTENTS Pages FOR YOUR SAFETY Installation/Operation ....1-30 If you smell gas: Check Installation & Startup 30-31 Optional Equipment ....
Page 2: Hazard Intensity Levels
General (cont'd) appliances are recommended for use in dust laden and some corrosive fume environments or in buildings with negative pressure (up to .15" w.c.). As the definition states, all separated combustion, power-vented equipment must be equipped with both combustion air and ex- haust piping to the outdoors.
Page 3: Dimensions
3. Dimensions FIGURE 1 - Model SCE Dimensions - inches ±1/8 (mm ±3) (4) Mounting Sockets, 6-3/32” 1” IPS free turning 2-13/16” 4-9/16” 7-1/2” 155mm female pipe thread 116mm Standard 71mm 2” 191mm Combustion Products 3/4” 51mm Discharge 6” (150mm) O.D. Model 19mm Electrical...
Page 4: Clearances
4. Uncrating (cont'd) To protect the unit during shipping, blower models have special supports that must be removed before installation. Follow these instructions to remove: Blower Support Legs - Remove the blower support legs and screws. Motor Shipping Block - Remove the wooden block located under the motor bracket. Find the two rubber pads shipped in the instruction envelope.
Page 5: Mounting
6. Suspension and Before installing, check the supporting structure to be sure that it has sufficient load-carry- ing capacity to support the weight. Mounting Net Weight (lbs and kg) Size 150-175 200-225 250-300 Weights Suspension Model SCE has four-point suspension. See hanger centerline dimensions in FIGURE 1, Paragraph 3.
Page 6: Duct Connections
7. Optional Model SCE furnaces are certified for installation upstream or downstream from a cooling coil. When installed downstream from a refrigeration system, condensation will form; and there- Condensation fore, adequate provision must be made to dispose of condensate. Drain for Duct Periodic cleaning of the condensate collection and disposal system is required.
Page 7: Combustion Air
CAUTION: Joint where supply air duct attaches to the furnace must be sealed securely to prevent air leakage into drafthood or burner rack area. Leakage can cause poor combustion, pilot problems, shorten heat exchanger life, and cause poor performance. See Hazard levels, page 2.
Page 8: Combustion Air
9. Venting and Specific Venting Requirements Combustion Air All pipe is field supplied. Requirements are listed for both the vent pipe and the combustion (cont'd) air inlet pipe. • Vent pipe approved for a Category III appliance OR single-wall, 26-gauge or heavier 1) Type of Pipe galvanized (or a material of equivalent durability and corrosion resistance) vent pipe is required between the heater and the concentric adapter box.
Page 9: Support
• To seal joints in the single-wall combustion air pipe, secure slip fit pipe connections using sheetmetal screws or rivets. Seal all joints with aluminum tape or silicone sealant. • To seal joint in the terminal section of double-wall vent pipe (allowed ONLY ABOVE the concentric pipes on a VERTICAL vent, follow the pipe manufacturer’s instructions for joining and sealing double-wall vent pipe sections.
Page 10: Concentric Adapter Box
9. Venting and Combustion Air (cont'd) Specific Venting Requirements (cont'd) 6) Clearance Do not enclose the vent pipe or place pipe closer than 6" (152mm) to combustible material. 7) Concentric All separated combustion installations require a concentric adapter box as illustrated in FIGURE 10. The concentric adapter box is included in the vent/combustion air kit.
Page 11 Pipe Connections at When pipe diameters differ, depending on direction of airflow, join the pipes with either a taper- type reducer or enlarger. Refer to illustrations in FIGURE 11 for pipe connection requirements at the Concentric the concentric adapter box. Adapter Box Do NOT make actual connections until after reading the instructions and length requirements for installing the vent/combustion air kit.
Page 12: Installation Instructions
HORIZONTAL VENT Qty P/N Description INSTRUCTIONS 205883 Complete Horizontal Vent Kit (Same as Option CC6) 205885 Concentric Adapter Box Assembly (See FIGURE 10, page 10.) Components Required - 53316 Screened Exhaust Assembly (illustrated below) Factory and Field 205894 Inlet Guard (illustrated below) 37661 #10-16 x 1/2"...
Page 13 HORIZONTAL VENT 3. Prepare a hole through the outside wall for the 8" (203mm) diameter combustion air pipe. Outside wall construction thickness should be between 1" (25mm) minimum and 48" INSTRUCTIONS (1143mm) maximum. The larger diameter combustion air pipe serves as clearance for the (cont’d) vent pipe on non-combustible construction.
Page 14 HORIZONTAL VENT completely. INSTRUCTIONS 10. Attach the indoor combustion air pipe. If using 6" pipes, attach the single-wall combus- tion air pipe run to the collar on the concentric adapter box with sheetmetal screws. If using (cont’d) 7” pipe on Sizes 200-400, install a taper type enlarger as illustrated In FIGURE 11, page 11. Seal joints with tape or sealant.
Page 15 VERTICAL VENT Description INSTRUCTIONS 205896 Complete Vertical Vent Kit (Same as Option CC2) 205885 Concentric Adapter Box Assembly (See FIGURE 10, page 10) Components 53326 Exhaust (Vent) Terminal (illustrated below) Required - Factory 53330 Combustion Air (illustrated below) 207232 Brackets for attaching Concentric Adapter Box (See FIGURE 14, below.) and Field 53335 Tube of High Temperature Silicone Sealant...
Page 16 VERTICAL VENT b). Attach the outside portion of the combustion air pipe to the box. Determine the length of the combustion air pipe so that dimension ”X” in FIGURE 15 is equal to the bracket length, INSTRUCTIONS (cont’d) plus the roof thickness, plus anticipated snow depth, but does not exceed 48“ (1219mm) or FIGURE 15 - Assemble have less than 18”...
Page 17 7. On the outside, slide the combustion air inlet FIGURE 17 - Install Combustion Air Inlet and Vent Terminal over the vent pipe and fasten the collar to the combustion air pipe with sheetmetal screws. See SECOND, Install the Exhaust (Vent) Terminal. FIGURE 17.
Page 18: Gas Piping And Pressures
10. Gas Piping and WARNING Pressures This appliance is equipped for a maximum gas supply pressure of 1/2 psi, 3.5 kPa, or 14 inches water column. NOTE: Supply pressures higher than 1/2 psi require installation of an addi- tional service regulator external to the unit. Pressure Testing Supply Piping Test Pressure Above 1/2 PSI: Disconnect the heater and manual valve from the gas supply which is to be pressure tested.
Page 19 Sizing Gas Supply Lines Capacity of Piping Cubic Feet per Hour based on 0.3" w.c. Pressure Drop Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft) Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft) Length Diameter of Pipe 1/2"...
Page 20: Electrical Supply
11. Electrical Supply All electrical wiring and connections including electrical grounding must be made in accor- dance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in Canada, the and Connections Canadian Electrical Code, Part I-CSA. Standard C22.l. Check any local ordinances or gas company requirements that apply.
Page 21 Typical Wiring Diagrams FIGURE 20 - W. D. 225711, Model SCE with Single-Stage Gas Control DISCONNECT SWITCH BLOWER MOTOR (SEE NOTE) WIRING CODE CONTACTOR CONTACTS BLACK - BK INTERNALLY BROWN - BR PROTECTED R OR BK BLOWER RED - R MOTOR ORANGE - O YELLOW - Y...
Page 22 Typical Wiring Diagrams (cont'd) FIGURE 21 - W. D. 225636, Model SCE with Two-Stage Gas Control DISCONNECT SWITCH BLOWER MOTOR (SEE NOTES) CONTACTOR CONTACTS WIRING CODE INTERNALLY PROTECTED BLACK - BK R OR BK BLOWER MOTOR BROWN - BR RED - R ORANGE - O YELLOW - Y R OR W...
Page 23: Fan Control
13. Combustion Air The combustion air proving switch ensures that proper combustion airflow is available. The switch is a single-pole, double-throw switch, which senses pressure caused by the flow of Proving Switch combustion air from the venter. The switch is designed to close when a decreasing pressure is sensed in the outlet duct of the gas collection box.
Page 24: Belts
17. Blowers, Belts Check belt tension. Proper belt tension is important to the long life of the belt and motor. A loose belt will cause wear and slippage. Too much tension will cause excessive motor and and Drives blower bearing wear. Adjust the belt tension by turning the adjusting screw on the motor FIGURE 22 - Check Belt base until the belt can be depressed 3/4"...
Page 25 18. Operating All furnaces are equipped with a 24-volt combination valve which includes the automatic electric on-off valve controlled by the room thermostat, the pressure regulator, the safety pilot valve, and Valve the manual shutoff valve. The standard gas valve allows for single-stage control from a single- stage, 24-volt thermostat.
Page 26: Optional Electronic Modulation
20. Optional 2- FIGURE 25 - (A) Remote Temperature Selector, Stage (B) Stage-Adder Module, Operation - and (C) Optional Display Makeup Air Module for Ductstat in Two-Stage Makeup Air Application Control Options (Option (cont'd) AG15 or AG16) The type and capability of the electronic modulation system, depends on the option selected. 21.
Page 27 The gas train includes a single-stage gas valve, a modulating valve, and two gas pressure switches. The burner rack is equipped with one flash carryover and a regulated gas lighter tube system. The carryover lighter tube receives its gas supply through the regulator, simultaneously with the gas to the burner.
Page 28 21D. Computer tioner accepts a 4-20 milliamp signal. In the "off" positions, the conditioner accepts a 0-10V Controlled signal. The conditioner converts the signal to the 0 to 20 volt DC current required to control the modulating valve. The heater functions and is equipped in the same way as described in Para- Electronic graph 21C (Option AG39) except that with computer control the temperatures are selected through Modulation...
Page 29: Burner Carryover Systems
22. Pilot and Ignition System Ignition Natural gas units are equipped with a spark ignited intermittent safety pilot system that shuts off the pilot gas flow between heat cycles. Propane units (or as an option on natural gas units) Systems require a lockout device that stops the gas flow to the pilot if the pilot fails to light in 120 seconds.
Page 30: Check Installation & Startup
23. Burner Model SCE Size Burner Orifices Orifices Drill S ize (cont'd) Natural Gas 84437 11833 84437 11828 84437 11833 84437 84437 84437 Drill S ize 1.45 mm 1.45 mm 1.45 mm 1.45 mm 1.45 mm 1.45 mm Propane Gas 61652 11830 61652...
Page 31 Operating Sequence 1. Set the thermostat switch at its lowest setting. 2. Turn on power. 3. Turn on the manual gas valves. 4. Set thermostat at desired setting. 5. Thermostat calls for heat (a) The venter motor is energized after 15-second (approximate) time delay. (b) Venter flow switches from N.C.
Page 32: Optional Equipment
OPTIONAL EQUIPMENT 26. Optional Dampers and Controls (See Wiring Diagram supplied with unit) FIGURE 31 - Control Locations for Air Inlet/Damper Options Outside Air Damper CLOSED Outside Rod for Outside Air Damper Damper Rod for Return Air Damper Damper Linkage -- When units are equipped Set Screw with dampers, the dampers...
Page 33: Maintenance
Instructions for With clean filters in place, blower doors closed, and blower in operation, decrease the pressure setting by adjusting the set screw on the switch clockwise until the filter light is energized or the Setting Dirty Filter screw is bottomed out. At that point, adjust the set screw three full turns counterclockwise or Switch until the screw is top-ended.
Page 34: Burner Rack Removal
29. Vent/Combustion Check at least once a year. Inspect all joints, seams and terminal caps. Replace any defective parts. Air System 30. Burner Rack Burner Rack Removal Instructions 1. Turn off the gas supply. 2. Turn off the electric supply. 3.
Page 35: Limit Control
FIGURE 35 - Pilot Side Assembly Spark Gap View View If the main gas valve fails to open with a normal full size pilot flame established, check for the following: a) If voltage between black and brown leads on the main gas valve is 20 to 32 VAC and there is no main gas flow with the built-in manual valve in FULL OPEN position, the main valve is defective.
Page 36 37. Troubleshooting (cont'd) TROUBLE (cont'd) PROBABLE CAUS E (cont'd) REMEDY (cont'd) Pilot lights, main 1. M anual valve not open. 1. Open manual valve. valve will not open 2. M ain valve not operating. a) Defective valve. a) If 24 volt is measured at valve connections and valve remains closed, replace valve.

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