Thomas & Betts FE, BE User Manual

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Installation and Operation ......................... Par . 1-23 .........Pages 1-18

Check Installation and Start-Up ................. Par . 24 .............. Page 19

Optional Equipment ..................................Par . 25-31 ....... Pages 20-22

Service/Maintenance/Troubleshooting.....Par. 32-42 ....... Pages 23-28

Index by Page

Belt Tension ............................................... 16

Blower/Filter Cabinet (Optional) ...................22

Blower Motor ............................................ 16

Blower Rotation ........................................ 17

Blower Speed Adjustment ......................... 17

Bottom Access ........................................... 23

Burners ................................................ 18, 23

Burner Air Adjustment .............................. 18

Burner Rack Removal ............................... 23

Carryover, Flash ........................................ 25

Check Installation and Start-Up ................ 19

Clearances.................................................... 5

Combustion Air Proving Switch ............... 1 8

Combustion Air ....................................... 5, 6

Confined Space Installation......................... 6

Dimensional Drawings ................................ 3

Disconnect Switch (Optional) ................... 11

Duct Flange (Blower Model Option) ........ 20

INSTALLATION FORM RGM 436 (Version A)

APPLIES TO: Installation/Operation/Service

Table of Contents

Electrical Supply and Connections............ 11

Fan Blade................................................... 25

Fan Control.......................................... 17, 26

Fan Motor .................................................. 16

Gas Piping and Pressures .......................... 10

Guard Options (Blower Model) ................ 22

Hanger Kits (Optional) ................................ 7

Hazard Intensity Levels ............................... 2

Heat Exchanger ......................................... 25

Ignition System.................................... 18, 24

Installation Codes ........................................ 2

Limit Control ....................................... 17, 26

Locating the Heater ..................................... 5

Louvers, Vertical (Optional)...................... 20

Maintenance .............................................. 23

Maintenance Schedule............................... 23

Multiple Heater Control Option ................ 22

Model FE and BE

Gas-Fired, Power-Vented

Unit Heaters

Obsoletes 436-5

Nozzles, Downturn Air (Optional) ............ 20

Optional Equipment .................................. 20

Operating Sequence................................... 19

Orifices, Burner and Pilot.......................... 25

Pilot ..................................................... 18, 24

Polytube Adapter

Service ....................................................... 23

Spark Gap .................................................. 24

Suspending the Unit .................................... 6

Thermostats ............................................... 11

Troubleshooting......................................... 2 7

Uncrating and Preparation........................... 5

Valve, Gas............................................ 18, 26

Venter Motor and Relay ............................ 26

Venting ................................................... 7, 26

Warranty ...................................................... 2

Wiring Diagrams ................................12-15

(Blower Model Option) ..... 21

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.

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.

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.

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.

GENERAL

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 having jurisdiction. The instructions in this manual apply to the unit heater models shown on the right.

Model F u el Vent Air Delivery

G as-Fired Power Propeller Fan

Centrifugal Blower (heater

Gas -Fired Po wer

may be attached to ductwor k)

Mfg P/N 98807 Rev 8, Page 1

HAZARD INTENSITY LEVELS

1. DANGER: Failure to comply will result in severe personal injury or death and/or property damage.

2. WARNING: Failure to comply could result in severe personal injury or death and/or property damage.

3. CAUTION: Failure to comply could result in minor personal injury and/or property damage.

1. Installation Codes

The gas-fired unit heaters covered in this manual are design-certified by the American Gas Association and approved by the Canadian Gas Association for use with either natural or propane gas. The type of gas for which your heater is equipped and the correct firing rate are shown on the rating plate attached to your unit. Electrical characteristics are shown on the motor nameplate and on the unit rating plate.

These units must be installed in accordance with local building codes. In the absence of local codes, in the United States, the unit must be installed in accordance with the National Fuel Gas Code (latest edition). A Canadian installation must be in accordance with the CAN/ CGA B149.1 and B149.2 Installation Code for Gas Burning Appliances and Equipment. These codes are available from CSA Information Services, 1-800-463-6727. Local authorities having jurisdiction should be consulted before installation to verify local codes and installation procedure requirements.

Clearances from the heater and vent to combustible construction or material in storage must conform with the National Fuel Gas Code ANSI Z223.1a (latest edition) pertaining to gas-burning devices, and such material must not attain a temperature over 160oF by continued operation of the heater.

Special Installations (Aircraft Hangars/ Garages)

Installations in aircraft hangars should be in accordance with ANSI/ NFPA No. 409 (latest edition), Standard for Aircraft Hangars; in public garages in accordance with ANSI/NFPA No. 88A (latest edition), Standard for Parking Structures; and for repair garages in accordance with ANSI/NFPA No. 88B (latest edition), Standard for Repair Garages. ANSI/NFP A-88 (latest edition) specifies overhead heaters must be installed at least eight feet above the floor. In Canada, installations in aircraft hangars should be in accordance with the requirements of the enforcing authorities, and in public garages in accordance with CAN/ CGA B149 codes.

ANSI/NFP A 409 (latest edition) specifies a clearance of ten feet to the bottom of the heater from the highest surface of the top of the wing or engine enclosure of whatever aircraft would be the highest to be housed in the hangar, and a minimum clearance of eight feet from the floor in other sections of aircraft hangars, such as the offices, and shops which communicate with areas used for servicing or storage. The heaters must be located so as to be protected from damage by aircraft or other objects such as cranes and movable scaffolding. In addition, the heaters must be located so as to be accessible for servicing, adjustment, etc.

2. Warranty

Refer to limited warranty information on the warranty card in the "Owner's Envelope".

WARRANTY: Warranty is void if......

a. Unit Heaters are used in atmospheres containing flammable

vapors or atmospheres containing chlorinated or halogenated hydrocarbons or airborne silicone substances.

b. Wiring is not in accordance with the diagram furnished with

the heater .

c. Unit is installed without proper clearances to combustible ma-

terials or located in a confined space without proper ventilation and air for combustion. (See Paragraphs 6 and 7.)

d. Fan-type unit heater is connected to a duct system.

Form 436, Page 2

3. Dimensions

Fan-Type, Power-Vented Unit Heater

Dimensions (inches)

SizeABCDEFGHJKLMN

Nat Pro

29-25/32 13-9/16 27-1/16 31-7/ 16 5-27/32 14- 7/16 14-1/32 4 10-9/32 16 1/2 1/2 9-13/16 3

29-25/32 15-9/16 27-1/16 31-7/ 16 5-27/32 14- 7/16 14-1/32 4 10-17/ 3 2 16 1/2 1/2 10-7/16 3

29-25/32 17-9/16 30-7/16 31-7/ 16 5-27/32 14- 7/16 14-1/32 4 12-29/ 3 2 16 1/2 1/2 10-7/16 3

100

29-25/32 23-5/16 30-7/16 31-7/ 16 5-27/32 14- 7/16 14-1/32 5 14-7/16 16 1/2 1/2 11-9/16 2-5/8

125

39-15/16 20-5/16 35-7/16 35-15/ 1 6 4-7/8 19-15/32 15-23/32 5 14-9/32 24 1/2 1/2 11-11/16 4- 1 9/32

165

39-15/16 23-5/16 36-3/16 35-15/ 1 6 4-7/8 19-15/32 15-23/32 5 14-13/32 24 1/2 1/2 11-11/16 4-19/ 32

200

39-15/16 28-13/ 1 6 36-3/16 35-15/1 6 4-7/8 19-15/32 15-23/32 5 12-11/ 32 24 1/2 1/2 11-11/16 4-19/ 32

250

39-15/16 28-13/ 1 6 36- 11/16 35-15/ 1 6 4-7/8 19-15/32 15-23/32 6 12-11/32 24 3/4 1/2 11-11/16 3-19/ 32

300

39-15/16 37-1/16 37-5/16 35-15/ 1 6 4-7/8 19-15/32 15-23/32 6 13 24 3/4 1/ 2 11-11/16 3-19/32

400

Dimensions (mm)

SizeABCDEFGHJKLMN

Nat Pro

25 50

75 100 125 165 200 250 300 400

756 344 687 799 148 367 356 102 261 406 13 13 249 76 756 344 687 799 148 367 356 102 261 406 13 13 249 76 756 395 687 799 148 367 356 102 267 406 13 13 265 76 756 446 773 799 148 367 356 102 328 406 13 13 265 76 756 592 773 799 148 367 356 127 367 406 13 13 294 67

1014 516 900 913 124 498 399 127 363 610 13 13 297 117

756 592 919 913 124 498 399 127 366 610 13 13 297 117 756 732 919 913 124 498 399 127 314 610 13 13 297 117 756 732 932 913 124 498 399 152 314 610 19 13 297 91 756 941 948 913 124 498 399 152 330 610 19 13 297 91

Suspension Notes: Use Dimension "G" for two-point suspension and "E" and "F" for four-

point suspension. (Two-point suspension is standard; four-point is optional. Four-point suspension is available either factory or field installed.)

Mfg P/N 98807 Rev 8, Page 3

3. Dimensions (cont'd)

Blower-Type, Power-Vented Unit Heater

Dimensions (inches)

Size

25 50

75 100 125 165 200 250 300 400

Size

75 100 125 165 200 250 300 400

Dimensions (mm)

Size

75 100 125 165 200 250 300 400

Form 436, Page 4

ABCDEF



29-25/32 13-9/16 43-3/8 31-7/16 5-27/32 14-7/16 61-3/8 4 10-9/32 16 1/2 1/2 29-25/32 13-9/16 50 31-7/16 5-27/32 14 -7/16 61-3/8 4 10-9/32 16 1/2 1/2 29-25/32 15-9/16 50 31-7/16 5-27/32 14 -7/16 61-3/8 4 10-17/32 16 1/2 1/2 29-25/32 17-9/16 50 31-7/16 5-27/32 14 -7/16 61-3/8 4 12-29/32 16 1/2 1/2 29-25/32 23-5/16 47-1/2 31-7/16 5-27/32 14-7/16 65-29/32 5 14-7/16 16 1/2 1/2 39-15/16 20-5/16 61 35-15/16 4-7/8 19-15/32 76-1/8 5 14-9/32 24 1/2 1/2 39-15/16 23-5/16 66-1/2 35-15/16 4-7/8 19-15/32 76-1/8 5 14-13/32 24 1/2 1/2 39-15/16 28-13/16 66-1/2 35-15/16 4-7/8 19-15/32 76-1/8 5 12-11/32 24 1/2 1/2 39-15/16 28-13/16 66-1/2 35-15/16 4-7/8 19-15/32 76-1/8 6 12-11/32 24 3/4 1/2 39-15/16 37-1/16 66-1/2 35-15/16 4-7/8 19-15/32 76-1/8 6 13 24 3/4 1/2

MNPRST U W

  

3-23/32 20-15/16 17-3/4 5-1/4 10-3/4 8-7/16 14-3/4 6-3/16 31-7/32 9-13/16 3 3-23/32 20-15/16 17-3/4 5-1/4 10-3/4 8-7/16 14-3/4 6-3/16 31-7/32 9-13/16 3 2-23/32 20-15/16 17-3/4 5-1/4 12-3/4 8-7/16 14-3/4 6-3/16 31-7/32 10-7/16 3 1-23/32 20-15/16 17-3/4 5-1/4 14-3/4 8-7/16 14-3/4 6-3/16 31-7/32 10-7/16 3 1-11/32 20-15/16 17-3/4 5-1/4 20-1/2 8-7/16 20-1/2 6-3/16 35-3/4 11-9/16 2-5/8 2-27/32 25-15/16 25-1/4 7-1/4 17-1/2 11-7/16 20-1/2 7-15/16 36-11/16 11-11/1 6 4-19/32 1-11/32 25-15/16 25-1/4 7-1/4 20-1/2 11-7/16 20-1/2 7-15/16 36-11/16 11-11/1 6 4-19/32 5-29/32 40-9/16 25-1/4 7-1/4 26 11-7/16 26 7-15/16 36-11/16 11-11/16 4-19/32 5-29/32 40-9/16 25-1/4 7-1/4 26 11-7/16 26 7-15/16 36-11/16 11-11/16 3-19/32 6-25/32 50-9/16 25-1/4 7-1/4 34-1/4 11-7/16 34-1/4 7-15/16 36-11/16 11-11/16 3-19/32

ABCDEF



756 344 1102 799 148 367 1559 102 261 406 13 13 756 344 1270 799 148 367 1559 102 261 406 13 13 756 395 1270 799 148 367 1559 102 267 406 13 13 756 446 1270 799 148 367 1559 102 328 406 13 13

756 592 1207 799 148 367 1674 127 367 406 13 13 1014 516 1549 913 124 495 1934 127 363 610 13 13 1014 592 1689 913 124 495 1934 127 366 610 13 13 1014 732 1689 913 124 495 1934 127 314 610 13 13 1014 732 1689 913 124 495 1934 152 314 610 19 13 1014 914 1689 913 124 495 1934 152 330 610 19 13



Hanger



Hanger

GH J K L

 



XYZ

Nat Pro

Hanger

GH J K L

   

Nat Pro

Size

25 50

75 100 125 165 200 250 300 400

MNPRST U W



      

94 532 48 1 133 273 214 375 157 793 249 76 94 532 48 1 133 273 214 375 157 793 249 76 69 532 48 1 133 324 214 375 157 793 265 76 44 532 48 1 133 375 214 375 157 793 265 76 34 532 48 1 133 521 214 521 157 908 294 67 72 659 64 1 184 445 291 521 202 932 297 11 7

34 659 64 1 184 521 291 521 202 932 297 11 7 150 1030 641 184 660 291 660 202 932 297 117 150 1030 641 184 660 291 660 202 932 297 91 172 1284 641 184 870 291 870 202 932 297 91

XYZ

Hanger

When equipped with optional blower cabinet. When equipped with optional duct flange. Dimension includes a 3/4" flange on the rear of the blower

cabinet.

NOTES

Use with 4-point suspension without blower cabinet. If installing hanger kit Option CK19, suspension points change; see Paragraph 8.

4. Uncrating and Preparation

This unit was test operated and inspected at the factory prior to crating and was in operating condition. If the heater has incurred any damage in shipment, file a claim with the transporting agency. Check the rating plate for the gas specifications and electrical characteristics of the heater to be sure that they are compatible with the gas and electric supplies at the installation site. Read this booklet and become familiar with the installation requirements of your particular heater. If you do not have knowledge of local requirements, check with the local gas company or any other local agencies who might have requirements concerning this installation. Before beginning, make preparations for necessary supplies, tools, and manpower. Check to see if there are any field-installed options that need to be assembled to the heater prior to installation. Each of the option packages includes a list of components and step-by-step instructions. For a brief description of optional hanger kits, refer to Paragraph 8. For a brief explanation of other frequently specified field-installed options, see Paragraphs 25-31. After becoming familiar with the instructions, assemble and install the options that are required for your heater. If the heater was ordered with a vent cap shipped with the heater (Option BT2), packaging depends on the size of the heater. Sizes 25 and 50 have the vent cap mounted on a shipping tube that is attached to the venter housing. Remove the vent cap; remove and discard the shipping tube. Sizes 100, 165, 200, 250, 300 and 400 have the vent cap attached directly to the venter housing. Size 125 is shipped with the vent cap mounted on the crate near the gas valve. Remove the vent cap for field installation at the vent terminal. Unless the crate bottom has been removed for option installation, leave it attached until after the heater has been suspended. If the crate bottom has been removed, the bottom of the heater must be supported with plywood or appropriately placed boards. Without adequate support, the bottom access panel could be damaged. To protect the unit during shipping, the blower model has special supports that must be removed before installation. Follow these instructions to remove: oBlower Support Legs -- Remove the two blower support legs and

screws.

oMotor Shipping Block - Remove the wooden block located under

the motor bracket. Find the two rubber pads shipped in the instruction envelope. Place these pads on the ends of the motor bracket bolts.

Use with 4-point suspension with blower cabinet. Contactor is standard on Models 300 and 400; optional on other

sizes. Contactor location with optional three phase motors on Sizes 50, 75, 100 and 125. Deduct 6-5/8" on Sizes 50, 75, and 100 when equipped with direct drive motor.

oMotor Shipping Plate -- Blower models that are equipped with motors

of 3/4 HP or less have a metal shipping plate attached between the motor and the blower housing. Remove and discard the shipping plate. Note: On units factory equipped with an optional belt guard, the belt guard must be removed in order to reach the shipping plate.

5. Unit Heater Location

CAUTION: A void installing a unit heater in extremely drafty areas. Extreme drafts can shorten the life of the heat exchanger and/or cause safety problems.

For best results, the heater should be placed with certain rules in mind. In general, a unit should be located from 8 to 12 feet above the floor. Units should always be arranged to blow toward or along exposed wall surfaces, if possible. Where two or more units are installed in the same room, a general scheme of air circulation should be maintained for best results.

Suspended heaters are most effective when located as close to the working zone as possible, and this fact should be kept in mind when determining the mounting heights to be used. However, care should be exercised to avoid directing the discharged air directly on the room occupants. Partitions, columns, counters, or other obstructions should be taken into consideration when locating the unit heater so that a minimum quantity of airflow will be deflected by such obstacles. When units are located in the center of the space to be heated, the air should be discharged toward the exposed walls. In large areas, units should be located to discharge air along exposed walls with extra units provided to discharge air in toward the center of the area. At those points where infiltration of cold air is excessive, such as at entrance doors and shipping doors, it is desirable to locate the unit so that it will discharge directly toward the source of cold air from a distance of 15 to 20 feet. Units should not be installed closer than 18 inches from any wall.

CAUTION: Do not locate the heater where it may be exposed to water spray, rain or dripping water.

6. Clearances & Combustion Air

Units must be installed so that the following clearances are provided for combustion air space, service and inspection, and for proper spacing from combustible construction.

Mfg P/N 98807 Rev 8, Page 5

6. Clearances and Combustion Air (cont'd)

Model Required Clearances (inches and mm) Size Top Flue Sides Bottom Rear

Collector

25-400 6"(152) 6"(152) 18"(457) 12"(305) * 24" (610)**

* When supplied with optional downturn nozzle, bottom clearance is

42"(1067mm). For service purposes, on standard units, bottom clearance exceeding minimum (12" or 305mm) is not required but may be desirable.

** For servicing purposes only, rear must remain full open. All fuel-burning equipment must be supplied with the air that enters

into the combustion process and is then vented to the outdoors. Sufficient air must enter the equipment location to replace that exhausted through the heater vent system. In the past, the infiltration of outside air assumed in heat loss calculations (one air change per hour) was assumed to be sufficient. However, current construction methods utilizing more insulation, vapor barriers, tighter fitting and gasketed doors and windows or weather-stripping, and mechanical exhaust fans may now require the introduction of outside air through wall openings or ducts.

The requirements for combustion and ventilation air depend upon whether the unit is located in a confined or unconfined space. An "unconfined space" is defined as a space whose volume is not less than 50 cubic feet per 1000 BTUH of the installed appliance. Under all condi- tions, enough air must be provided to ensure there will not be a negative pressure condition within the equipment room or space. For specific requirements for confined space installation, see Paragraph 7.

W ARNING: These power-vented unit heaters ar e designed to take combustion air from the space in which the unit is installed and are not designed for connection to outside combustion air intake ducts. Connecting outside air ducts voids the warranty and could cause hazardous operation. See Hazard Levels, Page 2.

7. Combustion Air Requirements for a Heater Located in a Confined Space

Do not install a unit in a confined space without providing wall openings leading to and from the space. Provide openings near the floor and ceiling for ventilation and air for combustion as shown in Figure 1, depending on the combustion air source as noted in Items 1, 2, and 3 below the illustration.

Figure 1 Confined Space: A space whose volume is less than 50 cubic feet per 1000 BTUH of the installed appliance input rating

Add total BTUH of all appliances in the confined space and divide by figures below for square inch free area size of each (top and bottom) opening.

1. Air from inside the building -- openings 1 square inch free area per 1000 BTUH. Never less than 100 square inches free area for each opening. See (1) in Figure 1.

2. Air from outside through duct -- openings 1 square inch free area per 2000 BTUH. See (2) in Figure 1.

3. Air direct from outside -- openings 1 square inch free area per 4000 BTUH. See (3) in Figure 1.

NOTE: For further details on supplying combustion air to a confined space, see the National Fuel Gas Code ANSI Z223.1a (latest edition ).

8. Suspending the Heater

Before suspending the heater, check the supporting structure to be used to verify that it has sufficient load-carrying capacity to support the weight of the unit.

Net Weight (lbs and kg) Model Size Type 25 50 75 100 125 165 200 250 300 400

Fan lbs 76 83 92 101 132 154 175 209 226 281

kg 34 38 42 46 60 70 79 95 103 127

Blower lbs 97 104 118 130 180 206 240 278 301 395

kg 44 47 54 59 82 93 109 126 137 179

NOTE: If the installation includes an optional stepdown transformer kit (Option CF or CG), the stepdown transformer bracket is part of the heater suspension and must be installed prior to hanging the heater. Follow the instructions on the installation sheet included with the option kit.

A fan-type unit heater is equipped with standard two-point suspen- sion. A 3/8-16 threaded hanger bracket assembly is located on each side of the heater. If a fan-type unit has been ordered with optional, factory-installed, four-point suspension (Option BJ6), it will have two threaded hanger brackets on each side.

A blower-type heater is equipped with standard four-point suspen- sion. Two 3/8-16 threaded hanger bracket assemblies are located on each side of the unit. Each hanger bracket assembly is designed for threaded rod attachment.

For both "standard" and "optional" suspension point dimensions, see Dimension Tables in Paragraph 3. (Note: If installing Option CK19 hanger kit, suspension points change; see Figure 4B.)

WARNING: Suspend the heater only from the threaded hanger brackets. Do not suspend from the heater side panel.

When the heater is lifted for suspension, the bottom must be protected. If the wooden crate bottom has been removed, the bottom of the heater will have to be supported with plywood or other appropriately placed material. If the bottom is not supported, the bottom access panel could be damaged. Also, when lifting a blower unit, support the blower and motor to prevent the unit from tipping.

All blower models have legs that support the blower assembly during shipping. After the unit is suspended, these legs should be removed.

Be sure that the threaded hanger rods are locked to the heater as shown in Figure

Figure 2 -

Suspension

Form 436, Page 6

WARNING: Unit must be level for proper operation. Do not place or add additional weight to the suspended heater. See Hazard Levels, page

If an optional downturn air nozzle is used, the unit must be suspended from four points to ensure level suspension. Two hanger brackets are included in the downturn option package and must be field-installed on fan-type units with standard two-point suspension. For additional information, refer to Paragraph 26 and the instructions that are furnished with the option package. When blower-type units are equipped with an optional blower/ filter cabinet, there are two suspension points on the blower cabinet hanger bar. Suspend a unit equipped with a blower/filter cabinet from four points, using the two heater hanger bracket assemblies closest to the front of the heater and the two suspension points on the blower/filter cabinet. If one of the optional, field-installed hanger kits has been ordered for your heater, it will have been shipped separately . Each option package includes a list of components and complete, step-by-step assembly instructions.

Optional, Field-Installed Hanger Kits:

1) Four-Point Suspension (fan models only) - Option CK7

This option kit is designed to convert a fan-type heater from standard two-point suspension to four-point suspension. The kit contains two additional hanger brackets.

2) Two-Point Swivel Connectors (fan models only) - Option CK8 (See Figure 3.)

The purpose of this option kit is to adapt the standard hanger bracket so that the heater can be suspended from 1", threaded, stationary pipe. The swivel connector screws "into" the threaded hanger bracket on the heater and "onto" the 1" threaded pipe used for hanging the heater. The kit includes two swivel hanger connector assemblies and two lock washers.

4) Four-Point Swivel Connectors - Option CK10 (See Figure 4A)

This option package is used on a heater that is already equipped with fourpoint suspension to adapt it for suspension from four 1", threaded, stationary pipes. The kit includes four swivel hanger connector assemblies and four lock washers.

5) Special Four-Point Suspension with Nearly Equal Loading (applies to blower models only) - Option CK19

This suspension option is designed for special applications when a suspension system is needed that has nearly equal loading at all four suspension points. Use this option in installations with spring isolation designed for seismic protection or when threaded rod hangers are longer than twelve inches. Suspension points change with the addition of hanger kit Option CK19; see Figure 4B.

Figure 4B - Suspension Dimensions (inches and mm) for Model BE Heater with Hanger Kit Option CK19

Size A B

25-50 11-7/8 (302) 9-1/8 (232) 75 13-7/8 (352) 11-1/8 (283) 100 15-7/8 (403) 13-1/8 (333) 125 21-5/8 (549) 18-7/8 (479) 165 18-5/8 (473) 15-7/8 (403) 200 21-5/8 (549) 18-7/8 (479) 250 27-1/8 (689) 24-3/8 (618) 300 27-1/8 (689) 24-3/8 (618) 400 35-3/8 (897) 32-5/8 (829)

Figure 3 - TwoPoint Suspension with Swivel Connections (fan models only)

3) Four-Point with Swivel Connectors (fan-models only) Option CK9 (See Figure 4A)

This option package is designed to convert a fan-type heater from standard two-point suspension to four-point suspension with swivel connectors. By installing this kit the standard fan-type heater can be hung from four 1", threaded, stationary pipes. The kit includes two hanger bracket assemblies, four swivel hanger connector assemblies and four lock washers.

Figure 4A - Four-Point Suspension with Swivel Connections (Applies to both fan and blower models)

9. Venting

These power-vented unit heaters are designed to operate safely and efficiently with either a horizontal or vertical vent. (Horizontal vent run is recommended for maximum fuel savings.)

WARNING: Units installed in multiples require individual vent pipe runs and vent caps. Manifolding of vent runs is not permitted due to possible recirculation of combustion products into the building and possible back pressure effects on the combustion air proving switch.

Specific Venting Requirements (read all before

installing)

1. Venter (Flue) Outlet Venter Outlet Size:

Model Size Outlet Diameter

25-100 4" (102 mm) 125-250 5" (127 mm) 300-400 6" (152 mm)

Mfg P/N 98807 Rev 8, Page 7

9. Venting (cont'd)

Venter Outlet Attachment Requirements:

• If the pipe used in the vent run is larger than the diameter of the venter outlet (See Vent Length Table 2), make the transition at the venter outlet.

• A minimum of 12" of straight pipe is required at the venter outlet (or transition fitting) before installing an elbow in the vent system. An elbow should never be attached directly to the venter. An elbow attached to the straight pipe can be in any position at or above horizontal. See Figure 5.

Figure 5 - Alternate Vent Directions (vent in any position above horizontal; minimum of 12" of straight pipe required before an elbow)

2. Vent Pipe

If installed with a horizontal vent run, use either vent pipe approved for a Category III heater or appropriately sealed 26-gauge galvanized steel or equivalent single-wall pipe. If at least half of the equivalent length of the vent system is vertical, vent pipe approved for a Category I heater may be used. Singlewall pipe or double-wall (Type B) vent pipe are suitable for use with a Category I heater. Use only one of the flue pipe diameters listed in the Vent Length Tables for the furnace size being installed.

2A. Vent Pipe Diameter Reduction

If at least half of the equivalent length of the vent system is vertical, the vent pipe diameter may be reduced one inch from the standard diameter listed in Vent Length Table 1. Only single-wall pipe is suitable for use when reducing the pipe diameter. A taper-type reducer must be used. The maximum allowable vent length remains the same. If required, double wall pipe may be used at the terminal end as shown in Figure 6. (Use the equivalent length for elbows as shown in Vent Length Table 1 for the standard vent pipe diameter. All elbows used in the vent system must be considered.)

3. Vent Length Tables

Table 1: Maximum Permissible Vent Lengths

V ent Pipe Maximum Equivalent Straight

Model Diameter Vent Length* Length** - ft (m)

-" (mm) - ft (m) 90o Elbows 45o Elbows

25 4"(102) 30 ft (9.1 m) 3.5' (1 m) 1.8' (.5 m) 50 4"(102) 40 ft (12.2 m) 5' (1.5 m) 2.5' (.8 m)

75 4"(102) 50 ft (15.2 m) 7' (2.1 m) 3.5' (1.1 m) 100 4"(102) 50 ft (15.2 m) 7' (2.1 m) 3.5' (1.1 m) 125 5"(127) 50 ft (15.2 m) 5' (1.5 m) .5' (.8 m) 165 5"(127) 50 ft (15.2 m) 9' (2.7 m) 4.5' (1.4 m) 200 5"(127) 50 ft (15.2 m) 8' (2.4 m) 4.0' (1.2 m) 250 5"(127) 50 ft (15.2 m) 10' (3.0 m) 5' (1.5 m) 300 6"(152) 50 ft (15.2 m) 11' (3.4 m) 5.5' (1.7 m) 400 6"(152) 50 ft (15.2 m) 15' (4.6 m) 7.5' (2.3 m)

Form 436, Page 8

T able 2: Optional Maximum Permissible Vent Lengths

(Requires an increase in vent pipe diameter.)

V ent Pipe Maximum Equivalent Straight

Model Diameter Vent Length* Length** - ft (m)

- " (mm) - ft (m) 90o Elbows 45o Elbows

100 5" (127) 60 ft (18.3 m) 8' (2.4 m) 4.0' (1.2 m)

165 6" (152) 60 ft (18.3 m) 10' (3.0 m) 5.0' (1.5 m) 200 6" (152) 60 ft (18.3 m) 12' (3.7 m) 6.0' (1.8 m) 250 6" (152) 70 ft (21.3 m) 8' (2.4 m) 4.0' (1.2 m) 300 7" (178) 70 ft (21.3 m) 13' (4.0) 6.5' (2.0 m) 400 7" (178) 90 ft (27.4 m) 14' (4.3) 7.0' (2.1)

*Note 1: If the system contains all vertical pipe or a combination of horizontal and vertical vent pipe, the Maximum Permissible Vent Length shown in Tables 1 and 2 may be increased one foot for each foot vertical rise up to a maximum increase of 10 feet for model sizes 25 thru 100 and up to 20 feet for model sizes 125 thru 400.

**Reduce the maximum vent length by the amount indicated for each elbow.

4. Vent System Joints

Vent system joints depend on the installation and the type of pipe being used.

• If using single wall, 26-gauge or heavier galvanized pipe, secure slipfit connections using sheet metal screws or rivets. Seal pipe joints either with tape suitable for 550

F (such as Option FA1, P/N 98266) or

high-temperature silicone sealant.

• If using Category III vent pipe, follow pipe manufacturer's instructions for joining pipe sections. When attaching Category III pipe to the venter outlet or the vent cap, make secure, sealed joints following a procedure that best suits the style of Category III pipe being used.

• If using double-wall (Type B) vent pipe (allowed only if 1/2 of the equivalent vent length is vertical), follow pipe manufacturer's instructions for joining pipe sections. For joining double-wall pipe to the venter outlet collar, single-wall pipe, and/or the vent cap, follow the instructions below.

Instructions for attaching double-wall (Type B) vent pipe to the venter outlet, a single-wall pipe run, or to the vent cap (use these instructions for either full length double-wall or terminal only):

Hardware and Sealant Required: 3/4" long sheetmetal screws; and a tube of RTV

1) Look for the "flow" arrow on the vent pipe; attach according to the arrow. Slide the pipe so that the venter outlet, the single-wall pipe, or the vent cap is inside the double-wall pipe.

2) Drill a hole through the pipe into the outlet collar, the single-wall pipe, or the vent cap. (Hole should be slightly smaller than the sheet metal screw being used.) Using a 3/4" long sheet metal screw, attach the pipe. Do not overtighten. Repeat, drilling and inserting two additional screws evenly spaced (120o apart) around the pipe.

3) Use RTV to seal any gaps. If there is an annular opening, run a large bead of RTV in the opening. The bead of RTV must be large enough to seal the opening, but it is not necessary to fill the full volume of the annular area.

5. Vent System Support

Support lateral runs every six feet, using a non-combustible material such as strap steel or chain. Do not rely on the heater for support of either horizontal or vertical vent pipe

6. Condensation

Single wall vent pipe exposed to cold air or run through unheated areas must be insulated. Where extreme conditions are anticipated, install a means of condensate disposal.

7. Vent Terminal (Pipe and Vent Cap)

The vent system must be terminated with a suitable vent cap that is the same size as the vent run. Heaters installed in Canada must be equipped with the vent cap sup- plied as optional equipment by the heater manufacturer (Option CC1 or Option BT2). Heaters installed in the United States must be equipped with the heater manufacturer's vent cap, a Type L Breidert Air-x-hauster vent cap, or equivalent. Use of a vent cap supplied by the pipe manufac-

turer is not permitted; the vent cap must be the type approved for use with this heater. A different style vent cap could cause nuisance problems or unsafe conditions. See the illustrations in Figures 6 and 7 for requirements of both vertical and horizontal vent termination. The vent terminal section may be

Figure 6 - Vertical Vent Terminals

either single-wall or double-wall (Type B) vent pipe. If double-wall pipe is used in the vent terminal with a single-wall vent run, follow the instructions in No. 4, V ent System Joints, to attach the vent cap and to connect the double-wall pipe to the single-wall vent pipe run.

Figure 7 - Horizontal Vent Terminals

Horizontal V ent Terminal Clearances:

The location of the termination of the horizontal vent system must be in accordance with National Fuel Gas Code Z223.1. Required minimum clearances are listed on the right. Products of combustion can cause discoloration of some building finishes and deterioration of masonry materials. Applying a clear silicone sealant that is normally used to protect concrete driveways can protect masonry materials. If discoloration is an esthetic problem, relocate the vent or install a vertical vent.

Structure Minimum Clearances for V ent Termination

Location (all directions unless specified)

Forced air inlet within 10 ft (3.1m) 3 ft (0.9m) above Combustion air inlet of another appliance 6 ft (1.8m) Door, window, or gravity air inlet 4 ft (1.2m) horizontally (any building opening) 4 ft (1.2m) below

3 ft (0.9m) above Electric meter, gas meter * and relief equipment 4 ft (1.2m) horizontally Gas regulator * 3 ft (0.9m) Adjoining building or parapet 6 ft (1.8m) Grade (ground level) 7 ft (2.1m) above *Do not terminate the vent directly above a gas meter or service regulator.

Mfg P/N 98807 Rev 8, Page 9

10. Gas Piping and Pressures

WARNING

This appliance is equipped for a maximum gas supply pressure of 1/2 pound, 8 ounces, or 14 inches water column. Supply pressure higher than 1/2 pound requires installation of an additional service regulator external to the unit.

PRESSURE TESTING SUPPLY PIPING

Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve from the gas supply line which is to be tested. Cap or plug the supply line. Test Pressures Below 1/2 PSI: Befor e testing, close the manual

valve on the heater.

All piping must be in accordance with requirements outlined in the National Fuel Gas Code ANSI/Z223.1a (latest edition), published by the American Gas Association or CAN/CGA-B149.1 and B149.2, published by the Canadian Gas Association (See Paragraph 1). Gas supply piping installation should conform with good practice and with local codes.

Unit heaters for natural gas are orificed for operation with gas having a heating value of 1000 (+ or - 50) BTUH per cubic ft. If the gas at the installation does not meet this specification, consult the factory for proper orificing.

Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical constituents of the gas being supplied.

Install a ground joint union and manual shut-off valve upstream of the unit control system, as shown in Figure 8. The 1/8" plugged tapping in the shut-off valve provides connection for supply line pressure test gauge. The National Fuel Gas Code requires the installation of a trap with a minimum 3" drip leg. Local codes may require a minimum drip leg longer than 3" (typically 6").

Gas connection sizes are included in the Dimensional Tables in Paragraph 3. After all connections are made, disconnect the pilot supply at the control valve and bleed the system of air. Reconnect the pilot line and leak-test all connections by brushing on a soap solution.

Sizing a Gas Supply Line

Ca pa c it y of P i pin g

Cubic Feet per Hour based on 0.3" w .c. Pressure Drop

Sp ecific Grav ity fo r N at ural G as -- 0.6 (N atu ral G as -- 10 0 0 B T U /C u bic Ft )

Specific Gravity for Propane G as -- 1.6 (P ropane Gas -- 2550 BT U /Cubic Ft)

Length Diameter of Pipe

of 1/2" 3/4" 1" 1-1/4" 1-1/2" 2"

Pipe Natu ral Propane N atural Pro p ane Natural Pro pane Natural Propane N atural Pro p ane Natural Pro pane

20' 92 56 190 116 350 214 730 445 1100 671 2100 1281 30' 73 45 152 93 285 174 590 360 890 543 1650 1007 40' 63 38 130 79 245 149 500 305 760 464 1450 885 50' 56 34 115 70 215 131 440 268 670 409 1270 775 60' 50 31 105 64 195 119 400 244 610 372 1105 674 70' 46 28 96 59 180 110 370 226 560 342 1050 641 80' 43 26 90 55 170 104 350 214 530 323 990 604

90' 40 24 84 51 160 98 320 195 490 299 930 567 100' 38 23 79 48 150 92 305 186 460 281 870 531 125' 34 21 72 44 130 79 275 168 410 250 780 476 150' 31 19 64 39 120 73 250 153 380 232 710 433 175' 28 17 59 36 110 67 225 137 350 214 650 397 200' 26 16 55 34 100 61 210 128 320 195 610 372

N o t e: W h e n s iz in g s u p p ly lin e s , c o n s id e r p o s s ib ilit ie s o f f u t u r e exp a n s io n a n d in c re a s ed r eq u ir e m e n t s .

Refer to National F uel G as Code for additional information on line siz ing.

Form 436, Page 10

Figure 8 - Supply Piping Connection

WARNING: All components of a gas supply system must be leak tested prior to placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury , property damage or death.

Manifold or Orifice Pressure Settings

Measuring manifold gas pressure cannot be done until the heater is in operation. It is included in the steps of the "Check-Test-Start" proce-

dure in Paragraph 24. The following warnings and instructions apply.

WARNING: Manifold gas pressure must never exceed 3.5" w.c. for natural gas and 10" w.c. for propane gas.

For Natural Gas: Manifold gas pressure is regulated by the combina-

tion valve to 3.5" w.c. Inlet pressure to the valve must be a minimum of 5" w.c. or as noted on the rating plate and a maximum of 14" w.c.

For Propane Gas: Manifold gas pressure is regulated by the combination valve to 10" w.c. Inlet pressure to the valve must be a minimum of 11" w.c. and a maximum of 14" w.c.

Before attempting to measure or adjust manifold gas pressure, the inlet (supply) pressure must be within the specified range for the gas being used both when the heater is in operation and on standby. Incorrect inlet pressure could cause excessive manifold gas pressure immediately or at some future time.

Instructions to Check Manifold Pressure:

1) With the manual valve (on the combination valve) positioned to prevent flow to the main burners, connect a manometer to the 1/8" pipe outlet pressure tap in the valve. NOTE: A manometer (fluid-filled gauge) is recommended rather than a

spring type gauge due to the difficulty of maintaining calibration of a spring type gauge.

2) Open the valve and operate the heater. Measure the gas pressure to the manifold. Normally adjustments should not be necessary to the factory preset regulator.

If adjustment is necessary, set pressure to correct settings by turning the regulator screw IN (clockwise) to increase pressure. Turn regulator screw OUT (counterclockwise) to decrease pressure.

Consult the valve manufacturer's literature provided with the heater for more detailed information.

11. Electrical Supply and Connections

All electrical wiring and connections, including electrical grounding MUST be made in accordance with the National Electric Code ANSI/NFP A No. 70 (latest edition) or, in Canada, the Canadian Electrical Code, Part I-C.S.A. Standard C22.1. In addition, the installer should be aware of any local ordinances or gas company requirements that might apply. Check the rating plate on the heater for the supply voltage and current requirements. A separate line voltage supply with fused disconnect switch should be run directly from the main electrical panel to the heater. All external wiring must be within approved conduit and have a minimum temperature rise of 60 Conduit from the disconnect switch must be run so as not to interfere with the service panels of the heater. The electrical supply connects at the top back of the heater in the left corner (left when facing the back of the heater). A threaded hole is provided for a standard 1/2" electrical fitting. The wiring access panel is easily removed for field connections. Consult the wiring diagram supplied with your heater. Replace the panel after the wiring connections are made. If the heater has field-installed options that require electrical connections, consult the instruction sheet and wiring diagram supplied in the option package. A fan-type heater may be equipped with a built-in fused disconnect switch (Option AI-1). If the heater is equipped with a builtin disconnect switch, a two-position toggle (on/off) switch is located near the electrical supply access panel (See Figures 9A and 9B). This switch may be used to disconnect the power when servicing the heater other than in the supply junction box. Specific wiring diagrams that include standard and factory-installed options are included with the heater. Check the wiring diagram to identify optional equipment.

Field Wiring

from Disconnect

in Conduit

Threaded

Hole for

Standard 1/2"

Fitting

Note: Fan-type

heaters with optional built-in disconnect switch, have an on/off switch located near the electrical supply access panel.

Remove

Access

Panel to

make

connections

Figure 9A - Electrical Connections

WARNINGS: On a heater with a unit disconnect switch (Option AI-1), if the power is turned off at the switch, the supply lead in the electrical supply junction box (Figure 9A) remains energized. If service is to be done in the supply junction box, turn off the power at the remote disconnect switch.

If you turn off the power supply , turn off the gas.

The operating sequence of the heater can be found on the heater wiring diagram and is published in Paragraph 24, Check Installation and Start-Up. Typical wiring diagrams ar e on the next four pages, showing standard singlestage heating with spark pilot with and without lockout.

CAUTION: If any of the original wire as supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 limit control and sensor lead wires which must be 150oC. See Hazard Levels, page 2.

12. Thermostat and Thermostat

Connections

A thermostat is not standard equipment but is an installation requirement. Use either an optional thermostat available with the heater or a field-supplied thermostat. Install according to the thermostat manufacturer's instructions. Make sure that the heat anticipator setting on the thermostat is in accordance with the amperage value noted on the wiring diagram of your heater. Terminal Strip Connections - The standard heater is equipped with a twoscrew terminal connector strip (See Figure 10) for easy connection to the low voltage controls (24V). When factoryinstalled options require two-stage thermostat control, the heater is equipped with a SP-ST relay and a four-screw terminal connector strip (See Figure 11). If your heater requires field installation of the four-screw terminal strip and the relay, follow the instructions packaged with the relay or thermostat option.

Figure 9B If equipped

with unitmounted disconnect switch, on/ off toggle switch is near access panel to electrical supply junction box.

Circuit breaker button for Option AI-1 unitmounted disconnect switch

C, except for

Figure 10 -

Two Screw Terminal Connector Strip for 24-volt Wiring

Figure 11 -

Four Screw Terminal Connector Strip for 24V olt Wiring

(Paragraph 12 continued on page 16.)

Mfg P/N 98807 Rev 8, Page 11

TYPICAL WIRING DIAGRAMS -- Pages 12 - 15

Field Control Wiring Length and Gauge

T otal W ire Distance from MinimumRecommended

Length Unit to Control Wire Gauge 150' (45.7 m) 75' (22.9 m) #18 gauge 250' (76.2 m) 125' (38.1 m) #16 gauge

350' (106.7 m) 175' (53.3 m) #14 gauge

Fan-Type, Power-Vented Model with Intermittent Spark Pilot, Single-Stage Heating, Natural or Propane

OPERATING SEQUENCE

1. SET THERMOSTAT AT LOWEST SETTING.

2. TURN ON MAIN AND PLOT MANUAL GAS VALVES.

3. TURN ON POWER TO UNIT.

4. SET THERMOSTAT AT DESIRED SETTING.

5. THERMOSTAT CALLS FOR HEAT ENERGIZING THE VENTER MOTOR.

6. VENTER PRESSURE SWITCH CLOSES FIRING UNIT AT FULL RATE AFTER PILOT PROVING SEQUENCE.

7. FAN CONTROL SENSES HEAT EXCHANGER TEMPERATURE, ENERGIZING THE FAN MOTOR.

8. IF THE FLAME IS EXTINGUISHED DURING MAIN BURNER OPERATION THE SAFETY SWITCH CLOSES THE MAIN VALVE AND RECYCLES THE SPARK GAP. ON UNITS EQUIPPED WITH THE G77ONGC-4 LOCKOUT CONTROL, IF PILOT IS NOT ESTABLISHED WITHIN 120 SECONDS (APPROX.) UNIT LOCKS OUT AND THE UNIT MUST BE RESET BY INTERRUPTING POWER TO CONTROL CIRCUIT (SEE LIGHTING INSTRUCTIONS).

NOTES

1. THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS: THERMOSTAT

2. THE FOLLOWING CONTROLS ARE FACTORY INSTALLED OPTIONS: S/W SWITCH

3. DOTTED WIRING INSTALLED BY OTHERS.

4. CAUTION: IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 105 DEGREES C., EXCEPT FOR SENSOR LEAD AND LIMIT WIRING WHICH MUST BE 150 DEGREES C.

5. USE #18 GA WIRE FOR ALL WIRING EXCEPT FAN MOTOR CIRCUIT.

6. LINE AND FAN MOTOR BRANCH WIRE SIZES SHOULD BE OF A SIZE TO PREVENT VOLTAGE DROPS BEYOND 5% OF SUPPLY LINE VOLTAGE.

7. ON 230V. UNITS THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY. FOR 230V. UNITS USE BLACK AND YELLOW LEADS (CAP RED). FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW). ON 115V. UNITS THE CONTROL TRANSFORMER IS A SINGLE VOLTAGE PRIMARY. FOR 115V. UNITS USE BLACK AND YELLOW LEADS.

8. SEE INSTALLATION INSTRUCTIONS FOR GREATER DETAIL.

SET ANTICIPATOR AT 0.8 AMPS

W.R 1C30-339 THERMOSTAT W-S23-6 SUBBASE

WIRING CODE BLACK - BK BROWN - BR RED - R ORANGE - O YELLOW - Y GREEN - G BLUE - BL PURPLE - PR WHITE - W

(HOT)

VENTER RELAY CONTACTS

BK BK

2 4

OPTIONAL S/W SWITCH

BK BK

FAN CONTROL

VENTER RELAY COIL

BL BR

FIELD WIRING

TERMINAL STRIP

FACTORY WIRING

PRESSURE SWITCH

CONTROL

Y YYY

5 5

FE 25-400 OPT. AH2/AH3 WD #97302 REV #8

LIMIT

115/1/60, 208/1/60 OR 230/1/60

VENTER MOTOR

LINE VOLT

24V

GRND.

STRIP

G67BG-5 RECYCLE

OR G770NGC-4 LOCKOUT 3

FLAME SENSING

IGNITION CONTROLLER

CHASSIS GRND.

CONTROL TRANSFORMER

GROUND TERMINAL (TERMINAL STRIP)

PROBE

IGNITOR

GRND

FAN MOTOR

FACTORY WIRING FIELD WIRING OPTIONAL FACTORY WIRING WIRE NUT CRIMP TERMINAL

BKBK

MAIN

PILOT

W.R. OR ROBERTSHAW REDUNDANT GAS VALVE

(COM)

WWW

GRD

TR OR PV-MV

MAIN

TH OR MV

PILOT

ALTERNATE HONEYWELL

REDUNDANT GAS VALVE

TH-TR

OR PV

CAUTION: If any of the original wire as supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least

105

C, except for limit control and sensor lead wires

which must be 150oC. See Hazard Levels, page 2.

Form 436, Page 12

Blower-Type, Power-Vented Model Sizes 25-100 with Intermittent Spark Pilot, Single-Stage Heating, Natural or Propane, Direct Drive

M odel Size Sp ee d

25 *Medium *Blue and White

L ow Red a nd White

50 *High *Bla ck and White

Medium Blue and White High Bla c k and White

75 *Medium *Blue and White

L ow Red a nd White *High *Bl a ck and White

100 Medium Blue and White

L ow Red a nd White

*Factory-wired speed

Use these Two Motor Wires

Mfg P/N 98807 Rev 8, Page 13

Blower-Type, Power-Vented Model Sizes 50-250 with Intermittent Spark Pilot, Single-Stage Heating, Natural or Propane, Belt Drive (NOTE: Belt drive is standard on Sizes 125-250; optional on Sizes 50-

100.)

Form 436, Page 14

Blower-Type, Power-Vented Model Sizes 165-400 with Intermittent Spark Pilot, Single-stage Heating, Natural or Propane, Belt Drive, Motor Contactor (NOTE: Motor contactor is standard on Sizes 300 and 400; optional on other sizes.

Mfg P/N 98807 Rev 8, Page 15

12. Thermostat Connections (cont'd)

There are some unique wiring requirements with the installation of the optional controls (relay and two-stage). Figure 12 illustrates the wiring of the relay and the connections required for optional thermostat control.

575/3/60

Figure 12 - Wiring Diagrams for Optional Controls

Multiple Heater Control - These unit heaters are not designed for multiple unit connection to one thermostat. If you require that more than one unit be controlled by a single thermostat, it will be necessary to use relays in the circuit. Options CL31 and CL32 provide the necessary parts and instructions for multiple heater control. For more information on these options, see Paragraph 30.

13. Fan Motor

Fan motors are equipped with thermal overload protection of the automatic reset type. Should the motor refuse to run, it may be because of improper current characteristics. Make certain that the correct voltage is available at the motor.

NOTE: If the unit is equipped with an optional totally enclosed motor, the horsepower may be larger than the standard motor. Refer to the motor nameplate to verify horsepower.

14. Blower Motor

Blower Model Sizes 25-100 are standardly equipped with a direct drive motor; an optional belt drive motor is available on Sizes 50-100. Blower Model Sizes 125-400 have an adjustable belt drive motor.

As part of the Check/Test/Start (Paragraph 24), check the belt for proper 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 blower bearing wear. Adjust the belt tension by turning the adjusting screw on the motor base until the belt can be depressed 1/2-3/4". (See Figure 13.) After correct tension is achieved, re-tighten the locknut on the adjusting screw.

Most blower motors are equipped with thermal overload protection of the automatic reset type. If a motor is not equipped with thermal overload protection, the unit will be equipped with a starter. The adjustable setting on the starter will be factory set to match the amp draw of the

Form 436, Page 16

Figure 13 Adjusting Belt Tension

motor and sealed. No change should be made to starter set unless the original motor is replaced.

Starters are supplied from the factory for manual reset operation. If an overload condition is experienced, the condition must be corrected, and the starter must be manually reset.

After the installation is complete including all ductwork, the amp draw of the motor should be checked with an amp meter to verify that the motor amp rating on the motor nameplate is not being exceeded. Amps may be adjusted downward by reducing blower speed for by increasing the duct system static pressure. The temperature rise must be within the range specified on the unit rating plate.

15. Blower Speed Adjustment

The blower speed may be adjusted to achieve the desired outlet temperature, as long as the adjustment is within the temperature rise and the static pressure limits shown on the heater rating plate. Direct drive

motors are factory set as indicated in the chart below. Belt drive motors are factory set at the mid-point between maximum and minimum

blower speeds. If the duct resistance is low, the blower may deliver too high an air

volume; or if the heater is operated without ductwork, it may deliver sufficient excess air to overload the motor, causing the overload protector to cycle the motor. Reducing the blower speed will correct these conditions. If ductwork is added to an installation, it may be necessary to increase the blower speed. Decreasing blower speed will increase outlet temperature; increasing blower speed will decrease outlet temperature.

Blower Model Sizes 25-100 with Direct Drive

Direct drive blower motors have multi-speed taps for speed adjustment. If your installation requires an adjustment of the blower speed, the motor may be re-wired to an alternate tap by following these instructions.

1. Turn off the gas and the electric power.

2. Remove the left (left when facing the back of the unit) outer side panel of the heater to reveal the wiring connections.

3. Consult the wiring diagram on the heater and follow the below chart to choose the wire for the desired adjustment. The asterisk(*) indicates the factory-wired speed.

Model Size Speed Use these Two Motor W i res

25 *Medium *Blue and White

Low Red and White

50 *High *Black and White

Medium Blue and White High Black and White

75 *Medium *Blue and White

Low Red and White *High *Black and White

100 Medium Blue and White

Low Red and White

4. Cut the crimped cap from the end of the wire that you intend to use and strip the insulation.

5. Disconnect the factory-wired connection and re-wire, using the newly stripped wire.

6. Put a wire nut on the end of the blower motor wire that was disconnected.

7. Replace the heater side panel and turn on the gas and the electric.

Blower Model Sizes 50-400 with Belt Drive

The belt drive on these units is equipped with an adjustable pulley which permits adjustment of the blower speed. Follow these instructions to adjust the blower speed.

1. Turn off the gas and the electric power.

2. Loosen belt tension and remove the belt.

3. Loosen the set screw on the side of the pulley away from the motor.

4. T o increase the blower speed, decreasing outlet temperature, turn the adjustable half of the pulley inward. To decrease the blower

speed, increasing the outlet temperature, turn the adjustable half of the pulley outward. One turn of the pulley will change the speed 8-10%.

5. Tighten the set screw on the flat portion of the pulley shaft.

6. Replace the belt and adjust the belt tension. Adjust tension by turning the adjusting screw on the motor base until the belt can be depressed 1/2-3/4". (See Figure 13.) Re-tighten the lock nut on the adjusting screw.

7. Turn on the gas and electric. Light the heater following the instructions on the lighting instruction plate.

8. Check the motor amps with an amp meter. The maximum motor amp rating on the motor nameplate must not be exceeded.

CAUTION: An external duct system static pressure not within the limits shown on the rating plate or improper adjustment of the motor pulley or belt may overload the motor.

16. Blower Rotation

Each blower housing is marked for proper rotation. Rotation may be changed on single-phase motors by re-wiring in the motor terminal box. Three-phase motors may be reversed by interchanging two wires on the 3-phase supply connections.

17. Fan Control

1. A fan control provides the following:

(a) Delay of fan or blower operation to prevent the discharge of

cold air.

(b) Fan or blower operation as long as the unit is hot.

2. The fan control provides additional safety by keeping the fan or blower in operation in the event that the gas valve fails to close when the thermostat is satisfied.

3. To be sure that the fan or blower can continue to operate, the power supply to the heater MUST NOT be interrupted except when servicing the unit.

4. If the customer wants the heater off at night, the gas valve circuit SHOULD BE OPENED by a single pole switch wired in series with the thermostat. Some thermostats are provided with this feature. Multiple units controlled from a single thermostat are shut off in the same manner. For proper operation, be sure the fan control wiring is observed.

WARNING: If you turn off the power supply, turn off the gas. See Hazard Levels, page 2.

NOTE: Low ambient temperatures (less than 40oF) may cause false

cycling of the fan/blower. To prevent this, a time delay relay can be added to the unit (available with single-stage gas valve only) to activate the fan/blower electrically independent of the heat exchanger or the room temperature. The low ambient fan control relay can be factory installed; Option BF8 will appear on the heater wiring diagram. Or, the relay can be field installed; order Option CQ3 (P/N 112779). This relay is in addition to the fan control The fan control is a safety

device and should never be removed from the heater circuit.

18. Limit Control

All models are equipped with an automatic, non-adjustable reset limit control that acts to interrupt the electric supply to the redundant main operating valve in case of motor failure or lack of airflow due to restrictions at the inlet or outlet.

Mfg P/N 98807 Rev 8, Page 17

19. Combustion Air Proving Switch

The combustion air proving switch is a pressure sensitive switch that monitors air pressure to ensure that proper combustion air flow is available. The switch is a single pole - normally open - device which closes when a decreasing pressure is sensed in the outlet duct of the flue gas collection box.

On start-up when the heater is cold, the sensing pressure is at the most negative level, and as the heater and flue system warm up, the sensing pressure becomes less negative. After the system has reached equilibrium (about 20 minutes), the sensing pressure levels off.

If a restriction or excessive flue length or turns cause the sensing pressure to become less than the switch setpoint, the pressure switch will function to shut off the main burners. The main burners will remain off until the system has cooled and/or the flue system resistance is reduced. The Table on the right lists the approximate water column negative pressure readings and switch setpoints for sea level operating conditions.

Model Start-Up Equilibrium Set Point Set Point

Size Cold "OFF" "ON"

25-400 -1.0" w.c. -0.60" w.c. -0.47" w.c. -0.64"w.c.

DANGER: Safe operation of this unit requires proper venting flow . NEVER bypass combustion air proving switch or attempt to operate the unit without the venter running and the proper flow in the vent system. Hazardous conditions could result. See Hazard Levels, page 2.

20. Gas Valve

Main operating valve is powered by the 24-volt control circuit through thermostat and safety controls. The main control valve is of the diaphragm type with magnetic pilot servo bleed operators, providing regulated gas flow preset at the factory. The valve body also incorporates a magnetic valve providing pilot gas control for the electronic ignitor system and redundant or dual valve safety shutoff function.

WARNING: The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting the unit to ensure positive closure. See Hazard Levels, page 2.

is imposed on that metal probe which is electrically isolated from ground. When the pilot flame impinges on the flame sensing probe, the flame acts as a conduction path to ground. The pilot flame rectifies and completes the DC circuit. The ignition controller acknowledges the flame and energizes the main gas valve.)

22. Burners

These unit heaters have individually formed steel burners with accurately die-formed ports to give controlled flame stability without lifting or flashback with either natural or propane gas. The burners are lightweight and factory mounted in an assembly which permits them to be removed as a unit for inspection or service.

23. Burner Air Adjustment

All sizes of these unit heaters that are equipped with standard aluminized burners are designed to operate without burner air shutters when fueled with either natural or propane gas. However, Sizes 165 through 400 equipped with optional stainless steel burners (Option AD2) require air shutters (Option AE1) when used with propane gas (Option AA2).

Optional air shutters, either factory or field installed, are available for any size model for use where unusual conditions cause excess primary aeration.

Before making any adjustments to the air shutters, allow the heater to operate for about fifteen minutes. The air shutter adjustment screws can be reached by opening the bottom panel. (Remove the two screws located at the rear of the bottom panel and allow the panel to hinge down from the front.) The adjustment screws for the air shutters are visible at the rear of the burner rack . See Figure 14.

When making the adjustment, close the air shutters no more than is necessary to eliminate the problem condition.

Observe the flame for yellow-tipping. A limited amount of yellowtipping is permissible for liquefied petroleum gases. Other fuels should not display any yellow-tipping.

T wo adjustment screws are used (See Figure 14). Rotating the screws clockwise closes the shutters, reducing the primary air supply. Counterclockwise rotation opens the shutters, increasing the primary air supply. The two adjustment screws should be rotated alternately to open or close the shutters. Attempting to gain adjustment by not alternating between the two screws may cause the shutters to bind.

After proper adjustment has been completed, eliminating the problem condition, close the bottom panel and replace the retaining screws.

Figure 14 - Air Shutter Adjustment Screws -- Alternate Turning Screws When Adjusting Shutter

21. Pilot and Ignition System

These unit heaters are equipped with a spark ignited intermittent safety pilot system that shuts off the pilot gas flow between heat cycles. In addition, propane units are equipped with a spark pilot system that incorporates a lockout device that stops the gas flow to the pilot if the pilot fails to light in 120 seconds. The spark pilot with 100% lockout requires manual reset by interruption of the thermostat circuit. Propane units require the lockout; natural gas units may be equipped with either standard spark pilot or spark pilot with lockout (Option AH3). Refer to the wiring diagram with your heater for pilot system identification and proper wiring.

The ignition controller in the spark pilot system provides the high voltage spark to ignite the pilot gas and also acts as the flame safety device. After ignition of the pilot gas, the control electronically senses the pilot flame. (A separate solid metal probe in the pilot burner assembly is employed for the flame sensing function. A low voltage electrical signal

Form 436, Page 18

DANGER: Failure to install and/or adjust air shutters according to directions could cause property damage, personal injury , and or death.

24. Check Installation and Start-Up

Check the installation prior to start-up:

o Check suspension. Unit must be secure and level. o Blower Model - Check to be sure that all shipping supports

have been removed. Rubber feet must be on the motor bracket bolts. See Paragraph 4.

o Check clearances from combustibles. Requirements are shown

in Paragraph 6.

o Check vent system to be sure that it is installed according to

the instructions in Paragraph 9.

o Check piping for leaks and proper gas line pressure. Bleed

gas lines of trapped air. See paragraph 10.

o Check electrical wiring. Be sure all wire gauges are as rec-

ommended. A service disconnect switch should be used. V erify that fusing or circuit breakers are adequate for the load use.

o Check that any field-installed options have been included in

the installation.

o Blower Model - Check belt tension. See Paragraph 14.

Start-Up -- Typical Operating Sequence:

1. Set thermostat at lowest setting.

2. T urn on main and pilot manual gas valves.

3. Turn on the power to the unit.

4. Set the thermostat to desired setting.

5. Thermostat calls for heat, energizing the venter motor.

6. Venter pressure switch closes, firing the unit, after pilot proving sequence.

7. Fan control senses heat exchanger temperature, energizing the fan or blower motor.

8. If the flame is extinguished during the main burner operation, the safety switch closes the main valve and recycles the spark gap. On units equipped with lockout device, if the pilot is not established within 120 seconds, the unit locks out and must be reset by interrupting power to the control circuit. (See lighting instructions on the heater.)

Check installation after start-up:

o With the unit in operation, measure manifold gas pressure.

Manifold pressure for natural gas should be 3.5" w.c. and 10" w.c. for propane gas. See Paragraph 10.

o Turn the unit off and on, pausing two minutes between each

cycle. Observe for smooth ignition.

o Blower Model - Check motor amps with an amp meter. The

maximum amp rating on the motor nameplate must not be exceeded.

o Place 'Owner's Envelope" containing Limited Warranty Card,

this booklet, and any optional information in an accessible location near the heater. Follow the instructions on the envelope.

DANGER: The gas burner in this gas-fired equipment is designed and equipped to provide safe and economically controlled complete combustion. However, if the installation does not permit the burner to receive the proper supply of combustion air, complete combustion may not occur. The result is incomplete combustion which produces carbon monoxide, a poisonous gas that can cause death. Safe operation of indirect-fired gas burning equipment r equires a properly operating vent system which vents all flue products to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD WHICH COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH. Always comply with the combustion air requirements in the installation codes and in Paragraphs 6 and 7. Combustion air at the burner should be regulated only by manufacturer-provided equipment. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER. Indoor units installed in a confined space must be supplied with air for combustion as required by Code and in Paragraph 7 of this heater installation manual. MAINT AIN THE VENT SYSTEM IN STRUCTURALLY SOUND AND PROPERLY OPERATING CONDITION.

Mfg P/N 98807 Rev 8, Page 19

OPTIONAL EQUIPMENT

This section contains a brief description of the more frequently specified field-installed options. All option packages include complete assembly and installation instructions.

25. Optional Vertical Louvers Option CD1

The purpose of the addition of optional vertical louvers is to increase the air pattern spread. The vertical louver assembly is designed to be field assembled and installed. Refer to the instructions packaged with Option CD1 for a list of components and step-bystep installation instructions (Do not add optional vertical louvers to a fan-type heater with downturn nozzle Option CD3. See Paragraph

26.)

CAUTION: To avoid getting burned, adjust louvers prior to heater operation. If louvers need re-adjusting after start-up, wear protective gloves.

Figure 15 Optional Vertical Louvers

26. Optional Downturn Air Nozzles

- Options CD2, CD3, CD4, & CD5

Sizes "A" Range of

Air Deflection

25-125 9" (229mm) 25o-65 165-400 13" (330mm) 25o-65

Figure 16 - Optional Downturn Nozzles

Sizes "A" Range of

Air Deflection

25-125 16-1/2" (419mm) 50o-90 165-400 23-1/2" (597mm) 50o-90

Unit heaters may be specified with optional downturn air nozzles to direct the discharge tempered air. The nozzles are shipped separately for field assembly and installation. The horizontal louvers are removed from the heater and re-installed into the outlet of the downturn nozzle.

The addition of a downturn nozzle requires four-point heater suspension. T wo hanger brackets are included with downturn nozzle options and must be added to fan-type heaters with standard two-point suspension. Suspension point dimensions are found in Dimension Charts in Paragraph 3. On fan-type heaters, do not install Option CD5 or use vertical louvers with Option CD3.

27. Optional Duct Flange - Option CD9 (Blower Models only)

Blower-type unit heaters may be connected to ductwork. The duct flange option is designed to adapt the heater outlet (supply side) for connection to ductwork.

Ductwork connection sizes are shown in the chart below. Follow the installation instructions included with the option package.

Model BE Duct Connection Sizes (inches and mm) with Optional Duct Flange Size 25-50 75 100 125 165 200 250-300 400 Height 15-7/8 15-7/8 15-7/8 15-7/8 23-7/8 23-7/8 23-7/8 23-7/8

403 403 403 403 606 606 606 606

Width 10-3/4 12-3/4 14-3/4 20-1/2 17-1/2 20-1/2 26 34-1/4

273 324 375 521 445 521 660 870

Form 436, Page 20

28. Optional Polytube Adapter - Options CD6, CD8, and CD11 (Blower Models only)

The polytube adapter option is designed to adapt this blowertype heater for use with polytube ductwork. The use of polytubes for air distribution is common in greenhouse applications and some industrial applications. A polytube distribution system delivers warm air to a specific area, reducing the need for complete area heating. The polytube adapter is available in three installation designs making it adaptable to many applications and building structures.

Figure 17 - Polytube Adapter

Illustration shows Option CD8, Polytube Adapter for Floor-Mounted Heater. Options CD6 and CD11 are for Suspended Heaters.

WARNINGS: This adapter is to be used only on units equipped with a blower. At no time should the free area in the polytube be less than the listed minimum. Failure to comply with these warnings could result in severe personal injury, death and/or property damage.

The following chart shows specification information covering the use of polytubes with these blower-type unit heaters.

CFM at Polytube Minimum Free

Size .25" Diameter Area (square

ESP (inches) Inches)

75 925 18 110

100 1235 18 145

125 1540 18 185

130 1600 24 190

165 2035 24 240

200 2465 24 300

250 3085 24 360

300 3700 24 425

400 4935 24 550

The polytube adapter option package does not include polytubing. Polytubing can be obtained from a supply distributor such as FOF Products, Inc., P. O. Box E, 1505 Racine Street, Delevan, WI 53115; ACME Engineering Co., P.O. Box 978, Muskogee, OK 74402; or any local greenhouse supply distributor. Some local code authorities require the polytube material to be a listed material. Consult code authority having jurisdiction and the polytube supplier to determine the appropriate polytube material and recommended methods of suspension.

Holes

Number 37pairs 75 pairs 75 pairs Diameter 1-1/2" 1" 1" Spacing 16" 12" 16" Number 50 pairs 50 pairs 100 pairs 94 p airs Diameter 1-1/2" 1-1/2" 1" 1" Spacing 12" 18" 12" 16" Number 40 pairs 60 pairs 60 pairs 125 pairs Diameter 1-7/8" 1-1/2" 1-1/2" 1" Spaci ng 15" 15" 20" 12" Number 40 pairs 60 pairs 60 pairs 125 pairs Diameter 1-7/8" 1-1/2" 1-1/2" 1" Spaci ng 15" 15" 20" 12" Number 50 pairs 50 pairs 75 pairs 75 pairs 75 pairs Diameter 1-7/8" 1-7/8" 1-1/2" 1-1/2" 1-1/2" Spaci ng 12" 18" 16" 20" 24" Number 42 pairs 42 pairs 60 pairs 60 pairs 100 pairs Diameter 2-1/4" 2-1/4" 1-7/8" 1-7/8" 1-1/2" Spaci ng 14" 21" 20" 25" 18" Number 40 pairs 60 pairs 60 pairs 60 pairs 60 pairs Diameter 2-1/2" 2" 2" 2" 2" Spaci ng 15" 15" 20" 25" 30" Number 75 pairs 75 pairs 75 pairs 75 pairs 75 pairs Diameter 2" 2" 2" 2" 2" Spaci ng 9" 12" 16" 20" 24" Number 60 pairs 60 pairs 60 p airs 100 p airs 100 pairs Diameter 2-1/2" 2-1/2" 2-1/2" 1-7/8" 1-7/8" Spacing 10" 15" 20" 15" 18"

Suggeste d Hole Sizes and Locations

Length of Polytube

50 Ft 75 Ft 100 Ft 125 Ft 150 Ft

Conversion T able (Diameter to Area)

Diameter of the Hole Area of the Hole (inches) (sq in) 2-1/2 4.91 2-1/4 3.98 2 3.14 1-7/8 2.76 1-1/2 1.76

1 0.785

Mfg P/N 98807 Rev 8, Page 21

29. Optional Guards Options CD10 & CD12 (Blower Models only)

These guard options are designed to provide complete protection from the rotating drive and/or blower components. Option CD12 is designed for use with Sizes 25-100 with standard direct drive motor. This kit includes only the blower inlet guard.

Option CD10 is designed for use on Sizes 50-400 with a belt driven motor and includes both the belt guard and the blower inlet guard.

Figure 18 - Optional Guards

Optional Belt Guard Installed

Optional Blower Inlet Guard Installed

30. Optional Multiple Heater Control Options CL31 & CL32

The multiple heater control options are designed to permit the control of up to six heaters (one master and five slave units) with a single thermostat or a time clock and single/multiple thermostats.

For maximum safety, the multiple control is one in the low voltage circuit. These multiple heater control options may not be used with two-stage gas valves.

Figure 19 - Multiple Heater Control Wiring with Options CL31 and/or CL32

31. Optional Blower/Filter Cabinet -

Options CW1, CW2, or CW3 (Blower Models Only)

The blower/filter cabinet option is available for all sizes. The blower/filter cabinet is shipped separately for field assembly and installation. The cabinet is adaptable for use with either 1" or 2" filters and may be connected to a return air duct (includes 3/4" duct flange). Option CW1 does not include filters; CW2 includes 1" permanent aluminum filters; and CW3 includes 2" permanent aluminum filters.

Figure 20 - Optional Field-Installed Blower/Filter Cabinet

Blower Cabinet with Filters (Option CW2 or CW3) -- side panel removed to illustrate interior of cabinet

Blower Cabinet without Filters (Option CW1)

Model Filter Replacement P/N

Size Qty Size 1" Filter 2" Filter

25-125 1 20 x 20 101608 101621

165-200 1 16 x 25 101609 101622

1 20 x 25 101610 101623

250-300 2 16 x 20 101607 101620

2 20 x 20 101608 101621

400 2 16 x 25 101609 101622

2 20 x 25 101610 101623

Form 436, Page 22

SERVICE AND MAINTENANCE

WARNING: If you turn off the power supply, turn off the gas. See Hazard Levels, page 2.

This unit will operate with a minimum of maintenance. To ensure long life and satisfactory performance, a heater that is operated under normal conditions should be inspected and cleaned at the start of each heating season. If the heater is operating in an area where an unusual amount of dust or soot or other impurities are present in the air, more frequent maintenance is recommended.

The following procedures should be carried out at least annually (See Paragraphs 32-41 for specific instructions.):

1. Clean all dirt and grease from the primary and secondary combustion air openings.

2. Fan Models - Clean the fan blade, fan guard, and motor.

3. Blower Models - Clean the blower, the belt guard, the inlet guard, and motor of all dirt and grease. Check the blower belt for tension and wear. Replace a worn belt that may fail before the next scheduled maintenance check.

4. Clean the heat exchanger both internally and externally.

5. Check the pilot burner and main burners for scale, dust, or lint accumulation. Clean as needed.

6. Check the vent system for soundness. Replace any parts that do not appear sound.

7. Check the wiring for any damaged wire. Replace damaged wiring. (See Paragraph 11 for replacement wiring requirements.)

NOTE: Use only factory-authorized replacement parts.

visible. Do the following:

(a) Disconnect the pilot tubing from the pilot burner.

(b) Disconnect the flame sensing wire and high tension (spark) lead from the ignition controller.

7A. Heaters manufactured beginning 8/91 (Serial No. Date Code

AQH) - The burner rack is indexed as illustrated in Figure 23. While supporting the burner rack, remove the screws (two or three) that hold the burner rack support. (For screw location, refer to Figure

23.) Remove the burner rack support allowing the burner rack assembly to swing down (See Figure 24).

Pilot Tubing

Figure 22 - Spark Pilot Location

Flame Sensor Lead

Burner Rack Support with Indexing

Burner Rack Support on units

Screws

manufactured prior to 8/91 was not indexed

Figure 23 - Burner Rack Support and Retaining Screws

32. Burner Rack Removal

These unit heaters have a convenient bottom access panel. The pilot is attainable with the bottom panel open. With the access panel removed, the burner rack assembly will hinge down for removal. Use the following step-by-step instructions for removal of the bottom access panel and the complete burner rack assembly.

Instructions for Burner Rack Removal (See Figures 21-24.)

1. Shut the gas supply off ahead of the combination valve.

2. Turn off electric supply.

3. Remove the two sheet metal screws located at the rear of the bot-

tom panel.

4. Allow bottom panel to hinge down from the front.

5. Push in one of the two springloaded hinge pins located at the front of the bottom panel (inside), and completely remove the bottom panel.

6. The bottom of the pilot is now

Push hinge pin to remove bottom panel

Figure 21- Bottom Access Panel Open

Pilot Location

7B. Heaters manufactur ed prior to 8/91 (Serial No. Date Code AQH)

Loosen the sheet metal screws (two or three) located at the front of

the burner rack assembly. See Figures 23. These screws retain the burner rack support. While supporting the burner rack assembly, slide the burner rack support and remove it from the screws, allowing the burner rack assembly to swing down (See Figure 24).

8. To Remove the Burner Rack -- With the burner rack assembly

"hanging" down, lift up on the rear and slide the assembly up and out of the manifold support brackets.

Figure 24 Burner Rack Hinged Down

Mfg P/N 98807 Rev 8, Page 23

32. Burner Rack Removal (cont'd)

Figure 25

Burner Assembly Support Brackets

Burner Orifices

moval, Paragraph 32. The pilot can be removed to check the wiring, the spark gap, or to remove the orifice for cleaning. When the pilot is re-installed, be sure to include the pilot hole cover plate.

Pilot Hole Cover Plate

Figure 26 Burner Rack Completely Removed

9. To remove the individual burners:

a. Remove the flash car-

ryover (one screw per burner).

b. With the burner rack

upside down, remove the sheet metal screws (located at the rear) that retain the burner holddown.

c. Lift the rear of the

burner upward slightly and pull back, removing the individual burners.

d. To replace individual burners, reverse the above procedure.

10. To replace the burner rack assembly and the bottom panel, reverse the above procedure (Steps 1-8).

Individual burners may be cleaned using air pressure. Use an air nozzle to blow out scale and dust accumulation from the burner ports. Alternately, blow through burner ports and venturi.

Figure 27 - Individual Burners

CAUTION: Eye protection is recommended.

Use a fine wire to dislodge any stubborn particles. Do not use anything that might change the port size.

When any service is completed, be careful to reassemble correctly to ensure that no unsafe conditions are created. When re-lighting, always follow the lighting instructions on the heater.

33. Pilot and Ignition System

The pilot can be serviced by opening the bottom access panel of the heater. Follow the first four steps of instructions for Burner Rack Re-

Form 436, Page 24

Figure 28 - Pilot Removal

Spark gap must be maintained to .100". (See Figure 29.)

Figure 29 Pilot Burner Spark Gap

In the event the pilot flame is short and/or yellow, check the pilot orifice for blockage caused by lint or dust accumulation.

Remove the pilot orifice and clean with air pressure. Check and clean the aeration slot in the pilot burner.

Figure 30 Pilot Assembly

CAUTION: Due to high voltage on pilot spark wire and pilot electrode, do not touch when energized. See Hazard Levels, page 2.

The ignition controller of the intermittent electronic ignition pilot sys- tem is visibly located on the back of the heater. (See Figure 31.) Do not attempt to disassemble the ignition controller. There are no field replaceable components in the control enclosure. However, each heating season the lead wires should be checked for insulation deterioration and good connections.

Proper operation of the electronic spark ignition system requir es a minimum flame signal of .2 microamps as measured by a microampmeter.

For further information and check out procedure on the intermittent electronic ignition pilot system, refer to the manufacturer's control operating instructions supplied with the heater.

Figure 31

- Ignition Controller Location

Ignition Controller for Spark Pilot

34. Burner Orifices

Heaters are shipped with orifices of proper size and type for gas and altitude specified on the order. When ordering replacement orifices, give BTUH content, specific gravity of gas, and altitude, as well as model and serial number of the heater.

Main Burne r Orifices (sea level)

Model Natural Gas Propane G as

Size Drill

25 51 39650 2 60 95936 2 50 47 84853 3 1.2MM 63003 3

75 45 38678 4 1.3MM 64676 4 100 44 11833 5 55 11830 5 125 44 11833 6 55 11830 6 165 35 11831 5 1.65MM 96344 5 200 35 11831 6 1.65MM 96344 6 250 35 11831 8 1.65MM 96344 8 300 35 11831 9 1.65MM 96344 9 400 35 11831 12 1.65MM 96344 12

Pilot Orifice

Natural - P/N 103034 Propane - P/N 98695

WARNING: Do not use this table for gas conversion. Additional parts are required; contact your Reznor Distributor.

Siz e

Orifice

P/N

Qty Drill Size

Orifice

P/N

Qty

CAUTION: Eye protection is recommended.

36. Heat Exchanger

The outside of the heat exchanger can be cleaned from the front of the heater with an air hose and/or a brush. Remove all accumulated dust and grease deposits.

The inner surfaces of the heat exchanger can be reached for cleaning with the burner rack removed. (See Paragraph 32.) Cleaning can be done with a long furnace brush or a heavy wire to which steel wool has been attached. Brush up and down inside each heat exchanger tube until all foreign material is removed. A flashlight is helpful in examining the upper section of the tube.

37. Fan or Blower

Remove dirt and grease from the motor. On fan model units, remove dirt and grease from the fan guard and

blades. Use care when cleaning the fan blades to prevent causing misalignment or imbalance. Check that the hub of the fan blades is secure to the shaft.

On blower models, remove the grease and dirt from the blower housing and check the belt for wear and proper tension (See Paragraph 14.)

Lubricate if the motor has oil cups or grease fittings. The motor supplied as standard has lifetime lubrication and sleeve bearings.

On blower models, check current draw to motor rating plate. Fan Models: Follow these instructions for replacement of the fan guard,

fan motor or fan blades.

1. If the heater is installed, turn off the gas and disconnect the electric power.

2. Remove the left outer side panel (left when facing the rear of the unit). Disconnect the fan motor wires.

3. Depending on the date that the heater was manufactured, it will have either a lower-half fan guard only, two-piece full fan guard, or a onepiece full fan guard. If the unit has a two piece fan guard, remove the tension mounted upper half fan guard and the four screws that hold the lower half. If the unit has a one-piece fan guard, remove all of the screws that retain the fan guard. Remove the assembled parts (the fan guard, the motor and the fan blade).

4. Disassemble and replace whatever parts are needed and reassemble using whatever part(s) are being replaced and the original parts. If the fan guard is being replaced, it is important that the same hardware be used for attaching the motor to the fan guard as was used with the original guard. These screws are especially made to cut through the coating on the fan guard to provide adequate grounding for the motor.

35. Flash Carryover

See Figure 32. The burner carryover system receives its gas supply from the main burner ports. Check the carryover assembly and also the main burner ports for cleanliness. Clean with air pressure.

Flash Carryover

Figure 32 -

Burner

Rack Flash

Carryover

Figure 33 Proper Position of the Fan Blade on the Motor Shaft

Be sure the fan blade is in proper position on the shaft. Position the fan as shown in Figure 33 according to the chart on the right.

Fan Motor

Model Set Screw “A” Hub to

Size Torque In-Lbs Motor

25 80 + or - 10 1-1/4" (32mm) 50 80 + or - 10 3/8"(10mm)

75 80 + or - 10 1/8" (3mm) 100-125 120 + or - 10 2-1/2" (64mm) 165-400 150 + or - 10 2-1/2" (64mm)

Mfg P/N 98807 Rev 8, Page 25

Fan Hub

37. Fan (cont'd)

Position the assembly on the heater. Attach the fan guard at the center mounts. (IMPORTANT: If replacing the fan guard, use the screws that held the original fan guard. These specially designed screws will cut through the coating on the fan guard to provide a ground for the fan motor.)

Rotate the fan blade to check for adequate clearance. If adjustment is required, loosen the mounting screws, re-position the fan guard, and tighten the screws. Rotate the fan blade and re-check for adequate clearance. Repeat this procedure until the assembly is positioned properly.

5. If necessary, drill the required upper and lower fan guard mounting holes. Attach the fan guard at all upper and lower mounting points using either the screws removed or field-installed sheet metal screws.

6. Reconnect the fan motor wires and replace the outer side panel.

7. Restore power to the heater and turn on the gas. Light, following the instructions on the lighting instruction plate. Check for proper operation.

38. Venter Motor

Remove dirt and grease from the motor housing. Power venter motor is permanently lubricated.

The vent relay controls the venter motor. If the relay contacts fail to close the venter motor will not run. If the relay contacts fail to open, the venter motor will not shut off, preventing the combustion air pressure switch from opening.

39. Operating Gas Valve

The gas valve requires no field maintenance except careful removal of external dirt accumulation and checking of wiring connections. Instructions for testing pressure settings are in Paragraph 10.

CAUTION: The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting to the unit to ensure positive closure. See Hazard Levels, page 2.

40. Fan and Limit Controls

If it is determined that the fan or limit control needs replacing, use only factory-authorized replacement parts that are designed for your heater.

Instructions for replacing fan or limit control:

1. Turn off the electric power and shut off the gas supply.

2. Remove the outer left side panel (left when facing the back of the unit). Remove the access panel. (See Figure 34.)

3. Remove defective controls and install new controls in the same mounting holes. Use only factory-authorized replacement parts.

4. Replace access panel and side panel.

5. Turn on the electric power and the gas supply.

6. Relight following the lighting instructions on the heater.

Figure 34 Access to Controls

Remove Control Access Panel

41. Vent System

Check the vent system at least once a year. Inspection should include all joints, seams, and the vent cap. Replace any defective parts.

Limit Control

Fan Control

Form 436, Page 26

42. T roubleshooting

TRO U B LE PRO BAB L E C AU S E REMEDY Vente r motor will not start

Pilot will not light 1. (spark ignitio n 2. system) 3.

No power to unit.

No 24 volt power to venter relay.

Vent er relay defect ive.

Defect ive m oto r o r cap acit or.

Manual valve not open. Air in gas line. Dirt in pilot o r ifice.

Gas pressure too high or too low.

Kinked pilot tubing.

Pilot valve does not open.

No spark:

Loose wire connect ions

T ransformer failure.

Inco rr ect spark gap.

Spark cable shorted t o ground.

Spark electrode shorted t o ground.

Draft s affecting pilot.

Turn on power, check supply fuses, or circuit breaker. If unit is equipped with

unit-m o unt ed disconn ect switch , ch eck circuit breaker ( See Paragraph 11).

T urn up therm ostat ; ch eck co n trol transfo rm er o ut p ut.

Replace relay.

Replace motor o r cap acit or.

Open m an ual valve.

Bleed gas line.

Remove an d clean with compressed air o r solven t (do no t ream ).

Adjust supply pressure. (See Paragraph 10).

Replace tubing.

If 24 v olt av ailable at valve, replace valve.

Be certain all wires conn ections are solid.

Be certain 2 4 v olts is available.

Maint ain spark gap at .100".

Replace wo r n o r grounded sp ar k cable.

Replace pilot if cer am ic spark electrode is cracked or grounded.

Make sure all panels are in place and tightly secured to pr ev en t drafts at pilot.

g) h)

circuit by above causes.

Pilot lights, main 1. valve will not open 2. (Spark Ign itio n system)

No heat (Heater 1. O perating) 2.

Cold air de livered 1. On Start- up 2. During O pera tion 3. Motor will not run 1.

Motor turns o n 1. and off whil e 2. burner is operating (See motor cuts o ut on overload 4. below) 5.

Fan m otor cuts 1. out on overload 2.

Blower motor 1. cuts o ut on

overload 3.

3. a) b)

continues)

d) e)

exchan ger t ube. Surface con tact is required.

causing false cycling.

Ignition control not grounded.

Faulty ignition cont roller.

Optional lockout device interrupt ing cont rol

Faulty combustion air proving switch.

Manual valve not open. Main valve not operat ing.

Defect ive v alv e.

Loose wire connect ions.

Ignition control does not power main valve. Loose wire connect ions. Flame sensor grounded. (Pilot lights - spark

Gas pressure in co r rect.

Cracked ceramic at sensor.

Faulty ignition cont roller.

Inco rr ect man ifo ld pressure or o r ifices. Cycling on limit c ontrol. Improper thermostat location or adjustment. 3. See thermostat man ufact urer's instructio n s. Fan control improperly wired Defect ive f an co n trol. Incorrect manifold pressure. Circuit open. Fan control inoperative. Defect ive m oto r o r cap acit or.

Fan control improperly wired.

Defect ive f an co n trol.

Po or con tact between fan co n tro l and heat

Motor overload device cycling on and off.

Low ambient t emperature (less than 4 0

Low or high voltage supply .

Defect ive m oto r .

Poor air flow.

Defect ive bearing or lubricatio n .

Improper motor pulley and/or adjustment.

Imp roper static pressure i n th e duct system.

Low voltage.

Make certain ignition co ntr o l is grounded to furnace ch assis

If 24 volt is available to ignition controller and all ot her causes have been

eliminated, rep lace ignition co n trol.

Reset lockout by int errupt ing cont rol at thermostat.

Replace combustion air pro v ing switch.

Open m an ual valve.

If 24 v olt is measured at valv e co n n ections and valve r em ain s closed, replace

valve.

Check and t ight en all wiring conn ections.

Be certain flame sensor lead is not grounded or insulation or ceramic is not

cracked. Replace as required.

Set supply pressure at 5" w.c. to 14" w.c. for natural gas and 11" w.c. to 14"

w.c. for propane gas.

Replace sensor.

See Paragraph 33. If all check s indicate no ot her cause, replace ign ition

contro ller. DO NOT ATTEMPT TO REPAIR IGNIT ION CONTROLLER. T HI S DEVICE HAS NO FI EL D REP L ACEABLE P ARTS.

Check manifold pressure (See Paragraph 10).

Check air t h r o ughput (See Paragraph 15).

Connect as per wiring diagram.

Replace fan con trol.

Check man ifo ld line pressure (See P ar agraph 1 0 ) .

Check wiring and connections. .

Replace fan con trol.

Replace motor o r cap acit or.

Connect as per wiring diagram.

Replace fan con trol.

Check for bent mounting or loose mounting screws.

Check mo tor load against mo tor r ating plate. Replace moto r if n eeded.

Install fan delay relay kit (See Paragraph 17.)

Correct electric supply .

Replace motor.

Clean moto r, fan and fan guard.

Lubricate bearings or replace mo tor .

See instruct ions in P aragraph 14.

Adjust duct sy ste m damp e rs.

Check power supply.

Mfg P/N 98807 Rev 8, Page 27

FOR SERVICE OR REPAIR, FOLLOW THESE STEPS IN ORDER:

FIRST: Contact the installer.

Name _______________________________________________________________________________________

Address ________________________________________________________________________________________

________________________________________________________________________________________

Phone ________________________________________________________________________________________

SECOND: Contact the nearest distributor (See telephone Yellow Pages.)

THIRD: Contact: REZNOR

150 McKinley Avenue Mercer, PA 16137 Phone: (724) 662-4400

Model No. ______________________________________________________________________________________________

Unit Serial No. __________________________________________________________________________________________

Date of Installation _______________________________________________________________________________________

/Thomas & Betts Corporation

Form 436, Page 28

marks are the property of their respective organizations. MANUFACTURER OF GAS, OIL, ELECTRIC HEATING AND VENTILA TING SYSTEMS 999 10M YL Form 436 (Version A.8)

Thomas & Betts FE, BE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual