Reznor OH Installation & Operation Manual
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Reznor OH Installation & Operation Manual

Reznor OH Installation & Operation Manual

Oil-fired unit heater
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Installations in the
United States
The use and storage of gasoline or other flammable vapors and liquids in open
containers in the vicinity of this appliance is hazardous.
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.
�
Model OH,
Oil-Fired Unit Heater
FOR YOUR SAFETY
WARNING
Obsoletes Form I-OH (Version B)
Installation/Operation/Maintenance
���
Installations in Canada
Form I-OH (Version C)
Applies to: Model OH
Form I-OH, PN 120390 R4, Page 1

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Summary of Contents for Reznor OH

  • Page 1 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. Form I-OH, PN 120390 R4, Page 1...

  • Page 2: Table Of Contents

    The instructions in this manual apply to Reznor Model OH, Oil-Fired Unit Heater. Model OH has a propeller fan for air delivery and requires a vent with a barometric draft regulator.

  • Page 3: General Information

    In Canada, the installation must be in accordance with CSA Standard B139, Installa- tion Code for Oil Burning Equipment; CSA Standard C22.1, Canadian Electric Code, Part 1; and with requirements of local regulatory authorities. Model OH units for instal- lation in Canada have a CSA logo on the rating plate.

  • Page 4: Throw

    2.2 Throw TABLE 1 lists air throw of a Model OH heater installed at 9-foot (2.7M) mounting height. TABLE 1 - Throw of a OH Size heater installed at 9-ft...

  • Page 5: Dimensions

    For clearances and dimensions, refer to Paragraph 4. TABLE 4 - Unit Weight Model OH Net Weights - lbs (kg) Size 5.2 Hanging the Use four 1/2" diameter threaded rods. Lock threaded rod using a washer and nut as Heater shown in FIGURE 3A.

  • Page 6: Mounting The Heater

    Heater tank. Follow the instructions shipped with the stand to assemble the parts. Set the Model OH heater on the stand to create a unified structure. Follow the stand instructions to secure the unit. 6.1 Fuel Tank and Supply Lines 6.
  • Page 7 1/16" bypass plug (Shipped with the burner pump; see FIGURE 17, page 17.). Attach the inlet and return lines. Always terminate the return line 3 to 4 inches (76 to 102mm) above the supply line inlet. See FIGURE 5. Form I-OH, PN 120390 R4, Page 7...
  • Page 8 FIGURE 5 - Two-Pipe Supply TABLE 6 - Maximum Horizontal System (standard 1-stage or Supply Line Length with Two-Pipe optional 2-stage burner pump) Supply System (ft/M) - All OH Sizes Maximum Horizontal Supply Line Length for Two-Line System (Supply and Return) ��� Lift...
  • Page 9 Maximum Height from Boost Pump to Burner -- 35 feet (10.7M). TABLE 7A - Maximum Horizontal Length from Boost Pump to Burner(s) 1/2" OD Tubing 1/2" Pipe 3/4" Pipe Boost Pump Option DA1 53.3 91.4 1800 548.6 Option DA2 15.2 30.5 182.9 Form I-OH, PN 120390 R4, Page 9...
  • Page 10 Pressurized piping systems must not exceed 3 psi. An oil solenoid valve (Option DD1) is recommended at each unit to prevent seal damage should the pressure for any rea- son exceed the maximum of 3 psi. Form I-OH, PN 120390 R4, Page 10...

  • Page 11: Venting And Combustion Air

    For the vent connection from the flue outlet of the heater to the chimney, use vent pipe of either 24-gauge or heavier galvanized steel or triple-wall stainless steel. For Sizes Form I-OH, PN 120390 R4, Page 11...

  • Page 12: Draft Regulator

    When a draft inducer is installed, a safety provision must be made to shut off the fuel supply to the burner in the event of the failure of the draft inducer. See optional exhaust flow safety switch on the wiring diagram. Form I-OH, PN 120390 R4, Page 12...

  • Page 13: Electrical Supply And Connections

    14 gauge or larger, depending on current requirements, for line connections. TABLE 8 - Electrical Total Current Minimum Circuit Minimum Amperes Ampacity Fuse Size Ratings, 115V, 60 Hz Size Form I-OH, PN 120390 R4, Page 13...

  • Page 14: Wiring Diagrams

    Connections (cont'd) FIGURE 13 - Typical Wiring Diagram for Model OH with a UL Logo, W.D. 119645 FIGURE 14 - Typical Wiring Diagram for a Model OH with a CSA Logo, W.D. 228148 Form I-OH, PN 120390 R4, Page 14...

  • Page 15: Major Components

    Do not use easy flow bleed valve port. The easy flow bleed valve port contains pressure higher than operating pressure. Setting pump pressure with gauge in the easy flow bleed valve port results in WRONG operat- ing pressure. Form I-OH, PN 120390 R4, Page 15...
  • Page 16 Fan and Limit Circulating Air FIGURE 18 - Access Control Assembly High Limit and Identification of the Fan and Limit Controls Super Limit Control Remove plate to access fan and limit control assembly. Form I-OH, PN 120390 R4, Page 16...

  • Page 17: Control Wiring

    1-1/2 times the maximum working pressure but not less than 5 pounds per square inch at the highest point of the system. The test shall be made so as not to impose a pressure Form I-OH, PN 120390 R4, Page 17...

  • Page 18: Check-Test-Start (Operating Procedure)

    2) The air shutter was preset at the factory. Verify the air shutter setting on the burner with the chart in FIGURE 21. All other controls should be in normal position. 3) Turn off the electrical power. 4) Set the thermostat to above room temperature. Form I-OH, PN 120390 R4, Page 18...

  • Page 19: Ignition Control

    □ Check combustion air shutter and air band settings. The heater is shipped from the factory with the settings shown in the table in FIGURE 21. Ordinarily, Form I-OH, PN 120390 R4, Page 19...

  • Page 20: Maintenance And Service

    Instructions for removing soot from the combustion chamber/heat exchanger On the burner end of the heater, locate the small exhaust door panel underneath the burner tray. See FIGURE 22. On Canadian Models, there is a screw (not shown Form I-OH, PN 120390 R4, Page 20...
  • Page 21 With the panel removed, the access door cover is exposed a shown in Access Cover FIGURE 24. Outer Door Panel Removed Exposing the Inner Combustion Chamber /Heat Exchanger Be sure to provide sufficient support Access Cover for this large panel when removing it. Form I-OH, PN 120390 R4, Page 21...
  • Page 22 End of Heater and 1) Remove three nuts attaching Burner Removal burner mounting plate. Instructions 2) Slide burner tube out and rotate. 3) Use service tray to support burner. Burner Mounting Plate (Replace gasket if deteriorated.) Form I-OH, PN 120390 R4, Page 22...
  • Page 23 Refer to FIGURE 29. before cleaning the Use a stiff brush and a shop vac to clean the accumulated dust and dirt from the exte- heater. rior surface of the combustion chamber and the heat exchanger. Form I-OH, PN 120390 R4, Page 23...

  • Page 24: Troubleshooting

    7. Motor operates but does not drive the pump shaft. 7. Check the coupling for slippage due to stripped end caps. Replace coupling. 8. Frozen oil pump shaft 8. Replace oil pump. 9. Suction line oil filter cartridge dirty 9. Replace cartridge. Form I-OH, PN 120390 R4, Page 24...
  • Page 25 4. If the problem is not apparent, check the primary control system. Measure the electrical voltage at the primary input (usually black) and neutral lead (usually white) connections. Jumper the thermostat (TT terminals) or otherwise energize the primary control. Form I-OH, PN 120390 R4, Page 25...
  • Page 26 See FIGURE 18, page 16. been added ? covered with dirt? Clean the heat Remove ducts or exchanger and fan. deflector from heater. See Paragraphs 9.2.1 and .4. Form I-OH, PN 120390 R4, Page 26...

  • Page 27: Index

    11 Fuel Specifications 3 Venting 11 Fuel Tank 6 Warranty 3 GENERAL 2 Weight 5 Supply and Line Wiring 13 Hanging the Heater 5 Wiring Diagrams 14 Hazard Labels 2 Installation Codes 3 Form I-OH, PN 120390 R4, Page 27...
  • Page 28 BUILDING OWNER OR MAINTENANCE PERSONNEL: For service or repair • Contact the installer listed above. • If you need additional assistance, contact the Reznor Distributor listed above. • For more information, contact your Reznor Representative by calling 800-695-1901. Reznor/Thomas & Betts 150 McKinley Avenue Mercer, PA 16137 www.RezSpec.com...

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