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OIL-FIRED UNIT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
• Failure to follow safety warnings exactly could result in serious injury or property damage.
• Installation and service must be performed by a qualified installer, service agency, or the gas
supplier.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas suppliers
instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
MODEL OH
⚠ WARNING ⚠
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: I-OH (01-20) PN120390R7
Supersedes: I-OH (07-16) PN120390R6
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Table of Contents
Troubleshooting
Related Manuals for Reznor OH
Summary of Contents for Reznor OH
- Page 1 Revision: I-OH (01-20) PN120390R7 Supersedes: I-OH (07-16) PN120390R6 OIL-FIRED UNIT HEATER INSTALLATION, OPERATION, AND MAINTENANCE MODEL OH ⚠ WARNING ⚠ FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury or property damage. • Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
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Page 2: Table Of Contents
Outside Combustion Air Intake Adapter Kit (Option DE1, Shipped Separately) ........17 Electrical Connections............................18 Electrical Connection Requirements ......................18 Electrical Connections for Optional Equipment ..................18 Supply and Line Wiring ..........................18 Wiring Diagrams.............................19 Electrodes and Nozzle ...........................20 Thermostat Wiring ............................21 I-OH (01-20) PN120390R7... -
Page 3: References
Table 1. Related Technical Manuals Available from Factory Distributor Type Form Replacement parts P-OH 272437 Replacement fan/blower controls and limit controls P-FAN&LIMIT 147678 Optional draft booster relay installation I-OIL-DBR 110781 Optional vertical louver installation I-OIL-VL 122408 Also available at www.reznorhvac.com. I-OH (01-20) PN120390R7... -
Page 4: General Information
GENERAL INFORMATION The instructions in this manual apply to yhe Reznor model OH oil-fired unit heater, which has a propeller fan for air delivery and requires a vent with a barometric draft regulator. This unit has been tested for capacity and efficiency so as to provide many years of safe and dependable comfort providing it is properly installed and maintained. -
Page 5: Fuel Specifications
• Unit size 190 burns an average of 1.65 gallons per hour. Installation Codes In the US: model OH units intended for installation in the US have a UL logo on the rating plate. In the US, the installation must be in accordance with the following: •... -
Page 6: Clearances
Flue Pipe Required Clearance (Inches (mm)) 2 (51) 48 (1219) 18 (457) 24 (610) 6 (152) 18 (457) Dimensions Figure 1 Table Dimensions for the unit are shown in and listed in Figure 1. Dimensions (Refer to Table I-OH (01-20) PN120390R7... -
Page 7: Weights
Narrow Building - Single units arranged to compensate for heat loss from four exposed outside walls. Wider Building - Single units arranged to compensate for heat loss from four exposed outside walls. Figure 2. Recommended Heater Arrangements I-OH (01-20) PN120390R7... -
Page 8: Unpacking Unit
Immediately upon uncrating the unit, check for any damage that may have occurred during shipping. If any damage is found, immediately document the damage with the transporting agency and contact an authorized Reznor Distributor. If you are an authorized Distributor, follow the FOB freight policy procedures as published by Reznor, LLC. Unit Mounting ⚠... -
Page 9: Optional Heater Stand Mounting
• Do not cover the piping until the burner has been installed and operated so that any leaks may be detected and corrected. • For connecting the burner to the tank, use at least 1/2-inch iron pipe or 3/8-inch OD copper tubing (1/2-inch OD copper tubing is preferred) having a wall thickness of not less than 0.049-inch. I-OH (01-20) PN120390R7... -
Page 10: Shutoff Valves
• loop and pressurized systems require an additional booster pump for oil delivery and are used when installing more than one heater One-Pipe Supply with Standard Single-Stage Burner Pump • The standard burner is equipped with a single-stage, 3,450-RPM pump with the lift capacity shown in Figure Figure 4. One-Pipe Supply System I-OH (01-20) PN120390R7... -
Page 11: Two-Pipe Supply With Standard Single-Stage Burner Pump Or Optional Two-Stage Pump
Terminate return line 3 to 4 inches (76 to 102 mm) above supply line inlet. Figure 5. Two-Pipe Supply System • Refer to Table 7 for the maximum horizontal line (return and supply) length with a two-pipe supply system. I-OH (01-20) PN120390R7... -
Page 12: Loop System
3 psi at the first burner supplied. Figure 6. Loop Supply System for Multiple-Unit Installations • The boost pump supplies fuel oil in excess of burner requirements from the supply tank to individual heaters. The fuel oil is returned to the supply tank. I-OH (01-20) PN120390R7... -
Page 13: Pressurized System
• The complete assembly with the motor is approximately 15 inches long × 7-1/2 inches high × 6-3/4 inches wide Figure (381 × 191 × 171 mm). The dimensions for the boost pump mounting bracket are shown in Boost Pump Bracket Boost Pump Mounting Dimensions (Bottom View) Figure 8. Boost Pump and Mounting Bracket I-OH (01-20) PN120390R7... - Page 14 64 ( 49 ( 24 ( 100 ( 100 ( 65 ( 100 ( 100 ( 100 ( 13.4 10.4 30.4 14.6 30.4 27.4 19.8 Continuous Operation (Loop System) Intermittent Operation (Pressurized System) Figure 9. Boost Pump Wiring I-OH (01-20) PN120390R7...
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Page 15: Boost Pump Pressure Switch (Option Df1, Shipped Separately)
• Existing masonry or metal chimney: before installing the heater, clean and inspect the chimney. Make any necessary repairs and ensure that the chimney meets all requirements. • Approved factory-built chimney: ensure that it meets all requirements and install it according to the manufacturer’s instructions. I-OH (01-20) PN120390R7... - Page 16 • Vent pipe connection inside chimney: the end of the vent pipe connection must not extend past the inside wall of the chimney. A thimble may be used in the chimney connection to facilitate removal for cleaning. The thimble should be permanently cemented in place with high-temperature cement. I-OH (01-20) PN120390R7...
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Page 17: Barometric Draft Regulator (Option Db1)
• A UL-listed outside combustion air intake adapter kit (option DE1) is available to provide outside air for combustion. • Option DE1 is not available for Canadian installations. • See Figure 11 for installation and follow the manufacturer’s instructions furnished with the kit. I-OH (01-20) PN120390R7... -
Page 18: Electrical Connections
#14 gauge or larger for line connections depending on current requirements. • Refer to Table 9 for unit electrical ratings (115V, 60 Hz). Table 9. Electrical Ratings Unit Size Total Current Amperes Minimum Circuit Ampacity Minimum Fuse Size 140, 190 I-OH (01-20) PN120390R7... -
Page 19: Wiring Diagrams
Wiring Diagrams • See Figure 12 for a typical wiring diagram for UL-listed models. • See Figure 13 for a typical wiring diagram for CSA-listed models. Figure 12. Typical Wiring Diagram for UL-Listed Model I-OH (01-20) PN120390R7... -
Page 20: Electrodes And Nozzle
• It is important that electrode adjustment is checked prior to firing the unit. However, they should be checked at time of installation to ensure that they are still set as shown in Figure • Adjust the electrodes as necessary in accrdance with the Service Oil Nozzle and Spark Electrodes section. I-OH (01-20) PN120390R7... -
Page 21: Thermostat Wiring
• DO NOT install the thermostat on or directly suspend from the heater. • DO NOT install the thermostat on a cold, outside wall. • For specific connection details and instructions on setting the heat anticipator, refer to manufacturer’s instructions provided with the thermostat. I-OH (01-20) PN120390R7... -
Page 22: Operation
Burner Pump Pressure Adjustment section for pressure check instructions. • Refer to Burner Pump Vacuum Adjustment section for vacuum check instructions. • See Figure 15 for port, bleed, inlet, regulator, and bypass plug locations. Figure 15. Burner Pump I-OH (01-20) PN120390R7... -
Page 23: Fan And Limit Controls
‰ Check clearances: ensure that clearances are in accordance with Table ‰ Check hangers: ensure that all hangers are adequately anchored and that all unions or threaded fittings are snug and do not rotate under conditions of vibration. Heater must be level. I-OH (01-20) PN120390R7... -
Page 24: Startup Checklist
Wait 3 to 4 minutes between pushes of reset button to allow internal bimetal strip to cool down. Pump runs for 45 seconds each time. i. After all air is bled from line, close bleeder valve and turn OFF main power. I-OH (01-20) PN120390R7... - Page 25 To measure overfire draft, remove metal plug in observation door (see Figure 18). Observation Door Air Shutter Air Band Figure 18. Combustion Air Band and Air Shutter b. Insert air pressure gauge such as Dwyer pressure gauge and observer reading on gauge. I-OH (01-20) PN120390R7...
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Page 26: Adjustments
Pressurized or gravity feed installations must not exceed 3 psi on inlet line or return line at the pump. A pressure greater than 3 psi may cause damage to the shaft seal. • Connect gauge to the gauge port or the nozzle port (see Figure 15) to check burner pump pressure. I-OH (01-20) PN120390R7... -
Page 27: Burner Pump Vacuum Adjustment
Exhaust box cover (see Figure 19, DETAIL B) is now in view. 3. Remove nuts that secure exhaust box cover and pull cover directly forward off welded studs. Heat exchanger tubes (see Figure 19, DETAIL C) are now in view. I-OH (01-20) PN120390R7... - Page 28 Heat Exchanger Passages DETAIL A DETAIL B DETAIL C Figure 20. Combustion Chamber/Heat Exchanger 8. Remove woven gasket material. NOTE: If a furnace brush is not available, a cleaning rake may be fabricated as shown in Figure I-OH (01-20) PN120390R7...
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Page 29: Clean End Cone
5. With burner on service tray, remove screws that secure end cone to burner tube and remove end cone. 6. Check end cone for deterioration and replace if deterioration exists. Otherwise, clean end cone using stiff wire brush. I-OH (01-20) PN120390R7... -
Page 30: Service Oil Nozzle And Spark Electrodes
Check electrodes for deterioration and insulators for cracks or damage. Replace electrode assemblies if any damage or deterioration exists. Otherwise, remove any carbon formation on spark electrodes. b. After service or replacement, check position of electrodes and adjust electrode location precisely as shown Figure 5. Re-install fuel line assembly. I-OH (01-20) PN120390R7... -
Page 31: Clean Exterior Surfaces Of Combustion Chamber/Heat Exchanger And Clean Fan Assembly
‰ Electrical test meter that can measure volts, ohms, and amps ‰ Ignition transformer tester ‰ Combustion analyzer kit to measure oxygen, carbon dioxide, smoke, stack temperature, draft, and system efficiency ‰ Pressure/vacuum gauge with a scale of 0–200 psig and 0–30 inches Hg I-OH (01-20) PN120390R7... -
Page 32: Oil Burner Troubleshooting
7. Motor operates but does not drive pump Check coupling for slippage due to stripped end caps; replace as coupling shaft necessary 8. Frozen oil pump shaft Replace oil pump 9. Dirty suction line oil filter cartridge Replace suction line oil filter cartridge I-OH (01-20) PN120390R7... - Page 33 4. Oil carbonization on burner endcone Check nozzle location relative to inside radius of endcone 5. Downdraft causing smoke to enter building Increase draft by extending chimney height or by adding ventilating cap or through barometric draft regulator draft inducer I-OH (01-20) PN120390R7...
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Page 34: Primary Control Troubleshooting
If the primary control relay pulls in, but the motor fails to start, measure the voltage between the neutral lead and the primary control lead for the motor. A severe voltage drop here would indicate that the relay switch contacts are defective. Replace the primary control. I-OH (01-20) PN120390R7... -
Page 35: High Temperature Limit Troubleshooting
Have ducts or exchanger surfaces controls assembly. air deflectors and/or the fan blades been added ? covered with dirt? Clean the heat Remove ducts or exchanger and fan. deflector from heater. Figure 24. High Temperature Limit Troubleshooting Flowchart I-OH (01-20) PN120390R7... - Page 36 If you need additional assistance, contact the Distributor listed above. PERSONNEL: • For more information, contact your Factory Representative. Canadian Installations US Installations Specifications and illustrations subject to change without notice or incurring obligations. ©2020 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved. I-OH (01-20) PN120390R7...
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