Form I-OH (Version C) Obsoletes Form I-OH (Version B) Installation/Operation/Maintenance Applies to: Model OH Model OH, Oil-Fired Unit Heater Installations in the United States Installations in Canada 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.
Table of Contents 1. General........................................................... 2 6. Mechanical..................................................... 6 1.1 Hazard Labels and Notices............................. 2 6.1 Fuel Tank and Supply Lines........................... 6 1.2 General Information......................................... 3 6.2 Venting and Combustion Air..........................11 1.3 Warranty........................................................... 3 7.
1.2 General Information Fuel Specifications The burner in this oil-fired heater is designed and orificed for use with #2 fuel oil (140,000 BTU/gallon) at 100 psig. However, the following substitute fuels may be used: #1 fuel oil - 132,000 BTU/gallon Kerosene (domestic only; do not use foreign) - 132,000 BTU/gallon #1 diesel fuel - 132,000 BTU/gallon (see NOTE) #2 diesel fuel - 140,000 BTU/gallon (see NOTE) NOTE: Diesel fuel is not approved for use in Canada.
2. Location (cont'd) 2.1 Arrangement (cont'd) FIGURE 1 Recommended Arrangements 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. 2.2 Throw TABLE 1 - Throw of a heater installed at 9-ft (2.7M) TABLE 1 lists air throw of a Model OH heater installed at 9-foot (2.7M) mounting height. OH Size 95 140 190 50 ft 65 ft 65 ft Throw 15.2M 19.8M 19.8M 3.
4.2 Dimensions FIGURE 2 - Model OH Dimensions TABLE 3 - Dimensions (inches/mm) Size 95 140 and 190 inches A B C D 8 17-3/8 33 7 203 441 838 178 inches 9-1/2 37-3/8 43 8 241 1092 203 mm mm 949 5. Suspension or Mounting TABLE 4 - Unit Weight 5.
5. Suspension or Mounting (cont'd) 5.2 Hanging the Heater (cont'd) 5.3 Mounting the Heater If ordered with an optional workbench fuel tank (Option OT) and heater stand (Option HS), follow the recommendations with the tank and in Paragraph 6.1 for positioning the 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. Mechanical 6.
part of a burner, connect a pressure relief valve into the discharge line between the pump and the shutoff valve and arrange to return surplus oil to the supply tank or to bypass it around the pump, unless the pump includes an internal bypass. Any fuel oil line incorporating a heater shall be provided with a relief valve arranged to discharge to the return line when any valve, pump, or other device may prevent the release of excessive pressure because of the expansion of the oil when heated.
6. Mechanical (cont'd) 6.1 Fuel Tank and Supply Lines (cont'd) 6.1.
All manifold and feeder lines must run in a horizontal plane at an elevation above the fuel intakes of the units. Extend feeder lines downward to fuel burner intakes. 6.1.4 Pressurized System A pressurized system is one in which a boost pump is used to supply fuel oil to a manifold for which branch lines supply each heater. The end of the manifold is capped, and the system is operated at a pressure not exceeding 3 psi at the first burner supplied.
6. Mechanical (cont'd) 6.1 Fuel Tank and Supply Lines (cont'd) 6.1.
6.1.6 Optional Solenoid Valve (Option DD1, shipped separately) Use of the optional solenoid valve is recommended with the pressurized oil delivery system (Paragraph 6.1.4). It is designed to operate simultaneously with the burner motor. 6.1.7 Optional Oil Safety Valve (OSV) (Option DC1, shipped separately) The oil safety valve is opened by the slight vacuum created by the burner pump and closes when the vacuum condition subsides.
6. Mechanical (cont'd) 6.2 Venting and Combustion Air (cont'd) 6.2.1 Venting (cont'd) 140 and 190 use 8" diameter pipe; for Size 95, use 7" diameter pipe. Keep the length of the vent pipe connection as short and direct as possible. As it leaves the heater, slope the horizontal run upward at least one inch for each three feet of pipe. The horizontal run should not be longer than one-half of the vertical or chimney height and never over ten feet (3M) unless a draft inducer is being installed.
6.2.2 Combustion Air WARNING: Exercise care to ensure that an adequate supply of combustion air is available and free to enter the air openings on all units. Openings equal to one inch square per each 1,000 BTUH should be used to allow combustion air to enter the room where the heater is installed. Optional Outside Combustion Air Intake Adapter Kit, UL Listed, Option DE1 (shipped separately) (Not available for Canadian installation.) The combustion air adapter will provide outside air for combustion.
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 R5, Page 14 7.3 Wiring Diagrams 115/1/60 7.
7.4 Major Components TABLE 9 - Electrical Characteristics of Motors Motors - See electrical characteristics in TABLE 9. The fan motor is totally enclosed and is equipped with internal overload protection. Motor Size HP Volts Amps RPM 95 1/8 115 2.7 1050 Fan 140, 190 1/4 115 3.7 850 140, 190 3/4 115 11 1725 Std 1-Stage Burner Pump 1/7 115 2 3450 95, 140, Opt 2-Stage Burner Pump 1/7 115 2 3450 190 Optional Boost Pump 1/8 115 5.
7. Electrical Supply and Connections (cont'd) 7.4 Major Components (cont'd) FIGURE 17 Burner Pump CAUTION: 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. Vacuum Check - A vacuum gauge may be installed on either side of the 1/4" inlet ports or in the 1/8" return port (on single pipe installation), whichever is most convenient.
The circulating air high limit switch has a nonadjustable setting of 145°F for a Size 95 heater and 160°F for Sizes 140 and 190. The limit control automatically cycles when the internal temperature exceeds those setpoints. For the heater to operate properly and safely, the cause for the temperature exceeding the high limit setpoint must be determined and corrected.
8. Commissioning and Startup (cont'd) 8.1 Checklist Prior to Startup (cont'd) of more than ten pounds per square inch on the tank. This test shall be maintained for at least 30 minutes or for sufficient time to complete a visual inspection of all joints and connections. Instead of a pressure test to check piping, suction lines may be used under a vacuum of not less than 20 inches of mercury maintained for at least 30 minutes. Check vents.
5) The pump will start and the burner ignite. With the burner ignited, check the oil pressure and adjust, if necessary, to a pressure of 100 pounds for Sizes 95 and 140 or 150 pounds for Size 190. FIGURE 19 - Burner Pump FIGURE 20 - Heater Controls Burner Electrical Switch Primary Ignition Control with Reset Button Location of Primary Ignition Control (NOTE: Unit illustration shows older model controller.) Check draft.
8. Commissioning and Startup (cont'd) 8.2 Check-TestStart (Operating Procedure cont'd) these settings will result in a CO2 level shown in the tabled ranges. However, certain field conditions may require a change. In order to determine if the air setting needs to be adjusted, a smoke tester and CO2 analyzer are required.
in the illustration) at the bottom of the panel. Using a straight screwdriver, remove that screw. On all models, remove the outer door panel by lifting upward and outward on the handle. The exhaust box cover is now in view. FIGURE 22 Exhaust Door Panel (Illustration does not show vent pipe. Vent pipe is connected to the collar on the right.) Location of Outer Exhaust Door Panel View with Outer Door Panel Removed Exhaust Box Cover 2. Remove the nuts that hold the exhaust box cover.
9. Maintenance and Service (cont'd) 9.2 Maintenance Procedures (cont'd) 4. Remove the nuts that hold the large inner cover. Pull the cover directly forward off the welded studs, exposing the combustion chamber and heat exchanger passages. Remove the woven gasket material. See FIGURE 25.
4) When cleaning/service is completed, place the mounting plate gasket (NOTE: If gasket is damaged it should be replaced.) on the studs. Align the burner mounting plate with the bolts and slide the tube into the heater. Attach the mounting plate with the three nuts. 5) Reconnect the yellow wires to the ignition controller. WARNING: Turn off electric power before inspecting or cleaning this heater. 9.2.
9. Maintenance and Service (cont'd) FIGURE 29 - Fan Junction Box Located on Rear of Heater. 9.2 Maintenance Procedures (cont'd) Flexible Conduit Connection Junction Box Clean the fan. Use a brush and a shop vac, being careful not to bend or damage the fan blades. Use a shop vac to remove accumulated dirt from the motor. Reattach the fan and the discharge louvers. Connect the flexible conduit and wiring. Check operation.
Symptom(cont'd) Cause (cont'd) Burner motor operates and delivers oil, but there is no flame. Action (cont'd) 1. No spark 1. Measure voltage between transformer/primary lead and neutral connection. Check transformer, insulators and electrodes. The secondary terminals of a good transformer deliver 5000 volts arc to ground, for a total of 10,000 volts between the terminals. Measure this with transformer tester or use a well-insulated screwdriver to draw an arc across the two springs.
9. Maintenance and Service (cont'd) 9.3 Troubleshooting (cont'd) 9.3.1 Troubleshooting the Oil Burner (cont'd) 9.3.2 Troubleshooting Guide - High Temperature Limit Cycles ** The control relay should pull in. If not, make sure that the wiring connections are secure. If wiring connections are secure, check that the cad cell which controls the safety lockout timing on ignition is not seeing too much stray light.
INDEX A L B M Air Shutter Settings 20 Blocked Vent Switch 17 Boost Pump Assembly (Option DA1, DA2) 9 Boost Pump Capacities 9 Boost Pump Pressure Switch 10 Boost Pump Wiring for Constant Operation 10 Boost Pump Wiring for Intermittent Operation 10 Burner Pump 15,19 Burner Pump Lift Capacity 7 C Check-Test-Start (Operating Procedure) 18 Check-Test-Startup Procedure 17 Checklist Prior to Startup 17 Check Valve 11 Cleaning Combustion Chamber, Heat Exchanger and Flue 20 Cleaning End Cone 22 Cleaning Exter
CAUTION: DO NOT TAMPER WITH THE UNIT OR CONTROLS. CALL YOUR SERVICE PERSON.
