54
4. Operational Check:
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CAUTION: Before troubleshooting, familiarize yourself with the start up and
check out procedures
NOTICE: After reassembling the appliance, check for fuel oil leakage from the
supply piping.
a. Check proper operation of the ignition system and for proper combustion.
b. Observe the main burner flame. If the flame appears strange or abnormal in character, look for a
component or components that were not reassembled correctly. If the components have been
reassembled correctly, check for a blocked vent, malfunctioning combustion air blower or fuel pump,
and partially blocked burner nozzle.
D. ELECTRICAL SYSTEM:
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WARNING: When servicing controls, label all wires prior to disconnecting.
Correctly reconnect any wires removed during servicing. Wiring errors can cause
improper and dangerous operation. Dangerous operation can result in injury or
damage.
1. Check all wiring for loose connections and any signs of damage, or unusual wear. Replace any
damaged or frayed wiring and tighten any loose connections.
2. Use a voltmeter, or a multimeter, to check for adequate voltage at the field connections when the
appliance operating.
3. Use an ammeter, or a multimeter, to check the current draws of the blower motor and burner assembly,
to assure they are not exceeding rating label current specifications for each component. Also, refer to
Table 10 in the electrical wiring section of this manual for electrical specifications on these components.
4. Check for correct operation and proper settings (if manually adjustable) of all controls.
E. SUPPLY/RETURN AIR BLOWER:
Check in the blower compartment for dust, dirt, debris, and for the presence of insects. Remove any
foreign material. Clean the blower wheel, housing, and compartment of dust and lint with a vacuum.
The blower motor has sealed bearings that are permanently lubricated.
The
blower motor bearings do
not require oil or any type of additional lubrication.
F. SUPPLY/RETURN AIR FILTER:
The filter rack will be located between the return air plenum and the return air opening on the side of the
furnace. This filter should be inspected regularly. When the filter is dirty, it should be cleaned or replaced
to assure proper heating/cooling system operation. Follow the cleaning, removal and replacement
procedure below.
Filter maintenance procedure:
Shut off the electrical power to the unit. Open the access door. Slide the air filter out of the filter rack.
Clean the filter by either vacuuming, rinsing with tap water, hosing, or dipping in an ordinary detergent
solution. After cleaning and drying the filter, replace the completely dry filter in the rack. If the filter has a
supporting mesh, the mesh side of the filter must be placed towards the furnace.
Summary of Contents for Thermo Pride OH6FA072D48B
Page 5: ...2...
Page 33: ...30 Heating Speed Set ups 2 Stage OH6FX072DV4 Figure 18 2 ECM 2 stage blower motor speed chart...
Page 64: ...61 VIII Sequence of Operations Flow Chart...
Page 65: ...62...
Page 66: ...63 IX Trouble Shooting Flow Chart...
Page 67: ...64...
Page 68: ...65...
Page 69: ...66...
Page 70: ...67...
Page 72: ...69 Appendix A Replacement Parts Replacement Parts for OH6FA072D...
Page 73: ...70 Replacement Parts for OH8FA119D...
Page 74: ...71 Appendix B Wiring Diagrams OH6FA072D48 PSC Wiring Diagram...
Page 75: ...72 OH6FA072DV4 ECM Wiring Diagram...
Page 76: ...73 OH6FX072DV4 ECM 2 Stage Wiring Diagram...
Page 77: ...74 OH8FA1119D60 PSC Wiring Diagram...
Page 78: ...75 OH8FA1119DV5 ECM Wiring Diagram...
Page 79: ...76...
