Reznor UDBS Unit Installation Manual - Manual (Page 35)

Form I-UDB, P/N 202658 R14, Page 35
10.2 Maintenance
Procedures
10.2.1 Heat
Exchanger
Maintenance
This heater has a
T
CORE
2
® heat exchanger.
Remove any external dirt or dust accumulation. Visually check the heat exchanger for
cracks and holes. If a crack or hole is observed, replace the heat exchanger.
NOTE: Inspection of the lower portion of the heat exchanger is done with the burner
removed. See the Burner Service section below for information on inspecting the lower
portion of the heat exchanger.
FIGURE 22 - Location of
Controls
Flame Sensor Pressure Switch
Limit Control
Venter
Motor
Direct Drive
Blower and
Motor Assy
Burner
Assembly
Ignitor Orifice
Gas
Valve
Door Interlock
(UDBS only)
Terminal Board
Control Switch
(UDBS only)
Electrical Box (UDBS only)
Top View of Control
Bracket Assy located on
the Control Compartment Bottom
Control
Transformer
Ignition
Board
Control Locations - Sizes 30 - 125
Capacitor (located
on the opposite side of
the blower housing)
Flame
Sensor
Limit
Control
Venter Motor
Burner
Assembly
Gas
Valve
Orifice
Ignitor Starter or Contactor
(UDBS location)
Electrical Box (UDBS only)
Door Interlock
(UDBS only)
Terminal Board
Control Switch
(UDBS only)
Blower
Motor
Optional Relays Control Locations - Sizes 150 - 400
Ignition
Board
Pressure
Switch
Capacitor
(Optional)
Top View -
Model UDBS
Control
Bracket Assy
Control Transformer
Control Transformer
Ignition
Board
Capacitor (Optional)
Optional
Relays
Top
View -
Model UDBP
Control
Bracket Assy Control bracket assembly is on the bottom of the control compartment .
Starter or Contactor(UDBP location)
• Check gas valve to ensure that gas flow is being shutoff completely.
• Check the vent or vent/combustion air system for soundness. Clean
openings. Replace any parts that do not appear sound.
• Check the wiring for any damaged wire. Replace damaged wiring.
(See Paragraph 7 for replacement wiring requirements.)