Reznor DV Operation Manual (for units built before August 2003) - Manual (Page 5)

Form O-DV/RDF/ADF, P/N 148385, Page 4
S
S
FIGURE 3 - Circuit
Indicator Board,
P/N 151263
Check bulbs not
lit with other
bulbs; replace
any burned out
bulbs.
Row of Bulbs
6. Main Burner
and Pilot
Assembly
R
MAINTENANCE SECTION (cont'd)
For the most part, the burner and pilot are self cleaning. However, if the appli-
cation is extremely dirty or dusty, cleaning of the burner and pilot may be
necessary. Inspect the burner annually. Follow these instructions. If it is neces-
sary to replace any parts, use only factory-authorized replacements.
1) Turn off the gas and power supply to the system.
2) Remove the door panels in the burner/control cabinet. Locate the pilot.
3) Disconnect the two ignition wires (male and female quick connections)
and disconnect the flame sensor lead at the burner. Remove the setscrew
located in the ignitor tube (setscrew holds the brass bushing in place).
Carefully remove the brass bushing and the ignitor.
Check the hot surface ignitor for cracks or unusual deterioration. Check
the flame rod for integrity. Replace the flame rod (P/N 131188) and/or the
hot surface ignitor (P/N 121865) if not in good condition.
4) Clean the burner and pilot by back-flushing, using high pressure air (40-
80 lbs). Continue until dust particles are completely expelled from both
the upstream and downstream sides of the burner.
If air pressure does not unplug burner orifices or pilot tube, drill burner
orifices with a Size #50 drill and/or pilot tube with a Size #55 drill.
Inspect the upstream and downstream sides of the mixing plates. Remove
any accumulation of scale or foreign material with a wire brush. If any
mixing plate fasteners are loose or missing, tighten or replace. Always use
zinc plated or stainless fasteners.
If any cracks are present, replace that mixing plate. Because of the effect of
flame temperature on the metal, fasteners may be difficult to remove. Be
careful not to damage the gaskets that go between the mixing plates and the
CAUTION: Wear eye
protection while
pressure cleaning and
drilling.
WARNING: Do not
enlarge burner ports or
performance may be
drastically affected.
5. Circuit
Indicator
Board (check
lights)
4. Air Pressure Profile plate sensing tubes should be checked quarterly and cleaned no less
than semiannually. If the sensing tubes become even partially blocked, false
pressure readings may be relayed. To clean, remove the screened end caps.
Clean the screens and the tubes, if necessary. Replace the cleaned end caps.
Check the pressure differential across the profile plate using a slope gauge.
Air pressure differential should be between -.25" and -.75" w.c.
To attach the slope gauge, open the control compartment door panel. Just
below the junction box, locate the tubing connections. Remove the cap at
each connection and attach the slope gauge using two field-supplied 1/4" x
1/8" female NPT barbed tubing connections. For instructions on measuring air
pressure, see Service Section, Paragraph 9.
The circuit indicator board is located in the control compartment electrical
box (See FIGURE 7). Check operation of all indicator lights by switching
lights that are not lit with one that is currently lit. Replace any burned out
indicator bulbs (P/N 125189).