Specifications

DV - 520
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SERVICING Cont...
• Open the lower grills.
• The pressure test taps are located on the valve.
Automatic valve: The taps are located in the front. The supply pressure is marked ‘IN’ and
the manifold pressure is marked ‘OUT’. There is also an arrow marking the
direction of gas flow.
• Loosen the set screw inside the tap with a 1/8” wide flat screw driver.
• Connect a 1/4” rubber tube to the tap and to the manometer.
• Be sure to tighten the set screw inside the tap after you are finish taking pressure readings.
• Check for leaks.
CHECKING SUPPLY AND MANIFOLD GAS PRESSURE
CHECKING AND ADJUSTING PILOT
The pilot flame should have the characteristic as shown in the illustration below. The flame
should not have yellow tips but should engulf the thermocouple and thermopile. It can be ad-
justed by turning the screw marked “pilot” on the control valve.
• Remove the glass door, log branches and the front log.
• Unscrew the 2 screws holding the burner to the floor.
• Lift the burner up and away from the orifice cap.
• Use a 1/2” wrench to remove the orifice cap together with a 9/16” wrench on the fitting
(under the firebox).
• Change the orifice cap. Use a small quantity of gas thread seal compound. Do not over
tighten.
• Set the primary air shutter on the burner according to the specifications.
• Replace the burner, front log, branches and the glass door.
• Check for leaks.
CHANGING MAIN BURNER ORIFICE