Control Valve; Rack Spring Tension Adjustment - Vulcan-Hart VBB1F Service Manual

V-SERIES HEAVY DUTY BROILERS, DOUBLE DECK AND RANGE MATCH MODELS - SERVICE PROCEDURES
burner Fig. 30 or Infrared burner Fig. 31. Inspect the
following:
• Gas orifice alignment - orifice should be centered
in the venturi opening and perpendicular to the
burner.
• Check gas orifice for blockage or damage. If dirty,
clean with air or water only.
• Verify gas orifice is correct for the altitude.
Ceramic-Radiant Burner Orifice
Fig. 30
Infrared Burner Orifice
Fig. 31

CONTROL VALVE

Shut off the gas before servicing the
unit.
Inspect the control valve for smooth rotation,
noticeable wear and any possible damage. The
burner flame should increase smoothly as the valve is
opened (highest setting) and decrease smoothly as
F45548 (0715)
AND ADJUSTMENTS
the valve is being closed. When inspecting valve,
always apply a light amount of valve grease at the
base of the valve stem. See LUBRICATION. If valve
grease does not improve rotation of the valve, or
damage is found, replace the CONTROL VALVE as
outlined under REMOVAL AND REPLACEMENT OF
PARTS.
RACK SPRING TENSION
1. Raise the rack lift assembly to its highest position
on stop bracket to relieve spring tension.
2. Access spring tension adjusting nuts from the
front of broiler.
3. Tighten nut [1] to adjust rack spring tension.
Adjust both springs equally so there is
approximately 5/8" of thread above the nut.
Spring tension is properly adjusted when the rack
assembly can be comfortably raised and lowered
by the operator using one hand.
4. If additional rack spring tension is required,
tighten each nut an additional 2-3 turns and re-
check.
5. Check for proper operation.
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ADJUSTMENT
Fig. 32
Fig. 33