Vulcan-Hart ML-126610, Service Manual

Page: 30 / 75

4. Install hose barb adapter and attach manometer
tube.
5. Turn gas supply to the oven back on.
6. Plug the unit in and turn the power switch ON.
7. Set the temperature control to its highest setting
and allow burner to ignite.
NOTE: The burner must be lit during test.
NOTE: Accurate gas pressure readings can only be
made with the gas on and the burner lit.
GAS
TYPE
PRESSURE READING (IN W.C.)
MANIFOLD
LINE
RECOMMEND MIN MAX
Natural 5.0 8.0 6 14
Propane 10 11.0 11 14
NOTE: If the incoming line pressure to the valve is
less than the minimum stated, then the manifold
pressure will not be maintained.
NOTE: If gas valve cap is removed, or reversed for
gas type, ensure sealing washer is installed between
the gas valve and cap.
NATURAL GAS
• If the incoming pressure to the valve is between
6” WC and 14” for Natural gas and the manifold
pressure is not maintaining 5” WC, and the cap
(1, Fig. 60) is correctly positioned, replace the
valve.
PROPANE
• If the incoming pressure to the valve is between
11” WC and 14” for Propane gas and the manifold
pressure is not maintaining 10” WC, and the cap
(1, Fig. 61) is correctly positioned, replace the
valve.
Fig. 60
Fig. 61
ITEM DESCRIPTION
1, Fig. 60
Cap position for natural gas
(stamped NAT).
1, Fig. 61
Cap position for propane gas
(stamped LP).
VERIFICATION OF SPARK AT
IGNITOR
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
1. Remove the Bottom Front Cover.
2. Disconnect the high voltage "ignition cable" from
the spark ignitor.
Fig. 62
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F24682 Rev. D (1016) Page 30 of 75