Vulcan-Hart RGT-10 Installation, Service & Parts Manual page 11

PARTS REPLACEMENT (Cont.)
E. TRANSFORMER. The control transformer is used to
step down the available supply voltage from 480 volt to 240
volt on the electric models and from either 480 or 240 to
115 volt on the gas models for the use of the control and
oven light circuits. The jumper straps (or wires) are used to
change the input and output voltages to the required ratio.
Below is the schematic showing the 3 connections used in
different models. In replacing the old transformers with the
new ones care must be taken to follow the required
connection accurately.
SHUT-OFF VALVE SERVICE
The gas shut off valve is located at the rear of the unit and
should be used to shut the unit down when service is
required to gas components. This valve should also be
used to turn all gas off to the unit when the unit is being
shut down for an extended period of time.
If the shut off valve requires service this may be ac-
complished only by turning off the gas supply upstream of
the valve.
BURNER ORIFICE DATA
Maximum
Model
Input
Per Burner
RGT-10 32500
32500
9
Pressure Orifice
Reg. Setting Drill Size
3.7" W.C. 31
10" W.C. 51
PRESSURE REGULATOR SERVICE
The pressure regulator is located at the rear of the unit
downstream from the shut off valve. If the pressure
regulator requires service, this may be accomplished by
turning off the gas supply upstream from the shut off valve
and pressure regulator and then removing both of these
parts.
Blockage of the pressure regulator leak limiter will result in
erratic burner operation and pilot outage.
NOTE: Prior to replacing a pressure regulator, in an effort
to correct problems traced to this component, remove and
clean the leak limiter.
PILOT BURNER ADJUSTMENT
Remove lower panel assembly (spring clip mounted) and
light both pilot burners.
Adjust pilot flame heights to approximately 1/2". Flame
should impinge on flame switch sensing bulbs located
directly above the pilot burner flames. See Detail A for
location of pilot. Both pilot valves are located in the front
center of the burner compartment.
AIR ADJUSTMENT
Although main burner air is adjusted before shipment, it
should be checked at the time of installation. Excessive
air will cause flames to lift off a burner when cold or may
cause flash-back during normal cycling of unit, particularly
when propane gas is used.
Insufficient air will cause flames to burn with a yellow tip
and result in carbon accumulation in the flame chamber
and heat exchange tubes.
REPLACEMENT OF SOLENOID VALVE,
REGULATOR, OR SHUT OFF VALVE
MODELS RGT-10
=Turn off gas supply upstream of unit.
=Break gas connection at shut off valve.
=Break compression fittings at front manifold.
=Remove (4) bolts (inside center chamber) to rear
Gas
manifold support.
=Disconnect wires to solenoid at wire units.
NAT.
=Pull manifold out back of unit.
Propane
=Remount manifold by reversing procedure listed
above.