Hot Surface Ignitor (Gas Model); Temperature Controller And Potentiometer Test (Gas Model) - Vulcan-Hart VGCTS16 Service Manual

ROUND TILTING BRAISING PANS - SERVICE PROCEDURES AND ADJUSTMENTS
HOT SURFACE IGNITOR
(GAS MODEL)
1. Check to see if hot surface ignitor is operating
during ignition trial by:
A. Visual verification - HSI should be heating
up "glowing brightly" to ignite gas.
B. Voltage verification - check for 24VAC to
HSI termination on the edge connector to
ground.
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
2. Unplug the edge connector from the ignition
module and check resistance between HSI lead
wire and ground.
HSI
CONDITION
COLD
HOT
RESISTANCE
(approx. Ohms)
1 - 4
8 - 10
Page 14 of 24
TEMPERATURE CONTROLLER
AND POTENTIOMETER TEST
(GAS MODEL)
WARNING: THE FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
Temperature Controller
1. Assure a proper ground, correct polarity and
that the value of incoming voltage is correct.
2. Turn the gas supply on, power switch ON and
set the thermostat to call for heat. The braising
pan must also be down to close limit switch.
3. Verify the temperature controller is receiving
power (120VAC) across L1 & L2. Once the
relay contacts close, the temperature light on
the front control panel will illuminate and the
step down transformer receives power.
A. If controller output remains for
approximately 20 seconds then drops off,
an open thermocouple condition may
exist. Replace the thermocouple and
check for proper operation.
B. If the controller remains energized but
burner does not come on, verify the relay
contacts (N.O.) are opening and closing
when power to the controller is removed
and applied. Check voltage out between
N.O. and L2.
1) If relay is functioning properly then
the problem is not with the controller.
See Troubleshooting section.
2) If relay is not functioning properly
then replace controller and check
proper operation.