Pitco SGH50 Handbuch Seite 5

Allow the oil to cool and check the probe resistance at a
lower temperature. As can be seen from the chart a
greater variation can be tolerated at a lower tempera-
ture.
Gas Valve:
The gas valve has a dual 24 VAC operator and will
open when the correct voltage is supplied to the
operator. With 24 VAC applied to the PV (24 VAC)
connection, the pilot valve operator will open, allowing
gas to flow to the pilot.
With 24 VAC applied to the MV (24 VAC)
connection, the main valve operator will open,
allowing gas to flow to the main burners.
Hi Limit:
The hi - limit switch is a normally closed switch until
the temperature at the hi-limit bulb reaches 450°F ±
15°F.
WARNING!
This test should be performed by a qualified
technician only! Monitor the fryer closely. This
test will cause the oil to heat past the normal
operating temperature and can cause damage
to the machine and its operator if care is not
taken.
WARNING!
This test will cause the burners to run continuously.
Remove test resistor when test is complete.
Leaving the test resistor in the fryer could cause
damage to equipment and/or personal injury.
To test the hi-limit, use a 2kΩ - 5kΩ resistor to simulate
a 230°F - 275°F temperature. This will cause the
burners to run continuously until the hi-limit trips or the
fryer is turned off.
•If the fryer is equipped with a computer or digital
controller, plug the resistor in at connector J41 behind
the front panel.
•If the fryer is equipped with a solid state controller
behind the door, plug the resistor in at connector J43
behind the front panel.
If the switch does not trip between the prescribed limits
it is defective and should be replaced. Once tripped, the
switch cannot be reset until the oil has cooled to
approximately 400°F + 20°F. If the switch does not
reset after oil has cooled it is defective.
Drain Valve & Return Valve Switches:
These switches are a magnetically operated proximity
switches. When the Drain Valve handle is moved to the
open position, the Actuator will move away from the
switch causing the switch to open. When the Drain Valve
is closed the switch will close.
Opening the RED return valve handle will close the
proximity switch causing the "pump on" relay to be
energized. The pump will begin to pump. Closing
the return valve handle will open the proximity switch
causing the relay to de-energize and the pump will stop
pumping. These switches can also be checked with an
Ohm meter. When the switch is closed, you should have
continuity. The normal gap between the Actuator and the
Sensor switch on the valve handle is
6mm).
Transformer:
The transformer is a multiple AC input voltage 24 VAC
output voltage and can be checked by reading the input
and output voltages. A quick check for 24 VAC can be
done at the relay board behind the front panel. The AC
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L22-235 Rev 0 (04/03)