Blodgett KLS-60G - Manual (Page 25)

25
6.0 SERVICE (Continued)
PRESSURE SWITCH (Continued)
1. Pressure relief valve opening, especially on preheat from a cold start to 275
°F (135°C)
(pressure switch set too high).
2. Burners are being shut down by pressure switch, not the thermostat. (Pressure switch
set too low.)
The pressure switch is preset for proper operation from the factory. It is adjusted to the
maximum pressure, however not high enough to cause the pressure relief valve to open. This
setting will be slightly different on different kettles due to variations in the pressure relief valves.
During preheat to the maximum thermostat setting (275
°F (135°C), from either a cold condition
or a lower temperature setting, the temperature may overshoot the thermostat setting and shut
down the burners by the pressure switch. This is normal, however, after the kettle cycles
several times (empty) the thermostat will begin cycling the unit.
TO ADJUST PRESSURE SWITCH:
1. To obtain access to the pressure switch, the front panel must be removed. Remove the
screws on either side of the panel. Be sure to support the panel to avoid excessive
strain on the wiring.
2. To increase the pressure setting turn the white ribbed knob clockwise; to decrease the
pressure, turn it counter clockwise. Use the center of the black ring as an indicator.
3. With the kettle empty and completely cold, bypass the thermostat by moving the single
terminal side wire to the double terminal side connector on the thermostat. Turn kettle
on.
4. Pressure in kettle (read pressure gauge on front panel) should reach a maximum of 35
psi and pressure relief valve should not open. Kettle pressure may rise 3 or 4 psi even
after burners shut down.
5. Relief valve should not open when kettle pressure is 40 psi; pressure switch setting is
satisfactory.
6. If relief valve opens, reduce setting on pressure switch, cool kettle completely by running
cold water through it and repeat steps 3 - 6.
7. If pressure in kettle is below 30 psi when burners shut off, increase setting of pressure
switch, cool kettle completely by running cold water through it and repeat steps 3 - 7.
8. When adjustment is complete, move wire from shorted terminal on the thermostat back
to the appropriate terminal and replace the front panel.