Repair manual

CALIBRATION AND ADJUSTMENT
4-6
LOW LIMIT ADJUSTMENT
1. Bring the oven to 200F (93C).
2. Turn both the blower and the heat switches to
OFF. The blower should continue to run.
3. Monitor the digital temperature control display.
The blower motors should shut off within the
range of 170Ć135Fāāā(77Ć57C).
4. To adjust the temperature, turn the lowĆlimit
potentiometer. A clockwise rotation increases
the setting, counterĆclockwise decreases it.
See FIGURE 7.
HIGH LIMIT ADJUSTMENT
NOTE: Refer to the wiring diagram located on the
oven or on page 3-25 of the Operation
section. For additional assistance call the
Blodgett Service department.
1. Remove the wires from the common and N.O.
terminals. Touch the wires together to energize
the heat circuit. This enables the oven to heat
above the highest temperature allowed by the
controller.
2. When the display reads 600F (316C), the
burner blower motor should shut off. If the temĆ
perature rises above 600F (316C), adjust
the hiĆlimit pot (FIGURE 7) so the burner shuts
off at 600F (316C). A clockwise rotation of
the highĆlimit pot increases the temperature,
counterĆclockwise decreases it.
INCREASEDECREASE
INCREASE
1 2 3 4 5 6 7 8
230 115 NC C NO NO C
DECREASE
LOW LIMIT
HI LIMIT
United Electric Board
Athena Temperature Controller
ZYTRON
SERIES 300
13 26 5
478
115
230
NO C NC
OUTPUT 1
NO C
OUTPUT 2
T1
P1
LOW LIMIT
P2
HI LIMIT
P3
910
+
T/C
RED
INCREASE
DECREASE
DECREASE
INCREASE
Zytron Board
ACTUAL SETPOINT HEAT
FIGURE 7