Jackson 100 B/PRB, Service Manual, Page: 15 / 55

THERMOSTAT ADJUSTMENT
The thermostat can be adjusted by turning screw # 1 (see picture) on the thermostat control box cover.
(Remember the present setting, in case the problems are elsewhere in the control circuit.) A CW rotation is
used to obtain a lower temperature setting and a CCW rotation is used to obtain a higher temperature
setting. A 1/8 turn of screw # 1 changes the temperature approximately 15° F. If screw # 1 is turned all the
way to its stop in either direction; adjust screw #2 as follows. DO NOT TOUCH THE SCREW SEALED WITH
RED PAINT. When adjusting screw #2 power should be disconnected during adjustment.
Set screw # 1 so that it can be turned equal distances in either direction, then:
- - -if screw # 1 stopped while turning in CW direction, turn screw #2 in CW direction
slowly and only 1/8 of a turn or less per complete cycle of the unit.
- - -if screw # 1 stopped while turning in CCW direction, turn screw #2 in CCW direction
slowly and only 1/8 of a turn or less per complete cycle of the unit.
Three-fourth's of a turn will bring the thermostat to approximately the same setting obtained where
screw # 1 stopped. Check the present temperature setting before attempting any further adjustments. Use
screw
# 1 for any further adjustments.
Making large moves in adjusting may cause misalignment
thus increasing the chances that further adjustment cannot be
made and the thermostat will have to be replaced.
NOTE: Some machines were equipped with factory preset
thermostats (wash: P/N 1700-W & rinse: P/N 1700-R) which do not
have adjustment screw #1.
NOTE: