CSZ MICRO-TEMP LT 749 - Tubing and Sensor Replacement; Replacement of Water Temperature Sensor

FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 50 of 75
5-6. REPLACEMENT OF THE TWIN BLACK TUBING
A. Contact CSZ Technical Service.
5-7. REPLACEMENT OF THE WATER TEMPERATURE SENSOR (THERMISTOR)
A. Obtain replacement water temperature sensor.
B. Drain the reservoir as described in Section (4-2.1).
C. Separate the front and rear enclosure as described in Section (5-2.1).
D. Loosen hose clamp on connecting hose to output hole of heater plate on reservoir.
E. Disconnect cables from the control board as described in Section (5-2.3).
F. Remove reservoir from unit.
G. Twist off heater cap on reservoir and remove heater mounting plate.
H. Locate the water temperature sensor inserted at the right of the heater on the heater
mounting plate.
I. Remove water temperature sensor using 7/16” open-end wrench by turning in
counterclockwise direction. Set water temperature sensor aside.
J. Wrap 4” of Teflon tape around the threading of the new water temperature sensor,
then insert and tighten the sensor into the brass fitting using a 5/8” open end wrench.
K. Insert the brass fitting into the heater mounting plate.
L. Place rubber gasket onto the brass fitting, and then the stainless steel washer.
M. Secure the brass fitting to the heater plate with the brass jam nut.
N. Tighten brass fitting until snug using an 11/16” open-end wrench (a 7/16” open-end
wrench can be used if necessary to hold the sensor in place).
WARNING
 Always unplug the unit before accessing internal components during service. Failure to
unplug the unit could result in electric shock.
CAUTION
 Always drain the MICRO-TEMP
®
LT unit to a sanitary drain because bio-contaminants may
be present in the unit’s water supply.