Rev 8/2014
PrecisionTemp, Inc • 11 Sunnybrook Drive • Cincinnati, Ohio, 45237 • 1-800-934-9690 •
fax 513-641-0733 57
SB-17 Thermistor Reading Procedure
Model: PT-200FT, PT200RC & PT-56
Software version: All
Tools required: DC Multi meter
The precise temperature of the water in the heater can be determined by reading
thermistor DC voltages at the colored test points on the green control board (See
Electronic Control Board—Illustration #200-14) with a multi-meter and referring to
the "Thermistor Calibration" table.
The black multi-meter probe should go into the black test point and the red
probe should go into the following test points:
Orange/Red Test Point = Outlet temperature (T-Out)
Yellow Test Point = Mid temperature (T-Mid)
Inlet temperature (T-In) is read from inboard blue wire on connector #1329
(thermistor harness plug) of the green control board.
Power must be on for the booster to take the readings. Refer to the DC voltage
reading in the "volts" column on the "Thermistor Calibration" chart. The
corresponding temperature is the column to the left of the volt reading.
Kit Parts List:
None
Reference Illustrations:
200-14 Electronic Control Board
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