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WARNING !!!! Dealer & Service Center Use Only
B. Remove the unit front panel to gain access to the defrost sensor . The defrost sensor will
be found strapped to the suction line in combination with the TXV sensing bulb, or, in
some models, the defrost sensor will be connected to the suction line independent of the
TXV bulb;
C. Carefully remove the insulation from around the sensor area;
D. Using a highly-accurate, surface-mount thermometer, attach the thermometer probe to
the suction line immediately adjacent to the Defrost Sensor. After the thermometer probe
is securely attached to the suction line, reinstall the insulation foam around the sensor;
E. With foam insulation and unit front panel reinstalled, restart unit, allowing it to run for
10-minutes ... Suction line temperature should have stabilized at this point...Note
suction line temperature as measures by the thermometer probe;
F. Follow the steps "1A." through "1D." above, to enter the service menu. Once [dEL] is
displayed, press the Pool / Spa key four times to display [dSC] (Defrost Sensor
Calibration). With the service menu parameter [dSC] (Defrost Sensor Calibration)
displayed pressing the Up ⇑ or Down ⇓ arrow key once will display the current
temperature value of the Defrost Sensor.
G. Compare the control's displayed defrost sensor temperature with the reading on the
thermometer. If the readings are the same, or within 1° F, no calibration is necessary. If
the temperatures differ 2 to 3° F, calibration is necessary. Using the Up ⇑ or Down ⇓
Arrow keys, adjust the display temperature to read the same as the reference
thermometer. The control can be adjusted to + 10° or - 10° from the displayed
temperature. However, offset calibrations greater than 3° should be avoided...Such
large offsets generally indicate problems with the method of suction line temperature
measurement, a defrost sensor not properly attached to the suction line, or other
equipment issues. Do NOT attempt to mask such issues through offset calibration.
H. Once the correct temperature value has been selected pressing the Pool / Spa key will
save the selected temperature and step to the next menu parameter [dB1] (Dead Band
Differential).
6. Dead Band Differential [dB1] ...
The dead band differential determines the number of degrees that water temperature must fall
before the thermostat closes again. The dead band is factory set @ .8°. It is highly
recommended the factory default of .8 remain, however, if for some reason the dead band
requires adjustment, follow the steps outlined below:
A. Follow the steps "1A." through "1D." above to enter the service menu. Once [dEL] is
displayed, press the Pool / Spa key five times to display [dB1] (Dead Band Differential).
B. With the service menu parameter [dB1] (Dead Band Differential) displayed, pressing the
Up ⇑ or Down ⇓ arrow key will change the dead band differential from 0.2° to 2.0°, in
.2° increments.
C. Once the desired dead band difference is displayed, pressing the Pool / Spa key will save
the currently displayed value and step to the top of the service menu [dEL] (4 Minute
Time Delay).
NOTE: To exit the service menu, not depressing any keys for 15 seconds will
automatically exit the service menu and resume normal operation.
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