Aquacal Heat Pump - Manual (Page 48)

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4. Water Sensor Calibration... continued:
C. Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [tSC] (Water Temperature Calibration). Using
either the [UP] or [DOWN] arrow keys, calibrate the water temperature sensor by increasing
or decreasing the numeric value displayed to match the measured water temperature. The
controller can be adjusted to +10
o F to –10 o F from the nominal displayed temperature.
However, offset calibrations greater than 3 o F should be avoided… Such large offsets
generally indicate problems with the method of water temperature measurement, a water
sensor not properly inserted into the well, or other equipment issues. Do NOT attempt to
mask such issues through offset calibration.
D. Once the corrected temperature is displayed, Not pressing any buttons for 15 seconds will
allow the controller to save the selection and return to the normal operating mode. Pressing
the {POOL/SPA] key will also save the selection and step to the next menu parameter:
[dSC] (Defrost Sensor Calibration).
Controls Configuration & Adjustments...
Level-2 Microprocessor Programming... continued:
(Continued on Next Page)
5. Defrost Sensor Calibration [dSC] (Checking-Adjusting):
In the event it is suspected the defrost Sensor requires calibration, the following steps must be
followed closely to ensure correct defrost operation:
A. At the heater control panel “Mode” button, set the system to OFF.
B. Remove the heater front panel to gain access to the defrost sensor location. The defrost
sensor will be found strapped to the suction line in combination with the TXV bulb, or
strapped and separately insulated nearby the TXV bulb. Note: if unsure of sensor location,
follow–to termination–the pair of wires leading from the “FS” terminals on the controller PC
board.
C. Position a clamp-on, thermocouple-type temperature sensor onto the suction line; position
the clamp immediately adjacent to the defrost sensor. Connect the clamp-on thermocouple
to a multimeter designed to accept the input of the clamp-on device.
D. Once the heater has remained OFF for a minimum of 10-minutes, procede to step “E,”
below.
E. Follow steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [dSC] (Defrost Sensor Calibration). With [dSC]
displayed, pressing either the [UP] or [DOWN] arrow key, once, will display the current
temperature value of the defrost sensor.
F. Compare the controller’s displayed defrost sensor temperature against the reading obtained
by the clamp-on device. If the temperatures are the same, or within 1 o F, calibration is NOT
necessary. If the temperatures differ by 2 to 3 o F, calibration is necessary. The controller can
be adjusted to +10 o F to –10 o F from the nominal displayed temperature. However, offset
calibrations greater than 3 o F 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.