Viconics HP727S User Manual

Page 10

8. SERVICE AND CALIBRATION:

CALIBRATION AND RECONFIGURATION SHOULD BE DONE WITH CAUTION BY QUALIFIED PERSONNEL ONLY.

To enter the service mode, press down the Service key, for 8 seconds, until the display show the message Loc. You have 12
seconds from the time the last key was touched to make an adjustment. 12 seconds after the last key was depressed, any modified
value will be stored into EEPROM memory. After that, the unit will return to normal operation mode.

Adjustable parameters:

Loc

Lock code

Adjustable from 00 to 99 ( 00 is no lock mode at all )
Factory default value is 50

dEL

Compressor anti-cycle delay by-pass

Parameter value is at 0. Adjust value to 1 and wait
until control goes back in normal operation mode. 3
minutes anti-cycling delay is by-passed for 1 cycle
only.

tSC

Water temperature calibration ( Shows the actual water
temperature )

Adjustment is

± 5°F ( ± 3°C )

dSC

Evaporator defrost temperature calibration. ( Shows the actual
evaporator temperature ) ( Viewable in calibration mode only )

Adjustment is

± 5°F ( ± 3°C )

db1

Pool / Spa setpoint hysterisys

0.2°F to 2.0°F ( 0.1°C to 1.1°C )
Factory adjustment is 0.8°F

Pressing the Service / Select key repetitively will scroll down all parameters.
Go to the desired parameter. The display will show the parameter name.
Use the

↑ or ↓ arrow once to display the actual value of the selected parameter.

Use the

↑ or ↓ arrow to adjust the parameter to the selected value

The display may be changed in steps by pushing the arrows briefly, or faster by holding down the desired arrow key.

NOTE: Any modified parameter value will be stored 12 seconds after the last arrow key was touched
The new value will be stored into EEPROM memory and the unit will return to normal operation mode.

Important notes:
Any time a new parameter value is stored, the display will blank out momentarily

Any modified parameter should be stored in writing on the instrument label inside the heatpump unit.

LOCK CODE ( Loc ):

The lock code provides security against unauthorized tampering of parameter values.

If the lock feature is enabled
Pressing the [Service / Select ] key for 8 seconds, will make the "Loc" message appear on the display.
Enter the Loc code value using the arrows.

If an incorrect code is entered, the unit will exit the service mode, and the entire process will have to be repeated.

Once the proper lock code is entered, the lock value can be modified the second time the Loc parameter appears while scrolling
down the parameters.

If the Loc code is forgotten, proceed with the following procedures:

Remove the power from the instrument.

Press and hold the [Service / Select ] key while powering-up the instrument.

The message dEL will appear.

The lock function is temporarily disabled.

Step to Loc parameter, as re-enter a new value as described in the above procedure.