Viconics HP727S - Manual (Page 6)

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6. INSTRUMENT IDENTIFICATION
DESCRIPTION OF FRONT PANEL:
POOL LED: Indicates that the Pool setpoint is selected.
SPA LED: Indicates that the Spa setpoint is selected.
HEAT ON LED: Indicates that the pool heater ( heatpump compressor ) is on, heating the water.
DIGITAL DISPLAY: Normally displays the actual water temperature. In set mode displays other parameters.
SERVICE / SELECT KEY: Used to enter the service mode or select between Pool and Spa temperature setpoint.
INCREASE KEY ↑ : Increases the selected parameter value.
DECREASE KEY ↓ : Decreases the selected parameter value.
NOTE: The display may be changed in steps by pushing the ↑ or ↓ keys repetitively, or automatically by holding down the same key
longer.
Pool LED
Spa LED
Heat on LED
Service / Select key
Decrease key
Increase key