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Inst.296 Viron eVo Series Pool & Spa Heater V07_16
5
DIGITAL THERMOSTAT OPERATION
DESCRIPTION
The sophisticated digital thermostat provides temperature read out, set point temperature, operating status of the
heater and any fault conditions.
TEMPERATURE DISPLAY
The temperature display indicates water temperature in the inlet of the heater. Therefore the pump must be
operating for an accurate pool or spa water temperature to be displayed.
Comfortable pool temperature is between 26˚C and 3C. Normal spa temperature is between 36˚C and 38˚C. To
select your desired temperature press the up or down button repeatedly until the desired temperature is reached.
To prevent rapid cycling of the heater, the thermostat has an inbuilt time delay which prevents the heater from
turning on for two minutes after the set point has been reached. If the time delay is activated, the symbol “L” will
be displayed on the LCD screen on the front of the heater. This is part of normal operation.
Should a fault condition occur, the heater will lock out and prevent further heating. A lock out condition is indicated
by the symbols F0 to F9. To reset a lock out condition, turn the power off for five seconds.
When the water temperature is heated to within 1 degree of the thermostat set point, the Viron burner will
modulate or turn down so that the set point is accurate maintained and not exceeded. This prevents waste of
energy typically associated with on/off burners. In addition, the set point is maintained very accurately, so the
when using your spa pool, you will notice very little variation in water temperature.
DISPLAY SYMBOL INDICATION
Under fault conditions the thermostat will display a set of alpha numeric symbols to indicate the status of the
heater. The meaning of each symbol and action to be taken are listed as follows:
SYMBOL MEANING ACTION
Temp Display Unit has power. No action.
F0 Heater locked off, thermistor If water temperature reads
wire disconnected or water greater than 0
C, phone for
at 0
C (freeze conditions). service.
F1 Thermostat reads greater Allow water to cool below 40
C ,
than 45
C. turn heater off then on again.
F2 Mechanical Hi Limit greater Allow water to cool below 30
C,
than 45
C. or 55
C turn heater off then on again.
F3 Thermistor fault Phone for Service
F4 N/A
F5 N/A
F6 Flue temperature safety device Phone for Service
locked out due to over temperature
F7 Condensate drain blocked Phone for Service
F8 Heat exchanger sensor fault Phone for Service
F9 Heat exchanger sensor too hot Phone for Service
Greater than 240degC
L Heater locked out on time No action. Heater will
delay for 2 minutes. Automatically reset after
time delay.
time delay.
Pump operating & sufficient No action.
water pressure to operate heater
Thermostat calling for heat. No action.
Electronic Flame Supervision
operating.
Burner Operating No Action
5


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