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4.4
Power
On
To start the appliance:
B press the ON/OFF
LED (fig. 34) goes orange.
When the burner is working, the LCD display shows
the symbol
.
Fig. 35
Off
To shut down the appliance:
B press the ON/OFF
4.5
Recirculating water temperature
Water temperature can be regulated in a range of
113°F to 194°F. The heater modulates the burner flame
according to current demand selected on left knob.
To select water temperature:
B Rotate recirculating water temperature selector
in order to change heating recirculating temperature
(ranging from 113°F to 194°F).
The display will show this symbol
selected temperature.
If the burner is on, symbol
Fig. 36 Recirculating water temperature adjustment
6 720 607 909
button.
switch to OFF position.
and blink the
goes ON.
4.6
Temperature and hot water flow
Choose one the following:
• If using a tank mounted Aquastat, set temperature on
Aquastat control (left knob should be in maximum
position).
• To activate and use the appliance domestic
temperature dial, a 12 kOhm thermistor is required
(part number 8 714 500 034) (See 2.6, Page 8 for
wiring diagram).
B Connect the 12kOhm thermistor blue wire to the
DHW NTC terminal block.
Install the sensor in the tank well.
Hot water temperature can be set from 50°F to 158°F
using hot water temperature selector
Fig. 37 Hot water temperature adjustment
Thermostat
knob position
Min.
approx. 50°F (10°C)
Max.
approx. 158°F (70°C)
Table 15 Domestic hot water temperature
adjustment
4.7
Freeze protection
B Do not disconnect the electric supply from heater.
B Do not install in unheated areas which can
experience freezing temperatures.
B Do not use non-potable additives like glycol.
Freeze protection
Freeze protection is always assured by the operation of
the appliance.
If the primary NTC (temperature) sensor detects
temperatures below 41°F, the appliance starts on
minimum power until the sensor reads temperatures ≥
41°F.
Operating instructions
(Fig. 37).
DHW
temp.
29
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