Tech Controllers EU-402N PWM User Manual page 17

SCHEME 14/17 – HEATING CH RETURN
Installation 14/17 supports:
➔
collector pump,
➔
valve switching between direct boiler circulation and through-
tank circulation
➔
solar accumulation tank – with lower and upper circuit
➔
tank 2 ( heated by additional heat source e.g. CH boiler),
➔
one direction of collector positioning,
➔
tank 2 pump – mixing pump
Installation sensors:
➔
collector sensor,
➔
two sensors of accumulation tank.
➔
tank 2 sensor
This system automatically chooses the tank which will provide hot water (the regulator selects the tank with
higher temperature). During high insolation periods, water in the solar tank may reach very high temperature, which in
turn may be transferred to tank 2 in order to heat more water than the solar tank capacity allows.
No possibility of connecting and selecting an additional device - Peripherals submenu is not available in the service menu.
Switching valve controlling the additional receiver is connected in the place of peripheral device
Additional parameters to be configured:
•
valve hysteresis
•
Operation algorithm
•
Pump deactivation delta 2
•
Pump activation delta 2
SCHEME 15/17
Installation 15/17 supports:
➔
collector pump
➔
switching valve
➔
solar accumulation tank
➔
tank 2 (heated by additional heat source e.g. CH boiler)
➔
one direction of collector positioning,
➔
additional peripherals.
Installation sensors:
➔
collector sensor,
➔
two sensors of accumulation tank
➔
tank 2 sensor
In this system the user may choose the tank which will provide hot water (the controller chooses the tank with higher
temperature). During low insolation periods (winter), the water is taken from the tank 2 (heated by the additional heat
source e.g. CH boiler) whereas solar collector water, heated by the solar heating system, is transported to tank 2 input as
cold water
.
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