Priority; Iii.h.3) Parallel Pumps; Iii.h.4) Summer Mode - Tech Controllers EU-81zPID User Manual

User's manual
III.h.2)
Activating the hot consumption water priority will cause the regulator to switch into the water heater
priority mode. In this mode, the (hot consumption water) heater pump is activated until the set H.C.W.
temperature is reached. Then, the H.C.W. pump is shut off and the C.H. pump is activated. The central
heating pump will run until the water heater temperature drops below the setpoint value (and the H.C.W.
hysteresis); then, the C.H. pump is shut off and the H.C.W. pump is activated.
In this mode, the fan is operated as long as the temperature is below 62°C to prevent the boiler from
overheating.
The hot consumption water priority function consists in that the consumption water is heated up before
heating up water in radiators.
While in the H.C.W. Priority mode, the icon
ATTENTION: The boiler should have non-return valves mounted on the central heating pump circuit and
the hot consumption water pump circuit. A valve mounted on the hot consumption water pump will
prevent hot consumption water from being drawn from the water heater.
III.h.3)
In this mode, the pumps start to run in parallel above the pump activation temperature (set by default
to 35 O C). These temperatures may, however, vary depending on user settings. This will cause irregular
activation of the pumps. However, when both thresholds are exceeded, the pumps will operate
simultaneously. The central heating pump runs continuously, while the hot consumption water pump
stops after the setpoint temperature is reached in the water heater.
While in the Parallel Pumps mode, the icon
ATTENTION: In this mode, a non-return valve should be fitted to maintain different temperatures in the
water heater and in the house. After activation of the parallel pumps function, three items appear on the
display. Starting from the left, these are: Boiler Temperature (C.H.); Water Heater Temperature (H.C.W.)
and Setpoint Temperature (C.H.).
III.h.4)
When the function is enabled, only the hot consumption water pump is running in order to heat water in
the water heater. The pump is switched on above a predefined activation threshold (see the pump
activation temperature function) and will run until the setpoint temperature has been reached. The pump
will start again when the temperature drops below the set hysteresis. In the Summer Mode, only the
setpoint temperature is set on the boiler that heats up water for the water heater (the temperature set
for the boiler is also the temperature set for the water heater).
While in the Summer Mode, the icon
H.C.W. Priority
Parallel Pumps
Summer Mode
is displayed in the up right corner of the main screen.
is displayed in the up right corner of the main screen.
is displayed in the up right corner of the main screen.
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