Plum ecoMAX920P1-S TOUCH, Инструкция по установке и эксплуатации, Страница: 38 / 48

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the controller operates only with a standard room thermostat.
Return protection
A set of parameters available after connecting return sensor, responsible for return protection of the
boiler with hydraulic installation with four-way valve equipped with mixer servomotor. It is not
recommended to turn on return protection function as it may cause often supply pauses in mixer
circuit. Instead of that it is recommended to use higher preset boiler temperatures (70-
75°C) which
will cause, in installation with four-way valve (with servomotor) automatic return temperature
increase.
Minimum boiler
temperature Minimum preset boiler temperature that user can set in the user menu and minimum that the
controller can set automatically, e.g. from night decreases, floor control etc.
Maximum boiler
temperature Maximum preset boiler temperature that user can set in user menu and maximum that can be
automatically set by the controller, e.g. from night decreases, floor control etc.
Auxiliary boiler Description in section 12.14
A,B,C FL parameter
Applicable to FuzzyLogic mode. They affect speed at which boiler temperature reaches preset
value and stability of sustaining this temperature. It is not recommended to change these
parameters if the control speed and stability of sustaining value of preset temperature is at the
desired level.
Boiler cooling
temperature
Temperature of preventive boiler cooling. Above this temperature the controller switches on the
HUW pump and opens mixer circuits to cool down the boiler. The controller will switch off HUW
pump if the water temperature exceeds maximum value. The controller will not open the mixer
circuit when
Mixer support = Floor on.
Boiler thermostat
function
Available options:

Turn off boiler
– after activation of boiler thermostat the burner is off, only boiler pump
operates.

Turn off pump
– boiler pump will be off when boiler thermostat activates. Burner still operates.

Turn off burner and pump
– after boiler thermostat activates the burner and pump of the boiler
will be turned off.
14.3 CH and HUW
Parameter Description
CH pump activation
temperature
Parameter determines temperature at which the CH pump of the boiler will switch on. It prevents
retting of the boiler due to cooling it with cold water returning from the installation. Attention:
switching only pump off does not guarantee boiler protection against retting and, as a result,
corrosion. Additional automatics should be used, e.g. four-way valve or thermostatic three-way
valve.
CH pump standstill
during HUW loading
Available after connecting HUW sensor. Extended HUW container loading with HUW priority on may
result in excessive CH installation cooling, since with such settings CH pump is off. CH pump
standstill parameter during HUW loading prevents it by enabling periodical CH pump activation
during loading of HUW container. CH pump will activate after that time for constant programmed
time of 30 sec.
Minimum HUW
temperature Available after connecting HUW sensor. It is a parameter with which user can be limited to set too
low preset HUW temperature.
Maximum HUW
temperature
Available after connecting HUW sensor. The parameter determines till what maximum temperature
HUW container will be heated during discharging of excess heat from the boiler during alarms. It is a
very important parameter, since setting its value too high might result in risk of scalding users with
utility water. Too low value of this parameter might result in that during boiler overheat it will be
impossible to discharge excess of the heat to HUW container. When designing HUW installation a
risk of
damaging the controller must be considered. Due to controller’s malfunction water in HUW
container might be heated up to dangerous temperature, causing scalding of users. Additional
protection in a form of thermostatic valves should be used.
Increasing boiler
temp. from HUW and
mixer
The parameter determines by how many degrees the preset boiler temperature is increased to load
the HUW container, buffer and mixer circuit. Increasing the temperature is done only when
necessary. When preset boiler temperature is at sufficient level the controller will not change it due
to necessity of loading HUW container, buffer or mixer circuit.
Extending HUW
pump operation time
Available after connecting HUW sensor. After HUW container is loaded and HUW pump is off there
can be a danger of boiler overheat. It happens when the preset HUW temperature is set to higher
than preset boiler temperature. This problem especially concerns HUW pump operation in SUMMER
mode, where CH pump is off. To cool down the boiler, HUW pump operation can be extended by the
time of
Extending HUW pump operation time .
Circulation pump
standstill time
Parameters are available after connecting additional module C. Standstill time between the periods
of circulating pump operation is defined by the value of the
Circulating pump standstill time
parameter (recommended setting 15-40 min.). Circulating pump operates cyclically for Circulating
pump operation time (recommended setting 60-120 sec.)
Circulation pump
operation time
Heat exchanger
Parameter is available after setting Show advanced parameter to YES. Applies only to hydraulic
installations with heat exchanger between open and closed circuit.
Available options:

YES
– boiler pump operates continuously in short circuit boiler – exchanger, it is not turned off,
e.g. from SUMMER mode or HUW priority

NO
– boiler pump operates normally.