Metal-Fach ecoMAX860P TOUCH, Operating Manual, Page: 36 / 44

36
Return protection

Return protection 4D
This parameter turns on/off the boiler return protection function, which is
being done by mixing valve together with electric actuator. Attention: do
not activate this function when there is no actuator installed on the valve!

Return histeresis
The electric actuator will return to its normal operation with return
temperature ≥ min. return tempe return hysteresis.

Min. set return temperature
The boiler return temperature below which the electric actuator will close
the mixing valve.

Valve closing percentage
It is a value for opening the mixing valve during active return protection
function. This value is given in percentage. This value should be set in
such way, that the return temperature can raise. Attention: the return
protection function will work only in case when the set boiler temperature
will be set on sufficiently high value, otherwise there will be too many
lock ups of the actuator. Attention: The valve is locking up with the +-1%
of precision.

Temperature shunt pump
activation
The temperature at which the shut pump is activated.
Thermostat select
The following options are available:
Off
(deactivates the effect of the room thermostat on the boiler’s
operation)
Universal (enables a NO-NC room thermostat on terminals 42-43,
recommended for thermostats with hysteresis below 1K)
ecoSTER (this option is available when the ecoSTER TOUCH room
panel is connected, the signals on the status of the thermostat are sent
from the room panel)
Min. boiler temp.
Minimal set temperature for the boiler, that can be edited by the user in
user menu and also a minimal temperature, that can be automatically set
by a controller e.g. from night decrease, weather control etc.
Max. boiler temp.
Maximal set temperature for the boiler, that can be edited by the user in
user menu and also a maximal temperature, that can be automatically
set by a controller e.g. from night decrease, weather control etc.
Reserve boiler
Determines pellet boiler temperature below which reserve boiler is
activated (i.e. gas boiler). Setting "0” value causes deactivation of
reserve boiler control and switching joint number 43-44 on alarms
service.
Alarms
Allows for definition of alarm number or group of alarms after which exit
number 46-47 is connected. In order for alarms to connect exit,
parameter RESERVE BOILER must be set for value "0”.
Boiler cooling temp.
Preventive boiler cooling temperature. When this temperature is
exceeded, the regulator switches on the hot usable water pump and
opens the mixer circuits in order to cool the boiler down. The regulator
will turn the hot usable water pump when the temperature of this water
exceeds the maximum value. The regulator will not open the mixer circuit
when
mixer support = floor On .
Parameter A,B,C FL
Parameter is related with automatic power modulation of boiler by
stabilizing the preset boiler temperature. The bigger the value the bigger
increase in power of the boiler. Too big value can cause instability of
sustaining the preset boiler temperature.
14.3 CH and HUW
CH pump activation temperature
This parameter decides on the temperature of boiler pump activation. It
secures the boiler against retting, that can occur when the boiler is being
cooled down with cold water from the installation. Attention: deactivation
of boiler pump doesn’t guaranteed, that the boiler is secure against
retting and therefore corrosion. It is recommended to apply additional
automatics e.g. 4-way valve or 3-way thermostatic valve.
CH pump standstill when loading
HUW
It requires a HUW sensor to be plugged in. A prolonged HUW tank
loading can, with HUW priority activated, lead to excessive cooling down
of CH installation, because with these kind of settings the CH pump is
switched off. The parameter of pause time of CH pump preventing this
by periodic operation of CH pump while HUW tank loading. The CH
pump will after this time activate for fixed set time of 30s.
Min. HUW temperature
It requires a HUW sensor to be plugged in. This parameter can be used
for limitation of possibility to choose too low value of HUW set
temperature.