Pereko KSP Duo, Operation And Maintenance Manual

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SUMMER function or HUW priority),
NO (boiler pump in operation as usual).
14 SERVICE SETTINGS OF MIXER
Mixer support
Off
Mixer servo and mixer pump are OFF
CH ON
It is used when the mixer circuit supplies CH radiator system. Max.
temperature of mixer circuit is not limited, mixer is fully opened
during alarms e.g. boiler overheating. Note: do not activate this
option if the pipes used are not high-temperature resistant. In such
conditions it is recommended to set "MIXER SUPPORT " at "FLOOR”.
Floor On
It is used when the mixer circuit supplies underfloor heating
system. Max. temperature of mixer circuit is limited to the value of
the parameter of " Max. preset mixer temp.” Note: upon selection
of the option of " FLOOR ON" set the max. preset mixer
temperature at such value, which prevents the floor destruction
and occurrence of burn risk.
Pump only
Once the mixer temperature has exceeded a "mixer preset value" ,
power supply to mixer pump stops. Once the mixer temperature
has dropped by 2 ºC, the pump switches on again. This option is
mainly used to control the underfloor heating pump in case it works
with thermostatic valve without servo.
Min. mixer temperature
This parameter is used to prevent the user to set too low preset
value of mixer circuit temperature.
Max. mixer temperature
This parameter has two functions:
- it enables preventing the user to set too high value of preset
mixer temperature,
- when the parameter "Mixer support" is set at " FLOOR ON ” , it
determines the limit value of mixer temperature at which the mixer
pump will stop. For underfloor heating set this parameter at the
value not exceeding 45°C - 50°C unless the manufacturer of
materials used to complete the floor or CH system designer has
recommended other values.
Valve opening time
Enter the time of full valve opening taken from the rating plate of
valve servo (e.g. 140s)
Pump OFF by thermostat
Once this parameter has been set at "YES", mixer servo closes and
mixer pump stops upon opening thermostat contacts (the room has
been heated). Performance of this operation is not recommended
because the heated room may be cooled down too much.
Operat. in SUMMER
Upon setting of Operat. in SUMMER = ON , mixer is not closed in
SUMMER mode.
Mixer input dead zone
Parameter setting, which determines the value of temperature
dead zone of mixer control system. The regulator controls the
mixer in the manner assuring that actual temperature value
measured by the mixer sensor is equal to the preset value.
Nevertheless, in order to avoid too frequent servo motions, which
may unnecessarily reduce its lifetime, regulation starts once the
measured temperature of the mixer circuit has been higher or
lower than the preset value by the value set in
Mixer input dead
zone.
Emergency valve opening
It is a % valve opening during active boiler overheating alarm. This
parameter is used for cast-iron boilers, and is available in some
regulators only.
Proportional range
This parameter influences the range of mixer servo motion.
Increase of its value causes actual mixer temperature reaches
faster the preset value, but too high value set causes temperature
overshoot and unnecessary servo motions. Correct value should be
determined experimentally. Recommended settings of this
parameter should be within the range of 2 – 6 [3].
Integr. time const.
The higher the value of this parameter is the slower the response
of servo on temperature off-set is. Setting too low value may cause
unnecessarily servo motions, while too high setting will increase
time of finding preset temperature value. Correct value should be
determined experimentally. Recommended settings of this
parameter should be within the range of 100 – 180 [160].