Pereko AGRO Multi 12, Operation And Maintenance Manual

Page: 70 / 116

34
values indicated in the table above for
individual alarms (i.e. 2 + 8 = 10) and set so
calculated sum. For signaling alarms: AL1,
AL2 and AL3 -
set ,”7” because the sum of 1
+ 2 + 4 = 7.
11.13 Connection of mixer servo
When connecting electric servo of
the mixer take care to prevent
boiler overheating, which may
occur when the flow of boiler
water is limited. You are advised
to get familiar with the position of
the valve corresponding to its
maximum
opening before
commencement of the work so
that you may ensure heat
collection from the boiler at any
time it is required.
The regulator works only with mixing valve
servos equipped with limit switches. Use of
other servos is not allowed. The servos of full
turn time from 80 to 255 s may be used.
Description of mixer servo connection:
- connect mixer temperature sensor,
- switch on the regulator and select proper
mixer support in service menu:
MENU Service Settings
PASSWORD Mixer Settings - e.g. "CH
ON ”.
- enter proper
Valve Opening Time (Valve
Opening Time ) in Service Settings (this time
should be indicated on servo rating plate e.g.
120s),
- disconnect power supply of the regulator,
- determine direction of servo closing/
opening. For this purpose, set the selector
located on the housing of electric servo at
manual control and find the positions of the
valve in which the temperature in mixer
circuit is maximum and minimum (it
corresponds to the setting of the regulator of
"100% ON" and "0% OFF”, respectively).
Write down these positions.
- connect mixer pump,
- wire mixer servo with the regulator,
- connect power supply to the regulator,
- check whether wires to mixer closing and
opening are not interchanged. To do this,
enter MENU
Manual Control and open the
mixer by selection of Mix1 open = ON . When
opening, temperature on mixer sensor
should increase. In other case, disconnect
power supply to the regulator and
interchange the wires (Note: other reason of
this fault may be incorrect mechanical
connection of the valve!
– refer to the
documentation of valve manufacturer and
check whether the valve is properly
connected),
- calibrate % factor of mixer valve opening.
To do this, disconnect power supply of the
regulator and set the selector on housing of
electric servo at manual control. Turn the
valve head to fully closed position, and set
the selector on the housing of electric servo
at AUTO again. Connect power supply to the
regulator. Now, % factor of mixer valve
opening
has been calibrated. Note:
Calibration in mixers no. 2,3,4,5 starts
automatically upon connection of power
supply. In case of these mixers - wait until a
% factor of the mixer valve opening has
been calibrated. During the calibration, servo
is closed for the time set in
Valve Opening
Time . Running calibration is indicated by
"KAL" in MENU Information , tab "Mixer-
Info",
- set other parameters of the mixer.
11.14 Connection of mixer pump
The HUW circulating pump may be connected
with the regulator in a few ways:
-
to the output "H" through a relay. The
condition to work is setting the service
parameter
Output H = circulating pump .
-
to terminals 21-22 instead of electric
servo of the mixer (the condition to work
is disconnecting the mixer sensor and
setting the service parameter
Mixer
support = OFF or Pump only ),
-
to additional module B,
11.15 Connection of boiler shunt pump
The boiler shunt pump should be connected
to output H through a relay. The condition to
work is setting the service parameter
Output
H = boiler shunt pump.