A
ctuAtor
with
integrAted
regulAtor
, K282
for
r298
And
r298n
mixing
vAlve
0262EN
May 2013
047U31758
3
ISO
9001
0006/7
ISO
14001
0032A/2
OHSAS
18001
0064L/0
Installation
• Unscrew the hand-wheel protecting body before assembling and adjust
the shutter manually on R298 or R298N valve.
• Fix K282 actuator through its apposite brass fixing ring: the ring must be
screwed to the valve body up to end stroke in order to ensure max. stroke
to the shutter.
• Insert the immersion probe in a R227 pit, downstream of the secondary
circulator, and block by means of the fixing screw.
Positions of the linear stem of the actuator
The action of the digital regulator integrated in K282 actuator associates
the stem completely retracted to the position of complete closure (0%) as
shown in the picture; the stem completely protruding from the actuator
body is associated to the position of complete opening (100%).
Correct installation positions of K282 actuator
Dimensions
Compliance
- CE
- EMC 2004/108/CE
- Low voltage directive 2006/95/CE
Motorized manual control of the valve
The manual positioning (open ring) of the mixing valve is useful when
starting a system or in order to check the functioning. This operation can
be made with K282 actuator by extracting the apposite jumper on the
board, after removing the upper shell: the rotating potentiometer position
represents the required opening for the mixing valve in this manual state
of functioning. The opening of the direct way from the boiler of the valve
increases by rotating the potentiometer clockwise when Giacomini mixing
valves are used. The stem of the actuator is completely retracted (0%) and
the mixing valve closes the direct way completely (by-pass position), when
the rotating potentiometer is completely rotated anticlockwise; the stem
of the actuator is protruding (100%) and the mixing valve opens the direct
way completely, when potentiometer is completely rotated clockwise.
For the manual positioning:
• Remove 24 V~ supply to K282 actuator
• Loosen the actuator ring fixing to valve body and unscrew the actuator
completely
• Remove the upper shell of the actuator by removing the 4 fixing screws
• Extract the jumper placed on the electronic board as shown in the picture
• Position the upper shell of the actuator again through the 4 fixing screws
• Assemble K282 actuator on the valve body again
• Activate 24 V~ supply
• The actuator resets completely until it closes the direct way completely
(0%)
• The actuator positions at the indicated opening through the rotating
potentiometer.
When the functioning test is finished, follow the instructions and insert the
jumper placed on the electronic board.
1
2
3
4
6
7
8
2
1
1
2
1
2
3
4
6
7
8
1 Jumper for manual control (open ring) of the actuator
2 8 way microswitch for actuator addressing
Caution!
Manual positioning tests of the valve must be carried out once
the jumper on the electronic board has been extracted and
after assembling again and fixing with the 4 apposite screws the
upper shell of the actuator. Do not activate 24 V~ supply before
assembling the upper shell again. The manual positioning of the
valve must be carried out by qualified staff only.
Caution!
The reading of immersion delivery temperature probe is not taken
into account during the manual positioning test of the valve. Make
sure that the delivery temperature is not over or under the safety
limits according to the kind of system. The manual positioning of
the valve must be carried out by qualified staff only.
Retracted stem,
by-pass position of R298 valve
Protruding stem,
opening position of the
direct way of R298 valve
70
78
48
Dimensions in mm
