Giacomini R298 Series User manual

1
0529EN April 2015
Mixing valves
Three-way mixing valve wiTh bonneT
r298
ISO
14001
0032A/3
OHSAS
18001
0064L/1
ISO
9001
0006/7
F.C.F.O. 34
0,5
1
2
1000
800 600 500 400 300 200
100
Q [l/h]
∆p [mm H2O]
80 90 70 60 50 40 30 20 10
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
Opening
Shutter
Kv
(direct + by-pass)
Primary side
ow rate Qp
By-pass
ow rate Qbp
F.C. 3,25 0 % 100 %
0,5 mm 3,48 11 % 89 %
1 mm 3,79 18 % 82 %
2 mm 3,78 29 % 71 %
3 mm 3,12 44 % 56 %
4 mm 2,35 74 % 26 %
F.O. 1,78 100 % 0 %
Table 1
Operation
R298 + handwheel for manual operation
The three-way R298 mixing valve is equipped with a handwheel to allow for
manual operation, which are carried out via a simple clockwise rotation for
the valve opening and anticlockwise for closure.
Total opening of the bonnet, and therefore of the primary side supply, is
obtained by screwing down the handwheel, while unscrewing it fully frees
the thread for the drive motor connection.
bypass Direct
SYSTEM SIDE
BOILER ROOM
SIDE
SYSTEM SIDE
BOILER ROOM
SIDE
clockwise
rotation
anticlockwise
rotation
SYSTEM SIDE
BOILER ROOM
SIDE
SYSTEM SIDE
BOILER ROOM
SIDE
clockwise
rotation
anticlockwise
rotation
R298 + K281 actuator for automatic operation
The handwheel can be replaced with a K281 actuator for automatic mixing
adjustment, in combination with electronic thermoregulation. The K281
actuator is mounted manually, by screwing the brass ring nut in a clockwise
direction until it stops. This does not require the use of any tools.
bypass Direct
SYSTEM SIDE
BOILER ROOM
SIDE
SYSTEM SIDE
BOILER ROOM
SIDE
SYSTEM SIDE
BOILER ROOM
SIDE
SYSTEM SIDE
BOILER ROOM
SIDE
Description
The R298 mixing valve allows for the interception and mixing of heating uid
in radiant heating and cooling systems for oors or ceilings and in medium-
size radiator heating systems that require precise control of water delivery
temperature. The R298 valve is equipped with a handwheel for manual
operation, or alternatively, it can be coupled to a K274 actuator for automatic
control.
Versions and product codes
Product code Connections Actuator connection Center distance [mm]
R298Y001 1 1/2” M x 1 1/2” F M28 x 1,5 mm
120
R298Y027 1 1/2” M x 1 1/2” F M30 x 1,5 mm
Completion codes
• Actuators K281 or K282
Accessories
• P19Y001: ring nut M30x1,5 mm for adapting valve R298 M28x1,5 mm
threading.
• P19Y002: ring nut M28x1,5 mm for adapting valve R298 M30x1,5 mm
threading.
Technical data
• Heating uid: water for air-conditioning systems
• Max. working temperature: 90 °C
• Max. working pressure: 10 bar
• Maximum dierential pressure: 1,2 bar
• Center distance: 120 mm
• Connections: 1 1/2”at seat
• Mixing: by bonnet DN20, which is normally closed on the primary side
Materials
• Body, bonnet and nut in brass CW617N - UNI EN12165
• EPDM sealing rings
Losses of pressure
In Table 1, values in Kv and mixing percentage ratios (between the by-pass
"QBP" ow rate and the primary side "Qp") corresponding to the various
opening positions are displayed.
SYSTEM SIDE
BOILER ROOM
SIDE
Qp
Qbp
R298

2
0529EN April 2015
Mixing valves
Three-way mixing valve wiTh bonneT
r298
ISO
14001
0032A/3
OHSAS
18001
0064L/1
ISO
9001
0006/7
Installation
• The R298 valve must be installed according to the direction of ow as
indicated by the arrow present on the valve body.
• The R298 valve must be installed on the delivery side. The circulator on the
secondary circuit must be installed downstream from the mixing valve.
System
terminals
R298
Circulator
• The R298 valve can be installed in a vertical position with the actuator to the
right or left, or in a horizontal position with the actuator above.
Horizontal downward facing installation of the valve is not permitted.
Dimensions
G
A
L
I
B B
G
KK
J
J
D
E
F
Product
code G B A
[mm]
I
[mm]
L
[mm]
D
[mm]
E
[mm]
F
[mm]
K
[mm]
J
[mm]
R298Y001 1 1/2”
M1 1/2”F 59 120 209 28 50 104 41 53
R298Y027
M
N
Product code M
[mm]
N
[mm]
R298Y001/K298Y027 +
K281X002/K282X002 113 255
R298Y001/K298Y027 +
K281X012/K281X022 115 265
Product specications
R298
Three-way mixing valve with bonnet, with 1 1/2”at seat connections and by-
pass. Body, bonnet and nut in brass UNI EN 12165 CW617N. Handwheel with
protection and manual operation functions. Max. working temperature 90 °C.
Max. working pressure 10 bar. Center distance of 120 mm. Can be motorized
by installing the K281 or K282 series actuator.
Additional information
For additional information please check the website: www.giacomini.com or contact the technical service: '[phone]+39 0322 923255 *[email protected]
This pamphlet is merely for information purposes. Giacomini S.p.A. retains the right to make modications for technical or commercial reasons, without prior notice, to the items described in
this pamphlet. The information described in this technical pamphlet does not exempt the user from following carefully the existing regulations and norms on good workmanship.
Giacomini S.p.A. Via per Alzo, 39 - 28017 San Maurizio d’Opaglio (NO) Italy