R298-0529 GIACOMINI | Alldatasheet

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Technical content

3-wa y mixing val ve with bonnet R298 F.C.F.O. 34 0,5 21000 800 600 500 400 300 200 100 Q [l/h] ∆p [mm H2O] 8090 100 200 300 400 500 600 700 800 900 1000 Opening Shutter Kv (direct + by-pass) Primary side flow rate Qp By-pass flow rate Qbp Fully Closed (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 % Fully open (F.O.) 1,78 100 % 0 % Table 1 Operation R298 + handwheel for manual operation The 3-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 actuator connection. By-pass 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. By-pass 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 fluid in radiant heating and cooling systems for floors 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 K281 actuator for automatic control. Versions and product codes Product code Connections Actuator connection Center distance [mm] R298Y027 G 1-1/2”M x G 1-1/2”F M30 x 1,5 mm (red handwheel) 120 Completion codes

  • Actuator K281 Accessories
  • P19Y001: ring nut M30 x 1,5 mm for adapting valve R298 M28 x 1,5 mm threading.
  • P19Y002: ring nut M28 x 1,5 mm for adapting valve R298 M30 x 1,5 mm threading. Technical data
  • Fluid: water for HVAC systems
  • Max. working temperature: 90 °C
  • Max. working pressure: 10 bar
  • Maximum differential pressure: 1,2 bar
  • Center distance: 120 mm
  • Connections: 1-1/2” flat seat
  • Mixing: through bonnet DN20, which is normally closed on the primary side Materials
  • Body, bonnet and nut in brass CW617N - UNI EN12165
  • EPDM sealings Losses of pressure In Table 1, values in Kv and mixing percentage ratios (between the by-pass "QBP" flow rate and the primary side "Qp") corresponding to the various opening positions are displayed. SYSTEM SIDE BOILER ROOM SIDEQp Qbp R298

3-wa y mixing val ve with bonnet R298 Installation

  • The R298 valve must be installed according to the direction of flow 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.
  • Application with low temperature water: should you expect the realization of installations where the primary circuit is characterised by low temperature (i.e. condensig boilers operating at low temperature) on the by-pass way the calibrated diaphragm (A) shall be inserted. In these applications, the presence of this element is fundamental for the correct balance of the deliveries of the primary and secondary circuits, characterised by a reduced temperature diffrence. A A Dimensions G A L I B B G KK JJ D E F Product code G B A [mm] I [mm] L [mm] D [mm] E [mm] F [mm] K [mm] J [mm] R298Y027 G 1-1/2” MG 1-1/2”F 59 120 209 28 50 104 41 53 M N Product code M [mm] N [mm] K298Y027 + K281X002 113 255 K298Y027 + K281X012 115 265 Product specifications R298 3-way mixing valve with bonnet, with 1-1/2” flat 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 series actuator. Additional information For additional information please check the website: www.giacomini.com or contact the technical service: ' +39 0322 923372 6 +39 0322 923255 * consulenza.prodotti@giacomini.com This pamphlet is merely for information purposes. Giacomini S.p.A. retains the right to make modifications 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