GRA311, Wilo Pump
GRA311, Wilo Pump

Circulation unit

GRA300

The ESBE series GRA300 is a circulation mixing unit which is intended for heating circulations where the outstanding flow and temperature control are required. Equipped with two shut-off valves with thermometers, check valve, high class insulation shell and high efficiency circulation pump. This compact unit is equipped with 3-way rotary progressive mixing valve and actuator. 

The Circulation Mixing Unit ensures best regulation performances independent from flow rate and low oversizing risk thanks to progressive valve characteristic, as well as the working possibility with most controllers available on the market.

  • Outstanding flow control thanks to the progressive characteristic of the valve
  • Ready to use with most controllers available on the market
  • High class insulation shell
  • Compact design
  • "Quick fit" connection between Valve and Actuator

Product range

GRA300 front_A-01
GRA311
GRA300 side_A-01
Series GRA311
Art.no.ReferenceDNPumpConnection IConnection JWeight kgNoteNTCNTC = National Trade Code
61043100GRA31120Wilo 15/7,5G ¾"G 1"4.5  

Installation support

Installation examples
GxA300_B-01
Installation instruction GRA300

Technical data

Technical data
Pressure class: PN 6 
Media temperature, max.: +110 °C
min.: 0 °C
Ambient temperature, max.: +50 °C
min.: 0 °C
Working pressure: 0.6 MPa
Connections: Internal thread (G): ISO 228/1 
External thread (G): ISO 228/1 
Insulation: EPP λ 0.036 W/mK 
Media, Heating water  (in accordance with VDI2035) 
Water/Glycol mixtures, max. 50 %
(above 20% admixture, the pump data must be checked)  
Water/Ethanol mixtures, max. 28 %
Material, in contact with water: Components of Brass, Cast iron, Steel 
Sealings material of: PTFE, Aramid fibre, EPDM 
EEI (Energy Efficiency Index), Wilo circulation pump: <0,21 
The integrated Mixing valve: Max. differential pressure drop: 100 kPa
Close off pressure: 200 kPa
Leakrate in % of flow*: <0.5 %
* Differential pressure 100kPa (1 bar) 
Characteristics: See diagram 
The integrated Actuator: Actuator type: ARA661 Quick fit 
Control signal: 3-point 
Power supply: 230 ± 10% V AC, 50Hz 
Power consumption: 5 VA
Running time 90°: 120 s
Enclosure rating: IP41 
Protection class: II 
The integrated Circulation pump: Type: Wilo RSTG 15/7,5 
Power supply: 230±10% VAC, 50/60Hz 
Cable length: 3 m
Power consumption: 4-75 W
Enclosure rating: IP X4D 
Insulation class: F 
EEI (Energy Efficiency Index): <0,21 
Characteristics: See diagram 
Conformity CE_A-01
LVD 2014/35/EU
EMC 2014/30/EU
RoHS 2011/65/EU
ErP2015_A-01
ErP2009/125/EC
ErP2015
$name
EnEV2014
Valve characteristics VRG430_RGB_GB_C-01
Circulation pump Wiring LTC100_A-01
The circulation pump should be preceded by a multi-pole contact breaker in the fixed installation.
GxA300_elkoppling PWM-01
Pumpspeed could be controlled by PWM signal
Constant speed GRA300 Constant dimensioning_A_en-01
Dimensioning, Pump Capacity diagram
Example: Start with the heating demand of heating circuit (e.g. 25 kW) and move horizontally to the right in the diagram to the Δt = 15°C (temperature difference between flow and return of the heating circuit). Next go up and find working point and read the available pressure of the pump on the left – ∆p = 62 kPa.
Variable pressure GRA300 Variable dimensioning_A_en-01

Accessories and spare parts

Options
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

GMA321

Manifold for 2 circulation units, without integrated hydraulic separator function.
66000500GMA321Manifold GMA321, DN20 Manifold for 2 units.

GMA331

Manifold for 3 circulation units, without integrated hydraulic separator function.
66000600GMA331Manifold GMA331, DN20 Manifold for 3 units.
Spare parts
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

GSP931

ESBE GSP931 Pump RSTG 15/7,5 Wilo
67003100GSP931Pump RSTG 15/7,5 Wilo    

GSP903

ESBE GSP903 Thermometer upgrade set, 2 pcs/package
67000600GSP903Thermometer upgrade set, 2 pcs/package    

GSP932

ESBE GSP932 PWM cable Wilo RSTG, 3m
67003900GSP932PWM cable Wilo RSTG, 3m    

GSP933

ESBE GSP933 Ball valves incl thermometer DN 20, 2 pcs/package
67003300GSP933Ball valves incl thermometer DN 20, 2 pcs/package DN20  

GSP930

ESBE GSP930 Insulation circulation unit DN 20
67003000GSP930Insulation circulation unit DN 20    

Download area

Find here direct related product information for download. If you don’t find your specific need here please look further into below mentioned "Quick links" or this website's “Search” and “Support” area.
Data sheet GRA300
Installation instruction GRA300
Certificate Declaration of Conformity, GRA300
Certificate Building Product Declaration BPD3, GRA300
Image GRA311, high res
2D Image GRA311
3D drawing (stp file) GRA311, DN20

Related products

GMA321
GMA300

GMA300

Series GMA300 is manifolds for 2 or 3 circulation units including insulation according to EnEV2014 and wall brackets.
GMA321

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