User Manual

Siemens Building Technologies CE1N2821E / 29.11.1998
Landis & Staefa Division 7/8
General data
Operating voltage (safety extra
low voltage to EN 60730) AC 24 V
Frequency 50 Hz
Power consumption 3.2 VA
Degree of protection to EN 60529 IP52
Safety class to EN 60730 III
Electromagnetic compatibility
Immunity EN 50082-2
Emissions EN 50081-1
Perm. ambient temperatures
Operation 5...50 °C
Transport and storage -25...+65 °C
Mounting length 110 mm
Connecting thread 1"
Fittings (ALG81) 1" - ¾"
Length of connecting cable
to the conduit box 1 m (fixed)
to the flow temperature sensor 1.5 m (fixed)
to terminal P1 (pulse source) max. 10 m
Weight 2.1 kg
Max. flow temperature 80 °C
Min. flow temperature 20 °C
Max. return temperature 80 °C
Min. return temperature 20 °C
Max. temperature differential 60 K
Min. temperature differential 2 K
Overload range
Max. pressure drop across valve 900 mbar
Max. heating medium
temperature (short-time) 90 °C
Max static pressure 10 bar (PN10)
Min. static pressure 0 bar
Error limits to OIML, Class 5
Water quality to VDI 2035
Conductance < 150 µS/cm
Oxygen (O
2
) < 0.2 mg/l
Alkaline earths (Ca + Mg) < 0.02 mg/l
Phosphate (PO
4
) < 2.5 mg/l
Hydrogen sulphide (H
2
S) < 0.1 mg/l
Specific flow values
WRV81.200
Nominal flow rate 200 l/h
Max. flow rate 200 l/h
Min. flow rate 25 l/h
Flow rate display range 20...300 l/h
Max. pressure drop at
nominal flow 120 mbar
WRV81.400
Nominal flow rate 400 l/h
Max. flow rate 400 l/h
Min. flow rate 50 l/h
Flow rate display range 40...600 l/h
Max. pressure drop at
nominal flow 120 mbar
WRV81.750
Nominal flow rate 750 l/h
Max. flow rate 750 l/h
Min. flow rate 90 l/h
Flow rate display range 75...1125 l/h
Max. pressure drop at
nominal flow 120 mbar
WRV81.1500
Nominal flow rate 1500 l/h
Max. flow rate 1500 l/h
Min. flow rate 180 l/h
Flow rate display range 150...2250 l/h
Max. pressure drop at
nominal flow 150 mbar
B1 Room unit QAW...
N1 Central unit OZW30 or bus power pack TRW30
P1 Any non-SYNERGYR meter with a pulse source (e.g. for d.h.w.)
U1 Pulse adapter AEW2.1
X1 Conduit box ALW30
Y1 Control and heating cost allocation valve WRV81...
Technical data
Connection diagram
Colour coding
of cable
G1 white
G2 brown
MB blue
DB pink
D1 grey
MD green
P1 yellow
2821A01
G2
MB
DB
G1G2
G1
N1
G2G1 MB DB
G2G1 MB DB
G2G1 MB DB D1 MD P1
Y1
U1
B1 P1
X1
D1 MD P1
D1 MD P1
G2G1
MB DB D1 D2 M P1
AC 24 V