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20,3 mm
32 mm
85 mm
85 mm 60 mm
Quick Installation Guide
1
4
3
2
L
L = 7...10 mm0,5 ... 1,5 mm2
0,5 ... 1,5 mm2L = 7...10 mm
Click
Vision® Wired
WT-D03 HC WT-D03 HCWT-A03 WT-A03 HC
Thermostats
24 - 230V
Connecting box
24 or 230V
Heat pump or boiler
Circulator
Confort / Reduced signal
Heat / Cool signal
Electrothermal actuators
24V or 230V
Environmental:
Operating temperature
Shipping and storage temperature
Power output
Temperature precision
Power supply
Sensor
Setting temperature range Comfort/Reduced
Antifreeze
Regulation type
Electrical protection
Security isolation
Class ERP
Energy efficiency gain
0°C to +40°C (32°F to +104°C),
- 10°C to +50°C (14°F to +122°C)
Live Triac, NO or NC
24VAC: Max. 5 actuators (1,6W / actuator)
230VAC: Max. 8 actuators (1,8W / actuator)
Peak of current : 4A max
0.1°C
From 24V to 240VAC 50Hz
Internal and/or external (in option) NTC 10kΩ at 2C
+7°C to +30°C (0.5°C step)
+7°C
Proportional Band 2°C (cycle=20min)
or Hysteresis ± 0.6°C
IP30
Class II
Level IV
2%
The descriptions and photographs contained in this document are supplied by way of example and illustration only. Watts
Industries reserves the right to carry out any technical and design improvements to its products without prior notice. Watts
hereby objects to any term, different from or additional to Watts terms, contained in any buyer communication in any form,
unless agreed to in a writing signed by an officer of Watts.
2012/19/EU: Products marked with this symbol cannot be disposed of as unsorted municipal waste in the European Union.
For proper recycling, return this product to your local supplier upon the purchase of equivalent new equipment, or dispose
of it at designated collection points. For more information see: www.recyclethis.info
Vision® Wired
wattwater.eu
Watts Electronics S.A.S
B.P. N°10 - Z.A. des Tourettes, 43800 ROSIERES, France,
T: +33(0) 471 57 40 49, F: +33(0) 471 57 40 90,
wattswater.eu
© 2023 Watts
PPLIMW15581Ac/WT-A03-HC-QIG-FR-W-ML-04-23
WFC-03 HC
Floor
sensor
limitation
Floor
sensor
limitation
Low High
Ext NTC Ext NTC
Ext NTC
min
x°C
+ + +
Ext NTC
+
max
OFF
10
15
20
25
30
35
40 OFF
10
15
20
25
30
35
40
OFF
10
15
20
25
30
35
40
x°C
+
OFF
N
L
Floor sensor Limitation
Type of regulation
Cooling authorization
Floor limitation setting
NC
NO
Hyst.
NcNo
High
Prop.
Fact. set
Low
Ext.
N L
Heat / Cool signal
Comfort / Reduced pilot wire
out L
OFF
10
15
20
25
30
35
40
1
4h
=
2 C
3
2
Min -> Max X2
X3
4
=
2 C =21°C21°C
2


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