CONTECA
®
EASY ULTRA meter electrical connections
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
A
A
A
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
24 V (ac)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RS48
5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Cooling unit
s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
digital inpu
t
A
B
Heating units
4
th
pulse inpu
t
3
rd
pulse inpu
t
pulse input
blue wire
white wire
For box or direct wall mounting, use the screws provided and insert them into the corresponding holes
A
Pins
Description
Accessory
1 – 2
OUT 2 - Open collector pulse output for COOLING UNITS. GND=2 / duration 120 ms / Vmax 24 V (dc) - 50 mA
755882
2 – 3
OUT 1 - Open collector pulse output for HEATING units. GND=2 / duration 120 ms / Vmax 24 V (dc) - 50 mA
755881 –
755882
4
NOT used
5 – 6
IN 4 - fourth pulse input (generic). GND=6
2 x 755825
6 – 7
IN 3 - third pulse input (generic). GND=6
755825
8 – 9
IN 2 - Pulse input for DCW. GND=9
9 – 10
IN 1 - Pulse input for DHW. GND=9
11 – 12
Heating/cooling flow meter pulse input
(polarised, see page 6)
13 – 14
Digital input (MUST be with voltage-free contact)
15 – 16
Electric supply 24 V (ac) 50 Hz - 1W
17 – 18
Transmission BUS RS-485 / RS-485 A=18 / RS-485 B=17
5
