Atag i28C Technical Guide

1
1
CN15
F2
1
CN17
1
CN16
CN2
1
CN10
1
CN9
1
CN3
1
CN12
CN6
F1
1
CN1
CN14
CN13
1
FAN 325V DC
1 2 3 4 5
IGNITION
6,3 4,0
4 3
2 1
3 2 1
230V POWER SUPPLY CABLE
N L
IONISATION
GAS VALVE
1
1
1 2 3 4 5
1 2 3 4 5
FUSES 250V 2,5AT (2x)
FLOW SENSOR T1
RETURN SENSOR T2
1 K0
1 K0
CN4
E N L E L N SwL
230V out
230V Control
L N
230V out
L N E
230V in
1 2 3 4
1 2 3 4
1 2
3 2 1
1 2 3
1 2 3
OUTDOOR SENSOR T4
(OPTION)
K 1
ATAG ZONE
(OPTION)
OPEN THERM OR ON/OFF
THERMOSTAT (OPTION)
PUMP
3 WAY VALVE
(INTERNAL)
WATER FLOW SENSOR
WATER PRESSURE SENSOR P1
TOP HMI
DHW SENSOR T3
10K
OUTSIDE THE BOILER
PLUG FUNCTION
COMPONENT
CONNECTION No.’S
VOLTAGE RESISTANCE
CN12 (3-5)
Water flow sensor
No demand
1 - 2 4.9v DC
1 - 3 4.9v DC
2 - 3 0v DC
Water flow sensor
DHW demand
1 - 2 4.9v DC
1 - 3 2.5v DC
2 - 3 2.3v DC
R29 (3,4) Flow sensor T1 1 - 2 10KΩ@ 25°C
R29 (1,2) Return sensor T2 3 - 4 10KΩ@ 25°C
CN1 (1,2) External safety contract (link wire) White 0KΩ
CN1 (3,4) DHW cylinder sensor Yellow (DHW) 10KΩ@ 25°C
CN1 (7,8) OpenTherm BUS & ON / OFF connection Blue 22v DC
CN3 (1,2) ATAG BUS connection Red 20v DC
CN3 (5,6) Outside sensor T4 option Peach (Out) 1KΩ@ 25°C
CN12 (1,2) DHW sensor T3 10KΩ@ 25°C
CN12 (6 -8) Water pressure sensor P1 (@ + 1.0bar)
8 - 9
5 - 6 32v DC
5 - 7 22v DC
CN2 (5,6,7,9) Actuator 3 way valve
DHW on CH on
1 - 2 230v AC 0v AC
1 - 3 0v AC 169v AC
1 - 4 0v AC 0v AC
2 - 3 230v AC 230v AC
2 - 4 0v AC 230v AC
3 - 4 0v AC 0v AC
CN12 (1, 5) Fan
CN2 (1, 2) Gas valve 1 - 2 230v AC
CN2 (3, 4) Spark generator (ignition) 4 230v AC
Electrical functions
49

Atag i28C Specifications

General

Brand	Atag
Model	i28C
Category	Boiler
Language	English