Notes And Tables In Common Of Wiring Diagrams - Alpha Pro Tec 90NX Design, Installation And Servicing Instructions

1.15 NoTEs aND TablEs IN commoN of WIrING DIaGrams

The notes and tables below apply to all diagrams in Fig. 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31.
For low-temperature zones, insert a safety thermostat in series with the relevant zone pump.
Remove the X40 link wire in case of connection:
* cascade and zone regulator
* 0-10V
* BMS
* BUS OT
* Some types of CH demand (parameter "CH Request type", menu "HYDRAULIC SETTINGS")
* Room thermostat ON/OFF
components
* B1-2
* B2
* B3
* S50
* 0-10V
* B4
* S20-1
* S20-2
* OpenTherm
* External reset
* A27
Screw terminal blocks for electrical connection (loads) accept a maximum cable cross-section of 1.5 mm
0.5 mm .
2
multi-function relays
K70-A2/K70-A3
- K70-A4/K70-A5
K70-A1
K70-A6/K70-A7
OpenTherm:
- When using an OpenTherm thermostat, set the parameter "CH Request type" as "Room thermostat setpoint";
- ensure that the OpenTherm thermostat is compatible with the boiler.
When configuring the mixing valve, use the relays on the main board (relays K70-A1 to K70-A5) or on the display board (relays
K70-A6 and K70-A7).
Do not use a relay on the main board and one on the display board.
Electrical connections (signals)
cable cross-section (mm
minimum
0,5
maximum loads on relays of boards a2 and a4
voltage
230 Vac
Potential-free contact
(230 Vac MAX)
)
2
cable diameter (mm)
maximum
1,5
J-Y(ST)Y 2x0,6
current
< 0.1 A
< 0.1 A
maximum length (mm)
25 (2x25)
5 - 7
50 (2x50)
10 (2x10)
50 (2x50)
and a minimum of
2
cosϕ Notes
From factory settings, K70
≥ 0,6 relays do not perform any
functions.
≥ 0,6 Insert an optional external
relay to drive each load.
25