WIRING CONNECTIONS
CLIMATIC™50 –
Chiller / Heat Pump
–
Customer version
Page 7
CL50-CHILLER-IOM_CUST-0808-E
BMS COMMUNICATION
The communication
bus is connected to Climatic™
50 Serial Card daughter board on the BM50.
A star connection is not recommended, for an optimum operation it is advised to connect a maximum of two cables per unit.
In case of RS485bus, a resistance of 120
Ω 1/4W can be connecte
d on the last unit between the ter and -.
Connection must be carried out by the following cable:
Cable length up to 300m: AWG22 (0.34 mm ²), 2 pairs crossed with screen.
Cable length up to 1000m: LiYCY-P (0.34 mm ²), 2 pairs with general shield.
The cable length should not exceed 1000m.
For a better electromagnetic protection, LENNOX recommends the use of LiYCY-P cable.