Connection diagrams - Data Sheet - RDF400MB - RDF440MB - RDF460MB

N1

RDF400MB/RDF440MB/RDF460MB

L, N

AC 100...230 V power supply, mains and neutral

G, G0

AC/DC 24 V power supply

L1

Feed for relays AC 24...230 V

Q1, Q2, Q3 **

Fan control output (relay output), Q1-low，Q2-middle，Q3 -high (AC 100...230 V)

Y1 *

SPST relay output, 2-pipe cooling/heating, or 4-pipe heating, normally open (AC 100...230 V)

Y2 *

SPST relay output, 2-pipe with electric heater, or 4-pipe cooling, normally open (AC 100...230 V)

Y10

Control outputs "valve" DC 0...10 V, 2-pipe cooling/heating, or 4-pipe heating

Y20

Control outputs "valve" DC 0...10 V, 4-pipe cooling, and 2-pipe DC fan

Y50

Control output "Fan" DC 0...10 V

M

Input reference ground for D1 or DC fan reference

D1

Digital input, e.g., switch

MB+, MB- ***

Modbus terminals

REF

Modbus reference ground