Product Overview

Warning : ZM.../A terminal housing used with DC 0 ... 20 V phase cut signals:
•
Do not connect AC 24 V to Terminals 1 and 2.
•
Connect Terminal 5, (marked " – ")
–
to the appropriate Y output terminal on UNICO, KLIMO and MULTIREG
(type 9 controllers)
–
to Terminal 2 on type NKOA terminal modules.
ZM101/A
(DC 0 ...10 V or DC 0 ... 20 V phase cut)
ZM111
(DC 0 ... 20 V phase cut)
40550 B
1
2
3
4
5
6
~
~
–
+
Supply
AC 24 V
Control signal
DC 0 ...10 V
40551 C
1
2
3
4
5
6
–
+
DC 0 ... 20 V
phase cut
40553 B
1
2
3
4
5
6
DC 0 ... 20 V
phase cut
ZM121/A
(DC 4 ...20 mA or DC 0 ... 20 V phase cut)
40550 B
1
2
3
4
5
6
~
~
–
+
Supply
AC 24 V
Control signal
DC 4... 20 mA
40551 C
1
2
3
4
5
6
–
+
DC 0 ... 20 V phase cut
Twisted pairs
See data sheet N4591 for various connection diagrams for the ZM... and ZM.../A
terminal housing.
The diagrams shown here are principles only, without installation-specific details.
For accurate control of evaporators, from 0 ...100% refrigeration capacity.
•
Suitable for test rooms, laboratory systems, small chilled water units and DX
evaporators with a refrigeration capacity of up to approx. 40 kW.
Recommended presure drop
∆
p
v100
across the fully-open valve (control path 1 –> 3) :
between 0.5 and 1 bar
(see selection chart page 4)
94.0238A
+
–
1
3
2
Example :
Refrigeration capacity Q
o
Refrigerant
Condensation temperature t
c
Evaporation temperature t
o
Liquid temperature t
fl
Selected valve
Pressure differential
∆
p
v
across valve
24 kW
R22
40 °C
+ 5 °C
35 °C
M3FB15LX/A
0.7 bar
Connection
terminals
Connection diagrams
Application examples
3-way hot-gas
bypass control
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