Table 1: External connections
Ter-
minal
block
Description
Remark
PE
Ground
N
N
Earthed neutral (supply voltage)
L1
L1
Phase (supply voltage)
L2
L2
Phase (supply voltage)
L3
L3
Phase (supply voltage)
400V 3N~, 50Hz,
supplied via safety
switch
28
G
By-pass damper”DBEH” exhaust air (option)
24V AC
29
GO
By-pass damper ”DBEH” exhaust air (option)
Neutral (24 VAC)
The already prepared operating cable in Topvex SoftCooler is to be drawn to the electrical cabinet in the
supply part of the Topvex air handling unit and connected to the terminal blocks with the same numbers
as the cable markings.
Table 2: Internal connections
Ter-
minal
block
Description
Remark
G
G
24V AC
4
DI ref
Referens
10
DO ref
Referens
12
DO
Exhaust air damper. A signal from control unit E28 is
lead via the relay R2 to terminal 28 for controlling of
the by-pass damper (accessory).
24V AC, 0.5A
14
DO
A signal from control unit E28 for starting "P1-cooling"
indicates a cooling demand. The signal controls
relay R2 that is then closing the by-pass damper
(accessory).
24V AC, 0.5A
15
DO
A signal from control unit E28 for starting "DX cooling
step1" indicates a cooling demand. The signal
controls relay R1 that is then starting the compressor.
24V AC, 0.5A
74
DI
Alarm indication cooling (
Run Error P1-Cooler
).
NO
90
AO ref
Reference
94
AO
Control signal from control unit E28 for cooling.
Controls the frequency converter "FC".
0-10V DC
Installation instructions
208767
15
Systemair Sverige AB