Euroclima ZHK Series, Instruction Manual

Page: 89 / 131

Instruction Manual ZHK
88/129 V07-19.0
One possibility for pressure monitoring is a differential pressure switch. The usage is described as
follows:
-
Depending on the fan arrangement, one or two differential pressure switches must be provided,
see
Figure 187
to
Figure 190
.
-
The differential pressure switches monitor the differential pressures, which the plate heat ex-
changer is exposed to.
-
If the measured pressure exceeds the admissible, adjusted value, the differential pressure switch
shuts off the concerned fan motors. For this purpose, the switches must be installed (airside and
electrical) as follows.
Airside connection of the pressure switch depending on the fan arrangement
Figure 187:
supply air sucking, exhaust air pressing;
1 pressure switch (S), 2 measuring points (+/-)
Figure 188:
supply air pressing, exhaust air sucking;
1 pressure switch (S), 2 measuring points (+/-)
Figure 189:
supply air sucking, exhaust air sucking ;2
pressure switch (S), 4 measuring points (+/-)
Figure 190:
supply air pressing, exhaust air pressing;
2 pressure switch (S), 4 measuring points (+/-)
Electrical connection
The electrical connection of the fans must be done on site, that means it is in the area of responsibility
of the customer, that when exceeding the maximum allowable differential pressure, the fan motors
will immediately be disconnected from the power supply until the restart by hand. For an example
for connection diagram: refer to
Figure 191
.
Figure 191:
Electrical connection scheme
K
P
M
3

L 1
L 2
L 3
N
K
K
Stop
KH
K
230 V
Start
KH
Reset
Betriebsmeldung
KH
Alarm
0 V
KH