Euroclima ZHK, Manual

Page: 96 / 142

Instruction Manual ZHK
V07-21.0 95/140
NOTICE!
It must be ensured on site that all of the above-mentioned causes that can
lead to an increase in pressure in the duct system are avoided during com-
missioning and operation!
Unless otherwise stated, the assumed pressure situation in the ducts (suction and pressure side) for
the technical design is based on the specification of EN13053. The real pressure situation in the
ducts must be checked before commissioning. If there are any deviations, EUROCLIMA must be
contacted.
In principle there are different technical measures, which contribute to the prevention of inadmissible
pressure in the plate exchanger. One of these measures is described in
chapter 7.7.3
.
7.7.3 Pressure monitoring with differential pressure switch
Additionally, to the general measures, pressure monitoring could protect the plate exchanger against
damage caused by a steady pressure increase,
but not if the pressure increases abruptly.
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 197
to
Figure 200
.
-
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
electrically) as follows.
Airside connection of the pressure switch depending on the fan arrangement
Figure 197:
Supply air sucking, exhaust air pressing;
1 pressure switch (S), 2 measuring points (+/-)
Figure 198:
Supply air pressing, exhaust air sucking;
1 pressure switch (S), 2 measuring points (+/-)
Figure 199:
Supply air sucking, exhaust air sucking ;2
pressure switch (S), 4 measuring points (+/-)
Figure 200:
Supply air pressing, exhaust air pressing;
2 pressure switch (S), 4 measuring points (+/-)