Plate heat exchangers are only in limits pressure resistant. By a malfunction of
the system, the pressure in the plate heat exchanger section can rise unaccept-
ably high with the result of high costly damage. Use differential pressure switch!
The following factors cause pressure increasing:
-
Dampers are closed or open in delay.
-
Filters were not changed also if they already reached their final pressure drop.
-
The external pressure drop is higher than calculated.
-
Dampers in the duct system, unintended barriers, closed outlet grille or unfinished canal sys-
tems can lead to additional external pressures.
-
Only one fan is working (supply- or exhaust air), which can increase the pressure in some cas-
es.
TRANE provides as optional differential pressure switches, which shall be used as described be-
low:
-
For each fan, which can produce an unacceptably high pressure, a differential pressure switch
will be provided.
-
The switches are factory set to the maximum allowed differential pressure.
-
The differential pressure switch measures the differential pressure on the plate heat exchang-
er.
-
If the measured pressure is above the maximum allowed, the switch will switch of the respec-
tive fan motors. The switches are to connect as below described.
If no differential pressure switches are included in the delivery of TRANE (shown in the technical
data sheet), then another appropriate on site measure device must protect the plate heat exchang-
er from excessive pressure!
Differential pressure switch
If TRANE delivers the differential pressure switch, then they are factory mounted and set to the
correct pressure difference. The measuring tubes are pre-connected and may not be interchange.
The maximum allowable differential pressure according to the PHE manufacturer is indicated on
the technical data sheet.
In case of unintended adjustment of the differential pressure switch, contact the manufacturer or
TRANE for information about proper assembly and adjustment before starting the unit.
Electrical connection
The electrical connection of the fans must be done on site, that when exceeding the maximum al-
lowable differential pressure, the fan motors will immediately be disconnected from the power sup-
ply until the restart by hand. Example for connection diagram: refer to
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
Figure 122:
Electrical connection scheme
When the differential pressure switch was activated, the cause of the excessive pressure must be
found and eliminated before the restart.
Summary of Contents for CCEB
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