National Lab OCGE 111, Operating And Maintenance Manual

Page: 13 / 194

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5.2 ASSEMBLY (CONNECTIONS)
5.2.1 CONNECTION TO THE REFRIGERANT CIRCUIT (CONSUMER CIRCUIT)
All work may only be carried out by specialist personnel!
Procedure:
-
In closed systems, make sure that the maximum obtainable cooling medium pressure in the supply
line does not cause a higher pressure level than the maximum permitted for the chiller.
-
Check the cleanliness of the supply line and the piping system to be connected.
-
Connect the chiller with the consumer circuit; the identification of the joints (cooling medium in-
let/outlet) is indicated on the chiller by means of the symbols described in the introduction to the
manual.
-
Make all the connections, without rotating the sleeves located on the hose.
The cooling medium circuits of the Series PCGE and PCGEZ with tank are open to the at-
mophere as standard!
Use piping, connections and fastening components with a cross-section to match the capacity of the chiller and the
possible volume flow. This should not be smaller than the diameter of the chiller connections.
In the case of rigid connections, check during the initial start-up of the chiller that it is not subject to any vibrations
that might endanger the integrity of the components.
We also recommend that you should plan to install the following system components:
Ü
A bypass system with suitable valves upstream and downstream of the chiller. This is intended to allow use
of the consumer circuit if you have to remove the chiller from the circuit, switch it off or use it in different
ways at the same time
.
Ü
A pipeline system with integrated filter near the chiller to protect the pump against solid matter and avoid
deposits on the heat exchangers. The recommended mesh width for the chillers is 25 µ with a maximum
pressure loss at the filter of 1 bar . The use of a filter with a mesh width of 60 µ is particularly suitable for
chillers of the OGCE series if they are fitted with a gear pump, so as to avoid unusual wear of the compo-
nent.
Ü
In the models without flow monitoring, we suggest that you should install such a component if the system
exhibits losses or very high cooling medium consumption due to evaporation or intervention by the opera-
tor. A further reason may be triggering of the solenoid valve to shut down the system. The flow meter may
trigger an alarm and enable immediate operator intervention.
Ü
On no account may the total pressure loss of the system exceed a value above that of the pump perfor-
mance.
Ü
Another option for directly filling the tank involves attaching a T-fitting to the cooling medium outlet fitting
in order to connect the cooling medium circuit with a supply pipe. This is used to fill the chiller. We also
recommend connecting a valve to the supply pipe in order to stop the flow when the tank is full or to re-
start the flow as soon as a top-up is necessary.
Fig.1
A Male-male fitting
B From the supply line
C To the consumer cooling circuit
D T-fitting
E Connecting piece to cooling medium outlet