EQKC COMBI COOLER
FläktGroup
DC_8931GB 20180202_R0
We reserve the right to make changes without prior notice
Installation and maintenance instructions
6
Aeration
All valves must be opened / closed several times during
aeration for all trapped air to escape. Since the subsystems
are connected in common water system will not be any part
of the work unless the aeration is performed correctly.
Brine connections – general
Connected pipes are to have as few bends and variations in
size as possible. If the pressure drop is too high, the pump
will not provide the design flow, leading to insufficient heat
transfer in the heat exchangers. Ensure that the pipe system
is flushed and drained before connection to the cooling unit.
Automatic or manual bleed valves
Automatic or manual bleed valves must be installed in enough
places to bleed the system.
Drain valve
The drain valve must be installed at the lowest point in
order to drain the system.
Leakage testing
A leak tightness test must be carried out before insulating
the pipes.
Expansion forces on the connections
All connections for the brine and the external heating system
outputs on the cooling unit must be made in such a way that
there are no forces acting on them caused by the thermal ex-
pansion of the pipes.
Leakage testing
A leak tightness test must be carried out before insulating
the pipes.
Insulating the pipes
All pipes must be insulated to prevent condensation. The insu-
lation must be diffusion tight. It must be possible to access
bleed valves and drain valves following insulation.
Filter (max. gauge = 500 μm)
It is essential that the water is free of impurities. If not the heat
transfer in the heat exchangers will be reduced as they get
dirty. In the worst case the exchanger can be permanently
damaged. The filter should be mounted on the water circuit’s
inlet to the cooling unit, in a position where it can be easily
flushed or replaced.
For simplicity’s sake there should be shut-off valves on both
sides of the filter.
Brine
The cooling unit is designed for pure water. In other words,
there should be no additives in the water.
Expansion tank
The expansion tank should be installed in a suitable location.
ADJUSTING THE FLOW SWITCH
The function of the flow switch is to stop the compressors if
the brine flow drops below a critical level or stops completely.
Because every cooling unit undergoes pre-delivery testing,
the flow switch is factory set. Testing is carried out at the flow set
out in table 1. However, this adjustment must still be checked
due to possible differences in flow measurement methods.
Actual flow: Green LEDs
Alarm limit: Orange LED
Triggered alarm: Red LED
Step 1 – Calibrate the flow switch
1. Check that the brine flow is the intended operating flow.
2. Press the right button (black arrow) for five seconds.
3. The flow switch is now calibrated.
Step 2 – Setting the alarm limit
Set the alarm limit (orange LED) by pressing the black or
white arrow. The alarm limit is recommended to be set
about 2-3 LEDs below the top green LED.
Important!
Aeration must be made of all subsystems.
