Technical data

4 INSTALLATION
4.1 Location
Before installing the unit, make sure
that the building structure and/or
mounting surface can support the unit
weight. Overall weights are detailed in
Section 9.
The unit has been designed for floor mounting in
protected indoor locations.
The installation site should ensure adequate
clearances and drainage for maintenance, refer to
Section 9 for details.
4.2 Evaporator External Water System
The external water hydraulic circuit must
ensure constant water flow to the
evaporator(s) under all operating or
adjustment conditions.
The external water system should consist of the
following:
n A circulation pump providing sufficient flow
and hydraulic head.
n
The primary system water content should be
no less than 10 litres per kW of cooling
capacity. If the total volume in primary system
pipework and evaporator is insufficient, an
insulated reservoir tank should be installed.
This tank will ensure that repetitive starts of the
compressors are avoided.
n
A diaphragm-type expansion tank with safety
valve outlet which must be visible.
The tank should be sized to
accommodate a 2% increase in total fluid
volume in the system (evaporator, lines,
user circuits and reservoir tank where
provided). The expansion tank does not
need to be insulated, as water does not
normally circulate therein.
n
A flow switch to deactivate the unit when water
is not circulating.
The flow switch must be connected in
series with other external interlocks. The
flow switch should be installed on the
pump delivery, upstream of the unit.
A Normally Open differential pressure switch may
be installed instead of the flow switch. The
pressure switch senses water pressure drop
across the evaporator.
In addition:
n
Install a filter/strainer on the inlet side of the
evaporator(s).
n
Install shutoff valves on the evaporator(s) inlet
and outlet water lines.
n
Install a valved by-pass around the
evaporator(s).
n
Install air vent valves at the highest points of
the lines.
n Provide suitable drainage points (with plugs,
cocks etc.) at the lowest points of the lines.
n Insulate the pipework to prevent heat loss.
Key
I Pressure R Drain tap
T Temperature F Strainer
S Gate valves F1 Flow switch
S1 By-pass valve
035B40022-000
4-1
S
SS
Evaporator
External Water System
T
T
I
I
S1
R
R
F1
F
S