33JOHNSON CONTROLS
FORM NO.: 6U6K-B01E-NB-EN
Consideration should be given to compressor and control panel
access when laying out water piping. Routing the water piping
too close to the unit could make compressor/ control panel
servicing/ replacement difcult.
Hand stop valves should be installed in all lines to facilitate
servicing.
Piping to the inlet and outlet connections of the
unit should include high-pressure rubber hose or
piping loops to ensure against transmission of water
pump vibration. The necessary components must be
obtained in the eld.
Drain connections should be provided at all low points to permit
complete drainage of the cooler and system water piping.
A small valve or valves should be installed at the highest point
or points in the chilled water piping to allow any trapped air
to be purged. Vent and drain connections should be extended
beyond the insulation to make them accessible.
The piping to and from the cooler must be designed to suit
the individual installation. It is important that the following
considerations be observed:
1.The chilled liquid piping system should be laid out so that the
circulating pump discharges directly into the cooler. The suction
for this pump should be taken from the piping system return
line and not the cooler. This piping scheme is recommended,
but is not mandatory.
2.Standard pipework connections are victaulic connections.
The inlet and outlet cooler connection sizes are 2” (YMAA/
YMPA 0045-0065), 2-1/2” (YMAA/YMPA 0080-0130) and 4”
(YMAA/YMPA 0160-0260) .
3.A strainer is integrated in the cooler inlet line just ahead of
the cooler. This is important to protect the cooler from entrance
of large particles which could cause damage to the evaporator.
4.All chilled liquid piping should be thoroughly flushed to
free it from foreign material before the system is placed into
operation. Use care not to flush any foreign material into or
through the cooler. It is recommended that a suitably sized by-
pass and valve arrangement be installed to allow ushing of the
pipework system. The by-pass can be used during maintenance
to isolate the cooler without disrupting ow to other units.
5.As an aid to servicing, thermometers and pressure gauges
should be installed in the inlet and outlet water lines.
6.The chilled water lines that are exposed to outdoor ambient
should be wrapped with supplemental heater cable and insulated
to protect against freeze-up during low ambient periods, and to
pre- vent formation of condensation on lines in warm humid
locations.
7.The cooler is protected by heater mats placed under the
insulation, which are powered from the unit control system
power supply. During cold weather when there is a risk of
freezing, unit power should be left switched on to provide the
freeze protection function unless the liquid systems have been
drained.
8.A chilled water ow switch is already installed in the leaving
water piping of the cooler. If the units are modularized, it is
recommended to install another flow switch in main liquid
leaving pipe. There should be a straight horizontal run of at
least 5 diameters on each side of the switch. Adjust the flow
switch paddle to the size of the pipe in which it is to be installed
(see manufacturer’s instructions furnished with the switch).
The Flow Switch MUST NOT be used to start and
stop the unit (i.e. starting and stopping the chilled
water pump). It is intended only as a safety switch.
PIPEWORK ARRANGEMENT
Most of the accessories are integrated for units with VSD
pumps. Strainer and flow switch are shipped loose for units
with xed speed pumps. Refer to Modular Connections if the
units are installed in a group.
SECTION 4 – INSTALLATION
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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