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Installation
When units are installed in an enclosure, the enclosure
height should not exceed the height of the unit on more
than one side. If the enclosure is of louvered construc-
tion the same requirement of static pressure loss ap-
plies as for ducts and attenuators stated above.
Where accumulation of snow is likely, additional height
must be provided under the unit to ensure normal air-
flow to the unit.
The clearance dimensions given are
necessary to maintain good airflow
and ensure correct unit operation. It
is also necessary to consider access re-
quirements for safe operation and
maintenance of the unit and power
and control panels. Local health and
safety regulations, or practical consid-
erations for service replacement of
large components, may require larger
clearances than those given in the
Technical Data Section, (page 74).
INSTALLATION OF VIBRATION ISOLATORS
Optional sets of vibration isolators can be supplied loose
with each unit.
Using the Isolator tables, refer to the Technical Data
Section (pages 74 - 83), identify each mount and its
correct location on the unit.
Installation
Place each mount in its correct position and lower the
unit carefully onto the mounts ensuring the mount en-
gages in the mounting holes in the unit base frame.
On adjustable mounts, transfer the unit weight evenly
to the springs by turning the mount adjusting nuts (lo-
cated just below the top plate of the mount) counter-
clockwise to raise and clockwise to lower. This should
be done two turns at a time until the top plates of all
mounts are between 6 and 12 mm (1/4" and 1/2") clear
of top of their housing and the unit base is level.
A more detailed installation instruc-
tion is provided on page 83.
28
SHIPPING BRACES
The chiller's modular design does not require shipping
braces.
PIPEWORK CONNECTION
General Requirements
The following piping recommendations are intended to
ensure satisfactory operation of the unit(s). Failure to
follow these recommendations could cause damage to
the unit, or loss of performance, and may invalidate the
warranty.
The maximum flow rate and pressure
drop for the cooler must not be ex-
ceeded at any time. Refer to the Tech-
nical Data Section for details.
The liquid must enter the cooler by the
inlet connection. The inlet connec-
tion for the cooler is at the far end of
the unit when viewed from the power
and control panels.
A flow switch must be installed in the customer
pipework at the outlet of the cooler and wired back
to the control panel using shielded cable. There should
be a straight run of piping of at least 5 pipe diameters
on either side. The flow switch should be wired to Ter-
minals 13 and 14 (see Figs. 12 and 13, pages 37 and
38). A flow switch is required prevent damage to the
cooler caused by the unit operating without adequate
liquid flow.
The flow switch used must have gold plated contacts
for low voltage/current operation. Paddle type flow
switches suitable for 10 bar (150 PSIG) working pres-
sure and having a 1" N.P.T. connection can be obtained
from YORK as an accessory for the unit. Alternatively
a differential pressure switch sited across an orifice plate
may be used, preferably of the high/low limit type.
The chilled liquid pump(s) installed in the pipework
system(s) should discharge directly into the unit cooler
section of the system. The pump(s) may be controlled
external to the unit - but an override must be wired to the
control panel so that the unit can start the pump in the
event that the liquid temperature falls below the mini-
mum setting. For details refer to "Electrical Connection."
YORK INTERNATIONAL
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