Installation Of Vibration Isolators; Shipping Braces; Pipework Connection - York MILLENNIUM YCAS Installation Operation & Maintenance

Installation
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.

INSTALLATION OF VIBRATION ISOLATORS

Optional sets of vibration isolators can be supplied loose
with each unit.
Using the Isolator tables (pages 76 - 82), refer to the
Technical Data Section, identify each mount and its cor-
rect location on the unit.
AWMR and CP-2 Mounts - 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 (located
just below the top plate of the mount) counter-clock-
wise 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. NOTE: A more
detailed instruction is provided on page 78.

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.
30
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 connection 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. For de-
tails refer to "Electrical Connection". This is to prevent
damage to the cooler caused by the unit operating with-
out 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".
Pipework and fittings must be separately supported to
prevent any loading on the cooler. Flexible connections
are recommended which will also minimize transmis-
sion of vibrations to the building. Flexible connections
must be used if the unit is mounted on anti-vibration
mounts as some movement of the unit can be expected
in normal operation.
Pipework and fittings immediately next to the cooler
should be readily de-mountable to enable cleaning be-
fore operation, and to facilitate visual inspection of the
exchanger nozzles.
The cooler must be protected by a
strainer, preferably of 30 mesh, fitted
as close as possible to the liquid inlet
connection, and provided with a
means of local isolation.
YORK INTERNATIONAL