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Form QTC4-NM2
Issue date: 05/12/2023
Vibration isolators
Optional sets of vibration isolators can be supplied
loose with each unit.
Use the isolator tables shipped with the unit in the in-
formation pack. Identify each mount and its correct lo-
cation on the unit.
Installing vibration isolators
1. Place each mount in its correct position.
2. Lower the unit carefully onto the mounts ensuring
the mount engages in the mounting holes in the
unit base frame.
3. On adjustable mounts, transfer the unit weight
evenly to the springs by turning the mount ad-
justing nuts, which are located just below the top
plate of the mount, counterclockwise to raise and
clockwise to lower.
4. Do this two turns at a time until the top plates of
all mounts are between 1/4 in. (6 mm) and 1/2 in.
(12 mm) clear of top of their housing and the unit
base is level.
Shipping braces
The chiller's modular design does not require shipping
braces.
Chilled liquid piping
The following piping recommendations are intended
to ensure satisfactory operation of the units. 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 evaporator must not be exceeded at
any time. See Section 5 - Technical data
on Page 65, for details.
The Maximum acceptable chilled liquid
pressure in the inlet of evaporator is same
as the statement in Maximum Tube Side
Pressure of Pressure Vessel Name Plate
for QTC4 with Falling Film Evaporator.
Quantech
The liquid must enter the evaporator at
the inlet connection. The standard inlet
connection for the evaporator is opposite
the control panel end of the evaporator.
A flow switch must be installed in the
customer piping at the outlet of the
evaporator and wired back to the control
panel using shielded cable.
There must be a straight run of piping of at least
5 pipe diameters on either side. Wire the flow switch
to Terminals 2 and 13 on the 1TB terminal block. A
flow switch is required to prevent damage to the
evaporator caused by the unit operating without
adequate liquid flow.
The flow switch used must have gold plated contacts for
low voltage or current operation. Paddle type flow switch-
es suitable for 10 bar (150 psig) working pressure and
having a 1 in. N.P.T. connection can be obtained from
Quantech as an accessory for the unit. Alternatively, a
differential pressure switch fitted across an orifice plate
may be used, preferably of the high/low limit type.
Another alternative flow switch is a thermal dispersion
flow switch.
The chilled liquid pumps installed in the piping sys-
tems must discharge directly into the unit evaporator
section of the system. The pumps may be controlled by
the chiller controls or external to the unit.
Pipework and fittings must be separately supported to
prevent any loading on the evaporator. Flexible con-
nections are recommended that can also minimize
transmission of vibrations to the building. User flexi-
ble connections if the unit is mounted on anti-vibration
mounts, as some movement of the unit can be expected
in normal operation.
Ensure piping and fittings immediately next to the
evaporator are readily de-mountable, to enable cleaning
before operation and to facilitate visual inspection of
the exchanger nozzles.
The evaporator must be protected by a
strainer, preferably of 3.2 mm or lower size
perforations, fitted as close as possible to
the liquid inlet connection, and provided
with a means of local isolation.
The evaporator must not be exposed to flushing veloci-
ties or debris released during flushing. It is recommend-
ed that a suitably sized bypass and valve arrangement
is installed to allow flushing of the piping system. The
bypass can be used during maintenance to isolate the
Section 4 - Installation
4
31
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