Quantech QTC4 STYLE A Series, Установка, эксплуатация и обслуживание

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SECTION 4 - INSTALLATION
QUANTECH
37
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
4
VIBRATION ISOLATORS
Optional sets of vibration isolators can be supplied
loose with each unit.
Using the Isolator tables shipped with the unit in the
information pack. 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
engages in the mounting holes in the unit base frame.
On adjustable mounts, transfer the unit weight even-
ly to the springs by turning the mount adjusting nuts
(located 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 1/4" (6 mm) and 1/2" (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
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 evaporator must not be exceeded at
any time. Refer to SECTION 5 - TECHNI-
CAL DATE on page 57 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.
The liquid must enter evaporator at the
inlet connection. The standard inlet con-
nection 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 should be a straight run of piping of at least 5
pipe diameters on either side. The flow switch should
be wired 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 ad-
equate liquid flow.
The flow switch used must have gold plated contacts
for low voltage/current operation. Paddle type flow
switches suitable for 10 barg (150 PSIG) working pres-
sure and having a 1" N.P.T. connection can be obtained
from Quantech as an accessory for the unit. Alterna-
tively, a differential pressure switch fitted across an
orifice plate may be used, preferably of the high/low
limit type.
The chilled liquid pump(s) installed in the piping
system(s) should discharge directly into the unit evap-
orator section of the system. The pump(s) may be con-
trolled 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 which will also minimize
transmission 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.
Piping and fittings immediately next to the evaporator
should be readily de-mountable to enable cleaning be-
fore operation, and to facilitate visual inspection of the
exchanger nozzles.
The evaporator must be protected by a
strainer, preferably of 16 mesh, fitted as
close as possible to the liquid inlet con-
nection, and provided with a means of
local isolation.
The evaporator must not be exposed to flushing
velocities or debris released during flushing. It is
recommended 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 heat exchanger without disrupting flow to
other units.
Thermometer and pressure gauge connections should
be provided on the inlet and outlet connections of each
evaporator. Gauges and thermometers are not provided
with the unit and are to be furnished by others.
Drain and air vent connections should be provided at
all low and high points in the piping to permit drainage
of the system and to vent any air in the pipes.