Quantech QTC3040T, Installation Operation & Maintenance

Page: 36 / 190

QUANTECH
36
FORM QTC3-NM1
ISSUE DATE 08/03/2022
SECTION 4 – INSTALLATION
SPRING ISOLATORS (OPTIONAL)
When ordered, isolators will be furnished. Identify the
isolator, locate at the proper mounting point, and adjust
per instructions.
COMPRESSOR MOUNTING
The compressors are mounted on four rubber isolators.
The mounting bolts should not be loosened or adjusted
at installation of the chiller.
CHILLED LIQUID PIPING
General – When the unit has been located in its fi-
nal position, the unit water piping may be connected.
Normal installation precautions should be observed in
order to receive maximum operating efficiencies. Pip-
ing should be kept free of all foreign matter. All chilled
water evaporator piping must comply in all respects
with local plumbing codes and ordinances.
Since elbows, tees and valves decrease pump capacity,
all piping should be kept as straight and as simple as
possible. All piping must be supported independent
of the chiller.
Consideration should be given to com-
pressor access when laying out water pip-
ing. Routing the water piping too close to
the unit could make compressor servicing/
replacement difficult.
Hand stop valves should be installed in all lines to fa-
cilitate servicing.
Piping to the inlet and outlet connections of the chiller
should include high-pressure rubber hose or piping
loops to ensure against transmission of water pump vi-
bration. The necessary components must be obtained
in the field.
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 high-
est point or points in the chilled water piping to allow
any trapped air to be purged. Vent and drain connec-
tions 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 tak-
en from the piping system return line and not the
cooler. This piping scheme is recommended, but is
not mandatory.
2. The inlet and outlet cooler connection sizes are pro-
vided in Table 6 on page 47 (Physical Data).
3. A 1/16 in. mesh strainer is provided at 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.
5. As an aid to servicing, thermometers and pressure
gauges should be installed in the inlet and outlet wa-
ter lines.
6. The chilled water lines that are exposed to outdoor
ambients should be wrapped with supplemental
heater cable and insulated to protect against freeze-
up during low ambient periods, and to prevent for-
mation of condensation on lines in warm humid
locations. As an alternative, ethylene glycol should
be added to protect against freeze-up during low
ambient periods.
7. A chilled water flow switch, (either by Quantech or
others) MUST be installed in the leaving water pip-
ing of the cooler. If the factory wired flow switch
and extension pipe kit is not selected, the field in -
stalled flow switch must be installed so that there
is 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 (refer to manufacturer’s instructions fur-
nished with the switch). The switch is to be wired
to Terminals 13 and 14 of XTBC1 located in the
control panel, as shown on the unit wiring diagram.
The Flow Switch MUST NOT be used
to start and stop the chiller (i.e. starting
and stopping the chilled water pump). It
is intended only as a safety switch.