QUANTECH
57
SECTION 3 - HANDLING, STORAGE, INSTALLATION, AND REASSEMBLY
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
3
UNIT PIPING
Compressor lubricant piping and system refrigerant
piping are factory installed on all units shipped assem-
bled. On units shipped dismantled, the lubricant piping
and system oil return should be completed under the
supervision of a Quantech representative, using fur-
nished material.
ELECTRICAL CONNECTION
The following connection recommendations are in-
tended to make sure the unit is operated safely. Failure
to follow these recommendations could cause harm
to persons or damage the unit, and may invalidate the
warranty.
Do not mount additional controls (re-
lays, etc.) in the control panel. Power
and control wiring not connected to the
control panel should not be run through
the control panel. If these precautions
are not followed, it could lead to a risk of
electrocution. In addition, electrical noise
could cause malfunctions or damage the
unit and its controls.
After wiring the power connection, do
not switch on main power to the unit.
Some internal components are live when
the main power
is switched on, which
must only be done by authorized persons
familiar with starting, operating, and
troubleshooting this type of equipment.
POWER WIRING
All electrical wiring should be carried out in accor-
dance with local regulations. Route properly sized
cables to cable entries on the unit.
In accordance with local codes, NEC codes, UL and
CE standards, it is the user's responsibility to install
over current protection devices between the supply
conductors and the power supply terminals on the unit.
To ensure that no eddy currents are set up in the power
panel, the cables forming the 3-phase power supply
must enter via the same cable entry.
All sources of supply to the unit must be
taken via a common point of isolation (not
supplied by Quantech).
Use copper power wiring only for supplying power to
the chiller. This is to avoid safety and reliability issues
resulting from connection failure at the power connec-
tions to the chiller. Aluminum has thermal characteris-
tics that may cause loose terminations resulting from
the contraction and expansion of the wiring. Alumi-
num oxide may also build up at the termination, which
may cause hot spots and eventual failure. If aluminum
wiring is used to supply power to the chiller, install
Al-Cu compression fittings to transition from alumi-
num to copper. Install the transition in an external box
separate to the power panel. Run the copper conductors
from the box to the chiller.
Caulk power and control wiring conduit
entering the power panel to ensure that
moist air from the building cannot enter
the panel.
POWER SUPPLY WIRING
Units require one three-phase supply, plus earth. Con-
nect:
• The three-phase supplies to the circuit breaker lo-
cated in the panel.
• A suitably sized earth wire to the PE terminal in
the panel.
115 VAC CONTROL SUPPLY
TRANSFORMER
A 2-wire high voltage to 115 VAC supply transformer
is standard in the chiller. This transformer is mounted
in the cabinet and steps down the high voltage supply
to 115 VAC to be used by the controls, VSD, feed and
drain valve controller, valves, solenoids, heaters, etc.
The high voltage for transformer primary is taken from
the chiller input. Fusing is provided for transformer.
Removing high voltage power to the
chiller will remove the 115 VAC supply
voltage to the control panel circuitry.
CONTROL WIRING
All control wiring utilizing contact closures to the con-
trol panel terminal block is nominal 115 VAC and must
be run in shielded cable, with the shield grounded at
Summary of Contents for QWC4
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