Quantech QCC2015CEE, Installation, Operation And Maintenance Manual, Page: 30 / 172

QUANTECH
30
Form QCC2-NM1
Issue Date: 5/20/2021
SECTION 4 – INSTALLATION
Corrosive environments
Protection against corrosive environments is available
by supplying the units with either copper fin, cured
phenolic, or epoxy coating on the condenser coils. The
phenolic or epoxy coils should be offered with any
units being installed at the seashore or where salt spray
may hit the unit.
Spring isolators (optional)
When ordered, four (4) isolators will be furnished.
Identify the isolator, locate at the correct mounting
point, and adjust per instructions.
Compressor mounting
The compressors are mounted on four (4) rubber iso-
lators. The mounting bolts should not be loosened or
adjusted at installation of the chiller.
Pipework arrangement
The following are suggested pipework arrangements
for single unit installations.
Ductwork connection
Recommendations of the Building Services
Research Association.
General requirements
The following ductwork recommendations are intend-
ed to ensure satisfactory operation of the unit. Failure
to follow these recommendations could cause damage
to the unit, or loss of performance, and may invalidate
the warranty.
When ducting is to be fitted to the fan discharge it is
recommended that the duct should be the same cross-
sectional area as the fan outlet and straight for at least
three feet (1 meter) to obtain static regain from the fan.
Ductwork should be suspended with flexible hangers
to prevent noise and vibration being transmitted to the
structure. A flexible joint is also recommended be-
tween the duct attached to the fan and the next section
for the same reason. Flexible connectors should not be
allowed to concertina.
The unit(s) is not designed to take structural loading.
No significant amount of weight should be allowed to
rest on the fan outlet flange, deck assemblies or con-
denser coil module. No more than 3 feet (1 meter) of
light construction ductwork should be supported by the
unit. Where cross winds may occur, any ductwork must
be supported to prevent side loading on the unit.
If the ducts from two or more fans are to be combined
into a common duct, back-flow dampers should be fit-
ted in the individual fan ducts. This will prevent re-
circulation of air when only one of the fans is running.
Units are supplied with outlet guards for safety and to
prevent damage to the fan blades. If these guards are
removed to fit ductwork, adequate alternative precau-
tions must be taken to ensure persons cannot be harmed
or put at risk from rotating fan blades.
Wiring
Condensing Units are shipped with all factory-mount-
ed controls wired for operation.
Field wiring
Power wiring must be provided through a fused dis-
connect switch to the unit terminals (or optional mold-
ed disconnect switch) in accordance with N.E.C. or lo-
cal code requirements. Minimum circuit ampacity and
maximum dual element fuse size are given in Table 9.
Only copper power wiring should be used for supply-
ing power to the unit. This is recommended to avoid
safety and reliability issues resulting from connection
failure at the power connections to the unit. Aluminum
wiring is not recommended due to thermal character-
istics that may cause loose terminations resulting from
the contraction and expansion of the wiring. Alumi-
num oxide may also build up at the termination causing
hot spots and eventual failure. If aluminum wiring is
used to supply power to the unit, AL-CU compression
fittings should be used to transition from aluminum to
copper. This transition should be done in an external
box separate to the power panel. Copper conductors
can then be run from the box to the unit.
A 120-1-60, 15 A source must be supplied for the control
panel through a fused disconnect when a control panel
transformer (optional) is not provided. See Figure 8.
See unit wiring diagrams for field and
power wiring connections, alarm con-
tacts, compressor run status contacts,
PWM input, and load limit input. Refer
to section on UNIT OPERATION for a
detailed description of operation concern-
ing aforementioned contacts and inputs.