ClimaCool UCH 30, Installation, Operation & Maintenance Manual

Page: 15 / 72

13
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The power for all modules is taken from a suitable circuit
breaker/fused disconnect power supply within the main
panel . The electrical service enters the individual modules
through the top into the module’s control panel enclosure .
Proper grounding of the module is mandatory . Before
carrying out any electrical work, confirm that the main
supply is isolated . A typical power wiring is located on page
47 – Power Distribution Drawing . Knockout drawings are
provided . Do not drill into cabinet; shavings can damage
electronic components . The power for all individual modules
shall be in compliance with all local and national codes .
CoolLogic Control System Wiring
A separate 115 volt power supply is required to power the
CoolLogic Master Control Panel . Communication between
the Master Control Panel and chiller modules requires a
simple two-conductor 18 AWG shielded cable rated at 60°C
minimum, daisy chain connection . Control wiring cannot be
installed in the same conduit as line voltage wiring or with
wires that switch highly inductive loads such as contactor
and relay coils. Refer to the Power Distribution Drawing on
page 47 of this manual for more information . All wiring shall
be in compliance with all local and national codes .
Electrical Phase Sequencing
Proper clockwise rotation for scroll compressor motors
is important to prevent damage to the compressors .
ClimaCool recommends the use of a phase sequence
indicating instrument following the manufactures
directions . An alternative is to “bump test” the compressors
one at a time with pressure gauges attached to the high and
low gauge ports of the compressors to check for proper
rotation . Energize the compressor for a few seconds to
ensure the discharge pressure gauge increases significantly.
If the discharge pressure does not increase, proper
rotation is reversed . Compressor rotation can be reversed
by opening the main electrical disconnect and switching
any two of the main power supply leads feeding that
compressor’s contactor .
Proper Voltage Balance
Occasionally, in three phase circuits, a voltage imbalance
occurs between phases . It is not recommended to operate
equipment when an imbalance greater that 2% occurs . This
causes motors to run at high temperatures and may affect
their longevity . The following example describes how to
calculate the average voltage of the three phases to see if
the imbalance is greater than 2% .
Example: Line 1 = 226v Line 2 = 230v Line 3 = 228v
The average is: (226+230+228) / 3 = 228v
Next, [100(228-226)] / 228 = 0.9%
The voltage imbalance of the three phase circuit is 0 .9% .
This is well under the 2% range .
Voltage/Phase Monitor
Voltage/phase monitors are factory supplied for field
installation with the CoolLogic Master Control Panel .
The voltage/phase monitor helps guard the chiller bank
against voltage fluctuations, phase failure or phase reversal
conditions which could void your warranty . The voltage/
phase monitor has three wires that connect to the main
three phase power chiller bank input . Two low voltage
control wires are connected to the CoolLogic Master Control
Panel . Do not install control wiring in the same conduit
as line voltage wiring or with wires that switch highly
inductive loads such as contactor and relay coils . Note: It
is mandatory to install one (1) monitor per bank at main
power distribution panel to monitor voltage and phasing of
power to the modules. See Wiring Diagram on page 13.
Electrical Connection
CAUTION/ATTENTION
Use only copper conductors
for field installed wiring. Unit
terminals are not designed to
accept other types of
conductors.
Utilisez uniquement des
conducteurs en cuivre pour le
câblage. Bornes de l’unité ne
sont pas conçus pour
accepter d’autres types de
conducteurs.
If this unit uses a 3 Phase Scroll
Compressor, the following
instructions MUST BE followed:
•
Unit power supply MUST BE
wired in the proper sequence to
avoid damage to the 3 Phase
Scroll Compressor;
• Scroll Compressors with
INCORRECT rotation show the
following characteristics:
- High sound level;
- High suction pressure and
low discharge pressure;
- Low current draw.
•
If any of the three above
characteristics exist, swap two of
the three supply wires at the
disconnect and recheck
compressor for incorrect rotation.
Si cet appareil utilise
compresseur scroll 3-Phase, les
instructions suivantes doivent être
suivies:
•
L’alimentation de l’appareil doit
être monté dans l’ordre correct
pour éviter endommager le
compresseur scroll 3-Phase
• Compresseurs scroll avec
rotation incorrecte montrent les
caractéristiques suivantes:
- Haut niveau de son;
- Pression d’aspiration élevée
et une faible pression de
décharge;
- Faible ampérage
•
Si l’un des trois éléments
mentionnés ci-dessus sont
remplies , échanger deux des
trois lignes électriques alimen
tant la interrupteur de sécurité et
vérifier la rotation du
compresseur.
3 PHASE SCROLL
COMPRESSOR UNITS
UNITÉ DE COMPRESSEUR
SCROLL 3-PHASE
CAUTION/ATTENTION
Disconnect power supply
(ies) before servicing. Refer
servicing to qualified service
personnel. Electric shock
hazard. May result in injury
or death!
Unit to be serviced by
qualified personnel only.
Refrigerant system under
pressure. Relieve pressure
before using torch. Recover
refrigerant and store or
dispose of properly.
Debrancher avant d’entre-
prendre le dépannage de
l’appareil. Consulter un
réparateur qualifie pour le
dépannage. Risque de choc
électrique. Résiltat de mai
dans dommages ou la mort!
Conifer la maintenance à
un technicien qualifie. Le
systéme frigorifique sous
pression. Décomprimer avant
d’exposer à la flamme.
Récuperer le frigorigene et
le stocker ou le détrulre
correctement.
WARNING/AVERTISSEMENT
CAUTION/ATTENTION