Electrical Connection - York YVAG012 Operation & Maintenance Manual

ELECTRICAL CONNECTION

The units are shipped with all factory-mounted controls
wired for operation.
Field Wiring – Power wiring must be provided
through a non-fused disconnect switch to the unit
terminals in accordance with CE or local code
requirements. Minimum
maximum dual element fuse size are given in Electrical
Data.
Only copper power wiring should be used for supplying
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 characteristics that
may cause loose terminations resulting from the
contraction and expansion of the wiring. Aluminum
oxide may also build up at the termination causing hot
spots and eventual failure.
See unit wiring diagrams for field and power wiring
connections, communication wiring connections,
modular wiring, alarm contactors, remote switch input,
remote cooling/ heating switch, etc.
Alarm Status Contacts
Normally-open contacts are available for each unit.
These normally-open contacts remain open when the
system is functioning normally. The respective contacts
will close when the unit is shut down on a unit fault, or
locked out on a system fault. For modular applications,
the master unit will not only output internal fault, but
also the fault of subordinate units. Field connections are
at terminals 6 to 8.
Remote Switch Contacts
To remotely start and stop the unit, dry contacts can be
wired to terminals 2 to 4. Refer to unit wiring diagram.
The function will be available after being activated
through HMI.
Remote C/ H Switch
The contacts are used to switch unit operating mode
remotely. Dry contacts can be wired to terminals 1 to 5.
Refer to unit wiring diagram.
The function will be available after being activated
through HMI.
JOHNSON CONTROLS
Cooke Industries - Phone: +64 9 579 2185
circuit ampacity and
Email: sales@cookeindustries.co.nz
FORM NO.: 6U5M-A11M-NB-EN
External Interlock
The unit will be allowed to run only if the interlock is
connected. It is used to link external facilities like fire
alarms in case there's an emergency cutoff. It is wired
to terminals 3 to 4.
External interlock is short-circuited before delivery.
Compressor Heater
Compressor heaters are standard. All compressors
utilize one heaters with 20 W each.
Compressor heater will be switched on in standby
mode when ambient temperature is below 12 °C. This
will assure that liquid slugging and oil dilution does not
damage the compressors.
Pressure Cutout
One high pressure cutout is installed in the discharge
piping of each system. The HP cutout opens at 4.03
MPa (585 PSIG) and closes at 3.1 MPa (450 PSIG).
Safety Precautions
Please comply strictly with the following important
items related with safety in "safety precautions"
1. The units YVAG012~040RSE can be connected
only to a power supply with system impedance no more
than 0.184 ohm. If necessary, please consult your
supply authority for system impedance information.
2. Wire should conform to national standards, its
diameter should not be lower than recommended wire
diameter and its weight shall not be lighter than
chloroprene rubber armored cable (No. 57 wire in
IEC60245).
3. Only professionals from manufacturers, its service
departments or other similar institutions can renew the
broken flexible power wires for safety reasons.
4. Never share the power supply with other electric
appliances in case of overload. Earth leakage circuit
breaker matching with working voltage of unit should
be used.
5. Only designated accessories by YORK can be
used, and services of installation and technology
support can be obtained from manufacturers or
authorized resellers. Fail to correct installation for
control accessories may cause malfunction of the
controller or electric shock etc. Users are not allowed
Web: www.cookeindustries.co.nz
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