Section 3 -Electrical Continuity; 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 GB 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.
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
JOHNSON CONTROLS
Cooke Industries - Phone: +64 9 579 2185
SECTION 3 –ELECTRICAL CONTINUITY
circuit ampacity and
Email: sales@cookeindustries.co.nz
FORM NO.: 6U5M-A11M-NB-EN
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
to make any repair which may cause damage or electric
shock. For any maintenance demand, please contact the
manufacturer.
6. Never connect ground wire of unit power supply
with that of a gas fuel pipe, water pipe, lightning
arrester or telephone. Improper ground connection may
cause electric shock etc. Make sure connection between
ground wire and the ground terminal/the grounding
electrode is normal with regular inspection.
7. Field wiring should avoid edges of sheet metal,
sharp point of bolt, high-temperature tube pipe and
compressor shell in case of wire damage.
8. Wire fasteners should be used in case of wires
dropping out and wire damage caused by friction with
other parts.
9. Never touch with control elements and terminal
parts other than control panel in case of personal injury
as there's electricity in control cabinet before power
supply is cutoff.
10. Never operate the wire controller with sharp
materials for fear of scratching the wire controller
screen. Never contort or pull out electric wires in the
control cabinet to prevent loose wiring and control
failure. Benzene, diluents or chemical reagent is not
allowed to clean the controller and control elements to
avoid corrosion or malfunction. Use cloth with neutral
decontaminant solution for cleaning during which the
cloth should not be too wet; then clean again with dry
cloth. Never excessively press on the screen in case of
allochromasia.
11. Electric wires and electronic wires should be
separated during unit wiring for normal communication
and operation.
Web: www.cookeindustries.co.nz
26