York BOC-07, Installation Manual

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12
HIGH WALL
■
Vertical Discharge Condensing Unit
(H*DA, H*DB, H*RA)
The indoor unit and interconnecting wiring voltage is
220 volts. Where the outdoor unit requires a different
operating voltage such as 24 volts one of the following
solutions can be applied.
1. The coil of the relay switching the compressor and
reversing valves should be changed to a 220V coil.
2. A transformer should be installed to supply 24 volts
and a relay installed with a 220 volt coil to switch the
24 volts required by the outdoor units. The transformer
should be energised at all times and not switched by
the start signal from the indoor unit. Switching the
transformer directly will cause electronic noise which
may cause malfunction of the electronics.
■
Wiring
L N 1 2
For further detail on wiring of these units, see the diagrams pasted
inside each unit.
Cautions
• Never modify the unit by removing any of the safety
guards or by bypassing any of the safety interlock
swithces.
• Connect the connecting cable correctly and connect
the connecting cable to terminal as identified with their
respective marks.
• Do not scratch the conductive core & inner insulator of
power supply cables and do not deform or smash on
the surface of cables.
■
Electrical Connections
All electrical wiring and connections must comply with
local codes and standards. Power supply cord and
interconnection cord used must not be lighter than
Polychloroprene sheated cord (245 IEC 57 or H05RN-F).
Disconnecting device must have a contact separation
of at least 3 mm.
MHC 07-25 -Cooling Only
2
1
3
1
N L 2
N
4
3 4
MHC 07-25 -Heat Pump
2
1
3
1
N L 2
N
4
3 4
For correct installation, a proper ground connection must be
made for unit.
Wiring sizes
Or as required to meet national and local codes.
Notes
• Terminals N and 1 (see diagrams above) correspond
to power supply to the indoor unit coming from the
outdoor unit.
• Compressor power supply is established by teminal 2.
• Power supply to the 4-way valve is established by
terminal 3.
• For further details on wiring of these units, see the
diagrams pasted inside each unit.
Indoor
Unit
Outdoor
Unit
Indoor
Unit
Outdoor
Unit
Power 220-240V/1Ph/50Hz
Supply 208-230V/1Ph/60Hz
Unit size 7 9 12 18 25
Power supply mm
2
3x2.5 3x4
Interconnection Cooling mm
2
3x2.5 + Ground
(Indoor/Outdoor) Heating mm
2
4x2.5 + Ground
Fuse (slow-Blow) A 10 16 20
Indoor
Unit
Cooling Only Units
24 V FROM OUTDOOR UNIT
Power Supply
Power 220-240V/1Ph/50Hz
Supply 208-230V/1Ph/60Hz
03_MHC/BOH 07-25.p65 18/3/02, 16:31 12