Electrical Wiring; General Check; Electrical Wiring Connection - Hitachi DXF-2.0A1 Operation Installation Maintenance Manual

5 Electrical Wiring
WARNING
● T urn OFF the main power switch of the
indoor unit and the outdoor unit before
electrical wiring work or a periodical check is
performed.
● C heck to ensure that the indoor fan and the
outdoor fan have stopped before electrical
wiring work or a periodical check is
performed.
● P rotect the wires, drain pipe, electrical parts,
etc. from rats or other small animals.
If not protected, rats may gnaw at unprotected
parts and at the worst, a fire will occur.
● T ighten screws according to the following
torque.
M3.5: 0.9 ft·lbs (1.2 N·m)
M5: 1.5 to 1.8 ft·lbs (2.0 to 2.5 N·m)
● Secure all the accessories around the wires
and seal the wiring connection hole with the
seal material to protect the product from any
condensation or insects.
● Tightly secure the wires with the cord clamp.
● Secure the cable of the wired controller using
the plastic band.
5.1 General Check
(1) Make sure that the field-selected electrical
components (main power switches, circuit
breakers, wires, conduit connectors and
wire terminals) have been properly selected
according to the electrical data given in
"Technical Catalog I". Make sure that the
components comply with National Electrical
Code (NEC).
(2) Make sure that the power supply voltage is
within ±10% of the rated voltage.
(3) Check the capacity of the electrical wires.
If the power source capacity is too low, the
system cannot be started due to the voltage
drop.
(4) Make sure that the ground wire is connected.
(5) Power Source Main Switch
Install a multi-pole main switch with a space
of 3.5mm or more between each phase.
20
5.2 Electrical Wiring Connection
• Connect the wires to the terminal block
according to the wiring diagram.
• Follow the local codes and regulations when
performing the electrical wiring.
• Use shielded wires for intermediate wiring to
protect the units from noise interference at
lengths of less than 300m and whose size is in
compliance with local codes.
• Run through the cables using conduit tube, and
completely seal the end of conduit tube with
sealing materials.
• Use an ELB (Electric Leakage Breaker). If not
used, it will cause an electric shock or a fire.
● Pay attention to the connection of the
operating line. Incorrect connection may
cause PCB failure.
● Use the attached waterproof cable gland to
secure the wires firmly.
● Cable gland diameter specification:
6.0mm(min) to 10.0mm(max). If needed,
install additional tube insulation or wind
with insulation tape around the wire to make
the wire thicker.
● After passing the wires through the cable
gland, close the nut firmly. Pull and release
the cable to make sure it remains attached .
● For unused cable gland, insert the proper
short cable into the cable gland and close
the opening firmly as shown in the following
figure to avoid water enter into the control
box.
● Fix the 4 screws for the cover of the control
box securely to avoid water enter into the
control box after installation.
● Do not break sealing material on the control
box during operation.
9 cable
Sealing material
9 cable
sealing
glands
glands
material
4 fixing screws
4 fixing screws
for the control
for the control
box cover
box cover
P5417151-rev.1