Phau Ntawv Qhia

En-7
CAUTION
• Be careful not to generate a spark as follows for using a flammable refrigerant.
- Do not remove the fuse while the power is on.
- Do not disconnect the wiring while the power is on.
- It is recommended to position the outlet connection in a high position. Place the
cords so that they do not get tangled.
• Ground (Earth) the unit. Do not connect the ground (earth) cable to a gas pipe, water
pipe, lightning rod, or a telephone ground (earth) cable. Improper grounding (earth-
ing) may cause electric shock.
• Install the remote controller cables so as not to be direct touched with your hand.
• Do not connect power supply cables to the transmission or remote controller termi-
nals, as this will damage the product.
• Never bundle the power supply cable and transmission cable, remote controller
cable together. Separate these cable by 2 in (50 mm) or more. Bundling these cables
together will cause miss operation or breakdown.
• When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:
- Establish a ground (an earth) for the indoor and outdoor units and peripheral
devices.
- Cut power (breaker) off.
- Touch metal part of the indoor and outdoor units for more than 10 seconds to
discharge static electricity charged in the body.
- Do not touch terminals of parts and patterns implemented on PCB.
• Be sure to refer to the below diagram for do correct field wiring. Wrong wiring causes
malfunction of the unit.
• Check local electrical rules and also any specific wiring instructions or limitation.
3.6.1. Wiring system diagram
Y1
Y2
1
2
■
Standard pair
Indoor unit
Indoor unit
*Ground (Earth) the remote controller if it has an ground (earth) line.
Ground (Earth) line
Outdoor unit
Power line
Control line
Connection cable
Wired remote controller cable
■
Flexible multi-split type
Indoor unit Outdoor unit
Indoor unit
Ground (Earth) line
Control line
Connection cable
Wired remote controller cable
Power line
Indoor unit
*Ground (Earth) the remote controller if it has a ground (earth) line.
UNIT A
UNIT B
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the indoor unit, and then turn the flare nut by hand.
Connection pipe
(Gas)
Connection pipe
(Liquid)
Indoor unit
(3) When the flare nut is tightened properly by your hand, hold the body side coupling with
a wrench, then tighten with a torque wrench. (Refer to the following table for the flare
nut tightening torques.)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in (mm)] Tightening torque [ft·lb (N·m)]
1/4 (6.35) dia. 12 to 13 (16 to 18)
3/8 (9.52) dia. 24 to 31 (32 to 42)
1/2 (12.70) dia. 36 to 45 (49 to 61)
5/8 (15.88) dia. 46 to 55 (63 to 75)
3/4 (19.05) dia. 66 to 81 (90 to 110)
Do not remove the cap from the connection pipe before connecting the pipe.
3.6. Electrical wiring
WARNING
• Electrical work must be performed in accordance with this Manual by a person certified
under the national or regional regulations. Be sure to use a dedicated circuit for the
unit. An insufficient power supply circuit or improperly performed electrical work can
cause serious accidents such as electric shock or fire.
• Before starting work, check that power is not being supplied to the indoor unit and
outdoor unit.
• For wiring, use the prescribed type of cables, connect them securely, making sure
that there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as over-
heating the terminals, electric shock, or fire.
• Securely install the electrical box cover on the unit. An improperly installed electrical
box cover can cause serious accidents such as electric shock or fire through exposure
to dust or water.
• Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
• Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insufficient insulation, or exceeding the allowable
current can cause electric shock or fire.
• Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insufficient insulation, or exceeding the allowable current
can cause electric shock or fire.
• Match the terminal block numbers and connection cable colors with those of the
outdoor unit or branch box. Erroneous wiring may cause burning of the electric parts.
• Securely connect the connection cables to the terminal board. In addition, secure the
cables with wiring holders. Improper connections, either in the wiring or at the ends
of the wiring, can cause a malfunction, electric shock, or fire.
• Always fasten the outside covering of the connection cable. (If the insulator is chafed,
electric leakage may occur.)
• Install an earth leakage breaker. In addition, install the earth leakage breaker so
that the entire AC main power supply is cut off at the same time. Otherwise, electric
shock or fire could result.
• Always connect the ground (earth) cable. Improper grounding (earthing) work can
cause electric shocks.
• Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
• Connect the connection cable firmly to the terminal board. Imperfect installation may
cause a fire.
• Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside
the unit.
• Install the remote controller cables so as not to be touched directly with your hand.
• Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
• Unit shall be grounded (earthed) in compliance with the applicable local and national
codes.