AirStage AB A036GTEH Series Installation Manual - Page 9

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Earth (Ground) the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shock.
Do not connect power supply cables to the transmission or remote controller terminals,
as this will damage the product.
Never bundle the power supply cable and transmission cable, remote controller cable
together.
Separate these cable by 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 an earth (ground) for the indoor and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the indoor unit for more than 10 seconds to discharge static elec-
tricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.

6.1. Electrical requirement

Voltage rating
Operating range
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Specifi cations for local wiring power cord and branch wiring are in compliance with local
code.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is long.
Breaker should be installed at every refrigerant system. Do not use a breaker in a diff erent
refrigerant system.
Refer to the table for the breaker specifi cations of each installation condition. Perform
the power crossover wiring within the range of the same refrigerant system. When the
crossover wiring is done, make a connection for indoor units to satisfy conditions A and B
below.
A. Current breaker requirements
Model
MCA
AB*A030GTEH
0.52 A
AB*A036GTEH
0.66 A
AB*A045GTEH
0.98 A
AB*A054GTEH
1.32 A
MCA: Minimum Circuit Ampacity
MFA: Main Fuse Ampacity
When the power crossover wiring is done, make it so that the total of the MCA of the
connected RB units and indoor units does not exceed the 15 A. For RB unit MCA, refer to
the RB unit installation manual.
If the capacity of connected RB units and indoor units exceeds the upper limit, either add
breakers or use a breaker with a greater capacity.
B. Earth leakage breaker requirements
Breaker capacity
30 mA, 0.1 sec or less
100 mA, 0.1 sec or less
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the 100 mA capacity breaker is not provided, split the quantity of the indoor units into
small groups of 44 units or less and provide a breaker with capacity of 30 mA for each
group.
6.1.1. Cable specifications
Follow the specifi cations below for the power supply, transmission and remote controller
cable.
Recommended
2
cable size (mm
Power
2.5
supply cable
Transmission cable
0.33
Remote controller
cable
0.33 to 1.25
(2-wire type)
*: Use shielded cable in accordance with local rules for remote controller cable.
CAUTION
230 V
198 to 264 V (50 Hz)
198 to 253 V (60 Hz)
MFA
20 A
* Maximum connectable "indoor units" or
"indoor units + RB units"
44 or less
45 to 148 **
Cable type
Remark
)
Type 60245 IEC57
2 Cable + earth (ground)
or equivalent
22 AWG
LEVEL 4 (NEMA)
LONWORKS
non-polar 2 core,
compatible cable
twisted pair solid core
diameter 0.65 mm
Non-polar 2 core,
Sheathed PVC cable*
twisted pair

6.2. Wiring method

Example
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
*2
Power supply
Breaker
*3
Power supply
Remote controller
(Master)
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: Earth (Ground) the remote controller if it has an earth (ground) cable.
*3: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Power supply
Pull box
Breaker
Power supply

6.3. Unit wiring

Before attaching the cable to terminal block.
6.3.1. Power supply cable
Adjust the length of power supply cable to avoid excessive tension with referring fi gure
below.
Earth (Ground) cable
A. For solid core wiring
(1) To connect the electrical terminal, follow the below diagram and connect after looping it
around the end of the cable.
(2) Use the specifi ed cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(3) Use an appropriate screwdriver to tighten the terminal screws. Do not use a
screwdriver that is too small, otherwise, the screw heads may be damaged and
prevent the screws from being properly tightened.
(4) Do not tighten the terminal screws too much, otherwise, the screws may break.
(5) See the table for the terminal screw tightening torques.
(6) Please do not fi x 2 power supply cables with 1 screw.
Strip 25 mm
Screw with
special washer
Cable
Cable end (Loop)
Terminal block
Indoor unit
Indoor unit
*2
*2
Breaker
Breaker
*3
Remote controller
Remote controller
(Slave)
Indoor unit
Indoor unit
Power supply
Pull box
20 mm
45 mm
Loop
Screw with
special washer
Cable end
(Loop)
Cable
*3
En-8