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Caution:
Install wiring so that it is not tight and under tension. Wiring under tension
may break, or overheat and burn.
•
Fix power source wiring to control box by using buffer bushing for tensile force.
(PG connection or the like.) Connect transmission wiring to transmission ter-
minal block through the knockout hole of control box using ordinary bushing.
•
After wiring is complete, make sure again that there is no slack on the connec-
tions, and attach the cover onto the control box in the reverse order removal.
7.3. Connecting electrical connections
(Be sure to prevent terminal screws from loosening.)
Caution:
•
Fix the site wiring firmly in place with wiring clamps.
•
Ensure that wiring installation work does not result in tension being ap-
plied to the wiring. Such tension may result in breaks in wiring, and con-
sequent overheating, smoke, or flame.
Step 1. Turn the key in the center of the panel at the bottom of the unit to
open the panel. Next, remove the four screws in the control box cover
to remove the cover.
Step 2. Install electrical wiring, internal and external connecting wiring, and
earth wiring, as shown in Fig. 7.3.1. Refer to "7.5. External I/O Speci-
fications" if installing wiring when external I/O terminals are used.
Step 3. When wiring is complete, check for less connections and wiring mis-
takes, and close the panel.
[Fig. 7.3.1] (P.3) MA Remote controller
<A> Model 250
<B> Model 500
A
Transformer
C
Transmission line terminal block
E
Connect transmission line to outdoor unit
F
To power supply
H
Fuse
J
Bottom panel
7.4. Setting addresses
(Be sure to operate with the main power turned OFF.)
•
There are two types of rotary switch setting available: setting addresses 1 to 9
and over 10.
<How to set addresses>
Example: If Address is "3", remain SW12 (for over 10) at "0", and match
SW11(for 1 to 9) with "3".
Caution:
Setting the address of the indoor unit controller
•
For the Model 500
The top side indoor controller address of the indoor unit must always be
odd number. The bottom side indoor controller address must be 1 more
than the top side indoor controller address.
•
Setting the address of the outdoor unit controller
The address must be 50 more than the address of the indoor units using
the same refrigerant.
* If the address is not correctly set, operation will not run correctly.
After setting the address, enter the set address on the product nameplate on the
front panel using a permanent marker.
•
The rotary switches are all set to "0" when shipped from the factory. These
switches can be used to set unit addresses.
•
The determination of indoor unit addresses varies with the system at site. Set
them referring to technical data.
•
If connecting a controller inside a central controller, the address of the two
controllers inside the Model 500 indoor unit must always be set in the same
group.
[Fig. 7.4.1] (P.4)
• When there is a single Model 250 unit
A
CN41 as it is
*1 The numbers shown in the square (
*2 The Model 250 indoor unit contains one indoor controller board.
[Fig. 7.4.2] (P.4)
• When there is a single Model 500 unit
A
Replace CN41 with CN40
B
CN41 as it is
* The Model 500 indoor unit contains two indoor controller boards.
[Fig. 7.4.3] (P.4)
• When connected to G-50
A
CN41 as it is
C
Group 2
E
DC Power supply (DC 12V)
10
B External I/O board
D Fix in place after connecting wiring.
G Earth
I Control box
) are addresses.
B Group 1
D Power supply unit
7.5. External I/O Specifications
I/O Specifications
Input
Function
Application
Run/stop
Allows issue of
Pulse
ON/OFF
(Voltage/no-voltage "a" contact)*
command to
<Voltage>
indoor unit.
Power supply: DC12 - 24 V
Current: Approximately 10 mA (DC12 V)
<Pulse standard>
* Use micro-current contacts (DC12 V 1 mA).
Caution:
1. Wiring should be covered by insulation tube with supplementary insula-
tion.
2. Use relays or switches with IEC or equivalent standard.
3. The electric strength between accessible parts and control circuit should
have 2750 V or more.
Output
Function
Application
External output of operation
Operation
status signal for each coolant
status
circuit of indoor unit.
External output of fault signal
Fault
for each coolant circuit of
indoor unit.
[Fig. 7.5.1] (P.5)
<A> Model 250
<B> Model 500
A Voltage input (with polarity)
C Start/Stop
E Common
G Relay contact output
I Operation status
K External I/O board
M Connector connection
A Voltage input (with polarity)
Pulse input of start or stop
External
DC12 - 24 V
power supply
Input current (per contact)
Approximately 10 mA (DC12 V)
Remote Start/Stop switch
SW12
* Toggles ON/OFF each time switch is pressed (pulse input).
D No-voltage input
Remote Start/Stop switch
SW11
* Toggles ON/OFF each time switch is pressed (pulse input).
Micro-current contacts (DC12 V 1 mA)
G Relay contact output
Display
DC30 V 1 A
power supply
AC100 V/200 V 1 A
L1, L3
Operation status
L2, L4
Fault status
XA ~ XE
Relay (allowable current 10 mA - 1 A)
•
Settings for indoor unit
Check that the following settings have been entered when using external input.
1) Control board DIP SW3 - 8 ON
(Set to ON prior to shipment from factory. External input disabled when set to
OFF.)
2) Address board DIP SW1 - 10 OFF
(Set to OFF prior to shipment from factory. External input disabled when set to
ON.)
3) Normal/Check switch inside unit control box set to Normal.
(Set to Normal prior to shipment from factory. External input disabled when set
to Check.)
Signal specifications
200 ms or more
Signal specifications
Relay "a" contact output
DC30 V or AC100 V/200 V
Contact rated current: 1 A
Contact minimum load: 10 mA
B External power supply
D No-voltage input
F Start/Stop
H Display power supply
J Fault
L Terminal block connection
N Wiring distance 100 m or less.
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