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7.4. Connecting distant signal line
Pull the wires for operation command, for operation signal and for error signal
through the bunch of wires (Distant signal) at the bottom of the controller.
Connect each wire to operation command (level maneuvering): A1 and A2, to op-
eration signal: TB1 and to error signal: TB2.
Item
Connection circuit (on-site circuit)
Operation
A1
command
A2
Maximum 10 m
A1
A2
Maximum 10 m
Relay power
source
SW2
Operation signal
TB1
Error signal
TB2
8. Setting switches
8.1. Setting unit size
Set the unit size according to the evaporator type (field supply).
Set the dip switch (SW2) on the control board in accordance with the chart below.
Type
Unit size
(Air handling unit)
P8
PAC-AH10A-G
P10
*
indicates ON/OFF state.
[Fig. 8.1.1] (P. 4)
9. Initial setting and test run
After the installation work, which was performed in accordance with the outdoor
unit installation manual, and after the AHU refrigerant piping work, drain piping
work, electrical wiring work, AHU controller wiring work, and switch setting, turn on
the main power at least 12 hours before starting operation in accordance with the
outdoor unit installation manual.
•
Test run
1 Start the fan of AHU.
2 Close the contact A1/A2 (close: ON, open: OFF)
3 Check that cool air blows.
4 Open the contact A1/A2.
5 Stop the fan of AHU.
When the remote controller is used, remove the switch connector inside the con-
troller.
[Fig. 9.0.1] (P. 4)
SW1
SW1: Minimum applica-
ble load
DC12 V, 1 mA
X
X: Minimum applicable
load
DC12 V, 1 mA
X
L1: Operation display lamp
Display power source:
L1
DC30 V, 1 A
AC100 V/200 V, 1 A
L2: Error display lamp
Display power source:
L2
DC30 V, 1 A
AC100 V/200 V, 1 A
Allowed evaporator
Setting switches
capacity
(SW2)*
1 2 3 4 5
15.5 ~ 25.0 kW
ON
OFF
1 2 3 4 5
19.5 ~ 30.0 kW
ON
OFF
Notes:
•
Lead the wire for operation signal and error signal through the ferrite
core inside the controller, and wrap the wire once around the core as
shown in the figure, and connect the wire.
[Fig. 7.4.1] (P. 4)
•
After connecting each wire to the terminal, tighten each nut tightly through
which the wire runs.
•
Check that the bunch of wires do not come off even if they are pulled
strongly.
Caution:
•
After the wiring work is completed, mount the inner cover first and then
the outer cover.
•
Tighten the screws tightly. (If not, drop of water may enter, leading to
malfunction.)
•
Operation signal cables and Error signal cables and Operation command
cables must be routed in a distance of at least 20 cm from all other ca-
bles.
•
When Operation signal, Error signal and Distant signal are taken out,
remove the plug inside the bunch of wires.
•
Wind the supplied tube around the wire according to the size and number
of the wire.
•
If the wire comes off the tightly tightened bunch of wires, wind the insu-
lation tape around the wire to make the wire thicker.
[Fig. 7.4.2] (P. 4)
A Bunch of wires
B Plug
C Tube
D Insulation tape
8.2. Cooling only
The dip switch (SW5-3) on the control board of the outdoor unit must be set to ON,
and must be used only in the cooling mode.
Caution:
Using the switch in the heating mode may cause malfunction.
Notes:
After 16-minute or more cooling operation, and when 1
mistor detection temperature for liquid pipe is detected for 3 minutes in a
row, the compressor valve will be stopped to prevent freezing. The operation
will be normal when either of the following conditions is met.
•
When 3 minutes have passed after 10
tion temperature for liquid pipe is detected.
•
When 6 minutes have passed after the compressor was stopped to pre-
vent freezing.
°
C or less of the ther-
°
C or more of the thermistor detec-
9
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