MULTI TYPE

7-7. Service Support Function
7-7-1. Check Function for Connecting of Refrigerant and Control
Lines
This function is provided to check misconnection of the refrigerant pipes and the control transmission line (Wiring
over lines) between indoor unit and outdoor unit by using the switch on the interface P.C. board of the header unit.
However, be sure to check the following items prior to executing this check function.
1 This check function does not work when a group operation by remote controller is performed and
it is used over outdoor units.
2 When using this check system, be sure to check for each 1 line in the unit of outdoor unit. If
checking the multiple lines at the same time, misjudgment may be caused.
(Check procedure)
Power ON
Be sure to turn on the power at indoor
side before power-ON of outdoor unit.
System capacity check
Set the rotary switches SW01/SW02/SW03 on the interface
P.C. board of the header unit to [1/2/3]. Then the system
capacity is displayed on 7-segment display [A]. Check that
this display surely matches with the expected system
capacity.
(7-segment display)
[A] [B]
[ .] [ HP]
System horsepower
Check No. of outdoor units
Set the rotary switches SW01/SW02/SW03 on the interface
P.C. board of the header unit to [1/3/3]. Then No. of outdoor
units connected to the system is displayed on 7-segment
display [A]. Check that this display surely matches with the
expected No. of outdoor units.
(7-segment display)
[A] [B]
[ .] [ P]
No. of
connected
outdoor units
Check No. of indoor units/No. of units with cooling thermo
ON
Set the rotary switches SW01/SW02/SW03 on the interface
P.C. board of the header unit to [1/4/3]. Then No. of indoor
units connected to the system is displayed on 7-segment
display [A]. Check that this display surely matches with the
expected No. of indoor units.
(7-segment display)
[A] [B]
[ .] [C ]
No. of
connected
outdoor
units
No. of units
with cooling
thermo ON
Check No. of indoor units/No. of units with heating thermo
ON
Set the rotary switches SW01/SW02/SW03 on the interface
P.C. board of the header unit to [1/5/3]. Then No. of indoor
units connected to the system is displayed on 7-segment
display [A]. Check that this display surely matches with the
expected No. of indoor units.
(7-segment display)
[A] [B]
[ .] [H ]
No. of
connected
outdoor
units
No. of units
with heating
thermo ON
Check incorrect wiring
According to the indoor temperature, select one of the
following items for setup of the rotary switches on the
interface P.C. board of the header unit.
Cooling: SW01/SW02/SW03 to [2/1/1]
Heating: SW01/SW02/SW03 to [2/2/1]
(7-segment display)
[A] [B]
Cooling [ J .C ] [ ]
Heating [ J .H ] [ ]
Indoor temperature [°C]
32
18
-10
SW02 to
[2]
(Heating)
SW02 to
[1]
(Cooling)
10 43
Outdoor temperature [°C]
A
148