112
8-7. Service Support Function
8-7-1. 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 execute 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 switch SW01, SW02, and SW03 on the interface
P.C. board of the header unit to [1], [2] and [3] respectively.
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)
[B]
[ HP]
(7-segment display)
[A]
[ ]
No. of connected
outdoor units
[B]
[C ]
(7-segment display)
[A]
[ ]
No. of
connected
indoor units
[B]
[ P]
(7-segment display)
[A]
Cooling [ JC ]
Heating [ JH ]
[B]
[ ]
[ ]
Check No. of outdoor units
Set the rotary switch SW01, SW02, and SW03 on the interface
P.C. board of the header unit to [1], [3] and [3] respectively.
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.
Check No. of indoor units
Set the rotary switch SW01, SW02, and SW03 on the interface
P.C. board of the header unit to [1], [4] and [3] respectively.
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.
Operation mode setup
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=[2], SW02=[1], SW03=[1]
Heating: SW01=[2], SW02=[2], SW03=[1]
Indoor temper
ature [˚C]
SW02 to
[2]
(Heating)
32
18
–10
10
43
SW02 to
[1]
(Cooling)
Outdoor temperature
[˚C]
A
[A]
[ ]
System Horse power
Summary of Contents for MMC-AP0151H
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