Service Support Function; Check Function For Connecting Of Refrigerant And Control Lines - Toshiba MCY-MHP0305HT-C Service Manual

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 outdoor 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
System capacity check
Set the rotary switches SW01 / SW02 / SW03 on the interface P.C.
board of the outdoor 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.
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 outdoor 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.
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 outdoor 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.
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 outdoor unit.
Cooling: SW01 / SW02 / SW03 to [2/1/1]
Heating: SW01 / SW02 / SW03 to [2/2/1]
Be sure to turn on the power at indoor
side before power-ON of outdoor unit.
(7-segment display)
System horsepower
(7-segment display)
No. of units
No. of
with cooling
connected
thermo ON
outdoor
units
(7-segment display)
No. of units
No. of
with heating
connected
thermo ON
outdoor
units
(7-segment display)
Cooling
Heating
69
92
SW02 to
SW02 to
[2] [1]
(Cooling)
(Heating)
46
Outdoor temperature [°C]