Service Support Function; Check Function For Connecting Of Refrigerant And Control Lines - Toshiba MMY-MUP0721FT6P-UL Service Manual

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
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.
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.
Check No. of indoor units/No. of units with cooling thermostat
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 [B]. After pushing SW04 on the interface P.C.board
No. of unit with heating thermostat ON is displayed on 7-
segment display [B] Check that this display surely matches
with the expected No. of indoor units.
Check No. of indoor units/No. of units with heating
thermostat 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.
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]
A
Be sure to turn on the power at indoor
side before power-ON of outdoor unit.
(7-segment display)
[A] [B]
[ [ .] [
System capacity
(7-segment display)
[A]
[ .] [
No. of
connected
outdoor units
(7-segment display)
[A] [B]
[
[
.]
No. of indoor
No. of
unit connected
connected
to the system
outdoor
units
[C
No. of units
with cooling
thermostat ON
(7-segment display)
[A]
[
[H
.]
No. of No. of units
connected with heating
outdoor
thermostat ON
units
(7-segment display)
[A]
Cooling [ J .C ] [ [
Heating [ J .H ] [ [
- 170 -
t]
[B]
P]
]
Push SW04
]
[B]
]
89.6(32)
SW02 to
[B]
(Heating)
]
54.4(18)
]
14(-10)
Outdoor temperature [°F(°C)]
SW02 to
[2] [1]
(Cooling)
50(10) 109.4(43)