Setup For The Header Unit; In Case Of Trouble On Header Unit - Toshiba Super MMU-AP0091H Service Manual

[Setup for the header unit]

7. Error clear is set up from the header unit.
1) Check [U1] [E26] (Decrease of No. of connected outdoor units) is displayed on 7-segment display under condition
that the rotary switches SW01/02/03 are set to 1/1/1 on the interface P.C. board.
2) Set the rotary switches SW01/02/03 on the interface P.C. board to 2/16/1, and then push the push SW04 for 5
seconds or more after [Er] [ ] have been displayed on 7-segment display.
3) [Er] [ CL] are displayed on 7-segment display. (Error clear completes.)
4) Return SW01/02/03 to 1/1/1. (It is normal if [U1] [– – –] are displayed.)
Set rotary SW01/02/03 to 1/1/1.
[U1] [E26] are displayed.
Set rotary SW01/02/03 to 2/16/1.
[Er] [ ] are displayed.
Push the push-SW04 for 5 seconds or more.
[Er] [ CL] are displayed.
Return rotary SW01/02/03 to 1/1/1.
[U1] [– – –] are displayed.
All the backup setup for the header unit has completed. Check the operation.
11-3-2. In Case of Trouble on Header Unit (Backup setup for header unit)
<Work procedure>
1. Turn off the main power supplies of all the units connected to the system.
[Setup for outdoor unit with trouble]
2. Close fully the gas side service valve of the unit with trouble.
3. Leave service valve of the balance pipe and the liquid pipe fully opened. (To prevent refrigerant stagnation in the unit)
However close fully service valve of the liquid pipe when there is PMV leakage in outdoor unit
(When PMV can not be closed fully)
4. <In case of trouble on the compressor or electric parts system (Compressor, electric system parts, I/F P.C. board, IPDU
P .C. board)>
After then, keep OFF for the main power supply of the unit with trouble.
<In case of trouble on the cycle parts system (Pressure sensor, temperature sensor, refrigerat circuit parts, fan system
parts)>
Remove the communication (Refrigerant circuit) connector [CN03] between outdoor units on the interface P.C. board.
Setup for outdoor unit with trouble
[Selection of header unit]
5. Select a header unit among the follower units based upon the following criteria.
• If only one follower unit is connected, select it as the header unit.
• When two or more follower units are connected, select an outdoor unit nearest to the header unit as the header unit.
7
Interface P.C. board of the header unit
Push-SW04
2
Close service Remove communication connector
valve of gas [CN03] on the interface P.C. board
pipe fully. only when a trouble occurred on
the refrigerant circuit system.
3
Service valves of the liquid pipe and the
balance pipe are kept opened.
(However close the liquid valve when a
leakage occurred on the outdoor PMV.)
230
Segment display
Rotary SW01/02/03
4