Header Outdoor Unit Backup Operation Setting (Failure Of Header Outdoor Unit) - Toshiba MMY-MAP1006FT8(J)P-E Service Manual

9-3-2. Header outdoor unit backup operation setting
(failure of header outdoor unit)
<Work procedure>
(1) Turn off the power supply to all the units connected to the system at the source.
[Setup of failed header outdoor unit]
(2) Fully close the discharge gas pipe and suction gas pipe service valve of the failed outdoor unit.
(3) Leave the service valves of the liquid and balance pipes fully open (to prevent refrigerant stagnation in the failed
outdoor unit).
However, if there is a leakage from an outdoor PMV (unable to close), fully close the liquid pipe service valve.
(4) <In case of fault in compressor, electrical part, I/F P.C. board, or IPDU P.C. board>
From this point on, keep the power supply to the failed unit off.
<In case of fault in refrigerating circuit or related part (pressure sensor, temperature sensor, refrigerating cycle
part, or fan system part)>
Disconnect the connector [CN03] for outdoor-outdoor communication (BUS2) provided on the interface P.C.
board.
Setup of failed follower outdoor unit
(2)
Fully close discharge
gas
pipe and suction gas pipe
(3)
Leave service valves of liquid and balance pipes fully open.
(If there is leakage from outdoor PMV, fully close liquid pipe.)
− 241 −
(4)
In case of fault in refrigerating circuit
or related part, disconnect BUS2
communication connector [CN03] on
interface P.C. board.