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Outdoor Unit Backup Operation Setting; Follower Outdoor Unit Backup Operation Setting (Failure Of Follower Outdoor Unit) - Toshiba MMY-MUP0801HT8P-TR Service Manual

Air conditioner multi type, super modular multi system-u smms-u, outdoor
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9-3. Outdoor Unit Backup Operation Setting

<Outline>
This product allows outdoor unit backup operation setting to be performed either at the header unit or a
follower unit. If any of the failure modes specified below occurs to one of the outdoor units in a multi-outdoor
unit system, proceed with outdoor unit backup operation.
• A compressor failure (e.g. a layer short-circuit or a compressor failure in which no compressor is available to
back up the failured compressor)
• A failure of a pressure sensor (Pd or Ps) or a temperature sensor (TD1, TD2, TS1, TS3, TE1, TE2, TE3, TG1,
TG2, TG3, TK1, TK2, TL1, TL2 or TL3)
Note: Keep the number of backed-up outdoor units to one in the system (single refrigerant line).

9-3-1. Follower outdoor unit backup operation setting (failure of follower outdoor unit)

<Work procedure>
(1) Turn off the power supply to all the indoor and outdoor units connected to the system.
[Setup of failed follower outdoor unit]
(2) Fully close the gas pipe service valve of the failed outdoor unit.
(3) Leave the service valve of the liquid pipe fully open (to prevent refrigerant stagnation in the 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 failure in compressor, electrical part, P.C. board>
From this point on, keep the power supply to the failed unit off.
<In case of failure in refrigerating circuit or related part (pressure sensor, temperature sensor, refrigerating
cycle part, or fan system part)>
Disconnect the line for outdoor-outdoor communication [Uc (U5/U6)] and cover the U5 and U6 line with
insulating tape separately. (Do not cover the line by mixing the U5 and U6 line altogether).
Setup of failed follower outdoor unit
[Setup of header unit]
(5) Turn on Bit3 of SW103 on the interface P.C. board of the header unit.
(Setting to prevent connected indoor units capacity over failure (E16))
Uc (U5/U6) wiring treatment
(2)
Fully close gas pipe
service valve.
(3)
Leave service valves of liquid
fully open.
(if there is leakage from outdoor
PMV, fully close liquid pipe.)
- 254 -
(4)
Interface P.C. board of header unit
SW101
SW102
SW103
ON
ON
ON
1 2 3 4
1 2 3 4
1 2 3 4
SW104
SW105
SW107
ON
ON
ON
1 2 3 4
1 2 3 4
1 2
Turn on Bit 3 of SW103.
(5)

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