Back-Up Operation; Emergency Operation; When One Compressor Has Failed (Back-Up Set-Up Of Compressor); When An Outdoor Unit Has Failed - Toshiba HFCR407C Service Manual

When one compressor has failed (back-up set-up of compressor)

Outline
When one of two compressors installed in the outdoor unit fails, take the following action if emergency operation by another
normal compressor is possible.
In the case of single compressor installed unit (6HP), back-up operation by one compressor is unavailable. In
• NOTE 1:
this instance refer to the "Emergency Operation when an outdoor unit has failed" section.
For the emergency operation when the failed compressor is an inverter, the capacity control is performed by
• NOTE 2:
ON/OFF control of fixed-speed compressor.
When motor winding of the compressor fails (Short, etc.), do not set back-up of the compressor because
• NOTE 3:
deterioration of oil will occur.
(Another error in the outdoor unit may be caused.)
Work procedure
(1) First, turn off the power source of all the outdoor units which are connected to the system.
(2) The following works are performed to the outdoor unit of which the compressor failed.
According to the following table, set DIP switch (SW06) on the interface PC board.
Table switch set-up in compressor back-up
Initial set-up at shipment from factory
No. 1 compressor (INVERTER) (Front left compressor) has failed
No. 2 compressor (FIXED) (Front right compressor) has failed
(3) Back-up set-up is now complete. Turn on the power source of all the outdoor units.

When an outdoor unit has failed

In this air conditioner, back-up operation is permissible to both an inverter unit and a fixed-speed unit when an outdoor unit
has failed.
In a system in which two or more outdoor units are connected, perform the emergency operation for failure of outdoor unit
when alarm mode, such as one of the following cases, occurs.
(1) Fault of compressor (Short or when one compressor is not operating)
15
(2) Fault of pressure sensor (Pd, Ps)/fault of temp. sensor (TD1, TD2, TS, TE, TK1, TK2, TK3)
(3) Fault of refrigerating cycle parts, fan system parts, interface PC board, inverter PC board, electric part system, etc.
CAUTION: Emergency operation should only be completed on 1 outdoor unit per system.

Back-up operation

Emergency operation

SW06
Bit 1
OFF
ON
OFF
122
Bit 2 Bit 3
OFF OFF
OFF OFF
ON OFF
Bit 4
OFF
OFF
OFF