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2WAY SYSTEM
Control Functions - Outdoor unit
1
11. Backup Operation
2WAY VRF SYSTEM
Control Functions
(1)
1-1. Alarms that result in automatic backup operation
When the following alarm occurs, automatic backup operation is engaged.
Automatic backup operation is not engaged in cases of serious alarm such as communications alarms, etc.
The system includes a function for automatic backup operation. An alarm is displayed on the remote controller to
inform the user that a failure has occurred.
11. Backup Operation
Automatic Backup Operation
Alarm List 1
(Backup operation continues unless power supply of all outdoor units is turned off.)
Function A
1.
2.
When there is one outdoor unit in the system, only compressor that has sensor stops.
When there are multiple outdoor units in the system, only the outdoor unit which contains the problem stops
but the other outdoor units in the system operate normally.
Function B
1.
2.
When there is one outdoor unit in the system, the backup operation does not work.
When there are multiple outdoor units in the system,only the outdoor unit which contains the problem stops
but the other outdoor units in the system operate normally.
<Caution>
After automatic backup control started by alarm shown in “Alarm List 1”, it will not be cancelled automatically
even though the repair work of the failed outdoor unit is finished.
The automatic backup mode will be canceled when only the powered On all outdoor unit is reset.
Then after the repair work is completed, be sure to confirm whether or not the automatic backup mode is canceled.
Alarm display
H03
Description
Compressor / outdoor unit
operation
Inverter compressor 1, CT open/short
H13
Inverter compressor 2, CT open/short
H31
Inverter compressor 1, overcurrent of HIC failure
H21
Inverter compressor 2, overcurrent of HIC failure
P16
Inverter compressor 1, secondary overcurrent failure
P26
Inverter compressor 2, secondary overcurrent failure
P29
Malfunction of inverter compressor 1start
P19
Malfunction of inverter compressor 2 start
P22
Outdoor unit fan motor 1 is unusual.
H07
No compressor oil due to ACV clogged
Function A
H11
Inverter compressor 2, primary overcurrent failure
Function A
H01
Inverter compressor 1, primary overcurrent failure
Function A
Function A
Function A
Function A
Function A
Function A
Function A
Function A
Function B
P24
Outdoor unit fan motor 2 is unusual.
Function B
Function B
2WAY SYSTEM
Control Functions
10. Demand Control
2WAY SYSTEM
Control Functions-Outdoor Unit
10. Upper Current Limitation Mode
(4) When Using Demand Terminal Block
*Demand terminal block is a separate purchase (optional part).
Demand terminal block must be connected in order to perform the demand control.
(It is also possible to connect the optional Seri-Para I/O unit (optional CZ-CAPDC2) and setup the system.)
The current limitation values can be set by changing either contact.
* The rated current indicates the current value that is listed in the catalog or service manual.
* XX and YY are able to set in EEPROM of main outdoor unit.
Check " (3) Serial-parallel I/O " section.
During setting in LV1 - LV3,
[CZ-RTC4]
*
*
In respect of connection method for demand terminal block and Seri-Para I/O unit, refer to the installation
instructions supplied with the unit.
It is also possible to make setting that the display (symbol of demand-activated) is concealed as shown in the
following table.
: Input present
: Input not present
Seri-Para I/O unit
Demand terminal block
COM short circuit
Non
LV1
LV2
LV3
Contact 1 Contact 2
No control
Operates to XX% of the upper
limit for the rated current
Operates to YY% of the upper
limit for the rated current
Control
Forced thermostat OFF setting
Demand meaning
Operates to the maximum capacity.
Current is limited to the set values.
Current is limited to the set values.
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[CZ-RTC5A] (demand-activated) displays on the remote
controller of the indoor unit.
LV3 LV2 LV1 COM
Demand
LV3 LV2 LV1 COM
Terminal block
DRED (Demand controller)
Relay contact point: No voltage relay
Current input is DC 24 V 10 mA
Use a very small electric current contact point for the relay.
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