Setting Of Compressor Delay Time - NuAire NU-9728GA Instruction Manual

SETTING OF COMPRESSOR DELAY TIME

The delay time of high and low stage side compressor can be changed to reduce the load on the power
line and to facilitate the start-up (reset) of the freezer after power failure.
The example in the table 6 is based on the assumption that the delay time is changed to 4 minutes.
(The delay time is set in 3 minutes at the factory.)
Note:
• The delay time should be the same for high stage side and low stage side compressors.
• The setting range for delay time is between 3 and 15 minutes. The cool down of chamber temperature
may be slow when the setting of delay time is over 5 minutes, depending on the installation environment.
There is no need of changing the delay time when the capacity of power source is adequate.
Table 6. Setting procedure for delay time (change from 3 minutes to 4 minutes)
Description of operation
1
Press numerical value shift key for
2
5 seconds.
Set the figure to F05 with the
3
numerical value shift key.
4 Press set key.
Set the figure to 004 with the
5
numerical value shift key.
6 Press set key.
• The compressor starts to operate with the delay time set by the above procedure at the time of power on
or after power failure. However, the start up of the low stage side compressor is affected by the chamber
temperature and the cascade condenser temperature. The delay time varies depending on how they
meet the start up conditions. It is more than four minutes in case of the above example.
• The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation.
Key operated
The current chamber temperature is
----
displayed.
The first digit is flashed.
When pressed, the figure of settable
digit changes.
The current delay time is displayed.
SET
The first digit is flashed.
When pressed, the figure of the first
digit changes.
The delay time is memorized and
the current chamber temperature is
SET
displayed.
18
Indication after operation