True TSCI Series, Руководство по установке

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TEC_TM_098 REV. A 10/12/2020 Page 12 of 32
S C I E N T I F I C S E R I E S
Cabinet Operation (cont.)
Sequence of Operation
When the cabinet is plugged in…
1.
The lights turn on.
a.
The display illuminates.
b.
The interior light will illuminate on Glass Door Models only. Solid Door cabinet lights are controlled by the door switch.
2.
The evaporator fan starts.
3.
After the pre-programmed temperature control 3 min delay, the compressor will start if the control calls for cooling.
a.
The control or condenser fans are pre-programmed from the factory so at the start of every compressor cycle, the condenser
fan(s) will reverse for 30 sec to blow dirt off the condensing coil.
4.
The temperature control cycles the compressor on and off as determined by the set-point and differential temperatures.
a.
The temperature control is designed to read and display a cabinet temperature. The most accurate temperature on a cabinets
operation is to verify the product temperature.
b.
The set-point is the adjustable pre-programmed temperature designed to match the average cabinet temperature.
c.
The differential temperatures are the non-adjustable pre-programmed temperatures used to determine when the
compressor shuts off and turns on.
i.
The high differential is added to the set-point and determines when the compressor turns on (cut-in temperature).
ii.
The low differential is subtracted from the set-point and determines when the compressor turns off (cut-out temperature).
Set Point ( SP ) = 39°F (4°C)
High Differential ( hY0 ) = 2°F (1°C) SP + hY0 = Cut-In
39°F (4°C) + 2°F (1°C) = 41°F (5°C)
Low Differential ( hY1 ) = 2°F (1°C) SP - hY1 = Cut-out
39°F (4°C) - 2°F (1°C) = 37°F (3°C)
5.
The temperature control may be pre-programmed to initiate defrost by interval or evaporator temperature.
a.
The compressor will turn off until a pre-programmed temperature or duration is reached.
6.
This control is pre-programmed where an audible alarm will activate when the cabinet temperature is above 46°F (8°C) for 5
consecutive minutes.
hi will appear on the display, indicating a high temperature alarm is active.
NOTE: These values may vary by model. See “Adjust Temperature Alarm Ranges” to adjust the temperature alarms for your
application.
a.
To silence the audible alarm, press any button on the display.
b.
The display will continue to show
hi
until the cabinet temperature drops below 46°F.
This alarm will likely activate during
an initial pulldown (plug-in).