DENSO CORPORATION CLASSIC PLUS 26 - Manual (Page 26)

ELECTRICAL SYSTEM
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6. Condensate Pump Kit (optional)
The Classic Plus 26 model comes standard with a drain tank, which collects the water that forms on the
evaporator during normal cooling operation. If the unit is required to operate continuously without periodic
emptying of this tank, a condensate pump may be needed. A condensate pump kit (CPK-4) is available for
the Classic Plus 26 model.
7. Automatic Restart After Power Interruption
The program within the microprocessor of the Classic Plus 26 contains a feature that will automatically
restart the unit after power is lost and then regained. The unit also has memory in order to return itself back
to the operating mode (including temperature set point) it was in prior to the loss of power.
8. Compressor Protection
There is a Time Delay program within the microprocessor. This prevents a heavy load from being applied on
the Compressor Motor when restarting the unit (Cool Mode) after a very short period of time. This “delay” is
in effect any time when the compressor is turned on by either the “Cool On/Off” button, temperature set
point (thermostatic control), or power interruption restart.
Time Delay Program Specifications: 120
±
10 sec.
9. Temperature Control
The compressor operation (Cool Mode) is controlled by the microprocessor which receives input signals
from the room temperature thermistor (evaporator inlet air) and the setting of the Temperature Set Point. The
Temperature Set Point (desired room temperature) can be adjusted by pressing the ▲ / ▼ buttons on the
Control Panel. The adjustment range of the Temperature Set point is 70˚F to 95˚F (21˚C to 35˚C).
10. Fan Mode Control Switch
The fan motor operation is controlled by relays on the relay board through a microprocessor in the control
panel assembly. The fan program in the microprocessor can be changed by a DIP-Switch on the left side of
the Relay Board located in the Control Box. There are two settings:
A. Cool to Stop
When the DIP-Switch is set to the down or “Stop” position, the microprocessor controls the fan motor
using the same room temperature thermistor that it uses to control the compressor. In this case, both
the fan and the compressor stop when the microprocessor receives a sufficiently low intake air (room
temperature) signal from the thermistor (equal to or less than the set point). When the temperature
increases (exceeds the set point) the microprocessor will restart the fan and compressor automatically.
However, if the unit has been off for less than 130 sec., the fan will start before the compressor (time
delay program).
B. Cool to Operate
When the DIP-Switch is set in the up or “Operate” position, the microprocessor controls the fan opera-
tion using control panel inputs only. The fan will operate continuously during Fan Only and Cool Modes.
(This is the “Factory Default” setting.)
11. Temperature Scale Display Switch
When the DIP Switch is set in the down or “˚C” position, the Set Point Temperature will be displayed in
degrees Celsius. The LED that indicates ˚C will also be illuminated.
When the DIP Switch is set in the up or “˚F” position, the Set Point Temperature will be displayed in degrees
Fahrenheit.. The LED that indicates ˚F will also be illuminated. (This is the “Factory Default” setting.)