B
9
SAGINAW CONTROL & ENGINEERING • A/C USER MANUAL
back to top
11. Electrical Connection
12. Controller Programming
The cooling unit is used where heat needs to be dissipated from electrical control cabinets or similar enclosures in order to
protect heat sensitive components. The unit has two completely separate air circuits which ensure that the clean cabinet
air does not come into contact with the ambient air which may well be dirty or polluted. Control cabinet air conditioners can
dissipate large quantities of heat from sealed enclosures, such as control cabinets, into the ambient air and at the same time
reduce the cabinet internal temperature to below that of the ambient air.
The control cabinet air conditioner can function without problems in extreme ambient conditions (e.g. dusty and oily air)
with a standard operating temperature ranging between -4°F and 131°F. The stated cooling capacities are according to DIN
3168.
Door Switch
The unit can be switched on and off via a door contact switch. When delivered the door contact terminals are bridged on the
female connector. To connect the door contact switch remove the bridge and connect door contact switch. The contact must
be closed when the cabinet door is closed.
Controller
The unit is equipped with a temperature controller which regulates the function of the refrigeration cycle. In normal working
conditions, the display shows the temperature inside the enclosure. The cooling set point for the interior of the enclosure
(parameter St/St1) is pre-set at 95°F/35°C and can be adjusted between 68°F/20°C and 122°F/50°C.
The heating set point for heating of the enclosure (parameter St2) is pre-set at 41°F/5°C and can be adjusted between
-4°F/-20°C and 66°F/19°C.
The unit also has a High Temperature Alarm relay (normally closed configuration) that is pre-set to switch on when the
enclosure temperature exceeds 131°F/55°C. If necessary, the alarm relay configuration and set point can be changed via
the controller parameters.
To Change the Cooling Set Point St/St1:
1. Press the SET button until St/St1 appears on the display.
2. Use the UP and DOWN buttons to adjust the temperature setting.
3.
Press the SET button to save the new setting.
To Change the Heating Set Point St2:
1. Press the SET button until St/St1 appears on the display and release the button.
2. Press the SET button again until St2 appears on the display.
3. Use the UP and DOWN buttons to adjust the temperature setting.
4.
Press the SET button to save the new setting.
*Important Note
: When changing settings ensure that (St2 + 5K) < St1
The cooling unit manufacturer is in no way liable for any alterations the customer may make to the factory set parameters,
unless the manufacturer has authorized the customer in writing to change them.
