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4 : OPERATION
4.1 General functions
NOTICE
Danger of damage to the cooling unit
Operation without the unit cover prevents the adequate supply of air to the condenser and limits the intended heating function.
• Only operate the cooling unit with the unit cover installed.
• Once assembly and installation work is completed, switch on the power supply to the cooling unit.
• After the supply voltage has been connected and the door is closed, the units run continuously.
• The cooling unit is equipped with an electronic control unit. A temperature sensor detects the temperature of the air sucked
in from the interior of the switch cabinet.
• If the upper or lower limit temperature is exceeded or undercut, a fault indication is triggered.
• The ambient conditions and switch cabinet interior temperatures must correspond to the prescribed technical data; see
Technical data.
• The ambient temperature must be less than 55°C (45°C for the DTS 3021/3031/3031 SS & 3041).
4.2 Operation of the cooling unit
• After connection of the mains voltage, the device switches to operating mode.
• If cooling mode as needed; this will take place depending on whether a temperature switching threshold (TSet) is reached or
undercut.
• Cooling mode switches off when the temperature switching threshold (TSet) is undercut.
• The evaporator fan (internal), condenser fan (external) switch off when the door is opened.
Operating conditions
• The mains voltage must lie within the specified range; see
Electrical data.
• A deviation of ± 10 % is permissible.
• The ambient temperature must be below 55 °C (45°C for the DTS 3021/3031/3031 SS & 3041). For further options, see
Technical
data.
• The cooling unit must only be used in such a manner as to ensure that the specified cooling capacity is able to meet actual
demands.
• Only the specified coolant may be used.
Page 17
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OPERATING MANUAL DTS
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