Version Nr. 1-5 - 13.06.2022
Doc. No. 99580320001
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4. Settings
Air-air heat exchangers are intended as complementary accessories to large industrial equipment which include
a motor-operated fan or blower together with a heat exchanger module. These may also include an electric
heater. The fan or blower is intended to recirculate air and allow heat exchange. The heat exchanger is
designed for air heat transfer only. Cooling function may be controlled by an on-board or remote controller or
thermostat. Heating function, when installed is provided by an electrical heating element.
The unit seals the cabinet which ensures that the clean air inside does not come into contact with the ambient
air which may well be dirty or polluted. The unit is fit for purpose within the rated/declared ambient conditions
(e.g. dusty and oily air or high air temperatures between 23°F and 131°F), also indicating the rated allowable
ingress and environment. Heat exchangers are used where the heat generated by energy losses in control
cabinets must be conducted away to protect temperature-sensitive components. The characteristic graph
shown in the section “Performance graph” applies to external (ambient) air as the coolant. In air-to-air heat
exchangers, the internal temperature of the control cabinet cannot be cooler than the ambient
temperature. There are natural limits to the cooling performance, dependent on the air supply temperature and
the requirement for a temperature difference of at least 9°F. Unlike systems in which the heat generated is
allowed to escape by air convection through ventilation slots, with the heat exchanger, the clean air inside the
control cabinet is prevented from mixing with the air outside, which may well be unclean.
Controller
The display shows the temperature in the range of -50°C to +150°C (-58°F to +302°F). The temperature is
displayed with resolution of tenths between -19.9°C and +99.9°C (-3.8°F to +211.8°F). During programming, it
shows the codes and values of the parameters. The display also shows icons according to occurring events.
Display icons
Icon Function
Description
1
Cooling relay active
Flashes when activation
is delayed or inhibited by
protection times, external
disabling or other procedures
in progress
2
Alarms relay active
3
Heating relay active
4
Ambient blower relay active
Alarm
Flashes when alarms are active
Heating mode
Signals operation of unit in heating mode
Cooling mode
Signals operation of unit in cooling mode
TEST Test mode in progress
Activated only by manual procedure