COTES C35 OPERATING AND SERVICE HANDBOOK page 65/71
HOW TO ADJUST THE AIR FLOW WITH THE HR MODULE
Once the dehumidifier is operating, you should adjust the air flows as follows
Configuration-A:
• Adjust the regeneration air to a flow rate of 15–25% higher than the nominal values given
under SECTION 3 / TECHNICAL DETAILS > Specifications. Check the air flows using a
suitable instrument (pitot pipe/thermo-anemometer or similar) in the duct..
• Check the temperature after the heating elements. The temperature in the regeneration box
is shown on the LCD display inside the electrical box. Make sure the C35 dehumidifier and
HR module are fully heated before you take readings.
• The temperature increase across both the HR module and electric heater should be
approximately +95°C, and must not exceed 125°C. In cases where it is hard to access the
regeneration flow, the temperature increase alone can be used to adjust the flow rate. Be
aware that the maximum temperature will occur when outdoor temperatures are highest. If
exceptionally high ambient temperatures are expected (>30°C), the aim should be a
temperature increase of less than 95°C. The temperature increase can be limited by
increasing the regeneration flow rate. The temperature must be kept lower than 125°C to
avoid causing damage to the switch regulating the heater. If the temperature is too high,
please consult Cotes or your local dealer.
Configuration-B:
• Adjust the regeneration air to a flow rate of 15–25% higher than the nominal values given
under SECTION 3 / TECHNICAL DETAILS > Specifications. Check the air flows using a
suitable instrument (pitot pipe/thermo-anemometer or similar) in the duct.
• Check the temperature after the heating elements. The temperature in the regeneration
system is shown on the PLC display on the front of the dehumidifier. Make sure the C35
dehumidifier and HR module are fully heated before you take readings.
• The temperature increase should be approximately +95°C, and must not exceed 125°C. In
cases where it is hard to access the regeneration flow, the temperature increase alone can
be used to adjust the flow rate. Be aware that the maximum temperature will occur when
outdoor temperatures are highest. If exceptionally high ambient temperatures are expected
(>30°C), the aim should be a temperature increase of less than 95°C. The temperature
NOTE
The nominal figures are based on operation at 20°C. If the air temperature differentiates
significantly from this, the flow rate should be corrected for another density.
For example, if the air flow rate is measured in the regeneration outlet, the volumetric flow
rate of air must be 10–15% higher than the nominal value, due to the lower density of warm
air.
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