Wolf AHU TE Installation And Maintenance Instructions Manual page 27

Cooling coil
(direct-expansion evaporator)
Scrubber
Contact humidifier
3064058_201610
Commissioning
- Check the cold water temperature: min. cold water temperature +2 °C;
if the evaporation temperature is < +2 °C there is a risk of ice forming on the heat
exchanger fins which would obstruct or prevent the air flow.
Antifreeze agents are hazardous to health. Always comply with the safety instructions
issued by the manufacturer of the antifreeze used on site.
Before filling the refrigerant system with refrigerant, take suitable measures to ensure
that no traces of residual moisture remain in the pipework (e.g. evacuate or purge the
pipework with dry nitrogen).
Check evaporation temperature: min. evaporation temperature +2 °C; if the evaporation
temperature is < +2 °C there is a risk of ice forming on the fins of the heat exchanger
obstructing or preventing the air flow.
The direct-expansion evaporator will be unable to achieve its rated performance unless
Note
the refrigerant used is the same as that on which the design was based (R22 or R134a).
Never permit refrigerant to escape to the environment, as otherwise there is a risk of
environmental pollution. Use a vacuum extractor of suitable design.
- Check all pipes and the pump for leaks.
- Check that the nozzle assembly and the nozzles are secure.
- Ensure that the siphon drain is unobstructed.
- Fill the siphon with water.
- Fill the scrubber tray until water drains off through the siphon.
- Briefly start the motor to check the scrubber pump direction of rotation; if required
correct the direction of rotation.
Check the power consumption of the pump motor.
Never permit the scrubber pump to run dry.
Note
The pump can suffer irreparable damage if it runs dry.
- Switch on the air intake fan
- Switch on the scrubber pump
- Adjust the float: Tray water level at least 10 mm above the pump intake , max. 10 mm
below the overflow outlet
- If installed: adjust dry run protection and automatic T.D.S. (in accordance with separate
instructions supplied)
Note: On account of their production-related surface structure, mist eliminators are
subject to disruptive discharges for a limited time.
This is not an engineering defect.
To maximise the service life of the humidifier medium, note the following:
- adequate supply of circulating water (approx. 3 x evaporated volume)
- permanent humidifying of the entire surface
- air temperature, water temperature < 40 °C
- always clean in good time
- operate only with fresh water (clear in appearance, without sediment).
Changing the humidifier medium:
Removal and installation through the inspection door:
- remove the cover plate
- remove the humidifier medium
- install new blocks.
Take care to install the humidifier medium right way round as otherwise mist will be
Note
entrained in the airflow and the humidifier performance will fall significantly short of
requirements.
AHU TE
AHUW TE
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