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ALNOR
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ventilation systems
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User Manual
HRU-PremAIR
• Strap down elastic pipe to siphon plate with included cables ties according to figure 14.
• Level unit according to figure 15.
Elastic pipe should be connected to sewage system. Before first HRU start-up or when syphon is dry please
fill syphon with water (about 0.3L). Syphon must be filled with water to provide correct water flow from
condensation drain. You can fill syphon in two ways:
• Filling water directly into elastic pipe
• Filling water to HRU housing (exhaust side). In this way you must open front cover, take heat exchanger
out and fill water into special groove profiled in housing.
NOTE:
Please remember about syphon filling. If syphon is dry condensate does not drain from housing
(vacuum effect of working fans) and water can leak through housing or damage fan.
Do not fill water inside exhaust duct connection!
Do not fill water when HRU is working!
Figure 12 - holes dimensions for wall mounting
