14
Safety precautions:
The unit must be mounted to a rigid and stable structure. Check the technical parameters and the unit weight.
The unit must be suspended using anchor bolts. Before starting mounting check that the mounting structure has sufficient loading
capacity for the unit weight, otherwise reinforce it with beams, etc. After that fix the bolts. If the construction strength or surface is not
rigid enough it can resonate with the unit and create abnormal noise and vibration.
While mounting the unit provide enough service space and an access door in the ceiling for inspection and maintenance of
the filters, heat exchanger and fans. One access door is required for each unit. For details, refer the outline drawing (ref. Fig. 1).
Insert the anchor bolt inside the mount for the fixing bracket and fix it with nuts and washers.
Make sure the unit casing has no foreign objects inside, like paper and foil.
If the bolts used for the unit mounting are too short the unit can generate abnormal noise and resonate with the ceiling.
If the connection point to the spiral seam duct is supposed to be the source of the abnormal noise, install a flexible air duct instead
of the spiral seam one. The precautions referred above are normally sufficient to solve the resonance problem.
For the better effect you may use anti-vibration connectors. To ensure the best performance of the unit provide a straight 1 m duct
section on both sides of the unit while mounting . Access to the unit must be prevented by installing a protecting grille or any other
device with the mesh width up to 12.5 mm. In order to attain maximum power the water heater should be counter-flow connected
(Fig. 13).
All calculation diagrams (ref. Fig. 2-9, page 5-9) are valid for the counter-flow connection of the water heater. In case of the direct-
flow connection the water heater has lower power but higher frost-resistant properties.
Fig. 13. Water heat connection
b) counter-flow connection
а) direct-flow connection
VUT 1500 WH AND VUT 2000 WH UNITS MODIFICATIONS
DEPENDING ON THE SERVICE SIDE
Left- and right-handed modifications are provided for ease of mounting and maintenance:
INTAKE AIR
SUPPLY AIR
EXHAUST AIR
EXTRACT AIR
INTAKE AIR
SUPPLY AIR
EXHAUST AIR
EXTRACT AIR
Service side
Service side
Left-handed modification
Right-handed modification
