Connection To The Ducts; Hydraulic Connections - AERMEC DMH Installation Manual

CONNECTION TO THE DUCTS

It is prohibited to start the unit if the fan vents are not ducted or
protected with accident-prevention mesh according to current reg-
ulations.
— Any air ducts must feature a generous size, according to the aeraulic features
of the unit. The available static pressures do not generally allow for high routes
and free intake functioning is the preferred option. The horizontal units are fit-
ted with a removable perforated frame at the back (suction duct to be secured
inside it) and holes on the front panel for a potential introduction duct.
— It is recommended to use insulated ducts to prevent the formation of conden-
sate and attenuate the noise level.
— If using stiff ducts, to prevent transmission of any machine vibrations into the
environment it is recommended to place an anti-vibration joint between the
fan vents and the ducts. The electrical continuity must however be guaranteed
between the duct and the machine via the earth cable.
— Avoid, as much as possible, short-circuits between the air drawn from the rooms
(to be processed) and the air introduced into them (processed).

HYDRAULIC CONNECTIONS

The installation and connection operations of the hydraulic pipes are operations
that can compromise the good functioning of the system or worse, cause irrevers-
ible damage to the machine. These operations must only be performed by special-
ised staff.
Condensate drain connection
— The DMH units are fitted with a drip tray featuring a drain with a 14 mm external
diameter.
— The drain system must have a suitable siphon for preventing the undesired
entry of air into the depressurised systems or the undesired exit of air in pres-
surised systems. This siphon is also useful to prevent the infiltration of odours
or insects.
— The dimensioning and version of the siphon are reported in the figure.
12
— The siphon must finally have a cap for cleaning the lower part or must however
allow quick disassembly for periodical cleaning.
— The route of the condensation drain pipe must always be tilted outwards, as
well as being as short as possible and with as few bends as possible.
— Always make sure that the condensate flow pipe does not stress the unit drain
connection, envisioning suitable bracketing.
Water pre- and post-cooling system
— It comes with "female" couplings with a GAS threading (positioned inside in the
recessed version).
— Tightening must be performed carefully to prevent damage to the collectors
in the coil.
— The water inlet and outlet must allow for the counterflow thermal exchange:
therefore, follow the directions of the WATER INLET and WATER OUTLET.
— Provide for a water drain valve in the lowest point. If the route of the piping
is longer than the route of the connections, also provide for an air vent valve
in the highest point. The unit is fitted with its own air vent valve near the top
connection.
— Clamp the pipes adequately to the outside of the unit to prevent the weight
being unloaded onto the coil.
— Insulation must be flush to the panel in order to prevent the danger of con-
densation.
— Envision on-off valves to isolate the machine from the rest of the circuit in the
case of extraordinary maintenance.
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