EN
UAB AMALVA we reserve the right to make changes without prior notice
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D2-18-01
4.2. Heating coil connection
1
Pipe work should be connected in accordance with good engineering practice. All pipe work must be ad-
equatelysupported to ensure that no additional load is stressing the unit. Mounting the pipes on the heating coil,
tight the pipes with spanners. As shown in 20 Picture.
Fitting Pipes Connection
20 a Picture
Sensors Installation
20 b Picture
The pipe work should be done in order to ensure the space for maintenance and service work. When carrying out
the installation of heater pipes, make sure that hot water supply is completely disconnected. Before start-up of
the air handling unit, the heater system should be filled in with water. Glycol is used in the air handling units with
coil heat exchanger. Never pour glycol down a drain; collect it in a receptacle and leave it at a recycling centre or
the like. Glycol is highly dangerous to consume and can cause fatal poisoning or damage the kidneys. Contact a
doctor! Avoid breathing glycol vapour in confined spaces. If you get glycol in your eyes, fush them thoroughly with
water (for about 5 minutes).
When operating air handling unit in the temperatures lower than 0 °C, it
is necessary to use glycol additionally or assure the reversible heating
agent temperature more than 25 °C.
It is important to maintain air heaters and coolers cleanliness; that is to
change filters installed in the air handling unit on time. If the air heater or
cooler gets dirty, to perform periodical cleaning.
4.3. Ductwork
The air flows in/out air handling unit through ductwork. We recommend using galvanized steel (Zn 275 gr/m
2
)
ductwork, to ensure easy cleaning and durability. It is necessary to use the ductwork system with low air flow
rate and small pressure drop to have necessary air volume and low sound level and save the energy. The
appropriate sound attenuators will reduce the noise level of the fans in the premises. All ductwork should be
insulated with 50–100 mm thickness insulation to avoid the condensation.
Note:
temperature sensor B1 has to be mounted in the supply air duct under electric heater (see the functional
diagram in Control System Electrical Installation and Operation Manual). It is necessary to leave space in
straight air duct for sensor mounting and guarantee the space for maintenance and service work. Minimal
space between the unit and B1 sensor is the space of double air duct diameter.
Ductwork, steelwork and any other services should not be supported
off the unit.
It is recommended to install air dampers in the inlet and outlet ducts. For
ventilation units with water air heater, it is mandatory to use inlet air closing
damper with spring return mechanism.
1
If water heater build in.
