Frico PA3500 Serie Instrucciones De Instalacion Y Uso página 37

Connecting the water coil (W)
The installation must be carried out by an
authorised installer.
The water coil has copper tubes with
aluminium fins and is suitable for connection
to a closed water heating system. Steel
connection pipe. The heating coil must not be
connected to a mains pressure water system
or an open water system.
Note that the unit shall be preceded by a
regulating valve, see Frico valve kit.
The water coil is connected on top of the
unit (horizontal mounting) or on the reverse
(vertical mounting) via connections DN20
(3/4''), external thread. Flexible hoses are
available as an accessory, see accessories
pages.
The connections to the heating coil must
be equipped with shut off valves (included
in Frico valve kits) to allow problem free
removal.
A vent valve should be connected at a high
point in the pipe system. Air valves are not
included.
For vertical installation and bottom water
connection it is not possible to bleed the coil
in the unit. Ensure that the water coil is filled
with water and that no air remains, prior to
commissioning. See fig. 4.
1. Connect the unit and ensure that the shut
off valves are closed.
2. Before filling, remove the bottom plug from
the water coil's return line (A).
3. Place a cloth or similar under the hole where
the plug was to prevent any spillage.
4. Carefully fill the system slowly by opening
the supply line shut off valve a bit (or control
valve).
5. When water comes out of the hole, the water
coil circuits are full of water. Shut off using the
shut off valve (or control valve) and reinstall
the plug.
6. The water coil is now full.
NOTE: Care must be taken when connecting
the pipes. Use a wrench or similar to hold the
air curtain connections to prevent straining
of the pipes and subsequent water leakage
during connection to water supply pipe-work.
Adjustment of the air curtain and air flow
The direction and speed of the air flow should
be adjusted considering the load on the
opening. Pressure forces affect the air stream
and make it bend inwards into the premises
(when the premises are heated and the
outdoor air is cold).
The air stream should therefore be directed
outwards to withstand the load. Generally
speaking, the higher the load, the greater the
angle that is needed.
Basic setting fan speed
The fan speed when the door is open is set
using the control. Note that the air flow
direction and fan speed may need fine
adjustment depending on the loading of the
door.
Filter (W)
The water coil is protected against dirt and
blockage by an air filter which covers the
coil face. In environments where the filter
needs cleaning often, it is advisable to use an
external intake filter (see accessories pages),
which provides an easier maintenance, since
the unit does not need to be opened.
Service, repairs and maintenance
For all service, repair and maintenance first
carry out the following:
1. Disconnect the power supply.
2. Loosen the screws and raise the front panel.
The front is blocked in open position with
the front hatch hook, see fig 1A or removed
completely, see fig. 1B. The service hatch is
removed by loosening the screws.
3. After service, repairs and maintenance fasten
the service hatch and the front. When the
front has been removed it it important to be
sure it is firmly seated in the front locks again,
see fig. 1B.
GB
37