Frico AREC4000 Series Original Instructions Manual page 23

Unit with electrical heating
The electrical connection is made on the
top or side of the unit. See Fig.2. 208V3~/
480V3~/ 600V3~ power supply for heat
and control*1 *2 should be connected to a
terminal block in the primary terminal box.
Note! If you want to divide the
!
output between two connection
points, the series cabling must first be
removed (AREC4020/25, 2x480V3~/600V3~).
See wiring diagrams.
*1 480V3~/ 600V3~ Control supply is
transformed via internal transformer to
230V~ and routed through 2x 10A fuses in the
primary terminal box.
*2 208V3~ Control supply is connected
internally through 2x 10A fuses in the
primary terminal box.
The largest cable diameter for the terminal
block is 16 mm²/0.025 in². The cable
glands used must meet the protection class
requirements. In the distribution board it is
to be indicated that "the air curtains can be
supplied from more than one connection".
Start-up (E)
When the unit is used for the first time or
after a long period of disuse, smoke or odour
may result from dust or dirt that has collected
on the element. This is completely normal
and disappears after a short time.
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. 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 connections to the heating coil must
be equipped with shut off valves to allow
problem free removal. Water coil is equipped
with a drain and a vent valve. The water coil
is connected via connections with dimensions
DN20 (3/4''), inside thread, inside the unit.
Knockouts are placed on the top and the side
of the unit.
AREC4000
Hoses are mounted via cable glands at
knockouts to protect the hose and prevent air
leakage. Fig. 5
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 internal air filter which covers
the coil face.
Service, repairs and maintenance
For all service, repair and maintenance first
carry out the following:
1. Disconnect the power supply.
2. The service hatch is opened by loosening
the snap fixings located on the bottom of
the unit (turn 90°). Fig. 3 .
3. After service, repairs and maintenance
close the service hatch and make sure that
the snap fixings lock properly.
EN
23