Start-Up; Tests; Connection Of Different Units To One Timer - Accorroni MEC25-85 Technical Information

to be used as a general switch to turn off the
appliance.
Insert the power supply cable through the special
cable gland, making sure to cut the wires so that
the yellow/green earth cable is longer than the
other two. This precaution, in case of accidental
detachment , allows the earth cable to be the last
connection to be removed. The power supply
cable shall have a cross-section of 3 x 1.5 mm²,
with an external diameter of 9.8 mm.
Connect the power supply cables to the phase (L)
and neutral (N) attachments of the network filter
(FR) and to the special air heater earth tower (see
wiring diagrams). When connecting the phase
and neutral wires, use the faston type terminals
6.3 x 0.8 mm supplied with the appliance.
Comply with the phase/neutral polarity,
otherwise the control equipment will genera-
te a safety lock out.
THESE APPLIANCES MUST BE EARTHED.
4.4.5 Using the remote-control panel
(supplied on request)
The remote-control panel (fig. 23) includes the
main appliance control functions (on-off switch,
electronic room thermostat, lock out and operating
signals, reset button, summer ventilation). It is
supplied in a kit, including an appliance connection
cable, anchor bolts with screws for wall mounting
and the necessary instructions. The connection,
already available on the appliance board, must be
performed by a qualified electrician.
WARNING! If the panel is attached to a metal
structure, such a structure must be earthed.
4.4.6 Using the room thermostat, timed
thermostat or timer (not supplied)
A bridge has been installed in the appliance
electric board for external OP controls - see wiring
diagrams - between the faston connectors (type
4.8 x 0.8 mm) J14 and J15. Remove the bridge and
connect the above-mentioned attachments to the
terminals of the regulation device switch. It is
recommended to use a double-insulated cable for
which the external diameter ensures the seal of
the cable gland entering the appliance.
When using a thermostat or timed thermostat, it
must be installed in a position that is easy to
access and avoids exposure to air flows, heat
sources or excessive humidity, which may affect
the temperature measurements.
The regulation device must conform with the
current standards and must be installed in
compliance with the standards.
4.4.7 Connecting more than one unit with a
single timer
To operate several appliances with just one timer
follow the diagram reported in fig. 22, using the
same connections J14 and J15 described in the
previous point. To complete this special
connection, use a normally open contact relay
with an adequate rating.

5. START-UP

WARNING! The appliance initial start-up
operations and the relative tests must be
performed by skilled technical personnel.

5.1 TESTS

5.1.1 Before starting the air heater, make sure that
all the current provisions and standards relative to
the installation of these appliances have been
observed, especially for what concerns the correct
positioning of the combustion product exhaust
duct and gas supply piping.
5.1.2 Make sure that the 230 V ~ single-phase 50
Hz electric power supply and the relative earth
wire are connected correctly to the air heater
electric board.
5.1.3 Check that the gas injectors mounted on the
burner correspond to those indicated for the type
of gas to be used (table on page 18).
The appliance are delivered already set in
the factory to use natural gas G20, with a
supply pressure of 20 mbar. Instead, if the
gas from the third group is used (G30 - G31),
first carry out the operations described in
point 6.1.
1°
air heater air heater
J14 J14
J15 J15
Neutral
Phase
page 26
2° n°
air heater
J14
J15
n
2
1
Relay with n
Timer
contacts
switch
n
2
1
Fig. 22