Replacing Parts; Control Equipment; Fuse; Gas Solenoid Valves - Accorroni MEC25-85 Technical Information

8. REPLACING PARTS

Since specific technical skills are required to
replace the parts listed below, it is
recommended to advise the user to always
contact skilled technical personnel. For safety
and quality reasons, it is recommended to
use original spare parts when replacing
components.
WARNING! All the following operations must
be carried out while the air heater is turned
off, disconnecting the gas and electric
supplies.

8.1 CONTROL EQUIPMENT

Disconnect the cables pulling on the relative
terminals and extracting the connectors, releasing
them first from the special retainer. Replace the
equipment, attached using the two self-threading
screws. Insert the terminals and the connectors
into their respective housings (fig. 28).

8.2 FUSE

Using a special tool, remove the fuse on the
printed circuit board on the electric panel inside
the air heater. The new fuse must have the same
characteristics as
"instantaneous", certified and with a rating
corresponding to the technical data table on page
18. Replace the fuse with the new on exerting
slight pressure until it enters the housing.

8.3 GAS SOLENOID VALVES

8.3.1 Models 25 - 30 - 35
Disconnect the electric connection on the gas
unit. Remove the screw that attaches the coil
block and remove it from the housing. Pull out the
coils from the metal cage and replace them with

CONTROL EQUIPMENT REPLACEMENT

Connectors and terminals
for electrical connections
the original one:
Equipment enclosure
Fig. 28
GAS UNIT COIL REPLACEMENT
Gas unit
Solenoid valve coils
new ones. Replace the coil block into the housing
on the gas unit, tighten the fastening screw and re-
establish the electrical connection (fig. 29).
8.3.2 Models 50 - 57 - 85
Disconnect the electrical connection of the
defective coil. Remove the screw that attaches
the coil to the gas unit and remove it from the
housing. Insert the new coil, tighten the fastening
screw and re-establish the electrical connection
(fig. 30).

8.4 DIFFERENTIAL PRESSURE SWITCH

Disconnect the electrical connection and the silicon
tube. Loosen the fastening screws and remove
the pressure switch. Mount the new pressure
switch and re-establish the electrical connection
making sure to respect the position of the contacts.
Re-insert the silicon tube (fig. 31).
GAS UNIT COIL REPLACEMENT
Fastening
screw
Solenoid
valve coil
page 33
Models 25 - 30 - 35
Coil cage
Fastening screw
Models 50 - 57 - 85
Coil cage
Gas unit
Fig. 29
Solenoid
valve coil
Fig. 30