Electrical Connections To A Zone Heating System; Removing Scale From The Dhw Circuit; Dismounting The Water-Water Heat Exchanger - Baxi Luna 3 Silver Space Series Operating & Installation Instructions Manual

28. ELECTRICAL CONNECTIONS TO A ZONE HEATING SYSTEM

Connect the contact relative to heating requests in zones that are not controlled by the remote control device in parallel
to terminals 1-2 "TA" on terminal board M1 in figure 19.
The zone controlled by the remote control device is managed by the zone 1 solenoid, as illustrated in figure 19.
Figure 19

29. REMOVING SCALE FROM THE DHW CIRCUIT

The DHW circuit can be cleaned without removing the water-water heat exchanger if the assembly is fitted with the special
tap (available on request) located on the DHW outlet.
To clean, proceed as follows:
• Turn off the DHW inlet tap
• Drain the DHW system by opening a hot water tap
• Turn off the DHW outlet tap
• Unscrew the two stopcocks
• Remove the filters
If the special tap is not supplied, dismount the water-water heat exchanger, as described in the next section, and clean it
separately. Remove the scale from the seat and relative NTC sensor fitted on the DHW circuit.
To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.

30. DISMOUNTING THE WATER-WATER HEAT EXCHANGER

The stainless steel plate-type water-water heat exchanger is easily disassembled with a screwdriver by operating as
described below:
• drain the system, just the boiler if possible, through the drain tap;
• drain the DHW system;
• remove the two screws at the front securing the water-water heat exchanger and pull it out (figure 20).
INSTRUCTIONS FOR FITTERS
REMOTE CONTROL
UNIT
ZONE 1
ZONE 2
(AMBIENT THERMOSTAT)
SOLENOID
ZONE 1
ZONE 3
(AMBIENT THERMOSTAT)
76
ZONE N
(AMBIENT THERMOSTAT)
925.523.1 - EN