![Alutherm heating B350 Instructions For User Download Page 38](http://html.mh-extra.com/html/alutherm-heating/b350/b350_instructions-for-user_2915035038.webp)
ALUTHERM
|
Boilers 38
ALUTERM B 350 - 600
|
Installation, User and Service Manual
|
instructions for user
Heating
Alutherm B 350 - 600
6.6
Electrical connection
1. The electrical installation should be in accordance with national and local codes and regulations.
2. As standard the boiler is configured for 230 VAC / 50 Hz
3. The terminal strip is accessible by opening the front cover (unscrew with hexagonal wrench) behind which the control is mounted.
4. A means of disconnection must be incorporated in the fixed wiring in accordance with the wiring rules. Use the lower cable guide indicated with
a 230 VAC sticker on the backpanel of the boiler. As it is a stationary appliance without means for disconnection from the supply a contact
separation in all poles that provide full disconnection under voltage category III must be provided. The minimum cross section of the supply wire
is 3 x 1.0 mm2 and must be connected to the numbers, 1 (=PE), 2 (=L) and 3 (=N) of strip C1. The supply wire should be secured by a pull relief.
5. It is not permissible to alter the internal wiring as fitted by the manufacturer.
6. The enable connected to numbers 1 and 2 of the strip C2 must be Volt free (also see warning under 4.2.1). To set, select from the technician menu,
advanced settings, CH request to Room Tstat. The 0-10 V DC (Power or Setpoint mode) should be connected to the numbers 3 (=negative-) and
4 (=plus+) and a short wire loop should be placed between the numbers 1 and 2 of strip C2. To set, from the technician menu, advanced CH
settings, CH request select either 0-10V % (power mode) or 0-10 V SP (setpoint mode).
Digital communication (open Therm OT+ version 3.0) should be connected to the numbers 1 and 2 of the strip C2. Select from the technician
menu, advanced CH settings, CH request for Room Tstat.
For digital communication with EBV like RS30 or Theta an additional communication module is required.
For the internal OTC (outdoor temperature controller) a 12 kohm at 25º C (see NTC table at 6.2.2) should be connected to the numbers 5 and 6 of
strip C2 and a short wire loop should be placed between the numbers 1 and 2 of strip C2. Finally from the technician menu, advanced CH
settings, CH request, select only OTC.
7. If a storage tank is connected to the boiler, the tank thermostat (or the tank NTC) should be connected to the numbers 7 and 8 on the strip C2.
Select fom the technician menu, advanced DHW settings, DHW request type.
Note that a tank NTC should be12 kohm at 25 ºC (see NTC table at 6.6.2.)
8. The CH system pump should be connected to the numbers 9 (=PE), 10 (=L), 11 (=N) on strip C1 if in use in combination with a 3-way valve. (also
see chapter 4.3). A PWM pump should be connected to 18 (=PE), 19 (=L) and 20 (=N) on strip C1.The PWM signal should be connected to 14 (PWM
signal) and 13 (PWM ground) om strip C2. From the technician menu, system settings, boiler parameters the max and min pump speed can be set.
9. The DHW pump (or 230 VAC 3-way valve) should be connected to 12 (=PE), 13 (=L), and 14 (=N) on strip C1. If a CH pump is used it should be
connected to 15 (=PE), 16 (=L) and 17 (=N) on strip C1.
10. If the system pump, CH pump, PWM pump, DHW pump, alarm connection or the 3-way valve consumes more than 0,8 A, it needs to be switched
by an auxiliary relay.
11. The alarm output on the numbers 24 and 25 on strip C1 is a potential free relay output (230 VAC), max 0,8 A).
The cascade/system pump output on the numbers 29 and 30 on strip C1 is a potential free relay output (230 VAC, 0,8A).
12. The B-B (Burner Block) on the numbers 31 and 32 on strip C1 provides an external (remote) burner block (error 76). The external contact must be
a potential free contact (rated at 230 VAC).
13. The SPS_B (Burner Block) on the numbers 11 and 12 on strip C2 also provides an external (remote) burner block (error 77). In this case the external
contact must be a potential free contact (24 VDC).
14. The B-L (Burner Lock) on the numbers 9 and 10 on strip C2 provides an external burner lock (error 3). The external contact must be a potential
free contact (rated at 24 VDC).
15. The main-fuse (10,0 A) is near the on/off switch on the right side of the control panel.
16. If the supply wire needs to be replaced, act as described under 4.
17. Connect current carrying conductors in such a way that they become taut before earthing conductor. See figure beneath