Installation
1
Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
19
Subject to modifications resulting from technical improvements !
Buderus • http://buderus-domestic.co.uk
1.9.3
Connecting a three-way valve of an external
storage-type water heater
z
Three-way valve with plug:
Connect the plug-and-socket connector to the plug of the
external storage-type water heater (fig. 21).
z
Three-way valve without plug:
Connect the three-way valve to terminals 9 and 11 of the
terminal strap (fig. 22, item 5).
1.9.4
External controls
The wall-mounted condensing gas boiler can be fitted with the
following control devices:
– Buderus programmable room thermostat
(see subsection 1.9.5).
– A room-temperature control device at 230V connected to
the RTH converter (see subsection 1.9.6);
– ON/OFF temperature controller, volt free
(see subsection 1.9.7);
If the boiler has to be temporarily put into operation without
control unit, place a conducting bridge in terminal 1
2 and set
the feed temperature and the required heating capacity on the
UBA.
1.9.5
Buderus room temperature control device
connection
z
Remove the bridge in terminal 3
4 (fig. 22, item 2) and
connect the control unit to the terminal strap.
z
Remove the wire in terminal 1
2 (fig. 22, item 1).
1.9.6
230V room-temperature control device connection
z
Remove the cover of the RTH converter (fig. 22, item 6).
z
Lead the control device wire through the cable lead (fig. 22,
item 8).
z
Fix the wire to terminal 1 and 2
of the 230 Volt connection
(fig. 22, item 9).
z
Secure the wire with the bracket and the two screws onto
the RTH converter.
1.9.7
Volt free external control device connection
z
Remove the cover of the RTH converter (fig. 22, item 6).
z
Lead the control device wire through the cable lead.
z
Fix the wire to terminal 1 and 2
of the volt free connection
(fig. 22, item 10).
fig. 21 Connecting a three-way valve of an external storage-type
water heater
fig. 22 Connecting the control unit
Key to fig. 22:
Item 1:
ON/OFF temperature controller (non-conducting bridge)
Item 2:
Room temperature controller
i
RT (digital)
Item 3:
I/O port/communication port
Item 4:
Outdoor temperature sensor
Item 5:
Power supply 24 VAC/max: 6 VA switching voltage
three-way valve (9+11)
Item 6:
RTH converter
Item 7:
24 VAC connection
Item 8:
230 VAC connection
Item 9:
Volt free connection
2
4
5
6
7
8
10
11
12
1
3
1
2
3
4
9
5
6
0 VAC
0 V
24 VAC
- max. 6VA
1
2
3
4
5
6
10
9
7
8
NOTE
RTH converter is no longer in use.
