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29
F
IG
. 38
13. Electrical Connections
(continued)
13.2
Connecting Zone Valves (System A)
The boiler can be connected to a central heating system that uses
two zone valves to allow connection to an indirect storage cylinder.
There are two wiring diagrams shown, one for the connection to an
Unvented Cylinder (Diagram. A) and one for connection to an open
vented cylinder (Diagram B).
In both cases the boiler connection is shown as
ROOM
, which
relates to the terminal on the PCB for external controls (see 12 F
IG
.
31).
When connecting the boiler to an external cylinder do not run 240V
cables and the cables for the
ROOM
terminal (Fig. 38) together, use
separate cables to prevent induced voltage on the low voltage
switching circuit.
N
OTE
: T
HE USE OF A
‘Y’ P
LAN SYSTEM IS NOT POSSIBLE WITH THE
SYSTEM A
BOILER DUE TO THE LOW VOLTAGE SWITCHING OF THE
APPLIANCE
.
* I
MPORTANT
!!
E
NSURE THAT A BALANCING VALVE IS FITTED ON THE
CYLINDER RETURN AND BALANCED CORRECTLY AT
COMMISSIONING STAGE
.
*
Содержание Benchmark System A 24 RFF
Страница 18: ...18 1 2 A A Fig 13 Fig 15 Fig 12 11 Installing the Boiler continued Fig 14 P P ...
Страница 21: ...21 Fig 20 Fig 21 Fig 22 162 ...
Страница 30: ...30 WIRING DIAGRAM FOR CONNECTION TO AN OPEN VENTED CYLINDER DIAGRAM B ...
Страница 31: ...31 WIRING DIAGRAM FOR CONNECTION TO AN MTS UNVENTED CYLINDER DIAGRAM A ...
Страница 60: ...60 ...