30
F
IG
. 39
F
IG
. 40
13. Electrical Connections
(continued)
13.2
Connecting Zone Valves (MINIMA HE System only)
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, page 30) and one for connection
to an open vented cylinder (Diagram B, page 31).
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
.
32, page 26
).
When connecting the boiler to an external cylinder do not run 240V
cables and the cables for the
ROOM
terminal (
12 Fig. 32, page 26
)
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
MINIMA HE S
YSTEM 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
.
*
Summary of Contents for Minima HE System 24 Nat
Page 19: ...19 1 2 A A Fig 14 Fig 16 Fig 13 11 Installing the Boiler continued Fig 15 P P ...
Page 22: ...22 Fig 21 Fig 22 Fig 23 ...
Page 31: ...31 WIRING DIAGRAM FOR CONNECTION TO AN OPEN VENTED CYLINDER DIAGRAM B ...
Page 32: ...32 WIRING DIAGRAM FOR CONNECTION TO AN MTS UNVENTED CYLINDER DIAGRAM A ...
Page 61: ...61 24 Benchmark Commissioning Checklist ...
Page 62: ...62 25 Service Interval Record ...
Page 63: ...63 ...
