
Fully Pumped Heating System using RT021 room
stat, cylinder stat and Three Port Mid Position Valve
with a HP021/HP027 electronic programmer.
This diagram is schematic and should be used for
guidance only.
17
1
2
3
4
5
6
L
N
MAINS
SUPPLY
E
N
L
1
4
1
4
FROST
STAT IF
FITTED
RT021
ROOM
STAT
CYL
STAT
W
BL
0
GR
MRG POSITION VALVE
PUMP &
BOILER
L
N
Содержание RT021
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