S
U
N
D
IA
L
S
Y
S
T
E
M
S
2.5
Y PLAN
SUNDIAL Y PLAN
FEATURES
■
Independent control of
heating zone
■
Independent control of domestic
hot water temperature
■
Pump & boiler switched off when space
and hot water temperature requirements
are satisfied
■
Both systems can operate at
the same time
OPTIONS
■
Programmable thermostat in
heating zone to provide
‘Best Practice’ system
■
Radiator thermostats may be fitted
to provide temperature control
in selected rooms/areas
■
CM Zone can provide wireless boiler
interlock for individual radiator control
APPLICATION
The Sundial Y Plan is designed to provide independent
temperature control of both heating and domestic hot water
circuits in fully pumped central heating installations.
Sundial Y Plan satisfies the minimum standard requirements
of the Building Regulations Part L1 when used in conjunction
with radiator thermostats and an automatic bypass valve.
For systems in dwellings with a floor area greater than 150m
2
,
Sundial S Plan Plus must be used (see 2.3).
T6360
ROOM
THERMOSTAT
V4073
3 PORT
MID
POSITION
VALVE
L641
CYLINDER
THERMOSTAT
TIMER
© Honeywell Control Products and Systems, Issue 10
0014_Section 2_dft10_v1.qxd:Section 2_dft9
15/10/07 15:55 Page 11
