ST699 ELECTRONIC DUAL ZONE TIMER
3
EN0R 8439 R0
ROOM
THERMOSTAT
BOILER
PUMP
CLOCK
ST699
FUSE
WIRING
Cable entries can be made through the opening in the rear of
the subbase, or via the three surface entry break-outs in the
top and two sides of the wallplate. See fig. 2
The ST699 is designed for fixed wiring only and must be
wired in accordance with the latest IEE wiring regulations.
Ensure the wiring connections to the mains supply is via a
fuse rated at not more than 3 A and a Class "A" switch
(having contact separation of at least 3 mm in all poles).
Remove the terminal cover to allow access to the wiring
terminals as shown in fig.2. Connect the systems wiring as
shown by the specific applications wiring diagram. A
maximum of two 2.5 mm
2
(cross sectional area) wires can be
connected to each terminal as shown in fig.3. Each wire
should be stripped of insulation to a length no greater than
7mm to safeguard against the possibility of electrical shorts.
Fig. 2
*A link must be provided between L-5-8 on the subbase of
ST699 for all Sundial Plans, or fully controlled pumped
primary systems
Fig. 3
Basic System 3 - as System 2 except boiler cycling
controlled by room thermostat when DHW is switched
OFF
Systems Wiring
DHW OFF
DHW ON
CLOCK
Basic Wiring
CH OFF
CH ON
ST699
CLOCK
Basic System 1 - without thermostats
BOILER
PUMP
ST699
CLOCK
ROOM
THERMOSTAT
BOILER
PUMP
Basic System 2 - with room thermostat
ST699
