5
95-3 Wireless room thermostat, wired valves, wireless TPI boiler control
Check the unit powers up correctly and that the display does not remain blank.
ST9520C must be powered up before the DT92E thermostats are installed, so that the signal strength tests can be conducted.
The initial signal strength test will verify that both units have each others addresses in their memory, and can therefore communicate. The process of
writing respective addresses into memory is called BINDING.
ST9520C is supplied with its own wiring back-plate. As this is for new or upgraded installations it is recommended this is used, and it MUST be used
for OpenTherm applications (95-3).
ST9520C may mount on the back-plate of existing time controls, but it is likely major wiring changes will be required for compatibility with the plumbing
and controls changes. Refer to the Honeywell Technical Help Desk for advice.
1.8 Powering Up ST9520C
1.7 Replacing Other Time Controls
1.6 Wiring Diagrams (cont.)
Additional notes
a.
Orange wires from zone valves are ‘parked’ for
convenience.
b.
Pump live is taken from boiler. If pump is located next
to zone valves, take the pump N and E from the 10-way
junction box (terminals 2 & 3 respectively) and the pump
switched Live from terminal 10.
V4043H
2 PORT ZONE VALVE
ZONE 2
BLUE G/YELLO
W
BR
OWN
ORANGE
GREY
V4043H
2 PORT ZONE VALVE
ZONE 1
BLUE G/YELLO
W
BR
OWN
ORANGE
GREY
3 AMPS
MAX
5 AMPS
MAX
L
N
L
N
230V~
50...60Hz
230V~
50...60Hz
BOILER
PUMP
L
N
E
ST9520C
BDR91T
*NOTE 2
N L 1 2 3 4
N L L
A B
T1 T2
PL
L
N
E
1 2 3 4 5 6 7 8 9 10
A-B:5(3)A
A-C:5(3)A
A B C
