Replacing Other Time Controls; Powering Up St9520C - Honeywell Y9520Z Sundial RF2 Pack 5 Installation Instructions Manual

1.6 Wiring Diagrams (cont.)
95-3 Wireless room thermostat, wired valves, wireless TPI boiler control
V4043H
2 PORT ZONE VALVE
ZONE 2
1 2
230V~
3 AMPS
50...60Hz
MAX
L
N
230V~
5 AMPS
50...60Hz
MAX
L
N
N L L
BDR91T

1.7 Replacing Other Time Controls

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

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.
V4043H
2 PORT ZONE VALVE
ZONE 1
3 4 5 6 7 8 9 10
N L 1 2 3 4 A B
ST9520C
*NOTE 2
A B C
A-B:5(3)A
A-C:5(3)A
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.
PUMP
L
N
E
PL T1 T2
L
N
BOILER
E
5