St9420C Internal Wiring; Sundial Plan Wiring Diagrams (S, Y, C, W Plans) - Honeywell Y9420H Sundial RF2 Pack 2 Installation Instructions Manual

1.5 ST9420C Internal Wiring

OFF
Clock
N L 1 2 3 4
230V~
50...60Hz
N
3 AMPS MAX
L
HW OFF
1.6 Sundial Plan Wiring Diagrams
S-Plan
V4043H V4043H
2 PORT ZONE VALVE 2 PORT ZONE VALVE
HEATING HOT WATER
1 2 3 4
230V~
3 AMPS
50...60Hz
MAX
L
N
N L 1 2 3 4
*NOTE 2
C-Plan
DT92E
Wireless
Room
Thermostat
1 2 3 4
230V~
3 AMPS
50...60Hz
MAX
L
N
N L 1 2 3 4
*NOTE 2
ON OFF ON
CH OFF CH ON
HW ON
DT92E L641
Wireless CYL. STAT
Room
Thermostat
2 1
C
5 6 7 8 9 10
L
N
E
ST9420C
V4043H
2 PORT ZONE VALVE
L641
CYL. STAT
2 1
C
5 6 7 8 9 10
L
N
E
ST9420C
Notes
1. DT92E is completely wireless and so is not shown connected on
these wiring diagrams.
2. The ST9420C is a Class II (double insulated) device. A parking
terminal is provided for earth wiring continuity, if required.
3. In the Sundial S-Plan, W-Plan, and Y-Plan wiring diagrams,
connections are shown to basic boilers only. For wiring connections
to Pump over-run boilers refer to Boiler manufacturers' instructions
or to Honeywell Technical Help Desk for assistance.
4. It is recommended that gravity circulation hot water systems are
fitted with a suitable hot water control valve as shown in the Sundial
C-Plan system.
Y-Plan
1
PUMP 230V~
3 AMPS
50...60Hz
MAX
L
N
E N L
BOILER
W-Plan
Wiring shown as a hot water priority system
1
PUMP 230V~
3 AMPS
50...60Hz
MAX
L
N
E N L
BOILER
4
DT92E L641
Wireless CYL. STAT
Room
Thermostat
2 1
C
2 3 4 5 6 7 8
N L 1 2 3 4
ST9420C
*NOTE 2
DT92E L641
Wireless CYL. STAT
Room
Thermostat
2 1
C
2 3 4 5 6 7 8
N L 1 2 3 4
ST9420C
*NOTE 2
V4073
MID-POSITION VALVE
9 10
PUMP
L
N
E
E N L
BOILER
V4044
DIVERTING VALVE
9 10
PUMP
L
N
E
E N L
BOILER