Honeywell Y9420H Sundial RF2 Pack 2 Installation Instructions

1
Y9420H Sundial RF
²
Pack 2
INSTALLATION INSTRUCTIONS
50047644-003 A
System Operation
DT92E and ST9420C both use 2-way communication on an 868MHz
radio frequency (RF) band to control the heating and stored hot water
system.
ST9420C operates as the control hub of the system, and DT92E is free to
be positioned anywhere in the living space.
This functionality is ideal for upgrading existing systems without a room
thermostat to ensure compliance with Building Regulations. It is also
ideal for new or refurbished systems, where running mains cable from
the programmer to the thermostat and back to the boiler is difficult or
impractical.
2-way wireless
communication
Honeywell
L641A
Cylinder
Vent
Boiler
V4043H
V4043H
Pump
Junction
Box
Radiator(s)
Cold
Feed
DT92EST9420C
L641A
V4073H
DT92EST9420C
Cylinder
Vent
Boiler
Pump
Junction
Box
Radiator(s)
Cold
Feed
L641A
V4044C
DT92EST9420C
Cylinder
Vent
Boiler
Pump
Junction
Box
Radiator(s)
Cold
Feed
L641A
V4043H
DT92EST9420C
Cylinder
Vent
Boiler
Pump
Junction
Box
Radiator(s)
Cold
Feed
S-plan - Best practice, expandable
C-plan - Not for new installations
Y-plan - OK for new installations
W-plan - Not for new installations
Sundial RF
²
is a registered trademark of Honeywell Inc.
Application
This pack provides a wireless control solution for adding a wireless room
thermostat to an existing Sundial system with wired cylinder thermostat.
Pack contents & Product Descriptions
1 x ST9420C1008 Wireless enabled 7 day programmer with 2 output
control relays for switching boilers, pumps and zone
valves in heating systems. It requires permanent
mains 230Vac power.
1 x DTS92E1020 Wireless digital room thermostat with energy
saving ECO function. It operates on 2xAA alkaline
batteries, giving a battery life of at least 2 years
under typical operating conditions.
1 x table stand for DT92E (optional)
Other Honeywell products may be required for a complete installation.
See Schematic System Layouts (below) or refer to www.honeywelluk.com
for full details.
Schematic System Layouts

Honeywell Y9420H Sundial RF2 Pack 2 Specifications

General

Brand	Honeywell
Model	Y9420H Sundial RF2 Pack 2
Category	Thermostat
Language	English