Honeywell Sundial RF Pack 3 Wireless Enabled Programmer and Thermostats User Manual

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DT92E OPERATING INDICATORS
Low Battery Indicator / Battery Replacement
The battery symbol will start 
to flash if the battery power is 
running low. From this point, 
there will be a minimum of 4 
weeks before the product will 
cease to function.
Batteries are accessed by 
unclipping the front cover at the 
bottom. Note battery polarity. 
Reverse process to refit front 
cover.
Use 2xLR6 (AA) alkaline 
batteries only. 
Immediately on power up, DT92E will try to communicate and synchronise with...

22
DT92E ENERGY SAVING ECO FEATURE
The ECO button allows you to change to a lower, energy saving set temperature for 
a period of your choice, from 1 to 24 hours. This temperature is pre-set in the DT92E 
Installer Mode, but you can adjust this to any temperature you want when ECO mode 
has been activated. The default ECO temperature is 18°C.
At the end of the time period, the thermostat will return to its original set 
temperature.
Entering ECO Mode and Setting 
the Energy Saving Time Period
Press the...

23
DT92E ENERGY SAVING ECO FEATURE
FINE TUNING YOUR  DT92E
Changing the DT92E Installer Parameters
The DT92E has a special Installer Mode where some features can be adjusted to suit 
your lifestyle or preferences – these are called Installer Parameters, and are listed in 
the table below, along with a description of the options that are possible.
Your installer should set this up for you to suit your application (see \
CONFIGURATION 
& SERVICE DATA section). However, you may wish to alter some of the...

24
To Enter Installer Mode:
a. Hold the 
 button for 2 seconds until DT92E is in standby mode.
b. Hold 
 and  buttons for 3 seconds until the word ‘Inst’ appears on the 
display.
c.  Press the 
 button.
The first parameter is now ready to be changed.
To Select a Parameter:
Use the 
 and  buttons to move from one parameter 
to the next. Stop at the Parameter you wish to change.
To Change a Parameter:
Use the standby button to select the parameter value, then the 
 and  buttons to 
change the value....

25
OPERATING YOUR CS92A HOT WATER THERMOSTAT
Basic Operation
Your CS92A consists of a sensor element that 
is strapped to the metal surface of the hot 
water cylinder and a wireless transceiver box 
that is normally mounted on a wall surface 
apart from the cylinder. The transceiver 
communicates with the ST9420C programmer 
and regularly sends the hot water temperature 
measurement to it.
Battery Replacement
The CS92A batteries should last for a minimum of 2 years. Well before they run out, 
CS92A will...

26
BDR91T Controls Layout
Automatic Operation
The BDR91T relay box simply switches the boiler 
on and off according to a wireless signal it receives 
from the ST9420C. It is mainly used when the boiler 
is installed  in a remote location where it may be 
difficult to run wires direct from the timer. The green 
light indicates the status of the relay output:
Green light on = relay on
Green light off = relay off
Temporary Manual Override
In normal operation it should not be necessary to 
interact with the...

27
How do I set the time only, if the ST9420C clock is not correct?
Your ST9420C contains an accurate digital clock that is factory set. Should you ever 
need to change the time, just follow this procedure:
a. Move the slider to the DAY/TIME position.
b.  Keep pressing the green 
 button until the message ‘SET THE TIME’ is 
displayed. To change the time, press the   or  buttons until the correct 
time is shown. The message ‘IS TIME OK?’ will be displayed. Press the green  
button to confirm the time is...

28
How reliable is 2-way RF communication?
The 2-way RF communication (also known as wireless communication) used by 
Honeywell is extremely robust and reliable. When installed correctly the Signal 
Strength test feature allows the Installer to locate the system components where 
mutual signal reception is strong. During communication, signals are sent several 
times to ensure receipt, and if any message is garbled, the error detection software 
recognises this and ensures the message is repeated again....

29
Troubleshooting Guide
This is a quick guide to help you diagnose and cope with possible problems with 
your wireless control system. For further assistance, please contact your Installer.
SymptomPossible CauseRemedy
ST9420C has a blank LCD 
display No power to the 
heating system.Check that there is power to the 
heating system.
Fault in ST9420C
Call Installer
ST9420C indicates that 
Heating and/or Hot Water 
are ON, but radiators are 
cold and/or taps are running 
with cold water.
Temperature...

30
SymptomPossible CauseRemedy
The ST9420C screen shows 
the message: Your boiler service 
is overdue and 
the boiler has 
been automatically 
switched off to 
ensure your safety.Arrange an immediate boiler 
service.
If set to do so, it may be 
possible to obtain limited use 
of the boiler by pressing any 
EXTRA HOUR button. Each 
button press will allow operation 
of the boiler for 1 hour at a time, 
and the screen will display the 
message ‘On 1h’.
After servicing your boiler, the 
Service Engineer /...