Honeywell Y9420S, ST9420C, DT92E, CS92A, BDR91T User Manual

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User Guide

Y9420S Sundial RF2 Pack 3

How to use: ST9420C Wireless Enabled Programmer DT92E Wireless Room Thermostat CS92A Wireless Cylinder Thermostat BDR91T Wireless Enabled Relay Box (if installed)

System Components

Energy Efﬁciency and the Environment

Home energy use is responsible for more than ¼ of the total UK carbon emissions which contribute to climate change. Heating and hot water systems based on boilers account for of this ﬁgure, so it is important to understand how your controls can help to maximize energy efﬁciency while maintaining your comfort.

Your Programmer should be used in conjunction with appropriate temperature controls. In order to save energy the following general points should be observed:

1. Ensure your system contains a room thermostat and a hot water thermostat, and that both are set to appropriate temperature levels: typically 20°C for the room temperature and between 50 - 60°C for the hot water temperature.

Programme your heating and hot water to be off when you are not in the house. If you are concerned about possible frost damage to any exposed pipe work, it is advisable to ﬁt a frost protection system – your installer can advise you about this.

3. Think about how you use your domestic hot water – if you have a storage system, it is not necessary to have this switched on all the time, even when you are in the house.

4. Consider the heat up times required for your central heating. Every home responds differently when the heating is switched on. Adjust the start time so that you are not cold when you get up in the morning. A shorter heat up time is required for other heating periods.

5. In the evening, when the house is up to temperature, it is often possible to switch off the heating up to an hour before you go to bed, without any noticeable reduction in comfort.

This document is to be left with the user

and forms part of a Home Information Pack

This section is to be completed by the Installer

Honeywell Control Systems Ltd.

Arlington Business Park, Bracknell Berkshire RG12 1EB

Technical Help Desk: 08457 678999 www.honeywelluk.com

50047645-008 A

PLEASE RESPECT YOUR ENVIRONMENT! Take care to dispose of this product and any packaging or literature in an appropriate way

WHAT IS A PROGRAMMER?

...an Explanation for Householders (as recommended by the Energy Savings Trust)

Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central heating and domestic hot water on and off at the same time, while others allow the domestic hot water and heating to come on and go off at different times. Set the ‘On’ and ‘Off’ time periods to suit your own lifestyle. On some programmers you must also set whether you want the heating and hot water to run continuously, run under the chosen ‘On’ and ‘Off’ heating periods, or be permanently off. The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time. You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’, or ‘Boost’. These are explained in the manufacturer’s instructions. The heating will not work if the room thermostat has switched the heating off. And, if you have a hotwater cylinder, the water heating will not work if the cylinder thermostat detects that the hot water has reached the correct temperature.

WHAT IS A ROOM THERMOSTAT?

...an explanation for Householders (as recommended by the Energy Savings Trust)

A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. Turning a room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators. Neither does the setting affect how quickly the room cools down. Turning a room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy. The heating system will not work if a time switch or programmer has switched it off. The way to set and use your room thermostat is to ﬁnd the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18ºC – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

Room thermostats need a free ﬂow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric ﬁres, televisions, wall or table lamps may prevent the thermostat from working properly.

Location

ST9420C

DT92E

(typically in living room or hallway)

CS92A

(typically next to hot water tank, in bedroom)

BDR91T

(If installed, typically next to boiler)

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HOT WATER HEATING

EXTRA HOUR

OVERRIDE

EXTRA HOUR

OVERRIDE

NEXT DAY

COPY DAY

HOLIDAY

DAY/TIME

HOT WATER

HEATING

RUN

Hot Water ‘ON’ period indicator

Time Display

LoT™ Technology Display

Programme Time Markers

Day of Week Indicator

RF Symbol

Heating ‘ON’ period indicator

Heating Extra Hour Button

Heating Indicator Lamp

Heating Override Button

Boiler Status Indicator

Slider

ECO Mode Active

Frost Protect Indicator

ECO Countdown Indicator

Heating Demand Indicator

Setpoint Change Buttons

ECO Button

OFF/Standby Button

OFF/Standby Indicator

RF Communications Indicator

Battery Low Indicator

Fault Indicator

Setpoint Indicator

Temperature Display

Sensor element Transceiver

Heating Operating Mode Indicator

Heating Operating Mode Button

OK/Next Button

Clock – and + Buttons

Hot Water Operating Mode Button

Hot Water Operating Mode Indicator

Holiday Button

Copy Day Button

Next Day Button

Hot Water Override Button

Hot Water Indicator Lamp

Hot Water Extra Hour Button

1 2 3 54 6 7

151214 131718

Keep this document in a Home Information Pack

1 2 3 4

CS92A CONTROLS LAYOUT

DT92E CONTROLS LAYOUTST9420C CONTROLS LAYOUT

ST9420C

This product and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc. and its subsidiaries and existing under the laws of the UK and other countries. These intellectual and property rights may include patent applications, registered designs, unregistered designs, registered trade marks, unregistered trade marks and copyrights.

Honeywell reserves the right to modify this document, product and functionality without notice. This document replaces any previously issued instructions and is only applicable to the product(s) described.

This product has been designed for applications as described within this document. For use outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be held responsible for misapplication of the product(s) described within this document.

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised Representative Honeywell Inc.

CONFIGURATION & SERVICE DATA

Boiler & System Service Log

The space below can be used to provide a record of boiler & system services and the names and contact numbers of the Installer and Service Personnel.

This information is important for a Home Information Pack.

Service/Installation Date

Installation/Service Engineer

Telephone Number / Contact Details

Conﬁgurable Features Options Factory

setting

Installer conﬁgured (note value)

DT92E Conﬁguration

Measurement offset -3.0°C to 0 to 3.0°C 0 Upper setpoint limit 21 to 35°C 35°C Lower setpoint limit 5 to 21°C 5°C Energy saving ECO setpoint 5 to 35°C 18°C

Green light (under button)

Button

Red light (under button)

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Contents

CONTROL OF YOUR SYSTEM

General Description of Controls in Your System ................................................... 4

The way to use a Programmer ..............................................................................4

The way to use a Room Thermostat / Control of Your Boiler / Optimisation .........5

GETTING STARTED WITH YOUR ST9420C

Step 1: Setting the Date & Time............................................................................6

Step 2: Running a Built-in Programme .................................................................7

PROGRAMMING YOUR ST9420C

The Built-in Programmes / Your Personal Programme ..........................................8

Reviewing the Programme Times / Modifying the Hot Water Programme ............9

Modifying the Heating Programme / Disabling or Enabling Time Periods .........11

OPERATING YOUR ST9420C

Choosing the Operating Mode ...........................................................................12

Overriding the Operation Without Changing the Programmes ...........................12

The Extra Hour Function / The Holiday Function ................................................13

Enquiry Mode .....................................................................................................14

FINE TUNING YOUR ST9420C

Changing from AM/PM Time Display to the 24 Hour Clock ................................15

Changing the Installer Parameters .....................................................................15

Optimisation ........................................................................................................17

How to set your Hot Water Set Temperature .......................................................18

BOILER SERVICE REMINDER

Countdown to Service / When Service is Due ....................................................18

Shut-down ...........................................................................................................19

OPERATING YOUR DT92E

Inquiring about the Set Temperature / Adjusting the Set Temperature ...............19

Switching Off / Display Updates / Heating Indicator / Frost Protection ..............20

DT92E OPERATING INDICATORS

Low Battery Indicator / Battery Replacement / RF Communications Indicator / Lockout

...21

DT92E ENERGY SAVING ECO FEATURE

Entering ECO Mode and Setting the Energy Saving Time Period ......................22

What Happens in ECO Mode? ............................................................................22

How to Exit ECO Mode .......................................................................................23

FINE TUNING YOUR DT92E

Changing the DT92E Installer Parameters .........................................................23

OPERATING YOUR CS92A HOT WATER THERMOSTAT

Basic Operation / Battery Replacement / Error Indications ................................ 25

OPERATING YOUR BDR91T RELAY BOX (IF INSTALLED)

BDR91T Controls Layout / Automatic Operation ................................................26

Temporary Manual Override / Loss of Wireless Communications ......................26

FAQ AND TROUBLESHOOTING

Frequently Asked Questions ...............................................................................27

Troubleshooting Guide........................................................................................29

CONFIGURATION & SERVICE DATA

Conﬁguration Data (to be completed by Installer) .............................................34

Boiler & System Service Log ..............................................................................35

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General Description of Controls in Your System

Your Honeywell ST9420C provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle.

The ST9420C does not directly control the temperature but works together with other temperature controls, such as room thermostats and cylinder thermostats or sensors, to control your heating and hot water system in your home.

With 7-day programming and up to 3 on/off periods per day, every day can be set differently, and heating and hot water can be set at different times from each other.

ST9420C also has a Boiler Service reminder / Shut-down feature, which helps ensure your gas boiler is regularly serviced in compliance with UK Gas Safety Regulations. For more details see pages 18 & 19.

Your system includes a DT92E wireless room thermostat and may include a BDR91T Relay Box to switch your boiler remotely. These products use state of the art 2 way RF communications to share information and give you robust and ﬂexible control of your indoor environment.

The following instructions explain how to programme and use the ST9420C, and associated controls, to provide the most home comfort at the least cost.

The way to use a Programmer

Think about the time periods when you are typically in the house and when you are not, and also the times when you use a lot of hot water. These are the times you should use as the basis for the programmes. It will be necessary to allow some heat up time for the heating system after periods when it has been off – this would typically be 1 - 1½ hours, depending on your house and your preferences.

If Optimum Start has been selected (see page 17), you do not have to allow for this heat up time as the Programmer is intelligent and will calculate the correct starting time for your house. This is based on measurements it makes about your system characteristics, and on the current and target room temperatures. All you have to do is programme the time periods when you want to be comfortable.

Other features are commonly available on the Programmer to enhance comfort and convenience, for example, OVERRIDE, EXTRA HOUR, and MODE buttons.

A typical use of the OVERRIDE feature is when you return home unexpectedly for the rest of the day and the heating is off. Just press the heating OVERRIDE button and the heating will come on until the next programme time, at which point it will follow the normal programme. The advantage here is that you do not have to remember to switch off because the normal time programme does this for you.

CONTROL OF YOUR SYSTEM

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A typical use of the EXTRA HOUR button would be if you returned to the house for a short period when the heating and hot water were off. Pressing the appropriate EXTRA HOUR button gives you 1, 2, or 3 hours of heating, exactly when you need it. Another typical use is when the heating is already on and you want it to stay on a little longer - just press EXTRA HOUR and, for that day only, an hour will be added to the end of the time at which heating normally goes off.

The MODE buttons allow you to select how you want to operate heating and hot water independently. The most obvious use is to switch heating OFF during the summer months, but you may also use this feature if you take a mid-week day off work, you can then set the MODE to ONCE to keep the system ON during the day from the ﬁrst programmed ON time till the last programmed OFF time.

The way to use a Room Thermostat

The way to set and use your room thermostat is to ﬁnd the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18°C – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

DT92E has a green ECO button, which enables you to set a period of time at a lower temperature. This energy saving feature is most useful if you are out of the house for a few hours, or if you want a reduced temperature for a while and don’t want to have to remember to turn the temperature back up (see pages 22 & 23 for details).

Control of Your Boiler

There are two ways your boiler may be controlled. It may be switched directly using the ST9420C timer, or, if installed in a remote location, it may be switched using a BDR91T relay box.

In each situation the operation of the boiler is determined automatically by the combination of inputs from the room thermostat and the timer, and in such a way as to maintain your comfort with minimal energy use. The timer will indicate the on/off status of the boiler by showing the ﬂame symbol

Optimisation (see page 17 for explanatory diagrams)

Your control system has some features called Optimisation, which aim to save energy while making you as comfortable as possible. These may or may not be enabled – check page 34 where your Installer should have indicated how these were set. Optimisation does not apply to your Hot Water, only to your Heating.

Optimum Start works by measuring how quickly your system normally heats up, and

CONTROL OF YOUR SYSTEM

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Your ST9420C should have been set up to work correctly when it was installed. However, the following will show you how you can modify your settings to meet your particular lifestyle.

To assist you with programming and everyday use your ST9420C will display text messages at every stage to help you get the most out of your central heating and hot water system. The ST9420C uses LoT™ Technology to constantly update the display to give you feedback about what is required.

Step 1: Setting the Date & Time

Your ST9420C had the date and time set at the factory, and these are normally maintained by a backup battery in the event of power failures. If you wish to change the date or time, or if the LoT™ Display shows the message ‘SET DATE + TIME’ just follow the instructions below. Otherwise, go to Step 2.

a. Move the slider to the DAY/TIME position. The message ‘SET DATE + TIME’ will

show brieﬂy on the screen, followed by ‘SET THE DAY’, and the day of the month will now be ﬂashing to indicate it can be changed.

GETTING STARTED WITH YOUR ST9420C

HOT WATER HEATING

DAY/TIME

HOT WATER

HEATING

RUN

using this to calculate the correct time to switch on to reach your comfort temperature, when you want it. So the times you set are when you want the heating to be at

the correct temperature, and the system adjusts the starting time to meet this.

Delayed Start is an alternative to Optimum Start. It works by using your normal

programmed start times, compares the actual temperature with the set temperature, and delays the start a little depending on how close these temperatures are to each other.

Optimum Stop saves energy, and money, by switching off a little earlier than the normal programme time. If the house is up to temperature, you will not notice the effect on the temperature, but you will see a difference in your fuel bill.

The radiator symbol on ST9420C will ﬂash to let you know whenever Optimisation is operating.

The other controls in your system should not require adjustment.

CONTROL OF YOUR SYSTEM

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GETTING STARTED WITH YOUR ST9420C

b. To change the day of the month, press the or buttons until the correct

day is shown. Each press of the button will change the date by one day. As soon as a change has been made, the message ‘IS DAY OK?’ will be displayed. Once the correct day is reached, press the green button to conﬁrm, and move to the next step. If you do not need to make a change, just press the button immediately and this will move you to the next step.

c. The month digits will now be ﬂashing and ‘SET THE MONTH’ will be displayed. To

change the month, press the

or buttons until the correct month is shown. The message ‘IS MONTH OK?’ will be displayed. Press the green button to conﬁrm the month is correct and move to the next step.

d. The year digits will now be ﬂashing and ‘SET THE YEAR’ will be displayed. To

change the year, press the

or buttons until the correct year is shown. The message ‘IS YEAR OK?’ will be displayed. Press the green button to conﬁrm the year is correct. If you have made a change and the date is a valid date, the message ‘DATE SAVED’ will show, and you can move to the next step. If the date you set was not valid, for example 31 September, the message ‘INVALID’ will show and you will be returned to the start of the date setting operation.

e. The time will now be ﬂashing and the message ‘SET THE TIME’ will be displayed.

To change the time, press the

or buttons until the correct time is shown. Each press of the button will change the time by one minute. Holding the button down for more than a few seconds will change the time slowly at ﬁrst, then quickly. The message ‘IS TIME OK?’ will be displayed. Press the green button to conﬁrm the time is correct. If you have made a change, the message ‘TIME SAVED’ will show, followed quickly by ‘DATE + TIME COMPLETE’.

f. Move the slider to the RUN position to complete setting the date and time.

Note: if the slider is moved at any time before the date and time have been set correctly, the message ‘DATE UNCHANGED’ will be displayed brieﬂy, and your changes will not be saved.

Step 2: Running a Built-in Programme

With the date and time correct, your ST9420C Programmer will now be operating to the built-in programmes. These have been designed to provide heating and hot water at typical times throughout the day, but if you want to customise the settings, please see the next section ‘PROGRAMMING YOUR ST9420C’ (page 8).

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PROGRAMMING YOUR ST9420C

The Built-in Programmes

The built-in programmes give you a starting point that you can personalise to your own requirements. Your Installer should have selected one and ticked the box alongside it. If there is no tick, the product normally leaves the factory with Proﬁle A installed, but it is a simple matter to select one of the other proﬁles (see Changing the Installer Parameters, page 15).

Built-in Programme (Proﬁle A)

ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3 Monday to Friday

Heating

6:30am 8:30am 12:00pm 1:00pm 4:30pm 10:30pm

Hot Water

6:30am 8:30am 12:00pm 1:00pm 4:30pm 10:30pm

Saturday & Sunday

Heating