The following keywords are defined and can be used in this document:
Important information
This symbol indicates important information where there is no risk to people or property
Additional symbols
Symbol | Explanation |
▶ | Step in an action sequence |
à | Cross-reference to another part of the document |
• | List entry |
– | List entry (second level) |
Abbreviations
CH | = | Central Heating |
DHW | = | Domestic Hot Water |
RF | = | Radio Frequency |
DST | = | Daylight Savings Time |
BST | = | British Summer Time |
GMT | = | Greenwich mean time |
RPB | = | Rotary Push Button |
Definitions (DST/BST)
Daylight Saving Time (DST) and British Summer Time (BST) begin on the last Sunday in March at 1:00 am GMT and clocks are put forward by one hour. British Summer Time (BST) ends on the last Sunday in October at 2:00 am BST and the clocks are put back by one hour.
General safety instructions
These installation instructions are intended for heating engineers and electricians.
Appliance operation
This appliance can be used by children aged 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning the use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision. (BS EN 60335-1 2012)
Installation, commissioning, and servicing
Installation, commissioning, and servicing must only be carried out by a competent engineer.
Electrical work
Electrical work must only be carried out by a qualified electrician.
Handover to the user
When handing over, instruct the user on how to operate the heating system and inform him about its operating conditions.
The Comfort II RF comprises a wall-mounted twin-channel RF programmable room thermostat and a boiler or wall-mounted RF receiver.
Programmable room thermostat
The wall-mounted unit is a twin-channel RF Programmable room thermostat. The Programmable room thermostat is for central heating and hot water control with modulating/enhanced load-compensating boiler regulation. Up to six time and temperature periods can be set to control central heating as well as up to three ON and Off times to control hot water. This enhance load-compensating function enables an intelligent conversation with the boiler to achieve the desired room temperature in the most efficient way possible. To help save the customer money by burning less fuel, and to minimize room temperature “overshoot” the boiler’s burner may stop firing just prior to the desired room temperature being reached. This behavior including reduced radiator temperature is perfectly normal. The customer should simply set a temperature on the thermostat that they are comfortable with and allow the room thermostat and boiler to do their work. All programming and adjustment is conveniently done from the Programmable room thermostat making the Comfort II RF an excellent solution if your boiler is not easily accessible. The unit has user and installer menus to allow the setting of the temperatures, time programs, monitoring of system information, setting current time/date, daylight savings, maintenance schedules, and pairing the device with the Receiver
1 | Display | Temperature, time, date, CH and HW program selection, fault codes, menu symbols and operational symbols |
2 | Hot water program selection | ON, OFF, AUTO, ONCE, NA (NA displayed on additional Room stats in multiple CH zone applications) |
3 | Hot water (HW) program advance button/user menu selection button | Only functional in AUTO mode. Pressed once, advances the timer to the next programmed ON or OFF time, pressed again, returns to the current program. Hold the button down for more than 3 seconds to enter the user menu program |
4 | Rotary push button knob | Turn or press to select or confirm settings |
5 | Central heating program advance button / Return button | Only functional in AUTO mode. Pressed once, advances the timer to the next programmed ON or OFF time, pressed again, returns to the current program. When in the menu functions this button returns to next higher level |
6 | Central heating program selection | ON, OFF, AUTO |
Receiver
This unit is only used in conjunction with the Programmable room thermostat. The unit can be mounted in the boiler fascia, refer to your boiler Installation, Commissioning and Servicing instruction manual for fitting instructions. The unit can also be wall mounted and hard-wired to the boiler via the EMS BUS connections.
Refer to the boiler’s Installation, Commissioning and Servicing instruction manual for information on the boiler. Refer to this manual for detailed information on installing and using the Comfort II RF. A brief overview of the Comfort II RF installation procedure is listed below:
The Comfort II RF Programmable room thermostat consists of two units: the Receiver that mounts into the boiler fascia or, with an optional wall mounting kit, onto the wall and the Programmable room thermostat which mounts on a wall in a suitable reference room
Receiver mounting
There are two methods of mounting the Receiver:
If your boiler is mounted remotely i.e. in the loft or an outbuilding, you may want the Receiver to be conveniently located for easy access
Boiler fascia mounted
Refer to your boiler’s Installation, Commissioning and Serving instruction manual for mounting the Receiver into the boiler fascia.
Wall mounted
Choose a convenient wall location, approximately 1.2 meters from the floor, to mount the Timer. The Receiver is a radio frequency (RF) device and as such is flexible for positioning.
Run a two-core cable from the boiler to the Receiver location. Use an electrical cable with a minimum rating of H05VV-F. For cable runs up to:
Connect the cable to the EMS bus point connections on the boiler control circuit board, refer to the Installation, Commissioning and Servicing instruction manual for your boiler to locate the EMS connections.
Optional wall mounting kit
Using the wall plate as a template, mark the position of the mounting screws. The optional wall mounting kit contains:
Programmable room thermostat mounting
Before mounting the Room thermostat wall plate, fit batteries in the Room thermostat unit and turn the boiler on to identify a location that offers a good RF signal.
Fitting the batteries
Room Thermostat positioning
Before mounting the room Programmable room thermostat on the wall, it is good practice to find a position that affords good signal strength.
Signal strength
0 | = | no signal |
1 – 3 | = | weak signal |
4 – 6 | = | acceptable signal |
7 – 10 | = | very good signal |
Wall mounting plate
To remove the wall mounting plate:
The Programmable room thermostat is a radio frequency device and as such is flexible for positioning, there is no requirement to hard wire the device. The thermostat requires free air flow and should be mounted in an open area and not obscured by curtains or furniture. The thermostat should be mounted no closer than 300mm to metal objects, including metal wall boxes. Mount the thermostat on a wall that is not subject to direct sunlight or draughts, preferably on an inside wall at 1.2 meters above the floor. The thermostat must not be directly influenced by radiators or other appliances giving off heat, such as televisions or lamps
Using the wall plate as a template, mark the position of the mounting screws. The wall mounting kit provided with the Programmable room thermostat contains:
Date and time set up
The Programmable room thermostat is supplied with factory-set default CH times and temperature periods and DHW ON and OFF times that are shown in the table below. These settings can be reset according to the homeowner’s requirements via the User menu function on the Programmable room thermostat, section 5.1. The times and temperatures can be reset to the factory setting via the User menu section 5.1.5. Settings – Reset all.
06:30 | 08:30 | 16:30 | 22:30 | |
CH | 1st | 2nd | 3rd | 4th |
CH TEMP | 20 °C | 16 °C | 21 °C | 10 °C |
DHW | ON | OFF | ON | OFF |
Normal operation
During normal operation the display shows:
Low battery
A battery symbol indicates the batteries require replacing, refer to section 9.1
Burner ON indicator
The symbol is shown when the boiler is firing and heating up, there can be up to a six-minute delay between the boiler indication and the programmer display
Low RF signal strength
The A21 fault code indicates no RF signal, refer to section 5.2 Installer/Radio settings and section 6.2 Pairing/ Unpairing. 5.2.6
Programmable room thermostat
During normal operation the display shows:
Graphical indication of the current time/temperature settings, the black markers indicate half hour time periods, and the height of the markers gives an approximation of the temperature setting. The flashing black marker indicates the current time position in the programmed sequence.
Room temperature indication in Auto mode
When the Programmable room thermostat is in Auto mode, pressing the knob once and releasing will display the current desired room temperature setting, and also when the next temperature increase time is scheduled. The example shown below indicates that the room temperature is 15 °C until 16:30 (4:30pm).
Room temperature indication in the On mode
When the Programmable room thermostat is in the On mode, pressing the knob once and releasing will display “Permanently” and the temperature that is permanently set.
Room temperature indication in the Off mode
When the Programmable room thermostat is in the Off mode, pressing the knob once and releasing will display “Permanently”and the temperature of 5 °C. After three seconds the display will revert back to show the actual room temperature and also the frost symbol indicating that if the room temperature goes below 5 °C the boiler will come on and maintain that temperature to prevent freezing.
Setting a new room temperature
Under normal operation the display shows the current room temperature. When the Auto or On mode, turn the knob anti-clockwise to decrease the temperature or clockwise to increase. The new temperature setting will flash for three seconds. The display will briefly show the new temperature up to the next time period change.
There are two levels of settings:
User
Press the menu button for more than three seconds to enter the User setting area of the Timer/programmer. Five icons are shown across the top of the display:
Heating
The top line of the display shows the words Time programs plus flashing arrow heads at each end, this indicates that there are more programs available:
Time programs
Select Time programs with the knob, and press to enter
Press the Return button
Whether you choose to set the same times for Monday to Friday and different times for Saturday and Sunday or set times for individual days the setting operation is the same.
If after setting the time periods 5 and 6 you decide that you no longer require it and wish to disable it, follow these steps:
HW
The top line of the display shows the words Time programs plus flashing arrow heads at each end, this indicates that there are more programs:
This Time program is used to set your required ON and OFF times for the hot water. The Programmer has default time settings as shown below:
06:30 | 08:30 | 16:30 | 22:30 | |
DHW | ON | OFF | ON | OFF |
Time programs
Select DHW programs with the knob, and press to enter. In the DHW program you can select ON and OFF times for the hot water heating, there are three ON and three OFF programs. Using the knob you can select various combinations of days or individual days:
Whether you choose to set the same times for Monday to Friday and different times for Saturday and Sunday or set times forindividual days the setting operation is the same.
Information
If the third DHW period is not required repeatedly press the knob to cycle through the third period without making any settings
Holiday function
When the Holiday function is set, via this program, the function will become active at midnight of the day set and inactive at midnight on the last day set. During the holiday period the hot water and CH functions are off and will return to normal operation at the end of the holiday period. The Frost symbol is displayed, indicating that the boiler is OFF but is protected when the temperature falls below 5 °C.
To cancel the holiday function:
Info
Turn the knob to select Info and press the knob, two menus are available:
DHW
Signal strength
Turn the knob to select Signal strength and press the knob to enter the function. The signal strength is displayed as a number from 0 to 10 in the area where the temperature is normally displayed
0 | = | no signal |
1 – 3 | = | weak signal |
4 – 6 | = | acceptable signal |
7 – 10 | = | very good signal |
Setting
Language
This function allows you to choose the language used by the Programmer, by default is set to English (EN).
Time/Date
This function allows the current time and date to be set, this would be used on initial set up of the Programmer or if the time and date were lost due to the boiler being switched off for an extended period of time. Turn the knob to select Time/date and press to enter the function:
Format
Press the knob to enter the format function and the following sub menus are available:
Date format
This function allows you to change the way the date is displayed, by default the format is DD.MM.YYYY. Once the date and time have been set the date format can be set:
Time format
If it is suspected that the temperature display is off by a few degrees and if there is a precision temperature gauge/meter available, the display can be offset by ± 5 °C to compensate.
The default value is 0.0 °C.
Contrast
Reset all
Dashes progress across the screen until four are displayed briefly, then the display reverts to just showing Reset all The Programmable room thermostat will be reset to factory default settings, as shown in the table below, any customised times for heating or hot water will have to be re-entered.
06:30 | 08:30 | 16:30 | 22:30 | |
CH | 1st | 2nd | 3rd | 4th |
CH TEMP | 20 °C | 16 °C | 21 °C | 10 °C |
DHW | ON | OFF | ON | OFF |
These functions are only used by the installer/service engineer and are useful during both installation of the Comfort II RF to make adjustment to suit the heating system; during an annual service/inspection, or to assist with fault finding. Press the menu button and return button for more than three seconds to enter the Installer setting area of the programmer.Six icons are shown across the top of the display:
Selections 1 to 5 are the same as the Timer / programmer user menu, section 5.1. Turn the knob to select the Installer icon
Installer settings menu options
The menu options are displayed on the top line with flashing left and right arrows heads, indicating that there are other menu options available. Turning the knob will select each option in turn, eventually returning to the first option.
System data
Reset all
The Programmer Installer menus will be reset to factory default settings, any default settings are described at the beginning of the functional descriptions.
Heat circuit
This function allows the Installer/Service engineer to set the maximum flow temperature for the central heating circuit to potentially increase the efficiency of the heating system, the default value is 85 °C.
Fault history
History
Turn the knob to select Landlord func. or press the Return button
Call the Worcester Bosch technical support team for instructions of how to set the Maintenance message or contact telephone number
This function is for social housing landlords only and enables a maintenance/annual service date to be set. The maintenance reminder message “Maintenance” is displayed 30 days before the set date. Along with the Maintenance message a contact telephone number will also be displayed. The tenant should call this number to arrange a convenient date with the landlord for the service. If the maintenance reminder message is not cleared or reset to a later date, by the service engineer, then 14 days after the scheduled maintenance date the controller will limit the room temperature set point to 18°C.
System info
Radio settings – Pair/Unpair
Key lock
When the Key lock is active, no user interaction with the units is possible, if a button is pressed or the knob turned/pressed the word Key lock is displayed.
To activate the Keylock:
Hold down the CH Select button and the knob at the same time for more than three seconds and the Keylock is active
To de-activate the Key lock:
Hold down the CH Select button and knob at the same time for more than 3 seconds and the Key lock is de-activated
Receiver
The Receiver is paired with the Programmable room thermostat and they communicate via an RF signal. The Receiver unit has an Override/Pairing push button and a LED to indicate various sates of operation.
Override push button
Green indicator LED | Indicates the status: | |
Normal operation | OFF | No central heating zone is calling for heat |
ON | One or more zones calling for heat | |
Manual override | Flashing off, for ¼ second over a 2 second period | Manual override is active |
Pairing modes | 2 x ¼ second flashes over 5 a sec. period | Pairing in operation |
5 x ¼ second flashes over 5 a sec. period | Unpairing in operation | |
Push button | Press for >5 seconds for pairing Press for >10 sec. for unpairing | Pairing or unpairing the Receiver with the Programmable room thermostat(s) |
Press once, briefly, for override, press again for no override | Manually switching the boiler ON or OFF |
Fault table
Fault code Problem Description Resolution | |||
The temperature displayed on the thermostat unit is different than the room temperature | The temperature offset setting is other than 0 | Check the temperature offset setting on the Programmable thermostat (Setting menu à Format à Sensor calib. refer to section 5.1.5) and adjust as required. | |
Room-to-room temperature difference | Consider differences between rooms due to draughts, sunshine, etc. Move the Room thermostat to a more suitable location if necessary. | ||
The required room temperature has not been achieved | Airlock | Bleed the radiators and vent the heating system. | |
Low system pressure | Top up the system pressure via the filling link. | ||
Time program/weather change | Is the heating on for long enough? | ||
Flow temperature | Set a higher flow temperature. | ||
Thermostat valve in the reference room | Operate the TRV to ensure that it does not stick | ||
Fully open the TRV. | |||
The room temperature is higher than the set value | The Room thermostat is subject to draught or energy loss | Move the Room thermostat to a more suitable location (refer to section 3.2). | |
No flame symbol visible on the Room thermostat | The actual temperature is close to the target temperature. The control turns the boiler off early to prevent overshoot. | Set the target temperature is at least 2 ºC above the currently displayed temperature. It takes up to 6 minutes for the flame to come on. | |
The flame symbol is not available with oil-fired boiler controls. | |||
Cannot select DHW mode on the Room thermostat. NA is displayed. | The Room thermostat is part of a multiple heating zone system in combination with the Greenstar Wiring Centre. Only the primary Room thermostat (the first to be paired with the Receiver) is controlling the DHW mode. | Select the required DHW mode on the primary Room thermostat. | |
A21/ A22 | Loss of RF signal | The Room thermostat unit is incorrectly positioned | Check signal strength and reposition Room thermostat for better signal. Wire the Receiver to a wall plate if the boiler is in a loft or garage. |
The receiver or Room thermostat unit has no power supply | Check that boiler has power and that the Room thermostat batteries are not running low (see Blank display or low battery symbol). | ||
A21 will be displayed at the initial switch-on until the two units have established an RF communication link | Allow up to 1 minute after power up for the units to communicate. | ||
A23 | Room stat internal sensor failure | Internal room temperature sensor out of valid range | Replace the RF Room thermostat. |
A24 | The remote RF unit has a fault | Another room thermostat in the system has a problem | Check other room thermostats within the system for fault codes. |
Fault code Problem Description Resolution | |||
A25 | Multiple pairing fault | Displayed when no zone is available for this room thermostat | Unpair units and pair back up using a different zone setting for each room thermostat. Up to 3 zones can be set up. |
A26 | Multiple pairing fault | Displayed when 2 or more Programmable room thermostats are paired to the same Receiver, each with the same zone setting. | Unpair all units and pair back up using a different zone setting for each room thermostat. |
A27 | Unable to communicate with boiler’s EMS bus | Boiler is EMS compatible but no communication | Replace the Programmer/Receiver unit. |
A28 | Not paired | Unit is not paired | Unpair and pair all (see section 7.2). |
Receiver LED flashing once per second (1 Hz) | Not a boiler fault, possibly no RF connection with the Programmable room thermostat(s), at least one connection has been lost | Check the Programmable Room thermostat(s) for fault code (if none is displayed, turn the knob). | |
Blank display or low battery symbol | Batteries are depleted | Replace batteries and clean battery contacts. | |
Other fault | Comfort II Room thermostat also displays boiler fault codes. | Refer to the boiler’s Installation, Commissioning and Servicing instruction manual. |
Set the Receiver to the unpairing mode:
Set the Receiver to the pairing mode:
Set the Room Thermostat in pairing mode
Wait until the action is completed
When the pairing between the devices is completed, HC Assignment 1 appears on the Room thermostat display. The Receiver’s LED stops flashing, pairing is now complete. Wait or press the knob to return to the main screen. The action takes approximately one minute.
Servicing
Maintenance
These units require no maintenance apart from replacing used batteries in the programmable room thermostat. The outer casing can be wiped clean using a dry cloth, do not used polish or detergents.
Programmable room thermostat battery replacement
If under normal operation the battery low symbol appears, the batteries require replacing within 60 days or the programmed settings will be lost. Replace the batteries with the same type: LR6/AA 1.5V alkaline.
Battery access
To remove the room thermostat from the wall mounting plate:
Replace the spent batteries with new ones of the same type (AA), ensuring that they are installed in the correct orientation. Insert the batteries ensuring that the positive + end of the battery is inserted into the positive + terminal of the holder. Fit the Programmable room thermostat to the wall plate, locating the catches [1] on the top edge and then snap the bottom edge into place.
The data represented in the table below is required for the completion of Energy Related Product (ErP) Directive System Package fiche and, subsequently, the ErP system data label. ERP Labelling obligation applicable from 26th September 2015.
Supplier | Worcester Bosch Group |
Model | Comfort II |
ErP Class | V |
Function and ERP description | Load compensation Modulating room thermostat, for use with modulating heaters: An electronic room thermostat that varies the flow temperature of the water leaving the heater dependant upon measured room temperature deviation from room thermostat set point. Control is achieved by modulating the output of the heater. |
Additional seasonal space heating efficiency gain | +3% |
Environment / disposal
Environmental protection is a fundamental corporate strategy of the Bosch Group. The quality of our products, their economy and environmental safety are all of equal importance to us and all environmental protection legislation and regulations are strictly observed. We use the best possible technology and materials for protecting the environment taking account of economic considerations.
Packaging
We participate in the recycling programmes of the countries in which our products are sold to ensure optimum recycling. All of our packaging materials are environmentally compatible and can be recycled.
Electrical and electronic equipment
Scrap electrical and electronic equipment must be collected separately and returned to an environmentally compatible recycling facility (EuropeanDirective on waste electrical and electronic equipment). Use the country specific return and collection system for the disposal of electrical and electronic equipment.
Battery recycling
Batteries, rechargeable or not, must not be disposed of into ordinary household waste. Instead, they must be recycled properly to protect the environment and cut down on the wasteof precious resources. Your local waste management authority can supply details concerning the proper disposal of batteries.
Worcester
DOWNLOAD MANUALS:
WORCESTER Comfort II RF Programmable Room Thermostat Installation and operating instructions
WORCESTER Comfort II RF Programmable Room Thermostat Installation and operating instructions
Johnson Controls T7000e LCD Digital Thermostat Johnson Controls T7000e LCD Digital Thermostat Installation Guide
Honeywell T8635L Microelectronic Communicating Programmable Thermostat Honeywell T8635L Microelectronic Communicating Programmable Thermostat USER’s GUIDE
Hetta HS01RF WIRELESS THERMOSTAT Kit PAIRING INSTRUCTIONS Insert batteries into the Thermostat. Ensure that the…
HEAT-MAT NGT-567-0010 Underfloor Heating Thermostat Menu Introduction The NGT thermostat can switch your underfloor heating…
Honeywell RLV450 PROGRAMMABLE THERMOSTAT READ BEFORE INSTALLING DESCRIPTION * LP appears only for the first…
Honeywell RLV431 Programmable Thermostat Description The RLV431 thermostat can be used to control an electric…