Worcester Bosch GREENSTAR 25SI Instruction manual

Greenstar 25SI / 30SI - Quick User Guide
1. Master switch for on / off
2. Central heating temperature control
3. Domestic hot water temperature control
4. Mains on / off indicator and fault diagnostic light
5. Burner on indicator light (green)
6. Eco button (Domestic hot water preheat on/off)
7. Fault reset button
8. System pressure gauge
9.Position for optional programmer
SWITCHING THE BOILER ON/OFF
Switching on
Switch on the boiler by pressing the main power
button. The indicator light shows blue
Switching off
Turn the temperature control knob to the
snowake symbol to switch off the central
heating
BOILER FROST PROTECTION
If the temperature within the boiler falls below 8°C
the pump will run to circulate water and prevent
the system freezing. If the temperature within the boiler falls below 5°C the boiler will
re periodically, bringing the boiler temperature up to 12°C to avoid the possibility of the
system freezing.
SETTING TEMPERATURE FOR YOUR HEATING
Turn the temperature control knob to the
desired level. This is the temperature the
boiler will heat the radiator water to. The
control knob should generally be set to 4
or 5. Lower for smaller homes, higher for
larger homes. Set your room thermostat for
room temperature
RADIATOR -
WATER TEMP
Min---40°C
1 --- 47°C
2--- 53°C
3--- 61°C
4--- 68°C
5--- 74°C
6--- 80°C
Max---82°C
SETTING TEMPERATURE FOR YOUR HOT WATER
The hot water temperature can be set to between
approximately 40°C and 60°C using the temperature
control. The minimum on the dial is 40° the maximum is
60°C The optimum setting is 4 which is 53°C.
THIS INFORMATION IS FROM THE MANUAL LEFT WITH YOUR NEW SYSTEM,
PLEASE REFER TO THIS FOR MORE INFORMATION

CONTROLLING CENTRAL HEATING
Set the timer (on the boiler) to the correct time
Set the times you want the heating on, if
on the clock symbol, or switch to constant
Set room thermostat (tted on the wall) to
the desired room temperature.
Set the thermostatic radiator valves (on
each radiator) to the desired settings
ROOM THERMOSTAT
(located separately from the boiler)
Don’t overheat your home - turning down
your thermostat by just 1°C
can cut your fuel bill by 10%
(source: Energy Saving Trust).
The thermostat should be set
to between 18°C & 21°C.
MT10 TIMER (ON THE FRONT OF THE
BOILER BEHIND THE COVER)
If the position is set to ON:
The system is set to heating on constant
and you need to use the wall thermostat
to control the heating
If the position is set to THE CLOCK
SYMBOL:
The system is working from the timer it will only operate
on times selected
If the position is set to OFF: The heating is turned off
DOMESTIC HOT WATER PRE-HEAT
Pre-heat reduces the time taken to produce hot water
at the tap and is controlled by the ECO button. Press
and hold the ECO button for at least three seconds
to select either, not illuminated or illuminated: When
the ECO button is not illuminated the boiler will be
in preheat mode (which will reduce the time taken
to produce hot water at the tap). OR When the ECO
button is illuminated the boiler will be in ECO mode with no pre-heat available.
FAULT CONDITION
In the unlikely event of a fault occurring while the
boiler is in operation: The reset button will ash
once per second and the mains indicator (blue light)
will ash at different speeds dependent on fault. To
reset boiler press the reset button. The reset button
will no longer be Illuminated, the mains indicator will
stop ashing.
Troubleshooting
The Heating is not coming on:
• Check the thermostat is high enough. Your heating will not come on if the room
temperature is above the temperature the thermostat is set at.
• Check the timer is set correctly, try switching to constant.
Radiator not hot all over
• Check the settings on the radiator, turn up to a higher setting
• There may be air in the system, contact North Devon Homes for help to bleed the radiators
Cloudy water
In certain areas of the country at certain times of the day it is possible that the heated
domestic hot water has a cloudy or milky appearance. This is nothing to worry about as
this cloudy appearance is simply millions of air bubbles. This can be demonstrated by
lling a glass whereupon the bubbles can be seen to disperse.