Keston HEAT 45 User manual

User Instructions
FAN POWERED HIGH EFFICIENCY
MODULATING CONDENSING
GAS BOILER
CE/PI No. 86-CN-69
Heat 45 - GC No. 41-930-40
Heat 55 - GC No. 41-930-41
Heat 45 & 55
These instructions must be left either with the
user or next to the site gas meter.
Keston Heating
PO Box 103, National Avenue, Kingston Upon Hull, HU5 4JN
Tel. [phone] Fax. [phone]
email : [email protected] web : www.keston.co.uk
COMPLIANT WITH BUILDING REGULATION PART L1 & L2
SEDBUK A RATED

2Keston Heat - User’s
CAUTION. To avoid the possibility of injury during the installation, servicing or cleaning of
this appliance care should be taken when handling edges of sheet steel components.
All Gas Safe Registered Engineers carry a Gas Safe Register ID card, and have a registration number.
Both should be recorded in your Log Book. You can check your installer by calling Gas Safe Register direct on 0800 4085500.
Introduction
The Keston Heat is a wall mounted, room sealed, super efcient
condensing boiler featuring full sequence automatic spark ignition
and fan assisted combustion.
Due to the very high efciency, condensate is produced from the
ue gases and this is drained to a suitable disposal point through
the plastic waste pipe at the bottom of the boiler. A condensate
‘plume’ will also often be visible at the ue terminal.
Safety
Current Gas Safety (Installation & Use)
Regulations or rules in force.
In your own interest, and that of safety, it is the law that this boiler
must be installed and maintained by a Gas Safe Registered
Engineer or in IE a competent person, in accordance with the
above regulations.
The appliance should be serviced at least once a year by a Gas
Safe Registered Engineer or in IE a competent person.
It is essential that the instructions in this booklet are strictly
followed, for safe and economical operation of the boiler.
Electricity Supply
The appliance must be earthed.
Supply 230 V - 50 Hz. The fusing should be 5A.
This appliance is intended to be connected to the supply via a
double-pole switch, having a 3mm contact separation in both
poles, serving only the boiler and system controls. Alternatively, a
3-pin UNSWITCHED socket may be used.
Important Notes
•This appliance must not be operated without
the casing correctly tted and forming an adequate seal.
• If the boiler is installed in a compartment then the
compartment MUST NOT be used for storage purposes.
• Do not store objects around or on the boiler, and keep access
clear at all times.
• Do not obstruct ventilation ducts, grilles or openings in the
boiler room, room space or compartment that the appliance is
installed in, or the passage of combustion and ventilation to
the boiler.
• Do not turn off the boiler if it is to be left unattended in frosty
weather.
• If it is known or suspected that a fault exists on the boiler then
it MUST NOT BE USED until the fault has been corrected by a
Gas Safe Registered Engineer or in IE a competent person.
• Flammable materials must not be placed in close proximity to
the appliance. Materials giving off ammable vapours must not
be stored in the same room as the appliance.
• This appliance can be used by children aged from 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 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
In cases of repeated or continuous shutdown a Gas Safe
Registered Engineer or in IE a competent person should be called
to investigate and rectify the condition causing this and carry out
an operational test after each intervention on the device. Only the
manufacturers original parts should be used for replacement.
Minimum Clearances
Clearances of 300mm (12”) below, 25mm (1”) at the sides and
450mm (17 3/4”) at the front of the boiler casing must be allowed
for servicing.
To light the boiler (Refer to Frame 1)
1. CHECK THAT THE ELECTRICITY SUPPLY TO THE BOILER
IS OFF.
2. Set the boiler to standby.
3. Switch on the electricity supply to the boiler and check that all
external controls, e.g. programmer, room thermostat, etc are
on. Allow the boiler to carry out a self check.
4. Set the boiler to winter.
The boiler will commence the ignition sequence, supplying heat to
the system when required.
Keston Heat
45 & 55
Natural Gas
PI No. 86 CN 69
Destination Countries: GB, IE, RO

3
Keston Heat - User’s
1 BOILER CONTROLS / DISPLAY
SELECT
2nd STAT
1st STAT
ENTER CHANGE
BURNER ON
RESET
Standby Mode
For Central Heating
select Winter Mode
For Hot Water
select Summer or Winter
Standby Mode
If the boiler has been switched to Standby Mode the following screen will be displayed
No Boiler operation will take place with this setting. See Frame 36 to change to Summer or Winter
setting
Summer Mode
For Central Heating
select Winter Mode
No Hot Water Demand
Switched Live Off
Summer Mode
If the boiler has been switched to Summer Mode a screen similar to the following will be displayed
(line 5 may vary depending on setup)
Domestic Hot Water operation will take place with this setting but Central Heating will not.
See Frame 36 to enable Central Heating by changing to Winter setting
Winter Mode
No Central Heating
Demand
No Hot Water Demand
Switched Live Off
Winter Mode
If there is no current Heat Demand a screen similar to the following will be displayed (line 5 may vary
depending on setup)
Line 5 indicates “Switched Live” or “OpenTherm” or “0-10V” depending on which controls are
connected to the boiler
DHW 230V Operation
Switched Live 2 On
Burner On
DHW Thermostat
Flow Temp 80°C
Domestic Hot Water Mode (DHW Thermostat)
If there is an ongoing Domestic Hot Water Demand using a DHW
Thermostat screens similar to the following will be displayed
Line 2 indicates whether Switched Live or OpenTherm is
controlling the boiler
Line 3 indicates the current operating State (Pre-Purge or Ignition
or Burner On or Pump Overrun)
Burner Power and Flow Temperature will vary as the boiler
operates
DHW 230V Operation
Burner Power 100%
Burner On
DHW Thermostat
Flow Temp 80°C
CH 230V Operation
CH Switched Live On
Burner On
Flow Setpoint 80°C
Flow Temp 80°C
Central Heating Mode
If there is an ongoing Central Heating Demand screens similar to
the following will be displayed
Line 2 indicates whether Switched Live or OpenTherm is
controlling the boiler
Line 3 indicates the current operating State (Pre-Purge or Ignition
or Burner On or Pump Overrun)
Outside temperature will only be shown if an outside sensor is
connected to the boiler
Burner Power and Flow Temp will vary as the boiler operates
See Frame 36 for adjusting Flow Setpoint
CH 230V Operation
Burner Power 100%
Outside Temp’ 10°C
Flow Setpoint 80°C
Flow Temp 80°C
Boiler Frost Protection Mode
If the boiler ow temperature drops below 5°C screens similar
to the following will be displayed
Line 3 indicates the current operating State (Pre-Purge or
Ignition or Burner On or Pump Overrun)
Outside temperature will only be shown if an outside sensor
is connected to the boiler
Burner Power and Flow Temp will vary as the boiler operates
Boiler Frost Protect
Burner Power 100%
Outside Temp’ 10°C
Frost Setpoint 5°C
Flow Temp 80°C
Boiler Frost Protect
Burner Power 100%
Burner On
Frost Setpoint 5°C
Flow Temp 80°C

4Keston Heat - User’s
2 KESTON HEAT USER INTERFACE - BASIC OPERATING INSTRUCTIONS
SETTING STAT 1 TEMPERATURE
Set Stat 1 Temp’
80°C
Rotate the knob until the desired temperature is shown and then
press ENTER to store
Rotate Stat 1 and the following screen will be displayed.
Keston 45kW
Normal Operation
Set Stat 1 Temp’
Set Stat 2 Temp’
Press SELECT and a screen similar to the following will be displayed
The kW output number in the 1st line will vary depending the
maximum output of the boiler
Keston 45kW
Set Stat 2 Temp’
Set Off/Sum/Win
Out’ Sensor Slope
Normal Operation
Rotate 1st stat clockwise until a screen similar to following is displayed
Set Off/Sum/Win
Standby
Summer
Winter
Press - for more
Press SELECT and a screen similar to the following will be displayed
Press + and - to change to required setting, press ENTER to store
Rotate the KNOB anti-clockwise until Normal Operation is highlighted
again and press SELECT to return to normal operation
SETTING SUMMER, WINTER AND STANDBY OPERATION
Note that Standby Mode will disable Domestic Hot Water and
Central Heating, Summer Mode will disable Central Heating

5
Keston Heat - User’s
To shut Down the Boiler
1. For short periods
Set the external controls to OFF. Wait 4 minutes and then
isolate the mains supply to the boiler.
2. For longer periods
Set the external controls to OFF. Switch the electricity supply
to OFF. For longer periods the entire system should be
drained, including the domestic hot water supply.
To Relight the Boiler
Rell the system if it has been drained, taking care to ensure no
air is in the boiler or system.
Repeat the procedure detailed in ‘To light the boiler’.
Frost Protection
The Keston Heat boiler has built into its control system the facility
to protect the boiler only against freezing.
Note.
This may not protect remote parts of the system, in which case a
separate frost thermostat should be tted.
Boiler Overheat Thermostat
Boiler overheating is detected by electrical sensors connected
to the boiler control module. If the boiler overheats it will shut
down and the display will show Overheat Lockout. Press the
reset button and the boiler will relight. If the fault recurs turn off
the boiler and consult a Gas Safe Registered Engineer or in IE a
competent person.
Condensate Drain
This appliance is tted with a siphonic condensate trap system
that reduces the risk of the appliance condensate from freezing.
However should the condensate pipe to this appliance freeze,
please follow these instructions:
a. If you do not feel competent to carry out the defrosting
instructions below please call your local Gas Safe Registered
installer for assistance.
b.
If you do feel competent to carry out the following instructions
please do so with care when handling hot utensils. Do not attempt
to thaw pipework above ground level.
If this appliance develops a blockage in its condensate pipe, its
condensate will build up to a point where it will make a gurgling
noise prior to locking out displaying “Ignition Lockout” on the
display. If the appliance is reset it will make a gurgling noise prior
to it locking out displaying “Ignition Lockout” on the display.
To unblock a frozen condensate pipe;
1. Follow the routing of the plastic pipe from its exit point on the
appliance, through its route to its termination point.
Locate the frozen blockage. It is likely that the pipe is frozen
at the most exposed point external to the building or where
there is some obstruction to ow. This could be at the open
end of the pipe, at a bend or elbow, or where there is a dip in
the pipe in which condensate can collect. The location of the
blockage should be identied as closely as possible before
taking further action.
2. Apply a hot water bottle, microwaveable heat pack or a warm
damp cloth to the frozen blockage area. Several applications
may have to be made before it fully defrosts. Warm water
can also be poured onto the pipe from a watering can or
similar. DO NOT use boiling water.
3. Caution when using warm water as this may freeze and
cause other localised hazards.
4. Once the blockage is removed and the condensate can ow
freely, reset the appliance. (Refer to “To Light the boiler”)
5. If the appliance fails to ignite, call your Gas Safe Registered
engineer.
Preventative solutions
During cold weather, set the boiler stat to maximum, (Must return
to original setting once cold spell is over)
Place the heating on continuous and turn the room stat down to
15ºC overnight or when unoccupied. (Return to normal after cold
spell).
Escape of Gas
Should a gas leak or fault be suspected contact your local gas
supplier without delay.
Do NOT search for gas leaks with a naked ame.
Cleaning
For normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains use a damp cloth and mild
detergent.
DO NOT use abrasive cleaning materials.

Keston pursues a policy of continuing improvement
in the design and performance of its products.
The right is therefore reserved to vary specication without notice.
Keston Heating, PO Box 103, National Avenue, Kingston Upon Hull, HU5 4JN
Tel. [phone] Fax. [phone]. www.keston.co.uk