Express AS18 User manual

USER INSTRUCTIONS
TO BE GIVEN TO THE USER
AS18 SYSTEM
SEALED SYSTEM CONDENSING BOILER
G.C. Appliance No. 41-260-20
0086
Pin 87/BQ/44

The WW Express Boilers AS18 System is a high efficiency
condensing, fully automatic, wall mounted gas appliance for use with
natural gas. The appliance incorporates a microprocessor based, fully
modulating pre-mix gas control system with direct burner ignition.
The AS18 System provides central heating outputs between 6.0 kW
(20,500 BTU/h) and 18.0 kW (61,500 BTU/h).
Heat output is controlled according to demand by the fully modulating
pre-mix burner control. The appliance incorporates frost protection.
However this is not operational when the main electrical supply to the
appliance is isolated.
Gas Consumer Council
The Gas Consumer Council (GCC) is an independent organization which
protects the interests of gas users. If you need advice concerning energy
issues, they may be contacted on the consumer Help Line number:
08459 060708, or via their website: http://www.energywatch.org.uk
2
SAFETY
Read these instructions and the user label (fitted on the boiler front panel)
carefully before attempting to operate the appliance. Comply with all
applicable warnings.
Do not interfere with any sealed
components and use the appliance only in accordance with
these instructions.
CURRENT GAS SAFETY (INSTALLATION AND
USE) REGULATIONS OR THE RULES IN FORCE.
It is the law that all gas appliances are installed by a competent person in
accordance with the above regulations. Failure to install appliances
correctly could lead to prosecution. It is in your own interest, and that of
safety, to ensure that the law is complied with.
If the appliance is damaged, turn off the appliance and consult a CORGI
registered installer.
If it is known or suspected that a fault exists on the appliance it MUST
NOT be used until the fault has been rectified by a competent person.
2.2
ELECTRICAL SUPPLY
This appliance must be earthed.
Supply: 230V ~ 50Hz fused at 3A.
The method of connection to the mains supply must facilitate complete
isolation of the appliance. Either a 3A fused three pin plug and
unswitched shuttered socket outlet, or a 3A fused double pole switch
having a 3 mm contact separation in both poles, serving only the boiler
(and its external controls), may be used.
2.3
CLEARANCES AND VENTILATION
It is not necessary to have a purpose provided air vent in the room or
internal space in which a room-sealed appliance is installed. Cupboard
or compartment ventilation is not necessary for a room-sealed appliance
providing that the minimum clearances are maintained.
1
INTRODUCTION
3
BOILER LOGBOOK
Please ensure that you have a Logbook supplied with your appliance.
This Logbook should be completed by your installer to verify that the
correct installation and commissioning procedure was followed.
Failure to complete the Logbook may result in difficulties should a
problem arise with your appliance during the guarantee period.
This Logbook forms part of the industry's Benchmark code of practice for
the installation, commissioning and servicing of central heating systems.
All CORGI Registered Installers carry a CORGI ID card and have a
registration number. Both should be recorded in your Logbook.
You can check your installer is CORGI registered by calling CORGI on
0870 401 2230.
2.1
4
OPERATING INSTRUCTIONS
Refer to Fig. 1
1) Switch on the electrical supply.
If heating is required, ensure any programmer is set to an ON time.
Turn up the room thermostat (if fitted).
2) Turn the control knob to the midpoint between minimum and
maximum setting. The digital display changes from ' o ' to ' c '.
3) When the burner has lit the digital display changes to ' C ' to indicate
heating ON and a small dot will appear in the bottom right corner
of the display.
4) If the burner fails to light the fan will stop. Initially this may be due to
air in the gas supply. The boiler will automatically have five attempts
at ignition. After the five attempts it may be necessary to RESET the
boiler by turning the control knob fully anti-clockwise to the RESET
position and repeat from step 3.
5) If the digital display reads ‘ ’ it is an indication that the heating is
satisfied, and the boiler is performing a pump over-run function. This
is perfectly normal.
TO LIGHT THE BOILER IN CENTRAL
HEATING MODE
4.1
4.2
CONTROL OF WATER TEMPERATURE
CH: Adjustable via the CH temperature control knob to give radiator
temperatures of between 30°C and 80°C. To operate the boiler more
efficiently it is recommended to set the CH temperature about half way
(between '+' and '-'). To avoid setting the control knob temperature to
‘STANDBY’ in summer when CH is not required, switch any programmer
or room thermostat to OFF.
Note: All the Lock-out and Blocking codes will
flash if displayed.
Aflashing '
C ' indicates that the boiler is in service
mode and that the boiler will fire continuously at
minimum input. (See fig.2)
This setting is for the convenience of the
Service engineer ONLY.

1
2
LED CODE FAULT/EFFECT REASON
1 Overheated appliance Water temperature greater than 105 °C
2 Differential check faulty/Flame for 15 seconds Zero check faulty CH
3 No gas or lockout flame signal/Lockout after 5 ignition attempts Low gas pressure. No flame signal on ignition, or loss of signal during operation
4 Flue gas sensor Flue gas temperature greater than 95 °C
5 Defective sensor or thermal fuse Defective flue sensor or open circuit thermal fuse.
6 Defective gas valve/Flame continues after demand ends 5 sec flame signal after burner is switched off
7 Defective fan Missing or Erroneous RPM signal
A PCB error Internal error
Activate BCC (if fitted) New BCC (if required)
Safety system failure Failure of internal self checking system
E BCC error (if fitted) Incorrect /missing BCC
O Water flow failure/Flame for a short period only Sensor temperature differential incorrect
P Power supply error Low mains voltage
Lock out Faulty Low Voltage Harness
(No display) No light indication Defective power supply
NOTE: FAULT CODES 1 TO 4 MAY BE RESET BY FOLLOWING THE PROCEDURE IN SECTION 5.4 OF THE
INSTALLATION MANUAL, HOWEVER IF ANY OTHER FAULT CODE IS SHOWING PLEASE CONTACT YOUR INSTALLER
OR WW EXPRESS BOILERS SERVICE HELPLINE TEL: [phone]

4.6
PRESSURE GAUGE
The pressure gauge on the control fascia panel indicates the central
heating system pressure. If the normal running pressure is seen to
decrease from the original installation pressure of around 1 bar (cold)
over a period of time, then there may be a water leak. In this event
consult a CORGI registered installer.
Do not attempt to fire the boiler if the pressure has reduced
to zero from the original setting.
To ensure continued efficient operation of the appliance, it is recommended
that it is checked and serviced as necessary at regular intervals. The
frequency of servicing will depend upon the particular installation
conditions and usage but in general once a year should be adequate. It is
law that any service work must be carried out by a competent person such
as British Gas or other CORGI registered personnel.
GENERAL CARE
The front panel, being a powder coated white finish should be cleaned
with a damp cloth and mild detergent. Do not use abrasive cleaners.
ROUTINE SERVICING
WARNING
If a gas leak is suspected or exists, turn the gas OFF at the
incoming mains (adjacent to the meter). Do not operate any
electrical switches. Do not operate any electrical appliances.
Open all windows and doors. Do not smoke. Extinguish all
naked lights. Phone the Transco 24 hour emergency number
immediately on 0800 111 999.
(Do not call from a mobile phone).
The boiler is fitted with a condensate trap.
The condensate drain point must not be modified or blocked
(see section 4.6 of the installation manual).
Like all condensing boilers this appliance will produce a
plume of condensation from the flue terminal. This is due to
the high efficiency and hence low flue gas temperature of
the boiler. It is normal and not a fault indication.
5
6
7
PLUMING FROM TERMINAL
8
4.3
TO TURN THE BOILER OFF
For short or long periods
Switch the programmer and/or room thermostat switch to the OFF
position.
Note: The appliance is fitted with a frost protection device. In the event
of very cold conditions, the pump may operate and the boiler light for a
few minutes to protect the appliance from potential frost damage. This
can only function if the gas and electricity supplies are maintained and
the control knob on the appliance is set to the ‘STANDBY’ position.
This function automatically operates the boiler when the heating system
water reaches temperatures below 5°C.
If either the gas or electricity services are to be isolated during a period
when frost is likely, the water circuits must be drained.
4.4
BOILER OVERHEAT PROTECTION
The appliance is fitted with two water temperature thermisters located on
the flow and return pipes. In the event of overheating, the boiler will shut
down and the digital display will show ' 1 '. Allow the boiler to cool, then
briefly turn the control knob fully anti-clockwise to the RESET/STANDBY
position and then back to 'ON' within TWO seconds.
If the fault persists, consult a CORGI registered installer.
4.5
DIAGNOSTIC DIGITAL DISPLAY
Refer to Fig. 2
If the digital display shows an error code between 1 and 4 the boiler is in
lockout condition
To RESET the boiler turn the control knob fully anti-clockwise to the
RESET/STANDBY position and then back to 'ON' within TWO seconds.
For faultfinding, refer to the diagnostic chart shown on the previous page,
together with the notes given in sections 8.1, 8.2, 8.3 and 8.4 of the
boilers installation manual.
SERVICE HELPLINE: 01926 834834
03/07 751188
Manufactured for William Wilson by Halstead Boilers Limited.
Halstead Boilers Limited, 20/22 First Avenue, Bluebridge Industrial Estate, Halstead, Essex C09 2EX.
Enquiries Line: 01224 877522. Service Helpline: 01926 834834.
Halstead Boilers is continuously improving its products and may therefore change specifications without prior notice.
The statutory rights of the consumer are not affected.