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31 GENERAL CHECKS
CENTRAL HEATING (CH) MODE
1. Ensure that the CH external controls are
calling for heat.
The display should read:
2. Check the boiler gas rate when the boiler is
at full output.
Check at the gas meter, with no other
appliance in use. Refer to Table 2 for gas
rate.
3. Set the central heating external controls
to OFF. The burner should go off and the
pump continue to run for 4 minutes
The display should read:
4. Check the correct operation of the timer
and all other system controls. Operate
each control separately and check that the
main burner responds.
WATER TEMPERATURES
Temperatures can be selected using the
CH temperature control (A)
32 RESTART PROCEDURE
Legend
A. CH temperature control
B. Mode Control Knob
C. Boiler Status
D. Burner 'on' indicator
33 HANDING OVER
After completing installation and commissioning of the system the installer should hand over to the householder by the following actions:
1. Hand the User Instructions to the householder and explain his/
her responsibilities under the relevant national regulations.
2. Explain and demonstrate lighting and shut down procedures.
3. The operation of the boiler and the use and adjustment of all
system controls should be fully explained to the householder,
to ensure the greatest possible fuel economy consistent with
the household requirements of both heating and hot water
consumption.
Advise the User of the precautions necessary to prevent damage
to the system and the building, in the event of the system
remaining inoperative during frosty conditions.
4. Explain the function and the use of the boiler heating controls.
5. Explain the function of the boiler fault mode.
Emphasise that if a fault is indicated refer to "Fault Codes" in the
User Guide.
6. Explain and demonstrate the function of time and temperature
controls, radiator valves etc., for economic use of the system.
7. If a timer is fitted draw attention to the timer Users Instructions
and hand them to the householder.
34
INSTALLATION
Make the following checks for correct operation:
WATER CIRCULATION SYSTEM
1. With the system COLD, check that the initial pressure is correct to the
system design requirements.
For pre-pressurised systems, this should be 1.0 bar.
2. With the system HOT, examine all water connections for soundness. The system
pressure will increase with temperature rise but should not exceed 2.5 bar.
3. With the system still hot, turn off the gas, water and electricity supplies to the
boiler and drain down to complete the flushing process.
Note: A flushing solution should be used during the flushing procedure.
Flushing solutions: Fernox Superfloc, Sentinel X300 (new systems) or
X400 (existing systems). Refer to Frame 4.
4. Refill and vent the system, add inhibitor (see Frame 4), clear all air locks and
again check for water soundness.
5. Reset the system initial pressure to the design requirement.
6. Balance the system. Refer to Frame 3.
7. Check the condensate drain for leaks and check that it is discharging correctly.
8. Finally, set the controls to the User's requirements.
Note: The pump will operate briefly as a self-check once every 24 hours in the
absence of any system demand.
Knob Setting
Max
Min
To restart boiler, turn the mode knob (B) to restart position and immediately turn knob back to
required setting. The boiler will repeat the ignition sequence if a heat demand is present.
A
CH Flow Temp ºC (ºF)
80 (176)
30 (86)
E
C
D
B
8. Loss of system water pressure
Explain that the dial underneath the boiler indicates the central
heating system pressure and that if the normal COLD pressure
of the system is seen to decrease over a period of time then a
water leak is indicated. Explain the re-pressurising procedure
and if unable to re-pressurise or if the pressure continues to drop
a registered local heating installer should be consulted.
9. Explain Boiler restart procedure.
10. After installation and commissioning please complete the
Benchmark Commissioning Checklist before handover to the
customer. For IE, its is necessary to complete a "Declaration of
Conformity" to indicate compliance to I.S. 813:2002.
IMPORTANT
11. A comprehensive service should be carried out ANNUALLY.
Stress the importance of regular servicing by a Gas Safe
Registered Engineer. In IE servicing work must be carried out by
a Registered Gas Installer (RGII).
12. Inform the householder of the guarantee/registration found within
the envelope pack and the requirement to register it to receive
the full benefit of the warranty.
Installation and Servicing
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