Frost Protection And Legionella; Final Checks And User Handover - andrews COMBIflo 100/300 Installation, Operation And Maintenance Manual

5.4 FROST PROTECTION & LEGIONELLA
5.4.1 FROST PROTECTION
This appliance is fi tted with automatic Frost Protection. Provided there is Mains power and Gas connected, if
the temperature registered by the Heat Engine, DHW tank or Heating Circuit sensors falls below 5°C the heat
engine(s) will ignite to bring the fl ow temperature up to 16°C and then turn off . NB Plant frost protection is turned
on by default and will operate the heating zone pumps in two stages once the outside temperature drops below
-1°C and -4°C. This plant frost protection function can be turned off if not required.
5.4.2 ANTI-LEGIONELLA
Water systems in buildings have been associated with outbreaks of Legionnaires' Disease, particularly in health
care facilities where occupants are signifi cantly more susceptible to infection. In recognition of the risks in hospi-
tals, a Code of Practice for the Control of Legionella in Health Care premises has been issued by the Department
of Health.
Codes of Practice applicable to other premises have been published by other organisations, principally the
Health and Safety Executive (HS) (G70) and the Chartered Institute of Building Services Engineers (CIBSE,
TM13). All Codes of Practice draw attention to the design and operation of water systems with reference to
avoidance of factors that favour colonisation by Legionella bacteria. These factors include stagnation, lukewarm
conditions (20ºC to 45ºC) and the accumulation of debris, scale and corrosion in the base of tanks and
calorifi ers.
The design of the base of the integral water tank in this appliance, precludes Legionella colonisation, even after
build-up of debris. The pumped tank charging process ensures that the water at the bottom of the tank reaches
the same temperature as in the rest of the tank. In addition the controls of the appliance provide anti-legionella
routines to provide additional protection. A hatch is fi tted to the DHW tank to enable inspection and cleaning,
should it be required.
This Appliance is provided with an Anti-Legionella programme. It is set by default to be off but can be
set to be started manually or periodically. Lines 1640 to 1647 control how, and when this function will
operate.

5.5 FINAL CHECKS AND USER HANDOVER

5.5.1 CLEANING THE APPLIANCE
The casing is fi nished with a polyester coating and will mark if abrasive cleaners are used. It should be cleaned
using standard non abrasive cleaning products.
5.5.2 USER HANDOVER
When commissioning is satisfactorily completed the user must be instructed on the safe use and operation of the
appliance and in particular detail:
• Hand over the "Controls User Guide" as well as this manual and any other literature supplied.
• Explain the importance of air vents and the fl ue outlet system, and that they should not be altered or
interfered with in any way.
• Explain to the user the importance of internal water pressure and how to restore it to the correct value.
• Explain and demonstrate to the user the correct function and adjustment of the temperature, thermostats
and radiators for the economic use of the system.
• Remind the user that in order to comply to the regulations in force, the appliance has to be serviced
regularly (at least once every 12 months) and only an engineer who is a member of the Gas Safe regis-
ter should carry out any work on the appliance in the UK.
• Explain that at approximately 10:00 every Friday all pumps being controlled by the appliance will be acti-
vated in turn for 30 seconds each. This will occur even if the appliance is in standby mode. This function
is automatic and is designed to help prevent pumps from sticking if the appliance has not been in opera-
tion for some time.
ANDREWS COMBIfl o 49 GB