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

5.3 FROST PROTECTION & LEGIONELLA
5.3.1 FROST PROTECTION
Th e Heater is fi tted with automatic Frost Protection. Provided there is Mains power and Gas connected, if the
DHW temperature sensor or heat engine temperature sensors detect temperatures lower than 8°C the heat
engine pumps can be switched on. If the temperature detected by the Heat Engine sensors falls below 5°C the
heat engine will fi re 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. Th is plant frost protection function can be turned off if not required.
5.3.2 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
hospitals, 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 andSafety 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. Th ese factors include stagnation, lukewarm conditions
(20ºC to 45ºC) and the accumulation of debris, scale and corrosion in the base of tanks and calorifi ers.
Th e design of the base of the integral water tank in this appliance, precludes Legionella colonisation, even after
build-up of debris. Th e 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.
Th e Heater 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.

5.4 FINAL CHECKS AND USER HANDOVER

5.4.1 CLEANING THE APPLIANCE
Th e 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.
5.4.2 USER HANDOVER
When commissioning is satisfactorily completed the user must be instructed on the use and operation of the
appliance and in particular detail:
• Hand over the "User' s Instruction 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 interferred
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 inspected and
serviced regularly as indicated by the manufacturer.
ANDREWS COMBIfl o DRAFT 48 GB/IE