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6.4 Building Frost Protection
6.4.1 Combination Boiler Models
In order to provide frost protection for the fabric of the building a frost thermostat
should:
- be fitted in the coldest room in the house
- call for appropriate zone valves to open
- allow the boiler to operate irrespective of time clock condition
If the Internal Programmer is used, CH must be enabled, and Manual Override set
to continuous, and the room thermostat set to a low setting.
To prevent over heating of the property a pipe thermostat should be fitted on the
return pipe close to the boiler.
To protect the fabric of the appliance only, the Combination Boiler models are
fitted with frost protection, see section 1.13.
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