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4.6.4 Fresh Air Heating Type 2: Electric powered fresh air heating system
Occasionally it may not be possible to provide
Type 1: Hot water powered system a LPHW system, in which case an equivalent
It is Domino’s standard practice to fit a low electrically powered heater battery will be
pressure hot water (LPHW) heater battery in the required instead. The final connections will be
fresh air intake duct, to temper the intake air in made by the site electrician, but the liaison
cold weather conditions. (This is not intended to noted above with the plumber, will in this case
provide a guaranteed ambient, nor minimum, be liaison with the electrician. This will require a
temperature within the store). suitable sized 3-phase electrical supply.
The hot water will be provided by the
central heating circuit of a gas fired condensing
combi-boiler installed as part of the shopfitting
contract. This boiler will provide approximately
18Kw of heat, and the HVAC contractor should
supply and install a heater battery to this rating.
The final water plumbing connections
will be made by the site plumber but the HVAC
contractor should supply a suitable 3-way
valve and thermostat, to control the system
according to the air temperature in the duct.
It is NOT acceptable to rely solely on the boiler
thermostat to switch the heating circuit. The
HVAC contractor must liaise with the plumber
to ensure the system is left working and provide
any instructions that may be necessary to.
The plumber should install suitable
isolating valves on both sides of the LPHW coil
unit to allow for maintenance and removal
without affecting the rest of the installation. The
heater circuit MUST be filled with a suitable and
approved anti-freeze fluid on commissioning.
(“Suitable” meaning approved by the boiler
manufacturer for use in the make and model of
boiler installed in each job)
A label must be affixed inside the casing
of each boiler, warning that the heating system
contains anti-freeze and that it must be refilled.
If this is not done and the heater circuit freezes
during cold weather, the repair costs will be
passed to the Main Contractor.

4.6.4 Fresh Air Heating 3 February 2016