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4.7.4 Fresh Air Heating
Type 1: Hot water powered system not done and the heater circuit freezes during
It is Domino’s standard practice to fit a low cold weather, the repair costs will be passed to
pressure hot water (LPHW) heater battery in the the Main Contractor.
fresh air intake duct, to temper the intake air in
cold weather conditions. (This is not intended to Type 2: Electric powered fresh air heating system
provide a guaranteed ambient, nor minimum, Occasionally it may not be possible to provide
temperature within the store). a LPHW system, in which case an equivalent
electrically powered heater battery will be
The hot water will be provided by the central required instead. The final connections will be
heating circuit of a gas fired condensing made by the site electrician, but the liaison
combi-boiler installed as part of the shopfitting noted above with the plumber, will in this case
contract. This boiler will provide approximately be liaison with the electrician. This will require a
18kW of heat, and the HVAC contractor should suitable sized 3-phase electrical supply.
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

4.7.4 Fresh Air Heating 3 February 2016