The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4
page 8
4.4 Plumbing & Heating installation & commissioning
4.4.1 Installation
To avoid draining the entire primary system during boiler maintenance it is recommended that isolation valves are
fitted to the flow and return pipes immediately below the boiler.
Connect the primary flow and return pipes for the central heating system to the labelled connections on the boiler.
Connect the mains water supply via a filling loop to the charge and discharge valve on the boiler incorporating a
stop valve and double check valve which must be left disconnected after commissioning.
Drain taps must be located in accessible positions which permit the draining of the whole system including the
primary and the secondary (dhw) system.
Any water loss from the system should be replaced from the filling loop connection.
When draining the boiler allow air in using the boiler venting valve. Do not drain the boiler by opening the
pressure relief valve.
All capillary joints in all DHW pipework must be made with lead free solder.
The Plus - E is a self contained system boiler that manages heating flow to the radiators and or under floor
heating system. Product diagram on page 4 display the expansion vessel and pumps.
Plus - E can also be used on an open vented central heating system.
Wherever possible all pipe work should be insulated to help prevent heat loss and possible freezing, particularly
where pipes are run through roof spaces and ventilated under-floor spaces.
4.4.2 Ancillary components.
If the capacity of the in built expansion vessel on Plus - E is not sufficient for the heating system (indicated by
pressure increase of 0.6bar when system is heated), an additional expansion vessel can be installed external to
the boiler. This should be fitted to the return pipe as close as possible to the boiler.
To comply with Part L of building regulations, a room thermostat must be fitted with the boiler. This will work in
conjunction with the boiler software and outside temperature sensor to finely control the temperature in the
dwelling and minimize energy consumption. The room thermostat should not be sited in direct sunlight or close to
any heat emitter such as radiators. Thermostatic radiators valves may also be used, but should not be fitted in the
same room as the room thermostat.
After the central heating circuit has been installed open all service valves, flush pipes through and check for leaks
before commissioning and introduce the correct inhibitor for a central heating circuit in accordance with BS7593.
Commission the boiler slowly to allow air to escape through the automatic air vent. Remove air from pump using
front screw on pumps.
Pressurize the system to 1.5 bar.
Where the boiler is being retro-fitted to an existing installation, it is equally important to flush the system and
commission using inhibitor to BS7593.,
TERMO boilers are fitted with an automatic and manual air vent. The boilers are also equipped with an air-
indicator which detects the presence of air in the boiler. If air is detected and It exceeds the permitted level, air-
indicator switches off immersion heaters and circulation pump remains active, so that air is allowed to escape
easily. Once the air is dispelled the immersion heaters will be active.
