Technical data

CTC EcoZenith i250

Installation

Circulation pump, radiator system (G1) (G2)

The circulation pump is fitted on the boiler’s primary flow and must be

connected electrically from the boiler; see chapter on Electrical installation.

Mixing valve DHW (65)

Install a mixing valve for the hot tap water in order to avoid the risk of

scalding.

Safety valve DHW (93)

Fit the enclosed valve to the incoming cold water connection. Connect the

waste pipe to the waste system directly to the floor gully or, if the distance is

more than two metres, to a funnel. The waste pipe must slope towards the

waste system, be installed frost-free and left open to the atmosphere/without

pressure.

Non-return valve (48)

Fit the non-return valve to the incoming cold water connection.

Shut-off valve (94)

It is important to fit a shut-off valve (94) to both the primary and return flows.

Boiler safety valve (92)

The boiler’s safety valve (2.5 bar) is fitted in the factory on the left side of the

top. Connect the waste pipe to the waste system directly to the floor gully

or, if the distance is more than two metres, to a funnel. The waste pipe must

slope towards the waste system, be installed frost-free and left open to the

atmosphere/without pressure.

Filling valve for radiator system (90)

Fit a filling valve between the cold water connection and the radiator return

pipe, or between the cold water pipe and the expansion pipe. Observe the

building regulations of the Swedish National Board of Housing, Building and

Planning (Boverket) and the standard SS-EN 1717.

Manometer system pressure (95)

Fit the manometer on the expansion pipe or radiator return pipe.

Electric shut-off valve (47)

If the sub-mixing valve (radiator system 2) is to operate in the summertime

while radiator system 1 is switched off, the system can be supplemented

by an electric shut-off valve that closes the flow through the switching off of

radiator pump (G1).

NB: The waste pipe

must be fitted to the

waste system.

NB: It is important to

fit a shut-off valve (94)

to both the primary

and return flows.