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2.2.3 Clearances allow for external primary heat transfer kit
The boiler should be positioned so that at least the minimum
operational and servicing clearances are provided, see diagram
2.2.3 additional clearances may be required around the boiler for
installation. A clearance of 600mm is required at the front of the
boiler for maintenance and installation.
2.3.1 General notes
The boiler is intended for use in a sealed system only.
2.3.2 Safety valve
The safety relief valve is an integral part of the boiler. It cannot
be adjusted but has a manual test device.
2.3.3 Pressure & Temperature Gauge
A pressure and temperature gauge is incorporated into the boiler to indicate the system pressure and
temperature. The gauge has a cold fill set pointer.
2.3.4 Pump
The circulation pump is integral with the boiler.
2.3.5 Expansion vessel
The 210L and 250L units are supplied with a
25 litre
expansion vessel and
the 330L is supplied with a
35 litre
Expansion vessel. If the water content of the
heating system exceeds the maximum quoted in
table 1
,
[Data]
an additional
expansion vessel should be connected into the system as close as possible
to the central heating return connection of the boiler.
Ref. Di
agram 2.3.5
The charge pressure shall not be less than the static head at the point of
connection, which is the height of the top point of the system above the
expansion vessel.
2.3.6 By- pass
An automatic by- pass valve should be incorporated in the system for maximum system
efficiency.
(A By-Pass MUST be fitted to the system by the installer).
2.3.7 Filling sealed systems
The boiler has a filling loop incorporated within it, and pressure gauge to register the fill pressure.
There must be no permanent connection to the mains water supply; even though a non return valve is
supplied.
Disconnect filling loop and seal both valves with suitable caps.
2.3.8 Corrosion inhibitor
The maintenance of sufficient concentration of corrosion inhibitor in your Thermaflow system is vital to
prevent corrosion. We would recommend sentinel X100, or equivalent. Dose appropriately according to
the size of the Thermaflow boiler and central heating system volume combined.
14
Thermaflow ®
Expansion
Vessel
Diagram 2.3.5
front
700mm
750mm
Diagram 2.2.3
- Clearances
Thermaflow
Unit
600mm
