Thermaflow TH12 - Clearances; General Notes; Safety Valve; Pressure Gauge

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Diagram 2.2.3 - Clearances
2.2.3 Clearances
front
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.
820mm
Thermaflow
Unit
2.3.1 General notes
The boiler is intended for use in a sealed system only.
750mm
2.3.2 Safety valve
600mm
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 Gauge
A pressure gauge is incorporated into the boiler to indicate the system pressure.
The gauge has a cold fill set pointer.
2.3.4 Pump
14
The circulation pump is integral with the boiler.
Diagram 2.3.5
2.3.5 Expansion vessel
Expansion
Vessel
The TH9/210U & TH12/210U and TH9/250 & TH12/250U are both supplied
with an expansion vessel with a capacity of 25 litres and the TH9/330U &
TH12/330U is supplied with a 35 litre expansion vessel. If the system water
content exceeds the maximum quoted in
table 1, [Data] an additional 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
Thermaflow ®
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 on all models).
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 and central heating system volume combined.