External Cleaning; Checking And Correcting The Water Pressure - Riello RTC-80 Series Installation, Operation And Service Manual

5.4 External cleaning

Clean the outside of the boiler casing with a soft cloth dampened
with soapy water.
To remove stubborn marks, use a cloth dampened in a 50% mix
of water and denatured alcohol or a suitable cleaning product.
Dry the boiler after cleaning it.
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Do not use abrasive products, petrol or triethylene.

5.5 Checking and correcting the water pressure

The heating system must contain sufficient water to safeguard its
correct function.
− If the water pressure in the heating system is too low, top
up with water.
When should you check the water pressure in the heating sys-
tem?
The fill and top-up water quality must comply with the water re-
quirements in this manual.
Air pockets may form in the heating system from gases released by
the fill and/or top-up water.
− Vent the heating system (e.g. bleeding the radiators).
− If required, top up with water
Recently added fill or top-up water loses much of its volume in
the first few days because it releases gases. With new systems you
should therefore initially check the heating water pressure on a
daily basis, and thereafter at gradually longer intervals.
Once the volume of the heating system has stabilized, check the
heating water pressure monthly.
A distinction is generally made between open vented and sealed
unvented systems. In practice, open vented systems are hardly
installed nowadays. We will therefore be using a sealed unvent-
ed heating system to demonstrate how you can check the water
pressure. All settings will have already been made by the installa-
tion engineer when the system was first commissioned.
Sealed unvented systems
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NOTICE: System damage through frequent topping up.
Subject to the water quality, your heating system can be
damaged through corrosion or scaling.
− Ensure that the heating system is vented correctly.
− Check the heating system for leaks and the expansion ves-
sel for functionality.
− Observe the requirements regarding water quality.
− If water loss occurs frequently, locate the cause and rectify
the problem without delay.
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NOTICE: System damage through temperature stresses.
− Only fill the heating system when cold (the system flow
temperature must not exceed 104 °F (40 °C)).
− During operation, only fill the heating system via the fill
valve in the heating system pipework (return).
For sealed unvented systems, the pressure gauge needle should
be near the mid point of the gauge. The red needle of the pressure
gauge must be set to the pressure required for the heating system.
− Check the heating system water pressure.
− Top up with water via the filling valve in the heating system
pipework.
− Vent the heating system.
− Check the water pressure once more.
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SHUTDOWN