Water connections must be made in accordance with the outlook diagram delivered with the unit, respecting the water in- and outlet. If
air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting
the water circuit:
▪
Use clean pipes only.
▪
Hold the pipe end downwards when removing burrs.
▪
Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
▪
Use a good thread sealant for the sealing of the connections. The sealing must be able to withstand the pressures and tempera-
tures of the system.
▪
When using non-brass metallic piping, make sure to insulate both materials from each other to prevent galvanic corrosion.
▪
Because brass is a soft material, use appropriate tooling for connecting the water circuit. Inappropriate tooling will cause damage
to the pipes.
6.5.1 Flushing and air venting the heating system
When filling water, the following start-up procedure should be followed.
1. All system components and pipes must be tested for the presence of leaks.
2. Preparation of a make-up water assembly or flushing unit is recommended for installation and service.
3. Before connecting pipes to the outdoor unit, flush water pipes clean to remove contaminants during hours using a flushing unit or
tap water pressure if it is adequate.
4. Fill water into the outdoor unit by opening shut-off & drain valve.
5. Vent the air. (Fill with a flushing unit with sufficient capacity: avoid aerating the water)
6. Circulate for long enough to ensure that all air has been bled from the complete water piping system.
Caution After installations, commissioning should be performed by qualified
representatives. Unless flushing and air venting works are performed
adequately, it might result in malfunctions.
6.5.2 Pressure relief valve
The outdoor unit does not have a built in pressure relief valve and requires an external to be installed. The valve shall prevent abnormal
water pressure from damaging the system by opening at 1,5 bar.
Caution Make certain that the discharged water out of the drain pan does not
affect other elements.
Installation Guide Athena
AWAT01IGCG0102 Thermia AB
30
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