Airflow DUPLEX RS5 2500/1000 Handleiding voor montage - Pagina 12

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4.8.

Installing hot water heating coil

During the mechanical installation of the hot water air heater follow the manual supplied with this

optional accessory.

The supply (and top-up) water should fulfil especially the following criteria:

●

The water must be limpid and colourless.

●

The pH value of water must not be lower than 7. If water contains dissolved neutral salts its pH

value is to be between 8,5 and 9,5. Soda lye or trisodium phosphate (Na

alkalinisation.

●

The content of carbon dioxide in an ion and non-ion form is to be as small as possible.

●

The remaining supply water hardness should be lower than 7 mmol/l (at q < 23 kW/m2) and 5

mmol/l (at q > 23 kW/m2). To soften the water, the following chemicals can be used: trisodium

phosphate Na

high volume of water; when electrical boilers and radiation boilers are present).

●

The amount of calcium ion in the water up to 3,5 mmol/l (at q < 23 kW/m2) and up to 1,8 mmol/l

(at q > 23 kW/m2).

●

All CO

up to 75 mg/l (at q < 23 kW/m2) and 10 mg/l (at q > 23 kW/m2).

Exact composition of top-up water is mentioned in the norm ČSN 07 7401, in the annex, Table 1.

The following rules must be adhered to during the installation of the heater:

The maximum permitted temperature of heating medium is 110 °C and operational positive

●

pressure up to 1.0 MPa.

●

For the proper operation of the control set of the hot water heater the heating system must be

fitted with a circulation pump of suitable power that will fully cover its pressure loss. The pump,

which is supplied with the control set, is designed solely to cover the pressure loss of the water

heater!

●

If the unit is not equipped with a shut-off damper on outdoor air inlet e1, a tight, thermally isolated

shut-off damper must be installed in the duct upstream the unit (a type with a servo drive with

emergency stop, i.e. the damper automatically shuts in the event of a power outage).

●

The heating system must be equipped with a sludge filter in the inlet into the unit.

●

The heating circuit must be equipped by a safety valve and a sealed pressure vessel. Heat carrier

– untreated water or water treated as per the rules above, properly bled. Fluid with antifreeze

protection (e.g. ethylene glycol) can be used as heat carrier if necessary. We recommend isolating

the inlet and outlet piping.

Electrical installation may be carried out only by a person having the required electrotechnical

qualification.

You will find the wiring diagram in the unit's Technical Specification or in the selection SW of

DUPLEX units, tab Controls > Wiring diagram.

4.9.

Installing mixing valve of hot water air heater

During the mechanical installation and connection of the mixing valve of the hot water air heater follow

the manual supplied with this optional accessory.

4.10.

Installing electric heater / pre-heater

●

During mechanical installation and electrical connection follow the manual supplied with this

optional accessory.

●

Electrical connections may only be made by a qualified electrician authorized to service power

supply networks.

4.11.

Installing and connecting water chiller to the cool source

●

During the mechanical installation of the water chiller follow the manual supplied with this optional

accessory.

or cation-exchange resin (in case water is harder than 7 mmol/l; circuits with

) can be used for