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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
PO
3
4
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).
2
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
PO
) can be used for
3
4
12
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