5
HYDRAULIC INSTALLATION
Installation, user and maintenance manual – AY Condensing line, AY Series
21
To prevent the water freezing in the internal and system circuits, the appliance is equipped with an antifreeze function.
There are two antifreeze functions, both of which operate only on active modules.
The hydraulic circuit is protected from icing by an electronical anti-freezing function; it operates by activating the water pump (if
directly managed by the unit) ed eventually the burner of the units. The function, already factory activated on every unit, can be
deactivated only by adding an adequate amount of anti-freezing glycole in the hydraulic circuit or by emptying the hydraulic circuit
at the beginning of the winter season.
The second antifreeze function protects the internal circuit against freezing; it runs the internal circuit water circulator. This function
may not be deactivated inasmuch it is also used to protect the machine’s electronics during normal operation.
The machine is factory charged to 2 bar with a water/glycol mix which enables the machine to be safely stored down to
-30°C.
The antifreeze function, in order to protect the internal circuit, actuates the dedicated water circulator so as to keep the
water in the circuit at a temperature of more than -10°C and hence the electrical components at more than -20°C. Make sure
that the machine's internal circuit is always charged with an adequate glycol solution.
It is therefore necessary to ensure a continuous supply of electricity and gas to the appliance throughout the whole of the
winter period. If it is not possible to ensure a continuous supply of electricity and gas to the appliance, use glycol antifreeze
of the inhibited monoethylene type.
Active and passive modules
If the Robur appliances are not controlled by a DDC. In appliances with only hot and only cold modules (e.g.: AY series) or
appliances of the 4 pipe type with two distinct cold and hot modules, the module is ALWAYS "active". in 2 pipe type (hot
and cold) appliances, the “cctive” module is the one that operated the last shutdown; the other module will be the “passive”
module.
If the appliances are controlled by a DDC. If the DDC manages a 2 pipe type plant (only hot, or only cold), or a 4 pipe type
plant (hot and cold), the appliance module is ALWAYS “active”. If the DDC is controlling a 2 pipe hot/cold system, the active
module is the one set as such on the DDC. As an example, if
heating
is set on the DDC, all the hot modules managed by the
DDC will be “active”; all the cold modules controlled by the DDC will be “passive”.
If glycol antifreeze is to be used in the hydraulic circuit, DO NOT USE galvanised pipes and connections. Consult the notes on "Pos-
sible use of glycol antifreeze" contained in Paragraph 5.6
→
25 and in any case the technical specifications of the glycol to be used.
The sizing of the pipes and pump must guarantee correct operation of the appliance (for calculation of pressure drops in the appli-
ance, refer to the technical data, Paragraph 3.4
→
9).
The operations necessary for the first activation or regulation of the appliance and of the Direct Digital Controller must be
carried out exclusively by an authorized Robur Technical Assistance Centre (TAC). These operations are described in Section
7
→
50.
The products’ guarantee is void if initial activation is not carried out by a Robur TAC.
The following figures show examples of typical hydraulic circuits, composed of a single or multiple appliances.
For further information and technical support regarding other configurations, contact Robur S.p.A. Presales. (tel. 035
888.111).
