Technical data

Installation, user and maintenance manual – AY Condensing line, AY series
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The user modiable parameters (only if the appliance is not controlled by a DDC) are
those in menu 3 of the controller, as follows:
parameter "160": thermostat control.•
parameter "161": setpoint.•
parameter "162": dierential.•
These are hydraulic parameters and expert knowledge is required to set them.
To modify these parameters, refer to Paragraph 4.9 PROGRAMMING OF HYDRAULIC
PARAMETERS → 38.
If the appliance is connected to a DDC, follow the instructions given in the DDC ma-
nuals exclusively.
3.5 PROLONGED PERIODS OF DISUSE
When the appliance is to be inactive for a long period, it is necessary to disconnect the
appliance before the period of disuse and reconnect it before it is used again.
To carry out these operations, contact a reputable hydraulic system installation
technician.
Disconnecting the appliance before the period of disuse
You will need: the appliance connected to the power/gas supply. Necessary equip-
ment and materials.
if the appliance is in operation, switch it o with the DDC (or other consent 1.
switches) and wait for the shutdown cycle to terminate completely (approxima-
tely 3 minutes).
Close the gas cock (if compatible with the antifreeze functions) (Paragraphs 4.6 2.
FILLING THE SYSTEM CIRCUIT (APPLIANCE) → 32 and 4.7 FILLING THE APPLIAN-
CE’S INTERNAL CIRCUIT → 33).
Switch o the DDC (if present).3.
Disconnect the appliance from the mains (if compatible with antifreeze fun-4.
ctions, Paragraphs 4.6 FILLING THE SYSTEM CIRCUIT (APPLIANCE) → 32 and 4.7
FILLING THE APPLIANCE’S INTERNAL CIRCUIT → 33), and set the external power
switch in the electrical panel to "OFF" (GS - see Paragraph 5.1 CONNECTING THE
APPLIANCE TO THE MAINS → 44).
Do not leave the appliance connected to the power and gas supply if it is expected to
remain inactive for a long period.
If the appliance is disconnected in the run up to winter, make sure that there is a su-
cient glycol concentration in the internal and system circuits: see "Possible use of glycol
antifreeze" and Table 4.2 Technical data for lling the hydraulic circuit → 33. If glycol
antifreeze is not to be used, empty the hydraulic circuit completely: for this purpose
the plant must be provided with water drainage points that are adequately equipped,
sized and located, to allow the water present in the circuit to drain away completely
and to allow the correct disposal of any glycol antifreeze present. For these operations,
contact a reputable hydraulic system installation technician.