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7.7. Summer / winter operation
This temperature control function allows differentiated management of the boiler water in the summer and
winter. The function can be managed from the control panel by pressing the summer / winter button (11) for 5
seconds.
WINTER POSITION The system pump PI is enabled for operation.
SUMMER POSITION The system pump PI is not enabled for operation. Only the storage
cylinder/combi buffer tank pump will be enabled if configured in the system.
8.
WATER CIRCUIT DIAGRAMS
All the water circuit diagrams shown in this booklet are purely indicative, and must be approved by a heating
system designer. ARCA s.r.l. is not liable for any damage to things, people or animals due to incorrect
system design. For any diagrams not explicitly illustrated in this booklet, contact the ARCA technical
department. The warranty will not cover any systems that are not commissioned in compliance with
specifications or without authorisation.
Nota:
Correct boiler operation requires installation of the recirculating pump to prevent
temperature stratification in the boiler.
The warranty is void if the recirculating pump is not installed.
8.1. Example diagrams for heating-only system with open vessel
The heating-only system consists of the following parts:
1. Boiler outlet probe (S4): this is located in the socket near the boiler outlet (attachment A6) and its reading
is used to change operating mode and enable operation of the pumps.
2. Boiler return probe (S5): this is located in the socket near the boiler return (attachment A7) and is used
for operation of the recirculating or anti-condensation pump (PR).
3. System pump (PI): this is enabled for operation above the value of TH-SYSTEM-PUMP [A01], however
it’s effectively activated based on the signal from the room thermostat. This always operates, i.e. ignores
the room thermostat, in the event of a frost alarm (outlet water temperature less than the value of TH-
BOILER-ICE [A00]) or anti-inertia operation (outlet water temperature greater than the value of TH-
BOILER-SAFE [A04]).
4. Recirculating or anti-condensation pump (PR): this is enabled for operation above the value of TH-
RECIRCPUMP [A14], however it’s only activated when the outlet water temperature exceeds the return
temperature by a delta equal to the value of parameter RECIRCULATION DIFFERENTIAL [d00] in the
protected menu. This always operates in the event of a frost alarm (outlet water temperature less than
the value of TH-BOILER-ICE [A00]) or anti-inertia operation (outlet water temperature greater than the
value of TH-BOILER-SAFE [A04]).
Summary of Contents for GRA115RO
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