Important Recommendations - Roca LAIA 25 GTA Confort S Instructions D'installation, De Montage Et De Fonctionnement

OPERATION
Domestic Hot Water Service Only
1
During Domestic Hot Water demand (draw-off):
- The symbol will flash slowly.
- Production of hot water begins when the cylinder water temperature drops 2 °C
below the set value (the factory setting is 60 °C) and stops when the cylinder
water reaches the setpoint temperature.
- The boiler water is self-regulating to reach 80 °C.
- The DHW pump will only run the first time provided the boiler water temperature
is higher than that in the DHW cylinder +5 °C and the boiler temperature is
higher than the "Min. Heat. Temp."
2
When Domestic Hot Water demand (draw-off) finishes:
– The symbol in the display window is permanently ON.
– The burner and pumps do not operate; but they do for maintenance.
- The burner will stop running, but the DHW pump will continue to run for one minute
or until the boiler water temperature drops below the "Min. Heat. Temp.". At this
point, the Heating pump will stop running.

IMPORTANT RECOMMENDATIONS

– With regard to room-sealed boilers, after any operation (Cleaning, Maintenance,
etc.) that implied the dismantling of those components that contribute to the
leak-tightness of the boiler (burner support cover, connections to air intake
ducts and flue gas removal, etc.), it is essential that their operating condition be
guaranteed on re-assembly. The nuts and bolts that secure the burner support
cover to the boiler body should be screwed fully home and the connections to
the above-mentioned ducts should be done with special care.
- Any modification and or replacement of cables and connections, excepting
those for the room thermostat, should be performed by a Roca Service Technician.
- It is recommended that the properties of the water in the system be:
p H
H a d r n e s s
* One French degree is equivalent to 1 gram of calcium carbonate per 100 litres
of water.
b e w t e e n 7 5 . a n d 8 5 .
b e w t e e n 8 a n d 1 2 F e r n c h d e g e r e * s
Combined Central Heating and DHW Service
+
No matter which service mode has been selected, the burner will take priority
over Domestic Hot Water.
The symbol will flash and the
During Domestic Hot Water draw-off, operation will coincide with that described
1
When demand for Domestic Hot Water stops (but not for Heating):
in the previous section.
- The symbol will flash slowly, but not the
- The burner will run until the boiler temperature reaches the setpoint value for
Heating.
- The Heating pump will start running when the boiler temperature rises above
the "Min. Heat. Temp." and will stop running when the boiler temperature drops
2
7 °C below the "Min. Heat. Temp."
When demand for Heating ends:
- The and symbols will stop flashing.
- The burner and the pump will stop running
- The burner will stop running, but the DHW pump will continue to run for one minute
or until the boiler water temperature drops below the "Min. Heat. Temp.". At this
point, the Heating pump will stop running.
- If it were absolutely necessary to add water to
the system, wait until the boiler is completely
cold before doing so.
Note:
Characteristics and performance qualities are subject to change without notice.
CE Marked
The LAIA GTA Confort Heating Units are certified to comply with the essential
requirements of the Electromagnetic Compatibility Directive 89/336/EEC, the Low
Voltage Directive 73/23/EEC, and the Energy Efficiency Directive 92/42/EEC, and
97/23/EEC Pressurized Equipaments, are therefore permitted to carry the
CE mark .
symbol will be permanently ON.
symbol.
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