23
1-32
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
1.30 DOMESTIC HOT WATER STORAGE
TANK UNIT.
The “Hercules Solar 26 2 ErP” boiler is the storage
tank type with a capacity of 200 litres. It contains
large coiled stainless steel heat exchanger pipes,
which allow to notably reduce hot water produc-
tion times. These storage tank units constructed
with stainless steel casing and bottoms, guarantee
long duration through time. The assembly con-
cepts and welding (T.I.G.) are implemented to the
minimum detail to ensure maximum reliability.
The upper inspection flange ensures practical
control of the storage tank unit and the coiled
heat exchanger and easy internal cleaning.
The DHW and the DHW pump connection cou-
plings are positioned on the lid of the flange (cold
inlet and hot outlet). The Magnesium Anode
holder cap including the same, supplied as per
standard for the internal protection of the storage
tank from possible corrosion, is positioned on the
side of the cylinder (part. 52 Fig. 1-33).
Storage tank unit disassembly.
For easy main-
tenance or particular handling requirements,
remove the cylinder as described below.
To disassemble the storage tank unit, empty the
boiler system by acting on the relevant drain
fitting. Before carrying out this operation, make
sure that the system filling valves are closed.
Close the cold water inlet valve and open any
domestic hot water cock. Loosen the nuts on the
system flow and return pipes (3) and the cold
inlet and hot outlet nuts present on the storage
tank unit (1). Empty the solar system via its drain
fitting. Loosen the nuts (6) on the solar system
flow and return pipes present on the cylinder.
Loosen the nut (4) on the connection pipe to
the DHW expansion vessel. Loosen the bracket
fixing screws (2) Remove the screws (5) with the
relative retainer brackets and slide the cylinder
outwards on the relevant guides. Work in reverse
order to assemble the storage tank unit.
N.B.:
have the efficiency of the storage tank Mag-
nesium Anode checked annually by a qualified
firm. The storage tank unit is prepared for intro-
duction of the domestic hot water pump fitting.
1.31 KITS AVAILABLE ON REQUEST.
• Recirculation kit (on request). The boiler
storage tank unit is prepared for application
of the pump kit. Immergas supplies a series of
fittings and attachments that allow connection
between the storage tank unit and domestic hot
water system. The pump probe fitting is already
inserted on the storage unit kit and the indica-
tion of the pump kit attachment is envisioned
on the installation template.
• System cut-off valves kit (on request). The
boiler is designed for installation of system
interception cocks to be placed on flow and
return pipes of the connection assembly. This
kit is particularly useful for maintenance as
it allows the boiler to be drained separately
without having to empty the entire system.
• Polyphosphate dispenser kit (on request). The
polyphosphate dispenser reduces the forma-
tion of lime-scale and preserves the original
heat exchange and domestic hot water pro-
duction conditions. The boiler is prepared for
application of the polyphosphate dispenser kit.
• Zone pumps kit (on request). If the central
heating system is to be divided into several
zones (
max. three
) in order to interlock them
with separate adjustments and to keep water
flow rate high for each zone, Immergas supplies
zone pump kits on request.
• Low temperature kit (on request). If the central
heating system is to be divided into high tem-
perature zones (radiators) and low temperature
zones (floor plants) in order to interlock them
with separate adjustments and to keep water
flow rate high for each zone, Immergas supplies
the low temperature kit on request.
• Low temperature safety thermostat kit. With
the boiler functioning in direct low tempera-
ture (no control downstream from the boiler),
to prevent problems to the low temperature
system a safety thermostat must be inserted
onto the flow pipe.
The above-mentioned kits are supplied complete
with instructions for assembly and use.
System draining valve
Storage tank draining valve
Solar circuit draining
valve