Protherm 100 Manual for instruction and use - page 13
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The top cover can be removed after the
two self-cutting screws located at the back
of the boiler have been removed. When
the screws have been removed, lift the
cover upwards.
The boiler’s control panel front can be
dismantled after removing the two self-
cutting screws in the panel’s top corners.
The remaining covers (side and rear) are
attached by three lugs and self-cutting
screws to the boiler’s chassis. The covers
are connected by protective wires to the
boiler’s electrical wiring.
Heating system pump
Select the heating system pump accord-
ing to the design. Problems (e.g. insuffi-
cient heating water circulation) caused by
using a different than prescribed pump are
not covered by the manufacturer’s warran-
ty. In addition to other aspects, the pump
delivery pressure rating must be designed
taking into account overall losses in the
heating system and in the boiler.
Properties of the heating system
and filling it with water
The emergency thermostat temperature
must be set depending on the expansion
vessel type (closed or open). The emer-
gency thermostat is located under the
boiler’s front cover (see Fig. X). For open
systems, set the emergency temperature
to 98°C, for closed systems to 105°C.
In open systems it is also necessary to
limit the range of the operating heating
water control unit to not more than 85°C,
to prevent overlapping of their ranges due
to tolerances, and undesirable reactions
of the emergency thermostat.
The operating control unit limiting is done
with an arresting wire clip situated inside
the control button. The clip can be access-
es after pulling the button off the thermo-
stat shaft. The setting must be checked in
an operation test.
After filling the heating system with water,
bleeding it and adjusting the expansion
pressure vessel (if one is installed), mark
the resultant pressure of the heating water
in cold state by pointing the red (adjust-
able) hand of the boiler’s pressure gauge
at it.
Instructions for installing closed
expansion pressure vessels
Expansion vessels and safety pipes (con-
necting the boiler with the pressure vessel)
must be protected against freezing. The
maximum operating pressure in closed
expansion vessels must mot be lower than
the opening pressure of the safety valve,
and this must not be higher than the per-
missible operating pressure of the boiler’s
body; hence it is not recommended that
the operating pressure of the expansion
vessel exceed the operating pressure of
the boiler’s body. Closed heating systems
(with a closed expansion vessel) must be
equipped with a low water level detector; if
the water drops below the minimum level,
the boiler must be shut down in such a
way that it can be restarted only after op-
erator intervention.
The heating water system pipes, its joints
and embedded elements (shutting valves,
meter connectors and meters, etc.) must
not be causes of leaks, i.e. they must be
able to withstand the maximum operating
pressure and temperature with a sufficient
reserve.
The boiler’s electrical compartment as
well as the service section of the control
panel is accessible after folding the top
boiler cover. After dropping the cover for-
ward, the terminal box becomes accessi-
ble for connecting accessories. The panel
remains connected with the electrical
compartment by wires and capillaries of
meters and thermostats.
Important:
the boiler must be earthed.
If the boiler is run with a room control unit,
before it can be connected, the jumper in
the terminal box must be removed. Other-
wise the jumper is left in.
The room control unit’s power supply wires
are connected to terminals Pr1 and Pr2,
positions 4 and 5. Recommended wire
cross-section is 0.5 to 1.5 sq. mm.
The principle of the room control unit out-
let’s zero-potential must be respected.
If a bimetal control unit, which requires
230 V power supply is used, then the
phase (L) and neutral (N) unit’s terminals
are connected to terminals Pr1 (position
4) and N of the boiler side, respectively.
The control unit’s outlet terminal is con-
nected to terminal Pr2 (position 5) on the
boiler side. Minimum rating of the control
unit outlet terminals should be 230 VAC/2
A (induction load).
Pump wiring – if the pump’s input exceeds
the boiler’s power supply circuit breaker
rating, an additional switching element
(contactor) must be installed.
Interconnecting the boiler with an
indirectly heated reservoir
The boiler’s internal wiring allows several
ways how to interconnect the boiler with
an indirectly heated reservoir.
a) Topping-up pump.
b) A three-way, actuator-controlled valve
and the boiler thermostat using an RVA
43.222 equithermal regulator.
Connecting equithermal control unit
The boiler’s standard wiring allows the
boiler control to be extended. The so called
switching kit can be ordered, by means of
which the boilers can be connected to one
of Siemens Albatross equithermal control
units, RVA 43.222, 63.242 or 63.280. Ba-
sic properties or these equithermal control
units are detailed on page 13.
For connecting an equithermal control
unit, the printed circuit board (behind the
control panel) is equipped with a connec-
tor, “J1”, which is as standard fitted with
jumpers. The installation is performed as
follows:
1. Take out of the switching kit box the
connector which is already fitted with
wires. Connect lose ends of the wires to
relevant terminal boxes which are also
part of the switching kit, depending on
the control unit type.
Schematic wiring diagrams are shown on
pages 37 - 39.
2. Part of the RVA 63.242 and RVA 63.280
switching kit is an auxiliary printed cir-
cuit board which can be used for instan-
ce for connecting pumps and valves for
blending circuits. If you are using one of
these, connect the “J1” wire as indica-
ted in the wiring diagram.
Important:
each of these control units
requires specific wiring, and hence it is
not possible to use the ready made wiring
for a different type of equithermal control
unit.
3. Disconnect the boiler from power sup-
ply.
4. Pull the jumper off the boiler printed cir-
cuit board connector and replace it with
the connector supplied with the swit-
Electrical wiring