14
Location of Electrical Connections
and Sensors
Figures 10 (G100) and 11 (G100/GTA).
CheckingLimitThermostat Operation
It is advisable to carry out this check in order to
prevent future serious malfunction.This can only
be done if no lockout condition exists, that is,
under fault code 00 (see “Fault Code” section in
the Instructions for the Control Panel) or
because of a lockout (code 11) caused by a
fault in the limit thermostat itself.
– With the Boiler Control Service Selector key
(7), select . Fig. 9.
– Press the bar key. The pressure scale shows
the current system pressure.
– Press the +and –keys at a time. The screen
will flash 5 times before displaying code 00
only, if no lockout condition exists; in case of
lockout, the code corresponding to the fault
that caused it will be displayed.
– Stop pressing the +and –keys.
– Press the +key and, without releasing it, press
the key.The screen will flash twice before
showing the expanded temperature scale from
40 °C to 140 °C, with the segment in line with
114 °C flashing slowly.
Should the checking function have started
already, with the boiler temperature below 80°C,
the burner will fire and the pump will be OFF.The
unit will establish its setpoint temperature at
114°C.
1 – If the limit thermostat trips before the boiler
reaches 114 °C, it means that it is working
correctly. In this case the burner will not
operate but the pump will.
– The screen will alternate displaying code
04 (limit thermostat tripped) and the 40–
140 °C scale. No service indication will be
displayed on the screenabove.
– Press the –and keys at a time. The
screen will flash and then display code 04
only.
– Stop pressing the –and keys.
– Press the +and –keys simultaneously.
The screen will flash twice before
displaying the current pressure on the bar
scale.The top display screen will show .
– Stop pressing the +and –keys.
– Wait until the boiler temperature drops
below 80 °C and reset the limit thermostat.
The LED will go out.
2 – If the limit thermostat does not trip before
the boiler reaches 114 °C, it means that it is
not working properly.In this case, the burner
will not run but the pump will.
– The screen will alternate displaying code
11 and the expanded 40 °C – 140 °C
temperature scale.
– Replace the faulty thermostat with a new
one and check its operation in accordance
with the procedure described in this
chapter.
Magnesium Anode Status Indicator
(GTA version boilers)
To fit this optional control device to monitor the
wearing of the cylinder anode, proceed as
directed in the Instructions that come with it.
Operation
Procedure prior to the first lighting
– Ensure that the heating system Flow and
Return valves (if any) are open.
– Connect the boiler to the power supply line
and check that the control panel is under
voltage.The “power on” LED (21) will light up
green.Figures 12 (G100) and 13 (G100/GTA).
In case of malfunction, please refer to the
“Fault Codes” section in the Instructions for
CCE control panels and proceed accordingly.
Whenever necessary, call Roca’s nearest
Service Centre.
– Read carefully the information contained in
the Instructions mentioned above.
– Bleed the air from the installation and radiators
and, if necessary, top up with water until the fill
pressure on the bar scale in the control panel
reaches the required level (1 bar = 10 metres).
– Vent the gas train by loosening the pressure
test point screw (22) at the gas valve inlet.
Figure 14.
– With GTA version boilers, check that the plug
on the Flexvent automatic floatvent (23) is
slack. Figure 15.
– Check that the cold water inlet cock (black
wheel) in the Flexbrane safety unit (5) is open.
Figure 3.
– Open a hot water tap to bleed the air in the
circuit.
– Check that the boiler parameters and those
for the installation (service, temperatures, etc.)
have been properly selected and set in
accordance with the Instructions for CCE
control panels.
– Open the boiler gas service cock.
First Lighting
– Check the pump(s) for correct operation and
unlock them, if necessary, by pressing a
screwdriver into the slot on the shaft-end and,
at the same time, turn it.
– Check the burners for correct operation.
– Check that there are no flue gas leaks and
that radiators reach the required temperature.
CentralHeating ServiceOnly(NOTin
GTA version boilers)
During demand for heating:
– The symbol flashes slowly.
– The burner runs until the boiler temperature
matches the factory-set value, i.e. 60 °C. Refer
to the “Changing the Setpoints” section in the
Instructions supplied with the control panel.
– The pump runs as long as the boiler
temperature is higher than the programmed
“Min. Heat.Temp.” and stops working when its
value drops 7 °C below the “Min.Heat.Temp.”.
When demand for heating stops:
– The symbol remains steady.
– The burner if OFF.
– The pump runs as long as the boiler
temperature is equal to or lower than the “Min.
Heat. Temp.” or 2 minutes after burner shut-
down.
DomesticHotWaterServiceOnly(GTA
version boilers)
The symbol in the top display window is
permanently ON.
1 – With no production of Domestic Hot Water
(“no Domestic Hot Water” programme or
with the cylinder water hot already):
– The symbol in the display window is
permanently ON.
– The burner and pumps do not operate;
but they do for maintenance.
2 – With Domestic Hot Water production
(“Domestic Hot Water” programme or with
the cylinder water not yet hot):
– The symbol flashes slowly. Production
of domestic hot water begins when the
cylinder water temperature drops 2 °C
below the set value (the factory setting is
70 °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.”
Combined Central Heating and DHW
Service (GTA version boilers)
Both the and symbols are displayed.
When the unit starts operating, the water in the
boiler is cold. The symbol flashes and the
symbol is permanently ON.
During demand for Domestic Hot Water,
operation will be as described in the previous
section under “Domestic Hot Water Service
Only”.
When demand for Domestic Hot Water stops
(but not for Heating):
– The symbol will flash slowly, but not the
symbol.
– 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 7 °C below the “Min. Heat.
Temp.”
When demand for Heating ends, the and
symbols will stop flashing. 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.
Checking the Condition of the
Sacrificial Anode (GTA boilers)
Proceed according to the Instructions that are
delivered with it. If the pointer reaches the red
area when the button is pressed, replace
the spent anode immediately.
Changing theType of Gas
It must be carried out by a qualified professional.
This can be:
1 – From Natural Gas to LPG
2 – From LPG to Natural Gas
– Cutoff thepowerandgas suppliestothe boiler.
– Remove the front casing cover as directed
under “Electrical Connection”.
– Remove the 3-4 injectors (24) from the burner
holder manifold using a 22AF spanner and
replace them with the appropriate ones for
the new gas, as shown in the table “Number
of Injectors and Size” in the “Main Features”
section. Fig. 14.
- From natural gas to LPG, Remove the bolts
that secure the flange (25), tighten the
pressure regulator screw firmly and fit the
diaphragm suitable for the new gas.
- From LPG to natural gas, Remove the bolts
that secure the flange (25), remove the
diaphragm and adjust the pressure regulator
according to the “Gas Pressure” table in the
Technical Features section.
– Reassemble in reverse order.
– Carry out a test for gas-tightness with soapy
water.
– Stick the label corresponding to the new gas
on the burner holder manifold.
Important Recommendations
– If the boiler is located in a frost-risk area, some
anti-freeze product should be added to the
water in proportion to the minimum outside air
temperature of the place.
– Werecommend thatthe properties ofthe water
in the system be as follows:
pH: 7.5 - 8.5
Hardness: 8 - 12 French degrees*