Waterside Connections; Electrical Connections; Commissioning The Boiler; High Altitude Applicatinos - DeDietrich MCA Pro 45 Installation And Service Manual

5. Commissioning

5.2.3. Waterside connections

• Check the siphon — this must be completely filled
with clean water.
• Check that there are no leaks on the water
connections.

5.2.4. Electrical connections

• Check the electrical connections, particularly the
ground.
• Check the electrical connections to the thermostat
and the other external controls.

5.3 Commissioning the boiler

WARNING
If adapting to another gas type i.e. propane, the
gas valve must be adjusted before switching on the
boiler.

See chapter: "Gas type", page 13
1. Tilt the control box upwards again and fasten it
using the clips located at the sides.
2. Open the main gas supply.
3. Open the gas shutoff valve on the boiler.
4. Insert the boiler plug into an earthing socket.
5. Turn on the boiler using the ON/OFF switch.
6. Set the controls (thermostats, control system) so
that they generate a call for heat.
7. The start-up cycle begins and cannot be
interrupted. During the start-up cycle, the display
shows the following information: A short test where
all segments of the display are visible.
f[:xx : Software version
p[:xx : Parameter version
The version numbers are displayed alternately.
8. A vent cycle of a duration of around 3 minutes is
carried out automatically.
i
If a DHW sensor is connected and the anti-
legionella function is activated, the boiler starts
to heat the water in the DHW tank as soon as
the vent programme has been completed.
By pressing the ® button for a short time, the current
operating status is shown on the display:
Heat demand 
1 : Fan on
2 : Boiler is igniting
3 : Heating System
In addition to 0, in STAND-BY the display normally
shows the water pressure and the symbols
,  and .

MCA-Pro ISM Rv.4.1 2/2017
Heat demand stopped
1 : Post-purge
5 : Burner stop
6 : Post-circulation of the pump
0 : STAND-BY
MCA Pro 45/65/90/115
Error during the start-up procedure:
• No information is shown on the display:
- Check the mains supply voltage
- Check the main fuses
- Check the fuses on the control panel:
(F1 = 6.3 AT, F2 = 2 AT)
- Check the connection of the power cable to the
connector X1 in the instrument box
• A fault is indicated on the display by the fault
symbol c and a flashing fault code.
- The meaning of the error codes is given in the
error table.
- Press for 3 seconds on key Reset button to
restart the boiler.
i
If the economy setting (eco setting) is on,
then, after heating system operation, the
boiler will not start to run for hot tap water
production.
DANGER
In the standard configuration the MCA Pro series
boiler can supply water temperatures up to 170°F,
when using a PVC flue system. A proper anti-
legionella functionality cannot be guaranteed when
the MCA Pro boiler is used in conjection with PVC
venting system.
5.3.1 High Altitude Applications
The boiler is supplied from the factory with fans speed
that are established for correct combustion from sea
level to a maximum of 700m/2300ft. For altitudes
above 700m/2300ft. to a maximum of 1370m/4500ft,
fans speed need to be adjusted to the following
specifications below.
Fan speed adjustment for altitudes from 700m/2300ft.
to 1370m/4500ft
High fire fan speed settings should not be changed.
Fan speed setting altitude application
Gas type Natural gas
low fire
MCA Pro 45 1750
MCA Pro 65 1800
MCA Pro 90 1800
MCA Pro 115 2150
Propane
start low fire start
2800 1750 2800
2800 1800 2800
2800
Propane not available
2800 2150 3100
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