5-4-1 Electrical auxiliary unit: P6 = 1 or 2
a -
Operating limits
Auxiliaries may be used if the outdoor temperature
is below < P7 (trigger threshold).
Control is carried out on interstage differential P21.
Example: P21 = 2°C and water setpoint P42 = 40°C
- The compressor starts at 38°C
- Electric stage 1 starts at 36°C
- Electric stage 2 starts at 34°C
Microconnect can also manage a third electric
stage (usually not wired). This third stage
is enabled only when the compressor is not available.
b -
Terminal unit display
5-4-2 Using a boiler as a backup
Foreword
Corrosion of heating sources
Heating sources, such as those made of steel, are susceptible to corrosion. Please contact your boiler manufacturer to establish
whether the heating source is compatible with Microconnect control.
A few recommendations
- Do not run the burner and the heat pump at the same time when the water temperature is below 40°C. If P6 = 5 and you are
in doubt, adjust P7 and P9 to the same value.
- Do not short-circuit the boiler corrosion protection systems (e.g. heating circulator kept off until the burner raises the heating
source temperature to over 40°C).
a -
Boiler operated by its own control system: P6 = 3 or 4
Application type: boiler with an advanced electronic control system.
When P6 is set to 3 or 4, the Microconnect controller only provides a ‘boiler On’ contact. This contact (terminal block J1 - termi-
nals 1 and 5) remains closed once the outdoor temperature drops below the value of P9 or a fault occurs on the heat pump. The
boiler burner is then controlled by the boiler’s control system.
Heat pump and boiler operating ranges:
Note: the boiler and heat pump are turned off if the outdoor temperature is greater than P9 and the water return temperature is
above 49°C.
Miscellaneous:
•
Setting P34 may be used to turn off the circulator.
P34 = 0:
circulator off if boiler on.
Moreover, a d3 fault (water flow rate fault) must not prevent the boiler from operating. Accordingly, the boiler is still
authorised to come on even if this fault appears.
P34 = 1:
default value - continuous circulator operation.
•
Maximum water return for boiler backup: 70°C.
•
If P6 = 3 or 4 and if the outdoor temperature is less than P9.
Terminal display when the outdoor temperature is less than P9 and only the boiler is authorised.
The control setpoint is displayed in all other cases.
50
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55˚C
38˚C
-15˚C
0˚C
49˚C
P48
55˚C
Operating limits
Heat pump and auxiliaries off
Auxiliaries only
Auxiliaries only
Heat pump off
Auxiliaries
authorised
Heat pump off
Auxiliaries not authorised
Heat pump
operation low limit
Programmed auxiliary
trigger threshold
W
ater retur
n temper
ature (°C)
Heat
pump
+
Auxiliary
Maximum
temperature
back to
heat pump
Max. heat pump
operation authorisation temperature
Outdoor temperature
Heat pump only
Boiler operation authorised symbol
Terminal display
Electric stage 1 on indicator
Electric stage 2 on indicator
Electric stage 3 on indicator
(takes over from compressor)
P48
P40
49˚C
-15˚C
0˚C
70˚C
38˚C
70˚C
Heat pump and boiler off
Boiler
only
Boiler only
W
ater retur
n temper
ature (°C)
Heat pump off
Boiler not authorised
Heat pump
only
Maximum temperature
back to heat pump
Max. heat pump operation
authorisation temperature
Outdoor temperature
80 s time delay
during shift
Operating limits
