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21 MANAGEMENT OF THE BACK-UP BOILER
If P111 = Boiler
Management under normal operation:
- If the air temperature
≥ P226: heat pump alone
- If the air temperature < P226: heat pump and boiler. If a call is
made for control. The thermodynamic control stages are the
first stages.
- If the air temperature < P225: heat pump shut off and boiler
turned
on.
Management of the electric auxiliary heaters when the thermodynamic control stage is shut off by a setpoint corrected by the
discharge protection:
- The boiler contact (terminals 2-3 on terminal block J3 on the
main board) is closed, the outdoor air temperature at the time of
closing is stored in memory. P226 takes on the value of the
outdoor temperature if it is lower.
- The boiler is set to the initial setpoint if P131 (setpoint
adjustment based on outdoor temperature) = No. It is to the
calculated setpoint if P131 = Yes
- The thermodynamic stages adjust to the setpoint
corrected by the discharge temperature protection.
- Whether the machine is on or off, the corrected setpoint will
increase by 1°C for an equivalent rise in the air temperature until:
. Initial setpoint if P131 = No
. Calculated setpoint if P131 = Yes
- The boiler relay is open when the air temperature > P226 + 2.
Management of the boiler when the machine has been shut off by a general fault:
- Boiler contact closed
- Control with a minimum setpoint P135 = 50°C
By default, this minimum setpoint must be adjusted based on the
technology of the boiler.
Management of the boiler when the machine has been shut off by a water flow fault:
(Depending on state of P27: pump controlled by boiler operation)
- If P27 = Yes, boiler operation authorised.
- If P27 = No, the boiler is shut off.
22 MASTER/SLAVEE CONTROL
22.1 Case of two parallel-connected machines
For a master/slave setup involving two parallel-connected machines, the machines must be connected by a bus link and one must be
designated as the master machine in control of the slave machine.
Menu 12 (Master/Slave) appears when parameter P28 is set to
„Yes‟.
1 2 - M A S T E R / S L A V E
Setpoint
Boilers only
Heat pump
and boiler
Heat pump only
Setpoint
= f (Text) in °C
Outdoor air temperature (°C)
Setpoint
= f (Text) in °C
Outdoor air temperature (°C)
Minimum boiler setpoint
Setpoint
P123
or
p124
Summary of Contents for Magister 2 Series
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