84
20 MANAGEMENT OF THE AUXILIARY HEATER BOARD AND THE ELECTRIC AUXILIARY
HEATERS
The auxiliary electric heater board is the ADDitional board 1 with the rotary switch
set to position 2.
It is used to obtain up to four additional control stages in heating mode.
Example:
When used on a unit with two control stages, the board brings the total number
of stages to six (two thermodynamic stages and four electric stages).
Although the electric stages are managed as control stages, the last control stages
will turn on last.
The electric stages are turned on if:
- the thermodynamic power is insufficient
- faults occur on the compressor stages
- the outdoor temperature is less than P225
- the water return temperature is too low to allow defrosting
The electric stages are shut off if a water flow fault occurs.
The auxiliary electric heater board has three separate on/off inputs:
- Input 1 → ADDitional board 1, auxiliary electric heaters used, terminal block J4
between terminals 2-3 (if the input is open, the electric auxiliary heaters are shut
off by fault 1 and the corresponding message appears).
- Input 2 → ADDitional board 1, auxiliary electric heaters used, terminal block J4
between terminals 4-5 (if the input is open, the electric auxiliary heaters are shut
off by fault 2 and the corresponding message appears).
- Input 3 → ADDitional board 1, auxiliary electric heaters used terminal block J4
between terminals 1-2
Value of P113:
- If P113 = DISABLED, the input is disabled regardless of its state.
- If P113 = LOAD SHEDDING, two cases apply:
1) The input is open: the electric auxiliary heaters operate normally
2) The input is closed: the electric auxiliary heaters are turned off
- If P113 = OVERRIDE:
1) The input is open: the thermodynamic stages and the electric auxiliary heaters
operate normally
2) The input is closed: the thermodynamic stages are turned off
The outputs always close in the same order (1, 2, 3, 4) and always open in
the reverse order (4, 3, 2, 1).
Management of the electrical auxiliary heaters under normal operation:
- If the air temperature ≥ P226: heat pump alone
- If the air temperature < P226: heat pump and electric auxiliary heaters. If a call is made for control, the thermodynamic control stages are the
first stages.
- If the air temperature < P225: the heat pump is shut off and only the electric stages operate.
Management of the electric auxiliary heaters when the thermodynamic control stage is shut off by a setpoint corrected by
the discharge protection:
- The electric stages take the place of the thermodynamic stages
and become the first control stages, and the outdoor air
temperature at that exact moment is stored in memory.
- The auxiliary heaters are set to the initial setpoint if P131
(setpoint adjustment based on outdoor temperature) = No. They
are set 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
- When the air temperature is > than the air temperature stored in
memory + 2, the thermodynamic stages revert to being the first
control stages and the electric stages are the last and adjust to
the original setpoint:
. Initial setpoint if P131 = No
. Calculated setpoint if P131 = Yes
Management of the electric auxiliary heaters when the machine is shut off by a general fault:
The electric stages take the place of the thermodynamic stages.
Electric
auxiliaries
only
Heat pump
and electric
auxiliaries
Setpoint
= f (Text) in °C
Outdoor air temperature (°C)
Bus link with
CONNECT 2
board
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