23
Ver
. 1.0 - 11.10.10
There are four modes of the heating control
1. On/Off compressor control based on return water temperature
2. Modulating compressor control based on supply water
temperature
3. On/Off compressor control based on heating accumulator water
tank temperature
4. Modulating compressor control based on heating accumulator
water tank temperature – uses inverter
In heating control modes 2 and 4 the capacity is controlled by a PI
controller. The output is the requested capacity. The actual capacity is
formed based on the requested capacity (CapReq). The rate of actual
capacity (CapAct) change is limited to max +/-1% per second and if
evaporator sensor temperature is close to a preset value (MinTevap)
the rate of change limited according to the graph below. Gain (Gain)
and integration time (Tn) is adjustable.
In heating control modes 1 and 3 the compressor is started when
the selected temperature is below the setpoint – neutral zone. The
compressor is stopped when the temperature is above the setpoint.
When capacity exceeds a preset value (StartCap) the compressor is
started. When the capacity is lower than a preset value (Stop Cap) the
compressor is stopped. The PI controller runs continuously also during
off periods.
The compressor relay is open when the compressor is stopped.
% pr second
evaporator
sensor
temperature
Mi 2K
+2,00
-2,00
MinTevap - 2K
Functions
Содержание LMC 320
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