Eliwell ECH 200BD "Adaptive" - Protection in Cooling Mode; Protection in Heating Mode; Notes; Example

ECH 200 BD
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7.1.4 Protection in Cooling mode
If the output temperature is AI2 < C09 during a generic cycle n, the controller performs the following operations:
• Switches the compressor(s) off.
This adjustment can be considered a pre-threshold of the anti-freeze alarm (the cycle ends without generating alarms) if
the adaptive function yields a very low actual set point.
It is advisable to use C09 > A11.
7.1.5 Protection in Heating mode
If the output temperature is AI2 > C10 during a generic cycle n, the controller performs the following operations:
• Switches the compressor(s) off.
This adjustment can be considered a pre-threshold of the anti-freeze alarm (the cycle ends without generating alarms) if
the adaptive function yields a very low actual set point.
The setting of C10 should be chosen according to the high pressure protections in use (pressure switch calibration, type of
coolant used...).
7.1.6 Notes
• The adaptive algorithm is reset (i.e. the original set point is restored) in the conditions listed above and when the
controller is switched off (i.e. not after a manual or remote off or standby condition).
• If the compressor switches off due a thermal switch or equivalent alarm and ET<MT, the actual offset and set
point are updated as if the cycle had been completed (the cycle that follows this alarm will adopt a different set
point).
• If the compressor switches off due to the transition between modes, for example from standby to remote off
(from digital input), and ET<MT, the offset is updated as if the cycle had been completed . The cycle that
follows this alarm will adopt the set point selected for the mode +/- offset, depending on the mode).
7.1.7 Example
• Set heat = 45.0 °C
• Set cool = 12.0 °C
• C01 = 18 S*10 (3 minutes)
• C02 = 36 S*10 (6 minutes)
• C08 =1
• C09 = 4 °C
• C10 = 50 °C
• C11 = 0.5 °C
• C12 = 30 S*10 (5 minutes)
• C13 = 0.2 °C/(10*s)
The running of the compressor for two minutes will yield the following values:
• Minimum time:
MT = C02 –C01 = 36-18 = 18*10*s (3 minutes)
• Actual time:
ET = 12 (12*10*s = 2 minutes)
• Adaptive offset
AO = (MT – ET) * C13 + C11 = (18-12)*0.2 + 0.5 = 1.7°C
• If Heating Mode:
SET(1) = SET(HEA) + AO(1) = 45 + 1.7 = 46.7°C
• If Cooling Mode:
C12
C12
O
FF
O
N
SET
Set+Ist
A
O
C
omp.
AI1
C11
set effettiv
o