EMW90HDNC1U Air-cooled Chiller
Item Control Logic Description
Heating
Heating demand ≥ 50%: the
heating is started.
Heating demand (%)= (heating set point - actual
control temperature) / heating sensitivity * 100%
When the heating set point is 10°C and the
heating sensitivity is 3°C, the heating start point is
8.5°C (10°C- 3°C*50%=8.5°C), and the heating
stop point is 11.5°C (10°C+ 3°C *50%=11.5°C).
When the outlet coolant temperature is used as
the actual control temperature:
When the outlet coolant temperature is ≤ 8.5°C,
the chiller will turn on the electrical heaters.
When the outlet coolant temperature is
≥11.5°C, the chiller will stop the electrical
heaters.
Heating demand ≤ -50%, the
heating is stopped.
The actual control temperature is configurable and supports the coolant outlet temperature and the cell temperature
sent by the host computer.
Refrigeration/heating set point and refrigeration/heating sensitivity can be configured according to actual planning.
2.2.3 Operating Mode
The chiller supports the operating modes shown in Table 2-4.
Table 2-4 Operating mode
Operating Mode Description
Stop
When the chiller is working in the Stop mode, except for the electronic control
part to keep running, other parts such as the internal circulating pump are not
running.
Cycle
When the chiller is in the Cycle mode, only the circulation pump runs, and the
pump runs at a low speed, and other devices are not running.
Cool
When there is a refrigeration demand, the refrigeration function is turned on,
and the internal circulating pump, compressor and fans are all running, and
the pump runs at a high speed.
When there is no refrigeration demand, the compressor is turned off, the
fans stop running, and the internal circulating pump runs at low speed.
When there is heating demand, only the internal circulating pump is turned
on. The pump is running at low speed, and other components such as
electrical heater is not running.
Heat
When there is a heating demand, the heating function is turned on, the
internal circulating water pump and the electrical heater run, and the water
pump runs at a high speed.
When there is no heating demand, the electrical heater is turned off and the
internal circulating water pump runs at low speed.
When there is a cooling demand, only the internal circulating pump is turned
on. The pump is running at low speed, and other components such as the
compressor are not running.
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