Cooling Mode; How The Cooling Mode Works; Description Of The Cooling Mode Types - Viessmann EVO-COOL Series Installation And Operating Instructions Manual

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7.

Cooling mode

7.1

How the cooling mode works

After switching on the unit (Standby => No; see Point 8
'First steps'), the cooling mode activates. If the unit was
only recently connected to the mains, the compressor
standstill time (usually three minutes) passes. The com-
pressor then switches on and starts the cooling process.
The condenser fan switches on at an appropriate speed
depending on the temperature at the condenser outlet.
On reaching the 'Start evaporator fan' temperature or
upon expiry of the 'evaporator fan delay', the evaporator
fan switches on. Depending on the humidity setting, the
fan runs at all times or when the compressor is switched
on (see parameter list in Point 9.3). The compressor runs
until the switch-off point is reached and re-activates
when the temperature increases to the switch-on point.
The points are determined by the desired coldroom
temperature and the hysteresis (see parameter list in
Point 9.3).
7.2

Description of the cooling mode types

Normal mode
The unit is started with 'Standby = No' then runs conti-
nuously. The cooling mode is only briefly interrupted by
the set defrost cycles.
Cooling schedule
The unit is started with 'Standby = No' then only runs at
the times approved in the cooling schedule. The cooling
mode is only briefly interrupted by the set defrost cycles.
The cooling schedule must always be programmed for a
week.
Emergency mode
The emergency switch on the unit's motherboard
(see circuit diagram) has been activated. The unit runs
without interruption and temperature regulation. The
compressor and both fans run at maximum power. The
information 'Emergency mode' appears on the display.
General notice (liability): the details of this technical documents serve for description. Consents regarding the availability of certain features or
regarding a certain purpose always require a special written agreement.
Page 50 GB
Relay
Compressor
Solenoid
valve
Bypass
Solenoid
valve
Fluid line
Temperature Cooling running
monitoring by Switch-off by
ambient air sensor ambient air sensor
Minimum
standstill time
Lead time
Compressor must
Bypass valve (sec)
have finished
Temperature
Cooling range
Hysteresis
(2 to 8 K)
Target
temperature
Compressor Compressor
on off
Temperature
Deep-freeze range
Target
temperature
Hysteresis
(-2 to 8 K)
Compressor Compressor
on off
Right reserved to make technical changes!
Time
Time
Compressor
on
Time
Compressor
on