GB.FUNKRXHC.180907
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3.5 Stabilization
In certain circumstances, there is a need to stabilise opera-
tion of the refrigerant circuit and the temperature control
for GOLD.
During stabilization, operation of the refrigeration circuit
is forced to be between MIN-100% of the compressor
speed, regardless of the temperature control requirement.
The stabilisation time is normally 4 m any time
between sending the start request of the refrigeration
circuit and the actual start of compressor operations. If the
cooling circuit is (or recently been in) in operating mode
Adapted operations, the stabilisation time is extended to 8
minutes.
Stabilization starts when one of the following occurs:
• The refrigerant circuit starts in stopped mode
• Defrosting is complete
• Oil return is terminated
• The number of compressors in operation is changed
(except when the number changes from one to zero).
Operations return to normal mode after stabilization is
complete and is controlled between MIN-100% according
to section 3.4 Temperature control.
Stabilization stops when one of the following occurs:
• Stop of the GOLD air handing unit
• Defrosting requirement occurs (see section 3.9)
• Oil return starts (see section 3.8)
3.6 Comfort function
The comfort function is possible to select for heating and/
or the cooling function.
When there is a need of low cooling/heating capacities,
the lowest compressor speed will be too high, the func-
tion prioritises comfort before economy.
If the comfort function is selected and the temperature
requirement is low (the corresponding compressor oper-
ation is lower than MIN level), comfort mode is enabled.
Operation of the reversible heat pump is then locked
to MIN level of the compressor speed. The rotary heat
exchanger is allowed to regulate to maintain the required
supply air temperature. If instead the temperature require-
ment exceeds MIN level, operations return to normal
mode.
If any of the following occurs the comfort function is can-
celled and operation of the reversible heat pump stops:
• Stop of the GOLD air handing unit
• Time for comfort mode exceeds 30 minutes (factory
setting, can be set 5 – 30 minutes)
• Airflow limits for the supply air and/or extract air drop
below the permitted minimum limit (factory setting 40%
of the GOLD air handling unit’s maximum flow, can be set
0 – 100%)
• Outdoor temperature limits for heating or cooling func-
tion are not met (factory setting, heating -20°C, cooling
+15°C. Can be set, heating -50 – +50°C, cooling 0 –
50°C)
• The supply air temperature deviates from the set point to
such an extent that it is within 1 K from the limit value for
any of the alarms Supply air temperature above/below set
point.
• Reheating attempts to start when operations are in heat-
ing mode or reheating attempts to start when operations
are in cooling mode. This means that the rotor’s heating/
cooling capacity is not sufficient to balance the tempera-
ture and that there is an active regulation sequence after
the rotor.
3.7 Adapted operations
When the evaporation and condensation temperatures
are in a position outside of the optimal working range, the
speed of the compressor is adapted to attempt to reach
the optimal working range.
This is indicated on the hand-held micro terminal of the
GOLD unit.
3.8 Oil return
If the speed of the compressor has been below 28% for
more than 50 minutes, the speed is increased briefly to
extend the life of the compressor.
This results in a larger delivered supply air capacity than
requested. In order to avoid unnecessary system fluctua-
tions, refrigeration circuit shut-off is prevented (independ-
ent of the temperature regulator’s requirement) after the
oil return is completed. This is done by starting the stabili-
zation function.