Swegon RX/HC Manual Download Page 4

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.

Summary of Contents for RX/HC

Page 1: ...ic air heater Option 3 Reversing the media circuit air recirculation section RX HC 1 1 Installation See the separate installation and maintenance instructions to install RX HC See the separate installation instructions to install the air recirculation section RX HC if used 2 Material specification Air handling unit with integrated reversible heat pump GOLD RX HC For defrosting according to option ...

Page 2: ...rt sequence 3 3 Stop of RX HC air handling unit When stopping the GOLD air handling unit operation of the reversible heat pump is shut down immediately Post cooling of the refrigerant circuit and electric air heater for defrosting if fitted is carried out After cooling is in progress two minutes after the last operation of the compressor or electric air heater 3 4 Temperature regulation The heat p...

Page 3: ... compressor is regulated to follow the tempera ture requirement At a temperature requirement below 62 5 the speed controlled compressor is run at 25 of max speed and the on off compressor is operational When the temperature requirement decreases below 50 the on off compressor shuts down and the speed controlled compressor is regulated to follow the tempera ture requirement At a temperature require...

Page 4: ...ry 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...

Page 5: ...esh air freezing occurs with varying speed and behaviour The pressure drop across the exhaust coil is measured to detect the defrosting requirement or stop ongoing defrosting Defrosting starts when the pressure drop exceeds a specific limit When the pressure drop falls below another lower limit defrosting stops At defrosting with recirculation the recirculation damper have a finishing sequence for...

Page 6: ...ntrol card IQlogic Control card iPro cooling circuit control Pressure sensor for pressure drop measurement over the cooling circuit s exhaust air coil function selector switch in D position Temperature sensor for density cor rection of the airflow The sensor is placed between the coil and fan in the exhaust air supply air Temperature sensor for density cor rection of the airflow The sensor is plac...

Page 7: ... P1 COM POWER IQlogic 1 2 3 4 5 6 7 8 9 10 11 12 S S C 13 NO 14 C 15 NO 16 17 18 19 20 G 21 G0 22 Com 1 Heat Cool Com 2 28 30 G G0 Y U G G0 31 32 P G0 G G0 1 2 1 2 1 2 8 9 G G0 Communication cable to the control unit of the air handling unit where it is connected to one of the outlets for COM 6 11 The function selector switch must be set to position 5 Outdoor air damper Exhaust air damper Air reci...

Page 8: ...activated by selecting the required accessory from the menu HC defrosting accessory Set the required heating and cooling function standard or comfort Set the required values for outdoor temperature limits for heating and cooling Set the required values for airflow limits for supply air and extract air Calibration is carried out at the factory If recalibration is required this can be carried out by...

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