GB.GOLDSKE.160901
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We reserve the right to alter specifications without notice.
6.4.13.7 Automatic functions
GOLD RX (rotary heat exchanger)
Purging function
Purging is an automatic function that prevents the rotary heat
exchanger from standing still in the same position for a longer
period when no heating is necessary.
Purging operation is activated when the AHU is operating but
the heat exchanger rotor is not rotating. The heat exchanger
rotor then rotates for 10 seconds every 10 minutes to purge its
surfaces clean of impurities.
Calculation of the efficiency
The efficiency is calculated and displayed (0 – 100%).
Calculation of recovered energy
Recovered sensible energy is calculated and the values are dis-
played (instantaneous and accumulated).
Cooling recovery
Cooling recovery is an automatic function that helps the air han-
dling unit on a cooling load and high outdoor air temperature
to utilize the relative "cooling energy" that can be indoors. The
heat exchanger rotates at max. speed and in this way recovers
the relative cooling energy or chilliness in the extract air.
The conditions for this function to be activated are that there is a
cooling demand and that the outdoor temperature is 1 °C higher
than the extract air. The function stops when the cooling load
ceases to exist or when the outdoor temperature is the same as
that of the extract air.
Overtime heat exchanger operation
If the AHU stops, the heat exchanger automatically continues to
recover heat for about 1 minute.
It takes a little time for the fans to stop rotating after a stop has
been ordered and this prevents the supply air from chilling the
premises.
GOLD CX/SD (coil heat exchanger)
Pump control, coil heat exchanger
The pump of the pipework package starts when heat recovery is
needed. If heat recovery is not needed for more than 24 hours,
the pump is exercised once a day.
Anti-frost protection
In cold weather, and if the extract air is humid, there is risk of
frosting in the coil heat exchanger. The GOLD CX/SD is equipped
with anti-frosting protection.
The temperature of the liquid circulated to the extract air coil and
the humidity in the extract air are measured.
Taking the humidity into consideration, the control system
calculates the lowest permissible temperature without risk of
frosting inside the coil. The valve in the pipework package is then
regulated to prevent the circulated liquid from dropping below
this temperature.
GOLD PX (plate heat exchanger)
In cold weather, and when the extract air is humid, there is risk
of frosting in the plate heat exchanger. The GOLD PX is therefore
equipped with anti-frost protection.
Anti-frost protection, standard
The pressure drop across the heat exchanger and the outdoor air
temperature are measured.
With consideration given to the pressure drop across the heat
exchanger and the outdoor air temperature, the control system
regulates dampers for bypass and heat exchanger (interlinked) in
order to prevent the formation of frost.
RECOfrost anti-frost protection
The pressure drop across the heat exchanger, extract air tem-
perature, moisture content in the extract air and outdoor air
temperature are measured.
With consideration given to the pressure drop across the heat
exchanger, the extract air temperature, the moisture content
in the extract air and the outdoor air temperature, the control
system individually regulates dampers for bypass and the heat
exchanger for section-by-section defrosting without the forma-
tion of frost.
Calibration/Optimization
6.4.13.6 Calibration/Optimization (GOLD PX)
Defrosting, Standard
When the air handling unit is started up or if needed, a
calibration should be carried out. When calibration is in
progress, the air handling unit's limit values for alarms
and defrosting are calculated.
Defrosting, RECOfrost
When the air handling unit is started up or if needed, a calibra-
tion should be carried out. When calibration is in progress, the
air handling unit's limit values for alarms and defrosting are
calculated.
When the air handling unit is started up or if needed, bypass
optimization should be carried out. When bypass optimization is
in progress, the damper positions of the bypass are optimized.
Calibration and bypass optimization can be activated to occur
at the same time or individually. If they are activated individually,
whichever one is activated first is of no importance.
Settings:
Value Setting
range
Factory
settings
Calibration On/Off Off
Bypass optimization
(RECOfrost only)
On/Off Off
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