GB.GOLDSK509.091101
We reserve the right to alter specifications without notice.
32
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INSTALLATION
FUNCTIONS
*FUNCTIONS*
TEMPERATURE
AIR FLOW/PRESSURE
FILTER
OPERATION
HEATING
COOLING
HUMIDITY
ReCO
2
IQnomic Plus
ALL YEAR COMFORT
CONTROL Optimize
8.6 Heating
8.6.1 Heat exchanger
8.6.1.1 Defrosting the rotary heat exchanger
In environments where the extract air can occasion-
ally be humid, the defrosting function can be acti-
vated to protect the heat exchanger from frosting.
The function continuously monitors the condition
of the heat exchanger rotor to prevent condensate
from freezing in the rotor passages and clogging
them.
The function requires a separate pressure transducer
(preset for heat exchanger defrosting) wired to the control
unit inputs for external BUS communication and con-
nected by hoses to the pressure measuring tappings of the
unit.
See special installation instruction for the TBLZ-1-23-aa
Pressure sensor.
The pressure drop across the rotor must then be calibrated
to establish a reference pressure drop for monitoring pur-
poses. See 6.4.3 Calibration - Heat exchanger.
When the function is activated the pressure drop across
the heat exchanger is continuously measured and the
reading is compared with the calibration reading.
If the pressure drop exceeds the preset limit value, a
defrosting sequence is carried out. This involves, decreas-
ing the rotor speed to approx. 0.5 rpm to allow warm
extract air to melt possible frost.
The defrosting sequence will be cancelled when the pres-
sure drop has fallen to half the limit value. The defrosting
operates for a max permissible period of 30 minutes.
If the pressure drop has not decreased within that max
permissible period after six tries during a 24-hour period,
an alarm will be initiated.
Note that the heat exchanger performs less efficiently
while defrosting is in progress and that the supply air tem-
perature will decrease downstream of the heat exchanger.
Settings:
Value Setting Factory
range settings
Defrosting Inactive/active Inactive
8.6.1.2 Exhaust air regulation, rotary heat
exchanger
The exhaust air regulation function can be used
whenever the exhaust air temperature is not per-
mitted to be below a predetermined value.
The function controls the heat exchanger rotor speed
(efficiency) in order to limit the exhaust air temperature
to the required value. The function decelerates the heat
exchanger rotor speed from the current level, until the
exhaust air temperature drops to the preset min. permis-
sible setting.
Defrosting function with separate pressure trans-
ducers, in principle
EXTRACT AIR
*HEAT*
HEAT EXCHANGE
REHEAT
HEATING BOOST
Exhaust air regulation requires a separate temperature
sensor (TBLZ-1-58-aa; accessory) fitted in the air handling
unit exhaust air path.
See special installation instructions for the internal TBLZ-1-
58-aa temperature sensor.
Settings:
Value Setting Factory
range settings
Exhaust air regulation Inactive/Activated Inactive
Min. exhaust air -10 – + 20.0 °C 5.0 °C
temperature
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