Swegon Gold is a versatile air handling unit designed for ensuring the correct air quality or air temperature by recirculating extract air and minimizing the inflow of outdoor air flow. It has various functions including:
- ReCO2: This function ensures optimal air quality by controlling the recirculation and outdoor air dampers based on CO2 levels and temperature.
- Heating Boost and Cooling Boost: These functions provide increased supply airflow for heating or cooling loads.
- Air Quality Sensor: The unit can be equipped with an air quality sensor to measure CO2 levels and adjust the air handling accordingly.
Swegon Gold is a versatile air handling unit designed for ensuring the correct air quality or air temperature by recirculating extract air and minimizing the inflow of outdoor air flow. It has various functions including:
- ReCO2: This function ensures optimal air quality by controlling the recirculation and outdoor air dampers based on CO2 levels and temperature.
- Heating Boost and Cooling Boost: These functions provide increased supply airflow for heating or cooling loads.
- Air Quality Sensor: The unit can be equipped with an air quality sensor to measure CO2 levels and adjust the air handling accordingly.
GB.RECO2.101010
We reserve the right to alter specifi cations. www.swegon.com 1
Function Guide for the GOLD,
ReCO2
1. General
The ReCO2 function is designed for ensuring the correct
air quality or air temperature, by means of recirculating
extract air and minimizing the infl ow of outdoor air fl ow.
The function can be used in ventilation systems in which
recirculated air intermixture is acceptable.
The function implies that outdoor air damper and damper
in air recirculation section, are provided wih modulated
damper actuator.
Lowering the outdoor air and exhaust air fl ows as well as
lowering the speed of the extract air enables the unit to
consume less power. Special air quality sensors continu-
ously measure the air quality of the ventilation system.
The ReCO2 function can be used in size 12-120 GOLD RX
units, and in size 35-80 GOLD CX units.
The function can, together with the air recirculation
damper, be set for controlling the CO2 content and/or the
temperature.
ReCO2 – CO2. The control can be set to control the recir-
culation and outdoor air dampers only, or both regulate
the recirculation and outdoor air dampers + increase the
airfl ow rate.
ReCO2 – temperature. The control of the recircula-
tion damper can be set for cooling sequence, heating
sequence or both, and to work prior to post heating/
cooling control or after post heating/cooling control (see
section Adjustment).
ReCO2 – CO2 and ReCO2 – temperature. The control can
be set to control air quality and temperature at the same
time. If the air quality or the temperature will be domi-
nant depends on which one of them requiring the largest
amount of outdoor air fl ow.
The Heating Boost and Cooling Boost functions can be
activated if increased supply airfl ow for a heating or cool-
ing load is required.
2. Material Specifi cation
Requirements:
Air handling unit, GOLD RX 12-120
or GOLD CX 35-80
Air recirculation section with damper, modulated
damper actuator and spring return. TBBR/TCBR
Outdoor air damper, modulated damper
actuator and spring return. TBSA/TCSA
Set of components for ReCO2 TBLZ-1-51
Consists of: IQnomic Plus, TBIQ-2-1
Communication cable, BC1-1 (L=250mm)
Pressure sensor, TBLZ-1-23
Communication cable, TBLZ-1-26-03 (L=3m)
Hose, transparent, (L=2m)
Air quality sensor ELQZ-2-504
(if the CO2 function is used) alt. ELQZ-2-504-2
TBSA/
TCSA
GCA 321.IE
Damper
actuator
IQnomic Plus
GMA 161.IE
TBBR/TCBR
TBSA/
TCSA
GB.RECO2.101010
We reserve the right to alter specifi cations.
2 www.swegon.com
CO2
3. Operation
The ReCO2 function requires that a modulating actuator
on the recirculation damper and a modulating actuator for
outdoor air damper be wired to an IQnomic Plus module.
The CO2 function also requires an air quality sensor wired
to the IQnomic plus module.
The function always requires wiring a TBLZ-1-23 pressure
sensor to the bus connection, and connecting hoses to the
tappings provided in the supply airfl ow path for measuring
the pressure drop across the heat exchanger. The outdoor
airfl ow is calculated on the basis of readings of the pres-
sure drop across the heat exchanger
From stop, start the air handling unit as normal and with
the recirculation damper closed and the outdoor air
damper open.
When the start up phase is completed, the selected ReCO2
function takes over control.
ReCO2 – temperature. The ordinary temperature control
mode continues to operate and the recirculation of extract
air with a decrease in the amount of outdoor air are
switched in at selected places in the control sequence.
ReCO2 – CO2. The setpoint of the outdoor airfl ow is
reduced, if the air is of suffi ciently good quality: First by
opening the recirculation damper for intermixing recircu-
lated air. If the outdoor airfl ow is still too high when the
recirculation damper is completely open, the outdoor air
damper begins to close.
The control adjusts the fl ow setpoint of the extract air fan
down to the same percentage as the outdoor airfl ow, in
order to maintain the balance between the exhaust air
and outdoor air.
If the air quality becomes worse, controller fi rst opens the
outdoor damper and then closes the recirculation damper.
ReCO2 – CO2+fl ow, function in the same way as ReCO2
– CO2, except that the increase in fl ow is added in the con-
trol sequence.
If the air quality still isn’t adequate, when the outdoor
air damper is fully open and the recirculation damper is
fully closed, the airfl ow setpoint is increased for both the
supply air and the extract air fans. This increases the air
volume in order to achieve a higher rate of air change with
outdoor air.
ReCO2 – CO2 and ReCO2 – temperature
If both functions are active at the same time, they'll oper-
ate individually as earlier described.
The dominating function, that will control the dampers
in any given moment, is the one requiring the smallest
amount of recirculation (largest amount of outdoor air
fl ow) .
Important!
To ensure that a certain degree of air change with outdoor
air will always occur, a “min. outdoor airfl ow” through
the heat exchanger and a “min. exhaust airfl ow” gener-
ated by the extract air fan can be preset via the hand-held
micro terminal.
For calculation of appropriate "min. outdoor airfl ow" to a
specifi c installation, pls. contact your sales offi ce.
If the min. outdoor airfl ow is set so high that that it is
equal to the current airfl ow, this will block the air recircu-
lation function.
GB.RECO2.101010
We reserve the right to alter specifi cations. www.swegon.com 3
4. Electrical connections
IQnomic Plus module
Pressure sensor
0
1
2
3
4
5
6
7
8
9
Communication cable to the
control unit of the air handling
unit, where it must be con-
nected to one of the connec-
tions for Internal EIA-485.
Connect the hose to the nipple
in the side of the heat exchanger
facing the supply air fan.
Connect the hose to the nipple
in the side of the heat exchanger
facing the outdoor air fi lter.
The function selector switch
must be set to the 0 position.
Pressure sensor illustrated
with the cover removed.
+-
1632457 12981011
13 181514 16 17 19 242120 22 23
L1 L2
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
132
20
21
60
61
*
* The conductors for supplying 24 V AC power can be con-
nected to Terminals 60 (G) and 61(G0) in the control unit of
the air handling unit.
** For CO2-sensors delivered by Swegon, ELQZ-2-504 or
ELQZ-2-504-2, see resp. instruction.
*** If the outdoor air damper does not have spring return,
it is not necessary to wire the 24 V (G) supply voltage
across the control relay (20-21).
Recirculation damper/
Internal damper.
Outdoor air damper/External damper
CO2 sensor
ELQZ-2-504
The function
selector switch
must be set to
the 0 position
GOLD
Control
unit
*
***
Communication cable to the control unit
of the air handling unit, where it must be
connected to one of the connections for
Internal EIA-485.
GB.RECO2.101010
We reserve the right to alter specifi cations.
4 www.swegon.com
INSTALLATION
FUNCTIONS
*FUNCTIONS*
TEMPERATURE
FLOW/PRESSURE
FILTERS
OPERATION
HEATING
COOLING
MOISTURE
ReCO2
IQNOMIC PLUS
*ReCO2*
FUNCTION OFF/ON
SETTINGS
CO2 FUNCTION
TEMP FUNCTION
DEACTIVATE
CO2
CO2 + FLOW
*ReCO2*
COOLING: COMFORT
HEATING: ECONOMY
5. Adjustment
5.1 To activate
For basic particulars on how to handle the hand-held
micro terminal, see the Operation and Maintenance
Instructions for the GOLD.
The ReCO function2 must be activated, under INSTALLA-
TION – FUNCTIONS – ReCO2 in the hand-held terminal.
Select the ReCO2 function desired, under ReCO2 - FUNC-
TION OFF/ON.
Select the CO2 FUNCTION and/or TEMP FUNCTION here.
For CO2 FUNCTION, select CO2 or CO2 + FLOW.
For TEMP FUNCTION, select whether recirculation for
COOLING and HEATING respectively, shall apply to COM-
FORT or ECONOMY in the temperature sequence.
COMFORT involves switching in recirculation after cooling
and postheating respectively.
COMFORT involves switching in recirculation prior to cool-
ing and postheating respectively.
CO2 FUNCTION
TEMP FUNCTION
GB.RECO2.101010
We reserve the right to alter specifi cations. www.swegon.com 5
*ReCO2*
FUNCTION OFF/ON
SETTINGS
*ReCO2*
CO2 SIGNAL MIN
OUTDOOR AIR 0.100m3/s
MIN EXHAUST AIR
0.100m3/s
5.2 Limitations
Under SETTINGS, select the setpoint required for the CO2
signal and the fl ows required, MIN OUTDOOR AIR and
MIN EXHAUST AIR, see also the Installation Instructions for
the ELQZ-2-504 Air Quality Sensor.
5.3 Calibration
In order for the air handling unit to operate correctly, the
pressure drop across the heat exchanger must be cali-
brated in relation to the airfl ow through the unit. See the
Operation and Maintenance Instructions for the GOLD.
Calibration can be activated at user level under FILTERS.
Start the air handling unit. The fans in the air handling
unit will then operate at high speed for approx. 3 minutes
while pressure drop is being calibrated.
FILTERS
*FILTERS*
READINGS
CALIBRATION
*FILTER CALIBRATION*
STD.FILTER
PREFILTER
HEAT EXCHANGER
*HEAT EXCHANGER*
CALIBRATION H EXCH
CALIBRATION ReCO2
GB.RECO2.101010
We reserve the right to alter specifi cations.
6 www.swegon.com
6. Performance checks
IQnomic Plus module:
Light-emitting diode L2 lit with a steady glow indicates
that power is being supplied from the GOLD unit’s control
unit.
A fl ashing light-emitting diode L1 indicates correct com-
munication with the GOLD unit’s control unit.
Pressure sensor:
Light-emitting diode L2 lit with a steady glow indicates
that power is being supplied from the GOLD unit’s control
unit.
A fl ashing light-emitting diode L1 indicates correct com-
munication with the GOLD unit’s control unit.
If the functions are activated but the accessories have not
been connected properly, an alarm will be initiated. See
the Operation and Maintenance Instructions for the GOLD
unit for a description of each alarm.
0
1
2
3
4
5
6
7
8
9
L1 L2
1632457 12981011
13 181514 16 17 19 242120 22 23
L1 L2
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
L1 L2
-
1
-
2
-
3
-
4
-
5
-
6
Swegon Gold is a versatile air handling unit designed for ensuring the correct air quality or air temperature by recirculating extract air and minimizing the inflow of outdoor air flow. It has various functions including:
- ReCO2: This function ensures optimal air quality by controlling the recirculation and outdoor air dampers based on CO2 levels and temperature.
- Heating Boost and Cooling Boost: These functions provide increased supply airflow for heating or cooling loads.
- Air Quality Sensor: The unit can be equipped with an air quality sensor to measure CO2 levels and adjust the air handling accordingly.
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