RECO2

RECO2
GB.RECO2.130204
Function Guide for the GOLD, ReCO2
1. General
2. Material Specification
The ReCO2 function is designed for ensuring the correct
air quality or air temperature, by means of recirculating
extract air and minimizing the inflow of outdoor air flow.
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 flows as well as
lowering the speed of the extract air enables the unit to
consume less power. Special air quality sensors continuously measure the air quality of the ventilation system.
The ReCO2 function can be used in size 12-120 GOLD RX
units, and in size 35-120 GOLD CX units.
The function can, together with the air recirculation
damper, be set for controlling the CO2 content and/or the
temperature.
Requirements:
Air handling unit, or GOLD RX 12-120 GOLD CX 35-120
Air recirculation section with damper, modulated
damper actuator and spring return.
Outdoor air damper, modulated damper
actuator and spring return.
TCBR
TBSA/TCSA
TBLZ-1-51
Set of components for ReCO2 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 (if the CO2 function is used)
ELQZ-2-504 alt. ELQZ-2-504-2
ReCO2 – CO2. The control can be set to control the recirculation and outdoor air dampers only, or both regulate
the recirculation and outdoor air dampers + increase the
airflow rate.
ReCO2 – temperature. The control of the recirculation 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 dominant depends on which one of them requiring the largest
amount of outdoor air flow.
The Heating Boost and Cooling Boost functions can be
activated if increased supply airflow for a heating or cooling load is required.
IQnomic Plus
TBSA/
TCSA
GCA 321.IE
TBSA/
TCSA
TCBR
Damper
actuator
GMA 161.IE/
GCA 161.IE
We reserve the right to alter specifications.
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1
GB.RECO2.130204
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.
If the air quality becomes worse, controller first opens the
outdoor damper and then closes the recirculation damper.
The CO2 function also requires an air quality sensor wired
to the IQnomic plus module.
ReCO2 – CO2+flow, function in the same way as ReCO2
– CO2, except that the increase in flow is added in the control sequence.
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 airflow path for measuring
the pressure drop across the heat exchanger. The outdoor
airflow is calculated on the basis of readings of the pressure drop across the heat exchanger
If the air quality still isn’t adequate, when the outdoor
air damper is fully open and the recirculation damper is
fully closed, the airflow 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.
From stop, start the air handling unit as normal and with
the recirculation damper closed and the outdoor air
damper open.
ReCO2 – CO2 and ReCO2 – temperature
If both functions are active at the same time, they'll operate individually as earlier described.
When the start up phase is completed, the selected ReCO2
function takes over control.
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
flow) .
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 airflow is
reduced, if the air is of sufficiently good quality: First by
opening the recirculation damper for intermixing recirculated air. If the outdoor airflow is still too high when the
recirculation damper is completely open, the outdoor air
damper begins to close.
The control adjusts the flow setpoint of the extract air fan
down to the same percentage as the outdoor airflow, in
order to maintain the balance between the exhaust air
and outdoor air.
Important!
To ensure that a certain degree of air change with outdoor
air will always occur, a “min. outdoor airflow” through
the heat exchanger and a “min. exhaust airflow” generated by the extract air fan can be preset via the hand-held
micro terminal.
For calculation of appropriate "min. outdoor airflow" to a
specific installation, pls. contact your sales office.
If the min. outdoor airflow is set so high that that it is
equal to the current airflow, this will block the air recirculation function.
CO2
2
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We reserve the right to alter specifications.
GB.RECO2.130204
4. Electrical connections
Recirculation damper/
Internal damper.
IQnomic Plus module
Applies to GOLD size 100/120 only:
If the total load on wiring terminals 58-59
and 60-61 is higher than 16 VA,you should
wire the leads to terminals 201 (G) and 202
(G0). Wiring terminals 201-202 can be loaded
with a total of max. 48 VA.
Outdoor air damper/External damper
GOLD
Control
unit
***
1 2 3
CO2 sensor
ELQZ-2-504
20
21
60
** 61
34 5 6
7 89A
F 012
13 14 15 16 17 18 19 20 21 22 23 24
L1
The function
selector switch
must be set to
the 0 position
L2
BCDE
1 2 3 4 5 6 7 8 9 10 11 12
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.
* The conductors for supplying 24 V AC power can be connected 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).
Pressure sensor
Pressure sensor illustrated
with the cover removed.
The function selector switch
must be set to the 0 position.
01
2 34
7 89
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.
56
Connect the hose to the nipple
in the side of the heat exchanger
facing the supply air fan.
We reserve the right to alter specifications.
+
Connect the hose to the nipple
in the side of the heat exchanger
facing the outdoor air filter.
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GB.RECO2.130204
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 INSTALLATION – FUNCTIONS – ReCO2 in the hand-held terminal.
Select the ReCO2 function desired, under ReCO2 - FUNCTION 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 COMFORT or ECONOMY in the temperature sequence.
COMFORT involves switching in recirculation after cooling
and postheating respectively.
COMFORT involves switching in recirculation prior to cooling and postheating respectively.
4
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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
CO2 FUNCTION
TEMP FUNCTION
*ReCO2*
COOLING:COMFORT
HEATING: ECONOMY
We reserve the right to alter specifications.
GB.RECO2.130204
5.2 Limitations
*ReCO2*
FUNCTION OFF/ON
SETTINGS
Under SETTINGS, select the setpoint required for the CO2
signal and the flows required, MIN OUTDOOR AIR and
MIN EXHAUST AIR, see also the Installation Instructions for
the ELQZ-2-504 Air Quality Sensor.
*ReCO2*
CO2 SIGNAL
MIN
OUTDOOR AIR 0.100m3/s
MIN EXHAUST AIR0.100m3/s
5.3 Calibration
In order for the air handling unit to operate correctly, the
pressure drop across the heat exchanger must be calibrated in relation to the airflow through the unit. See the
Operation and Maintenance Instructions for the GOLD.
FILTERS
*FILTERS*
READINGS
CALIBRATION
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.
*FILTER CALIBRATION*
STD.FILTER
PREFILTER
HEAT EXCHANGER
*HEAT EXCHANGER*
CALIBRATION H EXCH
CALIBRATION ReCO2
We reserve the right to alter specifications.
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GB.RECO2.130204
Performance checks
F 012
A flashing light-emitting diode L1 indicates correct communication with the GOLD unit’s control unit.
13 14 15 16 17 18 19 20 21 22 23 24
34 5 6
7 89A
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.
BCDE
6.
L1
L2
1 2 3 4 5 6 7 8 9 10 11 12
L1
Pressure sensor:
Light-emitting diode L2 lit with a steady glow indicates
that power is being supplied from the GOLD unit’s control
unit.
L1
L2
L2
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.
7 89
A flashing light-emitting diode L1 indicates correct communication with the GOLD unit’s control unit.
6
We reserve the right to alter specifications.
2 34
56
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