GB.RECO2.101010 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. Requirements: Air handling unit, 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 35-80 GOLD CX units. The function can, together with the air recirculation damper, be set for controlling the CO2 content and/or the temperature. GOLD RX 12-120 GOLD CX 35-80 or 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 (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 TBBR/TCBR Damper actuator GMA 161.IE We reserve the right to alter specifications. www.swegon.com 1 GB.RECO2.101010 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 www.swegon.com We reserve the right to alter specifications. GB.RECO2.101010 4. Electrical connections Recirculation damper/ Internal damper. IQnomic Plus module 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 BCDE L1 The function selector switch must be set to the 0 position L2 1 2 3 4 5 6 7 8 9 10 11 12 * 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). 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. 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. www.swegon.com 3 GB.RECO2.101010 5. Adjustment INSTALLATION 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 www.swegon.com 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.RECO2.101010 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 AIR 0.100m3/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. www.swegon.com 5 GB.RECO2.101010 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 www.swegon.com 56 6 01 2 34 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. We reserve the right to alter specifications.
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