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Zehnder Rittling ComfoAir 70 Operating And Installation Instructions

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ComfoAir 70
Operating and installation instructions for users and installation technicians

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Summary of Contents for Zehnder Rittling ComfoAir 70

  • Page 1 ComfoAir 70 Operating and installation instructions for users and installation technicians...
  • Page 3 Legal regulations All rights reserved. This manual has been compiled with the utmost care. Nevertheless, the publisher accepts no liability for damage caused by missing or incorrect details in this manual. We reserve the right at any time and without previous notification to change the content of these instructions in part of as a whole.

  • Page 4: Table Of Contents

    Qualification of target group 1.2.1.1 Users 1.2.1.2 Skilled technicians / installers 1.2.2 Standard operation of the unit Introduction and safety Proper use 2.1.1.1 ComfoAir 70 ventilation unit 2.1.1.2 Control panels Safety 2.2.1 Safety regulation 2.2.2 Installation conditions 2.2.3 Symbols used Warranty and liability 2.3.1...
  • Page 5 Installation 4.2.1 General installation instructions 4.2.2 Installation preparations 4.2.3 Connecting the air ducts (for second room connection) 4.2.4 Installing the ventilation unit 4.2.5 Electrical connections 4.2.5.1 Connection for power supply 4.2.5.2 Connecting the internal control panel 4.2.5.3 Installing and connecting the sensor system module 4.2.6 Configurable operating modes 4.2.6.1...

  • Page 6: Preface

    „ Unit type ComfoAir 70 series The subject of this manual is the ComfoAir 70 in its various designs variants. Possible accessories are only described to the extent necessary for appropriate operation in the unit. Please refer to the respective instructions for further information on accessory parts.

  • Page 7: Introduction And Safety

    2.1.1.1 ComfoAir 70 ventilation unit The ComfoAir 70 can be used for controlled ventilation in living and office areas (with limitations in the commercial sector) at a normal room air humidity of approximately 40-70% relative humidity; briefly up to approximately 80% relative humidity. Conditions outside of this range are considered as misuse.

  • Page 8: Symbols Used

    Every other use is deemed as “improper use”, and can lead to damage of the ComfoAir 70, or to personal injury, for which the manufacturer cannot be held liable. The manufacturer shall not be liable for any kind of damage that can be attributed to the following causes: „...

  • Page 9: Instructions For The User And Skilled Technician / Installer

    An enthalpy exchanger, which can transfer both humidity and heat, is used in the ComfoAir 70 for energy recovery. The housing consists of a powder-coated steel plate, as well as covers made of aluminum in the RAL9016 color scheme. The unit body, made from a high-quality expanded polypropylene (EPP), is used for accommodating the unit components, and also makes sure there is the necessary insulation and unit soundproofing.

  • Page 10: Type Label

    The control panels have touch-sensitive buttons, which means the respective operating functions are triggered by touching the relevant buttons. The ComfoAir 70 can be operated with the internal and/or the external control panel. The button assignments and the LED signaling in both control panels are identical in terms of functions.

  • Page 11: Operating Functions And Signaling From The Control Panel

    Operating functions and signaling from the control panel Icon Description Explanation Fan speed The selection for the current fan speed (4 fan speeds with preset speeds for each fan) operating mode is made by using the (-) / (+) buttons. Fan speed 1 (LS1) Touching the (+) button increases the fan speed to the next setting and touching the (-) button decreases the fan speed to the next setting.
  • Page 12 INSTRUCTIONS FOR USER & SKILLED TECHNICIAN Icon Description Explanation Automatic The Automatic function can only be activated with a sensor system operating mode module. (AUTO) Touching the (+) button from the currently active LS4 transfers the unit to AUTO fan speed. AUTO fan speed is exited by touching the (-) button, and the unit is transferred back to LS4.
  • Page 13 Icon Description Explanation Exhaust air Touching the (-) button for 5 seconds while in operating modes LS1 to LS4 activates operating mode or deactivates the Exhaust air operating mode. The supply air fan is switched off; the exhaust air fan continues to run with the current LS. The display for the current LS changes every 2 seconds with the flashing LED1.

  • Page 14: Automatic Operating Mode

    Consequently, an optimized ventilation response and prevention of mold formation is achieved, which ultimately also leads to an increase in energy savings. The ComfoAir 70 ventilation unit with an automatic sensor system module is classified in energy efficiency class A.

  • Page 15: Functional Principle Of Co 2 / Voc Sensor System Module

    3.3.1.2 Functional principle of CO and VOC sensor system modules The CO sensor system module and the VOC sensor system module are each combined with a humidity/ temperature sensor. Only one sensor module may be installed in the unit. The CO sensor system module and the VOC sensor system module both offer you the option to evaluate relative air humidity as well as the air quality for controlling the ventilation unit.

  • Page 16: Replacing The Unit Filter

    Standby operating mode. The ComfoAir 70 has two high-quality, MERV 8 (class G4) filters that are installed by default. Retrofitting a pollen filter, MERV 13 (class F7), is possible. This is inserted into the lower filter compartment (outdoor air filter). The filters can be obtained via Zehnder North America or distributor.

  • Page 17: Resetting The Filter Runtime

    Disposal Discuss what you should do with your ComfoAir 70 at the end of its life cycle, with your supplier. If you cannot return your ComfoAir 70, do not dispose of it in the normal household waste, but rather contact your local authority for options to recycle components or...

  • Page 18: Instructions For Skilled Installers

    General installation instructions The ComfoAir 70 is designed for installation in a conditioned space and on a outer wall. The wall must be plumb and the unit must be installed vertically with the display on the bottom. To mount the ventilation unit, a wall mounting pipe (available separately) must be installed in the outer wall in advance;...

  • Page 19: Connecting The Air Ducts (For Second Room Connection)

    Observe the respective enclosed instructions on professional installation when installing the wall mounting pipe (available separately). Use the mounting template in order to transfer all centerings for the holes onto the inner wall surface. A 110 or 220 VAC main power supply connection is required to operate the unit. The main power supply line and, where applicable, the cable to the external control device, must be installed flush-mounted up to the area of the bottom left side of the unit.
  • Page 20 INSTRUCTIONS FOR SKILLED INSTALLERS 3. Attach the ComfoFlex ducting to the rear duct wall adapter and seal with UL 181a rated duct tape. 4. To ensure proper alignment of the rear duct wall adapter to the CA 70 unit, the adapter(s) must be located per the template on page 40.
  • Page 21 8. With your other hand, engage and thread the outer ring into the adapter until it is seated flush with the surface of the drywall. 9. Using the self-adhesive foam sealing tape provided with the adapter, form a gasket with the tape on the surface of the outer ring.
  • Page 22 INSTRUCTIONS FOR SKILLED INSTALLERS 6. Reaching through the side duct opening that is to be converted to a rear duct connection, carefully push the EPP rear duct plug out of the EPP body as shown below. 7. Using the duct plug just removed from the rear of the EPP body, carefully press into the side opening so that it is sealed. Note: the supply and exhaust openings can be either side or rear facing, not both.

  • Page 23: Installing The Ventilation Unit

    Prior to starting work, ensure that the main power supply is disconnected! Match the required load capacity of the respective mounting surface (dead weight of the ComfoAir 70 is 59 lbs (22 kg)) and the mounting options using wall anchors and screws of sufficient length. The supplied mounting material should only be considered as a suggestion.
  • Page 24 INSTRUCTIONS FOR SKILLED INSTALLERS 6. Screw the wall bracket to the inner wall, and take care to ensure that the main power supply line and, if present, the cable for the external control device, are guided through the area of the cable entry point. If the inner wall surfaces are uneven, or it is not vertical, then the wall bracket must be aligned using suitable spacers or something similar.
  • Page 25 13. Push the unit into the wall mounting pipe as far as it will go, taking into account the electrical connections. Take care to ensure that the lower side of the EPP housing rests on the wall bracket. If necessary, push the upper frame of the wall bracket slightly upwards.

  • Page 26: Electrical Connections

    INSTRUCTIONS FOR SKILLED INSTALLERS 4.2.5 Electrical connections Electrical connections are to be completed in accordance with the existing standards specific to the relevant country, and must only be performed by qualified personnel! 4.2.5.1 Connection for power supply Prior to starting work, ensure that the main power supply is disconnected! A disconnect with a contact opening width in accordance with the conditions from over-voltage category III for complete disconnection in the fixed electrical installation, has to be installed in accordance with the installation regulations.
  • Page 27 4. Push the connections into the connection box and install the cover. 5. Connect the wires of the low-voltage, secondary-side cable of the power supply to the 24 V X6 terminal on the main control board. The low-voltage, secondary side of the power supply is polarity-dependant Color coded power supply low-voltage cable Termination point for 24 V X6 terminal Positive (+)

  • Page 28: Connecting The Internal Control Panel

    INSTRUCTIONS FOR SKILLED INSTALLERS 4.2.5.2 Connecting the internal control panel The internal control panel must be connected to the control board using the ribbon cable. 1. First, plug the connector of one end of the cable (in the position shown) into the designated X9 socket on the control board. 2.
  • Page 29 2. Press the sensor system module into the recess of the EPP housing, bearing in mind the cable routing. 3. Put the upper EPP housing section on the lower EPP housing. Install the sensor cable at the rear and side in the designated cable recess on the EPP housing sections to that the cable ends in the vicinity of the control board.

  • Page 30: Configurable Operating Modes

    INSTRUCTIONS FOR SKILLED INSTALLERS 4.2.6 Configurable operating modes 4.2.6.1 Configuration of Automatic operating mode The DIP switch MODE SW1 can be used to configure the Automatic operating mode for various functionality. The use of the bathroom function requires the installation of the HUMIDITY sensor system module (DIP switch no. 2 of MODE SW1 in ON position).
  • Page 31 2. Place the back cover into the contour of the EPP housing unit on the outer wall side. The side air passage louvers on the back cover are directed downwards. 3. Transfer the center points of the slotted holes onto the outside wall surface. The partition between the outdoor air and exhaust air guide should be in a horizontal position and also match up with the partition of the EPP pipe housing! 4.

  • Page 32: Maintenance And Repair By The Skilled Technician

    Prior to performing repairs or maintenance on the unit, make sure that the main power supply is disconnected! Routine maintenance of the Zehnder ComfoAir 70 is easy to carry out and should be performed regularly to keep the unit operating hygienically and flawlessly. If the air filters are replaced with a factory-recommended model at least every six months, the maintenance interval is two years for other items.
  • Page 33 4. Remove the filter cover and the filter from the upper filter compartment. 5. Remove the upper part of the EPP housing, pulling in an upward direction. The enthalpy exchanger can now be pulled out of the lower part of the EPP housing. 6.

  • Page 34: Replacing The Fans

    INSTRUCTIONS FOR SKILLED INSTALLERS 4.3.2 Replacing the fans To change the fans, the unit must be completely pulled out of the wall. In doing so, proceed as follows: 1. Disconnect the CA 70 from the power supply voltage. 2. Perform steps 2. and 3. as described in 3.3.1. 3.

  • Page 35: Visualization Of Fault Notifications

    Visualization of fault notifications The unit control system is equipped with an internal system for recognizing faults. A fault notification is visualized through the flashing of the red “Fault LED” and a coded failure prediction using LED1-4. As a reaction to a fault status, the fans are shut down and the supply and exhaust valves are automatically closed.

  • Page 36: Pressure Loss-Volume Flow-Characteristic Curves For Design Of Adjoining Room Connection

    INSTRUCTIONS FOR SKILLED INSTALLERS Sound data housing emission Sound pressure level L in [db(A)], free-field conditions with 10 ft. (3 m.) clearance 1 adjoining room 2 adjoining room Fan speed Standard On the outside connection connections 11.0 22.3 23.6 16.3 16.0 35.0 29.4...

  • Page 37: Dimensions

    4.5.2 Dimensions 15” (380mm) Exhaust air Outdoor air Top view 5-11/16” 17-5/16” (145mm) (440mm) Extract air Supply air Side view Front view 10-13/16” - 23-5/8" 7-7/16” (275mm - 600mm) (189mm) 2-3/8” (60mm) 3-15/16” (100mm) 10-13/16” Back view (275mm)

  • Page 38: Mounting Template (Figure Not True To Scale)

    INSTRUCTIONS FOR SKILLED INSTALLERS 4.5.3 Mounting template (figure not true to scale) 17.28” (439) Bore hole for Bore hole for wall bracket wall bracket 5.39” 5.39” (137) (137) CA70 contour Outer contour for angular structural shell set 1.57” (40) Cable feed-through 0.59”...

  • Page 39: Wiring Schematic

    4.5.4 Wiring Schematic Terminal diagram CA 70 Premium 1 Stand 11.05.17 DIP-switch SW1 Version Premium 1 Switch No. Function Factory setting Intake air T1 / isolating flap 1 / fan 1 VOC / CO2 sensor active Supply air Humidity sensor active Exhaust air Fan 2 / isolating flap 2 Boost ventilation function...

  • Page 40: Appendices

    APPENDICES 5 Appendices Checklist A Maintenance work for users Maintenance work Enter date in Quarter 1. Change both filters in the ventilation unit (filter change cycle at least every 6 months) Quarter Year 20... 20... 20... 20... 20... 20... 20... 20...

  • Page 41: Checklist B Maintenance Work For Skilled Technicians

    Checklist B Maintenance work for skilled technicians Maintenance work Enter result „ The listed maintenance work must be carried out in accordance with the components actually available. „ Comments on status using informal protocol No. Components Annually Result 20____ 20____ 20____ 20____ 20____...

  • Page 42: Commissioning And Handover Protocol

    APPENDICES Commissioning and turnover protocol Customer data Last Name: First Name: Tel.: Street: City / State: Zip code: Construction project: Unit type: Serial no.: Year of construction: Completeness No. Components Description Result „ Installed as planned Yes / No / N/A Supply air duct (if accessible) „...

  • Page 43: Air Volume Protocol

    Air volume protocol Customer data Last Name: First Name: Tel.: Street: City / State: Zip code: Construction project: Unit type: Serial no.: Year of construction: Measurement data Meausuring instrument used: Faults during operation: Indoor temperature: Outdoor temperature: Outdoor Exhaust Building moisture status: Fan speed ration Filter status when measuring Exhaust air / supply air:...

  • Page 44: Product Data Sheet

    APPENDICES Product data sheet Model Identification ComfoAir 70 ComfoAir 70 sensor technology Unit configuration Unit only Unit only Type of ventilator Bi-directional Bi-directional Type of drive motor ECM, multi-speed ECM, variable speed Type of heat recovery system Recuperation Recuperation Thermal efficiency of heat recovery [%]...
  • Page 45 ComfoAir 70 sensor ComfoAir 70 sensor Model Identification ComfoAir 70 ComfoAir 70 technology technology 1 Remote room 1 Remote room 2 Remote room 2 Remote room Unit configuration connection connection connections connections Type of ventilator Bi-directional Bi-directional Bi-directional Bi-directional Type of drive motor...

  • Page 46: Product Label

    Product label Produced for the ComfoAir 70 are product labels of various energy efficiency labels in accordance with the energy related products directive 2009/125/EC, depending on the application of the unit. The product label applicable for the ventilation system is based on the installation of the system and the model identifier from the product data sheet.
  • Page 47 1 Room installation 2 Room installation 30 cfm 30 cfm...

  • Page 48: Conformity

    European Union, and that the manufacturer bears sole responsibility. Product name: Decentralized waste heat recovery unit ComfoAir 70 - Series Directive 2014/35/EU of the European Parliament and Council from February 26, 2014, for the harmonization of legal provisions of...

  • Page 49: Eac Certification Of The Eurasian Economic Union

    EAC certificate of the Eurasian Economic Union listed below. Product name: Decentralized waste heat recovery unit ComfoAir 70 - Series Signed for an in the name of:...
  • Page 50 Zehnder North America · 6 Merrill Industrial Dr., Suite 7 · Hampton, NH 03842 · USA T 603-601-8544 · info@zehnderamerica.com · www.zehnderamerica.com...

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