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CaptiveAire DOAS RTU Series - User Manual

CaptiveAire DOAS RTU Series
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Packaged Rooftop Unit - DOAS RTU Series
Installation, Operation, and Maintenance Manual
WARNING! FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in serious injury, death or property damage.
• Make sure to read and understand the installation, operation and service instructions in this manual.
• Improper installation, adjustment, alteration, service or maintenance can cause serious injury, death or
property damage.
• Read the installation, operating and maintenance instructions thoroughly before installing or servicing
this equipment. ALWAYS disconnect power and gas prior to working on unit.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance. Installation and service must be performed by a qualified installer, service agency or gas supplier.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your
building.
• Leave the building immediately. Immediately call your gas supplier from a phone remote from the
building.
• Follow the gas supplier’s instructions. If you cannot reach your gas supplier, call the fire department.
IMPORTANT
Some units may contain an energy recovery wheel. By virtue of their design, all energy recovery wheels
allow a level of return/exhaust air and contaminants to be recirculated into the supply airstream. Accepting
and operating this unit with or without the energy recovery wheel in operation increases the risk of airborne
bacteria, virus and contaminant spread between the return/exhaust air, into the fresh airstream.
In accordance with ANSI/ASHRAE/ASHE Standard 170-2017, energy recovery wheel technology should not
be used as a means of ventilation for certain Health Care Facilities. An ASHRAE Position Document on
Infectious Aerosols, approved by ASHRAE Board of Directors, dated April 14, 2020, also recommends that
energy recovery devices be bypassed for non-health care facility ventilation to help reduce the spread of
virus.
Any reduction of outdoor air % or volume below what this unit was designed for elevates the risk of airborne
bacteria, virus and contaminant recirculation back into the fresh airstream and the space.
Operating this unit with an exhaust level less than 50% of the supply level nullifies all return on investment
statements and limits the amount of energy recovery.
This unit, including the energy recovery wheel, must be serviced and maintained as per the Installation and
Operation Manual’s recommended frequencies.
RECEIVING AND INSPECTION
Upon receiving unit, check for any interior and exterior damage, and if found, report it immediately to the
carrier. Check that all accessory items are accounted for and free of damage. Turn the blower wheel by hand
to verify free rotation and check the damper (if supplied) for free operation.
A0033507
October 2020 Rev 00

Table of Contents

Questions and Answers

  • K
    Kimberly CarterSep 23, 2025
    What does 'Unit On - HMI Off' mean on my CaptiveAire Air Conditioner and how to fix it?
    • S
      Stacey SheppardSep 23, 2025
      If your CaptiveAire Air Conditioner displays 'Unit On - HMI Off', check connector J13 is properly connected. Also, check wiring from HMI to connector J13 and verify the circuit breaker (CB-01) is On.
  • J
    Jamie NelsonAug 25, 2025
    Why is my CaptiveAire DOAS RTU Air Conditioner system operating continuously with poor cooling/heating in heat pump mode?
    • N
      Nancy HernandezAug 25, 2025
      Continuous operation with poor cooling or heating in heat pump mode can be due to several reasons. It could be a shortage of refrigerant, so test for leaks and add refrigerant if needed. Other potential causes include a restricted discharge line (repair or replace as required), dirty or clogged filters (inspect and clean or replace them), or a dirty indoor coil (inspect and clean it). Also, check for low airflow across the indoor coil by checking blower speed, duct static pressure, and filters. Verify the compressor modulates between Min to Max frequency and that the EEV position is 0% when not in heating or cooling under Refridge Diag. Finally, ensure the correct EEV is installed.
  • U
    uterryAug 25, 2025
    What to do if my CaptiveAire DOAS RTU Air Conditioner system operates but blows cold air in heat pump mode?
    • L
      lynchjudyAug 26, 2025
      If your CaptiveAire Air Conditioner system is blowing cold air in heat pump mode, first verify that the compressor modulates between Min to Max frequency. Also, test the reversing valve and defrost control.
  • A
    Andrea VillarrealAug 27, 2025
    How to troubleshoot 'Supply Overload Exhaust Overload' error on CaptiveAire DOAS RTU?
    • K
      Kayla ChanAug 27, 2025
      If you're seeing a 'Supply Overload Exhaust Overload' error, it means the motor overload has tripped. Start by checking the motor for debris. Also, check the contactor/motor wiring connections, the overload reset button, the overload amperage setting and motor bearings.
  • M
    Melanie TranAug 27, 2025
    What to do if my CaptiveAire DOAS RTU Air Conditioner is blowing cold air in electric heat mode?
    • J
      Jordan MartinezAug 27, 2025
      If your CaptiveAire Air Conditioner is blowing cold air in electric heat mode, check the electrical wiring, the electric heater disconnect switch, the fuses in the electric heater panel (replace if needed), and the airflow switch and tubing at the MUA board.
  • L
    lewiseddieSep 13, 2025
    What does 'Supply VFD Comm' mean on my CaptiveAire DOAS RTU and how to fix it?
    • A
      Angela FergusonSep 13, 2025
      If your CaptiveAire Air Conditioner displays 'Supply VFD Comm', check Modbus wiring and connections. Also, verify Modbus address and verify Min and Max settings of the VFD to the MUA board settings by going to Factory Settings > Unit Options > Blower Config > VFD Freq Limits.
  • J
    Jose FrancoSep 12, 2025
    What does 'Oil Sensor' mean on my CaptiveAire DOAS RTU Air Conditioner and how to fix it?
    • M
      Michael MccannSep 12, 2025
      If your CaptiveAire Air Conditioner displays 'Oil Sensor', check the oil level if a sight glass is available. Also, increase compressor velocity for short periods of time, check oil level sensor wiring and check transformer voltages.
  • S
    stephenrossSep 12, 2025
    How do I troubleshoot the 'FSC Vent Proving' error on my CaptiveAire Air Conditioner?
    • C
      Cynthia AdamsSep 12, 2025
      If you're encountering a 'FSC Vent Proving' error, check for a kinked, blocked, or damaged hose. Also, check for a blockage in vent system, check bleed hole in proving switch, check for clogged condensation drain, check power vent motor and check failed vent proving switch.
  • B
    Brian SharpSep 4, 2025
    What does 'Gas PS Low' mean on my CaptiveAire Air Conditioner and how can I resolve it?
    • T
      Terry HarperSep 4, 2025
      If your CaptiveAire Air Conditioner displays 'Gas PS Low', it indicates that the board lost input on the gas pressure low terminal, which should have an input when gas pressure is at the proper level. Check the low gas pressure switch. Also, check the wiring and repair any broken or loose wiring connections and replace the switch.
  • R
    rebecca15Sep 2, 2025
    What does it mean when my CaptiveAire DOAS RTU Air Conditioner displays 'Stat Broken'?
    • J
      Jacqueline LewisSep 2, 2025
      If your CaptiveAire Air Conditioner displays 'Stat Broken', and the temperature sensor signal being sensed is too high, install and wire sensor.

Summary

Fire and Explosion Hazard Warnings

Safety Precautions

Important Considerations for Energy Recovery

Receiving and Inspection Procedures

CaptiveAire DOAS RTU Series Specifications

General IconGeneral
BrandCaptiveAire
ModelDOAS RTU Series
CategoryAir Conditioner
LanguageEnglish