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
