Greenheck DOAS v8.1 Reference Manual

®
Reference Guide for Microprocessor Controller
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
DOAS v8.1
Version date 1/23
Program Features
The microprocessor controller offers control through
easy monitoring and adjustment of unit parameters by
way of a lighted graphical display and an integral push-
button keypad.
Pre-Programmed Operating Sequences
The controller has been pre-programmed to offer
multiple control sequences to provide tempered air.
Factory default settings allow for easy setup and
commissioning. The sequence parameters are fully
adjustable. Refer to the Sequence of Operation for
details.
BMS Communication
The user can remotely adjust setpoints, view unit status
points and alarms. The microprocessor controller is
capable of communicating over several protocols:
• BACnet® MSTP
• BACnet® IP
Reference Points List for a complete list of BMS points.
Built-In Occupancy Schedule
The controller has an internal programmable time clock,
allowing the user to set occupancy schedules for each
day of the week. The controller option also has morning
warm-up and cool down capability for improved
comfort at the time of occupancy.
Alarm Management
The microprocessor controller will monitor the unit's
status for alarm conditions. Upon detecting an alarm,
the controller will record the alarm description, time,
date, and input/output status points for user review.
Alarms are also communicated via BMS (if equipped).
Introduction
• Modbus RTU
• Modbus TCP
Microprocessor Controller for
Dedicated Outdoor Air System
Technical Support
Call 1-866-478-2574
Occupancy Modes
The microprocessor controller offers three modes of
determining occupancy: a digital input, occupancy
schedule or the BMS. If in the unoccupied mode, the
unit will either be shut down, continue normal operation
utilizing adjustable unoccupied setpoints, recirculate
with unoccupied setpoints or will cycle on to maintain
adjustable unoccupied space temperature and humidity
setpoints (space temperature and humidity sensor is
optional).
Remote Unit Access (if equipped)
The WebUI and Remote Display are two ways to gain
access to the unit controller allowing monitoring of the
unit and parameter adjustment without being at the
unit.
The WebUI can be accessed via a building network
and is included with every unit controller. The Remote
Display is an LCD to be panel mounted in a remote
location and is an option available for purchase.
WARNING
Electrical shock hazard. Can cause personal injury or
equipment damage. Service must be performed only
by personnel that are knowledgeable in the operation
of the equipment being controlled.
WARNING
Mechanical high static protection cutoffs must
be installed by others to protect the system and
equipment from over-pressurization when using
factory provided control sensors. The manufacturer
does not assume responsibility for this.
Microprocessor Controller for DOAS
Document 485936
1