Instruction manual
Table Of Contents
- Introduction
- Using the Keypad/Display
- Keypad/Display Menu Structure
- System Summary Menu
- Standard Menus
- System Menu
- Occupancy Menu
- Temperature Menu
- Flow Summary Menu
- Supply Fan Speed Menu
- Return/Exhaust Fan Speed Menu
- Cooling Menu
- Head Pressure Menu
- Evap Condensing Menu
- Economizer Menu
- Min OA Damper Menu
- Heating Menu
- Energy Recovery
- Dehumidification Menu
- Daily Schedule Menu
- One Event Schedule Menu
- Holiday Schedule Menu
- Optimal Start Menu
- Operating Hours Menu
- Extended Menus
- Unit Setup Menu
- Timer Settings Menu
- Time/Date Menu
- Supply Fan Setup Menu
- Return/Exhaust Fan Setup Menu
- Zone Temperature Setup Menu
- Compressor Setup Menu
- Head Pressure Setup Menu
- Chilled Water Setup Menu
- Economizer Setup Menu
- Design Flow Setup Menu
- Heating Setup Menu
- Dehumidification Setup Menu
- Alarm Out Configuration Setup Menu
- Alarm Limits Setup Menu
- Manual Control Menu
- LON/BACnetIP/BACnetMSTP Setup Menu
- Active Alarm Menu
- Alarm Log Menu
- Advanced Menus
- Unit Configuration Setup Menu
- Save/Restore Menu
- Alarm Delays Setup Menu
- Analog Input Status Menu
- Universal I/O Status Menu
- Digital Input Status Menu
- Digital Output Status Menu
- Adv Setup Settings Menu
- Adv Status Parameters Menu
- Alarms
- Operator’s Guide
- Determining Unit State
- Off Operating State
- Start Up Operating State
- Recirculating Operating State
- Heating
- Economizer
- Mechanical Cooling
- Determining Unit Status
- Determining Control Mode
- Determining Cooling Status
- Determining Heat Status
- Determining Economizer Status
- Determining Cooling Capacity
- Determining Heating Capacity
- Determining Supply Air Fan Capacity
- Determining RF/EF Capacity
- Determining Outside Air Damper Position
- Determining Emergency Mode
- Determining Application Mode
- Determining Occupancy Status
- Determining Occupancy Mode
- Determining Occupancy Source
- Unoccupied Operation
- Scheduling
- Temperature Control Configurations
- Heat/Cool Changeover
- Dehumidification
- Energy Recovery
- Outside Air Damper Control
- Outside Air Damper Control, Two Position
- Special Procedures for Units with WRV and More Than Two Circuits.
- Water Pump Control
- Cooling: Multistage
- Cooling: Modulating
- Heating Control
- Modulating
- Min DAT
- Indoor Air Fan - On/Off Control
McQuay OM 920 5
Introduction
Getting Started
This manual contains information designed to assist the field technician with unit setup. The
technician will need to be familiar with the following topics at a minimum to successfully set
up unit operation.
• Keypad navigation/editing/passwords
• Control Mode
• Occ Mode
• DSP Setpoint
• BSP Setpoint
• Heat/Cool Changeover (Zone Setpoints)
• DAT Clg Setpoint
• DAT Htg Setpoint
• Clg Enable (OAT/EWT lockout)
• Htg Enable (OAT lockout)
• Econo Enable (Changeover temp/Enthalpy switch)
• Ventilation Limit/OA damper
WARNING
Excessive moisture in the control panel can cause hazardous working
conditions and improper equipment operation.
When servicing this equipment during rainy weather, the electrical
components in the main control panel must be protected from the rain.
CAUTION
Extreme temperature hazard. Can cause damage to system components.
The MicroTech III controller is designed to operate in ambient temperatures
from -20°F to 125°F. It can be stored in ambient temperatures from -40°F to
140°F. It is designed to be stored and operated in relative humidity up to 95%
(non-condensing).
CAUTION
Static sensitive components. A static discharge while handling
electronic circuit boards can cause damage to the components.
Discharge any static electrical charge by touching the bare metal inside the
main control panel before performing any service work. Never unplug any
cables, circuit board terminal blocks, relay modules, or power plugs while
power is applied to the panel.