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 9
Using the Keypad/Display
Manual Control
A user may manually control outputs to check operation of components when Manual Control
is set to ManCtrl. When Manual Control is set to ManCtrl, the unit is disabled and the unit is
shut down in the normal manner if it is operating. Outputs listed in the Manual Control menu
of the Keypad/Display section can then be controlled directly until Manual Control is set to
Normal.
Note – Manual Control will be set to No automatically after 240 minutes so that a person could not
put the unit into Manual Mode control and walk away from the unit and let it run at the
manual settings.
When Manual Control is set to Yes, the Control Mode is set to Off so that the unit will not
restart automatically.
When Manual Control is set to Normal all digital outputs in the Manual Control menu are set
to Off and all the analog outputs are set to 0.0% so that all outputs are in the Off or minimum
position when Manual Control is set to ManCtrl.
All alarms except those listed below are overridden during Manual Control.
During manual control, the unit will respond in the normal manner to the following alarms.
• Emergency Stop Fault
• Duct High Limit
• High Return Temperature
• High Discharge Temperature
• Low Discharge Temperature
• High Pressure - Circuit # 1
• High Pressure - Circuit # 2
• Low Pressure - Circuit # 1
• Low Pressure - Circuit # 2