FloAire Modular Packaged Unit - Manual (Page 15)

15
Sequence of Operation-Reheat
The unit can be equipped with an optional reheat coil downstream from the DX coil. When this option is
installed, warm, liquid refrigerant will flow through a reheat coil before it enters the DX coil. This warms
the cooled air discharged from the DX coil and helps to lower the relative humidity of the airstream.
Reheat is always activated in this system, and only uses refrigerant from stage 1.
Sequence of Operation-Liquid Bypass
This system can be installed with a Liquid Bypass option. This option helps prevent coil freezing by
injecting warm liquid refrigerant directly into the DX coil, bypassing the TXV. The system is controlled by
a Bypass Thermostat whose sensing bulb is strapped to the vertical portion of the stage 1 suction line.
When the Bypass Thermostat reads a temperature below 35º F, it sends a signal to a 24V solenoid valve.
The valve opens and allow warm liquid refrigerant to bypass the TXV and go directly into the DX coil.
Once the thermostat reads a temperature above 35º F in the suction line, it shuts off the solenoid valve
and the system continues to operate normally.
Sequence of Operation-Cooling Only or Heat Pump
Onboard HMI
•
MENU – Used to revert back one screen each
time it is pressed. If any value has been altered
and the menu button is pressed, that value will
save.
•
UP – Used to navigate up through the current
list of items.
•
DOWN – Used to navigate down through the
current list of items
•
ENTER – Used to advance once screen each
time it is pressed. If any value has been altered
and the enter button is pressed, that value will
save.
(If any value has been changed, the board will automatically reboot when the user exits to the
home screen)
Info
•
Temperature – Contains values for Discharge, Return, Outside Intake, Space, Mixed Air,
Outdoor-Discharge
∆ T, and Return-Discharge ∆ T. Will show disconnected if there is no sensor
present.
•
Date/Time – Displays time and date based on real time clock (RTC).
•
Outputs – Output voltage to RTU out 0-10V #1.
•
Timers – Displays uptime of the board.
•
Mixed Air Info – Displays live outdoor air % and return air %.
Configuration
•
Modbus Address – This address which will be used to communicate with the board.
•
# Of Stages – Configurable to 1, 2, or 3 stages.
•
Control Mode – Auto (heat/cool), heat, cool, off.
•
Staged Based On – Outside, space.
•
Activate Based On – Outside, space, both, either.