21
®
Model MSX Make-Up Air
NOTE
The Freeze Temperature is preset to the factory
recommended 45°F. Steps 9-11 should only be
completed if the Freeze Temperature needs adjustment.
NOTE
The Freeze Temperature is the temperature at which the
supply solenoid closes and the drain solenoid opens
to drain the supply line, preventing possible freeze
damage. A drain solenoid is required for this option.
9. Enter Program Mode
Press and hold
the Enter Key
for three seconds. The
display will read “Pro”
when Program Mode is
active.
10. Adjust the Freeze Temperature
While in Program Mode, use the Up and Down
Keys to navigate
through the Menu
Options until
“Frt” is displayed.
Press the Enter
Key to access the
selected Menu Option
setting.
Use the Up and Down Keys to adjust the Freeze
Temperature setting as needed. Press the Enter Key to
set the Freeze Temperature and return to the Program
Menu.
11. Exit Program Mode
After 15 seconds of idle time the controller will exit
Program Mode.
Program Display
Freeze Temperature
Display
NOTE
The enter key must be pressed to save the new
freeze temperature.
