GRECH MOTORS
21
Mode Selector
Push once for A/C, push again for heat and push once more to turn off.
A/C Mode
Display on, reads and displays probe temperature, blower motor operates. Constant signal from A/C relay above set
temperature point and signal off below set temperature point. A/C light will be on.
Heat Mode
Display on, reads and displays probe temperature, blower motor operates. Constant signal from heat relay below set
temperature point and signal off above set temperature point. Heat light will be on.
Blower Speed
Select desired blower speed by pressing the up or down arrows, display will indicate set speed, F1 to F3 for the three speeds
of
operation.
Temperature
Temperature can be set by using the up/down buttons to select the desired level between 50°F and 99°F or 10°C and 37°C.
Display will show set temperature for two or three seconds then display will show actual temperature. To switch between
Fahrenheit and Celsius press both temperature up and down buttons at the same time for three seconds.
Auto Mode
With A/C or heat on press auto to turn on auto 1 or auto 2 temperature control, press once more to shut off. In auto 1 mode
temperature is main or - 2° and blower speed is manually set. In auto 2 mode temperature is main or - 2° and
blower speed is automatic and cannot be changed. To switch between auto 1 and auto 2 press and hold temperature up
button then press and hold auto button for three seconds. Display will show current auto mode (A1 or A2) then switch to the
other mode (A2 or A1) .
Preset Operations
Upon cycling of 12vdc supply, the unit will default to previous settings mode and blower speed. All output signals are negative
voltage.
PROAIR
Control Panel
Temperature & Blower
Speed Display
Temperature Set
Automatic Control
On Off
Automatic On Light
Blower Speed
Mode Selector
A/C & Heat Lights
