SET THERMOSTAT FOR DESIRED ROOM TEMPERATURE.
STEP 2. TURN ROTAR CONTROL SWITCH TO C O O L .
STEP 3. TURN DAMPER CONTROL KNOBS TO DESIRED POSITION FROM M I N (100% RETURN-AIR)
TO M AX (100% FRESH-AIR).
DAMPER CONTROLS AT FULL MIN
STEP 1. TURN ROTARY CONTROL SWITCH TO F AN POSITION FOR VENTILATION ONLY.
STEP 2. ADJUST DAMPER TO ADMIT FRESH AIR AS DESIRED.
Figure 8. Starting And Operating Instructions.
the unit, including controls, control box,
23. Operation in High Altitudes
panels, fans, motors, and filters should be
The unit is designed to operate in altitudes
thoroughly wiped dry to prevent corrosive
up to 5000 ft. At high altitudes, the output of
the fans will be reduced. This is a normal con-
effects. Remove rust immediately and coat ex-
dition which can not be prevented. Keep inlet
posed metal surfaces
with an approved protec-
screens, filters and fans-free of dirt and ob-
structions at all times.