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NOTE:
CLOSING THE INTAKE GRILLE DAMPER CAUSES A
GREATER PORTION OF THE TOTAL AIR FLOW TO
BE DRAWN FROM THE OUTS IDE THROUGH DAMPER
DOOR
A. COOLING OPERATION:
STEP 1.
POSITION THERMOSTAT FOR DESIRED TEMPERATURE.
STEP 2. PLACE ROTARY SWITCH ON COOL POSITION.
STEP 3. FOR COOLING WITH 100 PERCENT RECIRCULATED Al R, CLOSE FRESH AIR DAMPER DOOR
AND OPEN INTAKE GRILLE DAMPER.
STEP 4. FOR COOLING WITH FRESH MAKEUP AIR OPEN FRESH AIR DAMPER DOOR AND PARTIALLY CLOSE
INTAKE GRILLE DAMPER.
STEP 5. FOR COOLING WITH FRESH MAKEUP AIR DRAWN THROUGH CHEMICAL, BIOLOGICAL, FILTER
UNIT WHEN OUTDOOR AIR IS CONTAMINATED. CLOSE FRESH AIR DAMPER DOOR AND OPEN
INTAKE GRILLE DAMPER.
B. HEATING OPERATION
STEP 1. POSITION THERMOSTAT FOR DESIRED TEMPERATURE
STEP 2. PLACE ROTARY SWITCH ON LO HEAT OR HI HEAT POSITION
STEP 3. FOR HEATING WITH 100 PERCENT RECIRCULATED AIR, CLOSE FRESH AIR DAMPER DOOR AND
OPEN INTAKE CIRCLE DAMPER.
STEP 4. FOR HEATING WITH FRESH MAKEUP AIR. OPEN FRESH AIR DAMPER DOOR AND PERTIALLY CLOSE
INTAKE GRILLE DAMPER.
STEP 5. FOR HEATING WITH FRESH MAKEUP AIR DRAWN THROUGHT CHEMICAL, BIOLOGICAL, FILTER
UNIT WHEN OUTDOOR AIR IS CONTAMINATED. CLOSE FRESH AIR DAMPER DOOR AND OPEN
INTAKE GRILLE DAMPER
C. VENTILATING OPERATION:
STEP 1. PLACE ROTARY SWITCH IN VENTILATE POSITION.
STEP 2. FOR VENTILATING OPERATION. OPEN FRESH AIR DAMPER DOOR AND CLOSE INTAKE GRILLE
DAMPER
ME 4120-308-15/2-8
Figure 2-8. Operating instructions
2-12
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