Figure 2-5. Operating instructions.

A. COOLING OPERATION:

STEP 1. POSITION TEMPERATURE CONTROL FOR DESIRED TEMPERATURE.

STEP 2. PLACE SELECTOR SWITCH ON COOL POSITION.

STEP 3. FOR COOLING WITH 100 PERCENT RECIRCULATED AIR, CLOSE DAMPER DOOR AND OPEN INTAKE

GRILLE DAMPER.

STEP 4. FOR COOLING WITH FRESH MAKEUP AIR, OPEN 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 DAMPER DOOR AND PARTIALLY CLOSE

INTAKE GRILLE DAMPER.

B . HEATING OPE RATION:

STEP 1. POSITION TEMPERATURE CONTROL FOR DESIRED TEMPERATURE.

STEP 2. PLACE SELECTOR SWITCH ON LO HEAT OR HI HEAT POSITION.

STEP 3. FOR HEATING WITH 100 PERCENT RECIRCULATED AIR, CLOSE DAMPER DOOR AND OPEN INTAKE

GRILLE DAMPER.

STEP 4. FOR HEATING WITH FRESH MAKEUP AIR, OPEN DAMPER DOOR AND PARTIALLY CLOSE INTAKE

GRILLE DAMPER.

STEP 5. FOR HEATING WITH FRESH MAKEUP AIR DRAWN THROUGH CHEMlCAL, BIOLOGICAL, FILTER

UNIT WHEN OUTDOOR AIR IS CONTAMINATED, CLOSE DAMPER DOOR AND PARTIALLY CLOSE

INTAKE GRILLE DAMPER.

C. VENTILATING OPERATION:

S T E P 1. PLACE SELECTOR SWITCH IN VENTILATE POSITION.

STEP 2. FOR VENTILATING OPERATION, OPEN DAMPER DOOR AND CLOSE INTAKE

GRILLE

DAMPER.

MEC 4120 -222-15/2-5

Figure 2-5. Operating instructions.

Section V. OPERATION UNDER UNUSUAL CONDITIONS

Caution: Do not disturb the wiring during

2-12. Operation in Extreme Cold

cold weather unless absolutely necessary. Cold

a. General. The air conditioner is designed to

temperatures make wiring and insulation brittle

o p e r a t e at a maximum low temperature of

and easily broken.

-65F, (Fahrenheit). Be sure that all thermo-

static controls and dampers are in working order.

b. Electrical System. Make sure the electrical

system is free of ice and moisture.

AGO 20053A