OPERATIONAL CHECKS.

TM5-4120-384-14

2 - 6 . OPERATIONAL CHECKS.-Continued

The

Turn the MODE SELECTOR switch to VENT (ventilate).

Use a paper streamer or

evaporator fan should start immediately.

other method to check the airflow into the return air louver and

out of the conditioned air supply louver.

To check maximum ventilation with fresh air, first turn the

fresh air damper control wheel to fully open (down) then adjust the

louvers in both sections of the return air louver fully closed.

Check the fresh air inlet located on the lower left corner of the

back of the unit using a paper streamer or other method to be sure

that air is being drawn in.

NOTE

For maximum ventilation with fresh air, it is

necessary that room or enclosure air have a means of

If the room or

exit through an open door or window.

enclosure is tightly closed, an overpressure will

build up and decrease the volume of fresh air drawn

in.

Fully

open

the

return

air

louvers

and

fully

the

fresh

air damper.

Turn the TEMPERATURE SELECTOR (thermostat) knob to the full

Then turn the MODE SELECTOR switch to

WARMER (clockwise) position.

Place your hand in the airflow from the conditioned air

LOW HEAT.

When the supply air

supply louver and feel for a temperature rise.

temperature has reached a relatively stable level, turn the MODE

SELECTOR switch to HIGH HEAT and feel for a further temperature

Next, turn the TEMPERATURE SELECTOR thermostat control knob

rise.

Feel that supply

to the fully COOLER (counterclockwise) position.

air temperature drops to approximately the same relatively stable

Finally, turn the MODE

level previously noted in LOW HEAT.

SELECTOR switch to LOW HEAT and feel the discharge air temperature

drop to ambient level (room temperature).

NOTE

The temperature thermostat control has an effective

functional range between 60F and 90F (16C and

32C).

In extreme conditions when ambient air

temperature is below 60F (16C) or above 90F

(32C), the operation in either LOW HEAT or HIGH HEAT

mode will vary from that described above.

2-10