OPERATIONAL CHECKS - TM-5-4120-383-140038

TM5-4120-383-14

2-6.

OPERATIONAL

CHECKS.-Continued

Turn the MODE SELECTOR switch to VENT (ventilate). The

evaporator fan should start immediately. Use a paper streamer or

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

out of the conditioned air supply louver.

Check the EVAPORATOR FAN

There

SPEED switch at both the HIGH and the LOW speed settings.

should be noticeably more airflow at the HIGH speed setting.

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

exit through an open door or window.

If the room or

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 close the fresh

air damper.

j. Turn the TEMPERATURE SELECTOR (thermostat) knob to the full

WARMER (clockwise) position.

Then turn the MODE SELECTOR switch to

LOW HEAT.

Place your hand in the airflow from the conditioned air

supply louver and feel for a temperature rise. When the supply air

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 SELECTOR (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.

210