Turn cooling temperature

Turn cooling temperature setting as high as it will go.
3. Inspect all registers and set them to the normal open
position.
4. Turn on the unit's electrical supply at the fused disconnect
switch, both for the indoor unit and the outdoor unit.
5. Turn the fan switch to the "ON" position. The blower
should operate 10 to 15 seconds later.
6. Turn the fan switch to the "AUTO" position. The blower
should stop 90 seconds later.
NOTE: If outdoor temperature is below 55°F, proceed to
step 9. Do not check out in the cooling mode.
7. Slowly lower the cooling temperature until the first mercury
bulb makes contact. The compressor, indoor blower, and
outdoor fan should now be running. Make sure cool air is
supplied by the unit.
8. Turn system switch to "HEAT" and fan switch to "AUTO".
9. Slowly raise the heating temperature setting. After the
heating first-stage mercury bulb (upper) makes contact,
stop moving the lever. The compressor, indoor blower
and outdoor fan should now be running. After giving the
unit time to settle out, make sure heated air is being
supplied by the indoor unit.
10. If the outdoor ambient is above 70°F, the compressor
may trip on internal overload.
11. In the event that the outdoor ambient is too high to allow
a thorough heating cycle check, postpone the test until
another day when conditions are more suitable...but —
DO NOT FAIL TO TEST.