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Section IV. OPERATION UNDER USUAL CONDITIONS
2-7. General
Instructions in this section are published for in-
formation and guidance of personnel responsible
for operation of the air conditioner. It is essential
that the operator knows how to perform every
operation of which the air conditioner is capable.
This section gives instructions on starting and
stopping the air conditioner, and detailed operating
instructions. Since nearly every condition presents a
different problem the operator may have to vary the
given procedure to fit the condition.
2-8. Starting and Operating Instructions
a. Preparation for Starting.
(1) Check to see that instructions given in
paragraph 2-2 have been carried out.
(2) Adjust Switch # 1 for desired outside and
return air mixture.
(3) Put Switch # 3 on “VENT”.
(4) Put Swtich # 2 “ON”. (evaporator fan
start)
b. Operating Instructions for Cooling.
(1) For cooling, put Switch # 3 on “COOL”.
(2) Adjust Switch
# 4 for
desired
tem.
perature. (condenser fan and compressor start)
c. Operating Instructions for Heating.
(1) For heating, put Switch #‘3 on “HEAT”.
(2) Adjust Switch
# 4 for desired tem-
perature. (heater coil activates).
d. Operating Instructions for Ventilation.
(1) Refer to paragraph 2-8a. and follow
starting instructions.
2-9. Stopping Instructions
To shut down the system it is necessary only to turn
the on-off switch # 2 to “OFF”.
Section V. OPERATION UNDER UNUSUAL CONDITIONS
2-10. Operation in Extreme Cold (Below 0°F
( – 1 8 ° C ) )
The air conditioner should not be used below 0°F.
However, the system may be operated on the
heating cycle in an ambient temperature as low as
—65° F. The evaporator fan motor and condenser
fan motor should not be operated below —65° F.
2-11. Operation in Extreme Heat
When the unit is required to operate with the
condenser in an ambient temperature higher than
125° F, it will, as the temperature increases, suffer a
reduction in cooling capacity and a related in-
crease in power requirements until this increased
power flow trips the overload devices protecting the
compressor.
When the outside air temperature is
60° or lower, opening the fresh air louver would
make operation of the cooling system unnecessary.
2-12. Operation in Dusty or Sandy Areas
In areas where the air is ‘laden with dust, dirt,
smoke, soot and other debris, it is essential that the
coils, filter, and fans be cleaned periodically so that
they can perform efficiently. Since the condenser
coil uses outside air, it requires cleaning more
frequently than the evaporator coil which is
protected from dirt by the filter. Both coils may be
cleaned by brush, vacuum cleaner or high velocity
air, but care should be taken not to damage the fins.
T h e f a n b l a d e s s h o u l d a l so
be inspected
periodically and cleaned when the need arises to
prevent imbalance and vibration, refer to chapter 3,
section 3-17 a. The air
conditioner air filter
provided in this unit is cleanable and reusable. It
2-4
may be inspected by removing the front evaporator
panel, and sliding the filter from the retainer guide.
If dirty, service the filter, refer to paragraph 3-156.
2 - 1 3 . O p e r a t i o n U n d e r R a i n y o r H i m id
Conditions
In areas of high humidity the following precautions
should be followed to provide maximum protection
to the unit and to assure efficient operation.
a. Keep all inlet and outlet air vent doors
shielded from the rain.
b. Keep all electrical components clean and dry.
c. Inspect the condenser and evaporator coils
daily for dirt and corrosion. Clean as necessary.
d. Inspect drain tube daily to be sure that it is
not restricted. Clean as necessary.
e. Paint all surfaces where the paint is chipped,
peeled or worn.
2-14. Operation in Salt Water Areas
For precautions to be followed while operating in
salt water areas refer to paragraph 2-13.
2-15. operation in Snow
For precautions to be followed while operating in
snow refer to paragraphs 2-10, 2-12 and 2-13.
2-16. operation in Mud
For precautions to be followed while operating in
mud refer to paragraphs 2-12 and 2-13.
2-17. operation at High Altitudes
T h e r e a r e no
special
instructions
regarding
operation and servicing at high altitudes except that
special care be taken to keep air filters clean. In-
spect filters daily.
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