9
MAINTENANCE
A. Air Filter
1. Periodically (a minimum of every 2 weeks of opera-
tion) slide out the return air filters located on the
end of the air distribution box. Wash the filters with
soap and warm water, let dry and then reinstall.
Note:
To insure easy future removal the filters need to be
replaced with the domed side of their handle positioned
towards the ceiling.
Note:
Never run the unit without both return air filters in
place. This will plug the unit evaporator coil with dirt and may
substantially degrade the performance of the unit over time.
B. Air Distribution Box Housing
1. Clean air distribution box housing and control panel
with a soft cloth dampened with a mild detergent.
Never use furniture polish or scouring powders.
C. Fan Motor
1. The blower motor is factory lubricated and requires
no service.
D. Frost Formation On Cooling Coil
1. Frost on a small portion of the coil is not unusual.
Under certain conditions, ice may form on the
evaporator coil. This is indicated by very cold output
at very low air speed and the icing can be seen
through the air inlet holes with the filters removed. If
this should occur, inspect the filter and clean if dirty.
Make sure air vents are open and not obstructed.
Units have a greater tendency to frost when the
outside temperature is relatively low. This may be
prevented by adjusting the thermostat control knob
to a warmer setting (counter clockwise). Should
frosting continue, operate on any
FAN
ONLY
setting
until the cooling coil is free of frost; then resume
normal operation. If frost condition persist, contact
your local service center for assistance.
2. On Outdoor Coil While Heating
a. Operation at low outdoor temperatures causes
low coil temperatures. This can result in ice
forming on the out door coil in certain conditions.
This is indicated by reduced heat output and
could fully stop fan rotation in extreme condi-
tions. To avoid this the system controls turn off
the compressor if out door temperature
drops below 5.6° C. and returns heating when
the temperature raises 2.8° C.
SERVICE-UNIT DOES NOT OPERATE
If your unit fails to operate or operates improperly, check
the following before calling your service center.
A.
If Caravan connected to motor generator, check to
be sure motor generator is running and producing
power.
B.
If Caravan connected to power supply by a land line,
check to be sure line is sized properly to run unit load
and it is plugged into power supply.
C.
Check your fuse or circuit breaker to see if it is open.
Insure fuse is not burnt, or circuit breaker is "ON" and
not activated.
D.
After the above checks, call your local service center
for further help. This unit must be serviced by qualified
service personnel only.
E.
If any wiring or supply cord is damaged and
needs to be replaced, it must be replaced by the
manufacturer or its service agent or a similarly quali-
fied person.
F.
When calling for service, always give the following:
1. Unit type and serial number found on identification
label located on base pan of unit bottom. (Remove
filter and view through network of holes)
2. Air distribution box model and serial number found
on rating plate located on ceiling template. Observe
this rating plate through the air distribution box right
side vent opening.
G.
Heater Element thermal reset (Type 3241 only) may
be performed by qualified personal with an electrically
insulated probe. See FIG. 18. The unit is disassembled
from above to facilitate this. The unit should be reviewed
at the time of reset to insure air flow is not blocked and
motor is functioning properly. Disconnect the 220 - 240
VAC power supply prior to performing this reset.
Disconnect 220 - 240 VAC. Failure to follow
these instructions could create a shock haz-
ard causing death or severe personal injury.
FIG 18