12
6. Set the thermostat to Cool mode and slowly
lower the cooling temperature until the unit starts.
The compressor, blower and fan should now be
operating. Allow the unit to run 10 minutes, make
sure cool air is being supplied by the unit.
7. Check that the compressor is operating correctly.
The scroll compressors in these units MUST operate
in the proper rotation. To ensure the compressors
are operating in the correct direction, check the
compressor discharge line pressure or temperature
after the compressor is started. The discharge
pressure and discharge line temperature should
increase. If this does not occur and the compressor
is producing an exceptional amount of noise,this
indicates that there is a phasing issue. Perform the
following to correct:
7.1 Turn power to the unit OFF.
7.2 Switch any two leads of power supply at unit
Single Point Power Block.
7.3 Turn power to the unit ON.
7.4 Perform step 7 again.
8. Turn the temperature setting to the highest position,
stopping the unit. The indoor blower will continue to
run for 60 seconds.
9. Turn the thermostat system switch to “OFF” and
disconnect all power when servicing the unit.
NOTE: The compressor has 180 second re-start
delay on timer to avoid short cycling.
WARNING
HIGH VOLTAGE!
Disconnect all power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
Final System Checks
10.
Check to see if all supply and return air grilles are
adjusted and the air distribution system is balanced
for the best compromise between heating and
cooling.
11. Check for air leaks in the ductwork. See Sections on
Air Flow Adjustments.
12. Make sure the unit is free of “rattles”, and the tubing
in the unit is free from excessive vibration. Also
make sure tubes or lines are not rubbing against
each other or sheet metal surfaces or edges. If so,
correct the trouble.
13.
Set the thermostat at the appropriate setting for
cooling and heating or automatic changeover for
normal use.
14. Be sure the Owner is instructed on the unit
operation, filter, servicing, correct thermostat
operation, etc.
Refrigeration Performance Check
Check that compressor RLA corresponds to values shown
in Appendix B. RLA draw can be much lower than values
listed at low load conditions and low ambient condensing
temperatures. Values in Appendix B can slightly exceed
at high load conditions and high ambient condensing
temperatures.
MAINTENANCE
WARNING
HIGH VOLTAGE!
Disconnect all power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
WARNING
To prevent personal injury or death due to improper in-
stallation, adjustment, alteration, service or maintenance,
refer to this manual. For additional assistance or informa-
tion, consult a qualified installer, servicer agency or the
gas supplier.
CAUTION
Sheet metal parts, screws, clips and similar items inherently
have sharp edges, and it is necessary that the installer and
service personnel exercise caution.
The Self Contained Packaged Air Conditioner should
operate for many years without excessive service calls if
the unit is installed properly. However it is recommended
that the owner inspect the unit before a seasonal start up.
The coils should be free of debris so adequate airflow is
achieved. The return and supply registers should be free of
any obstructions. The filters should be cleaned or replaced.
These few steps will help to keep the product up time to a
maximum. The Service section that follows should help in
identifying problems if the unit does not operate properly.
CAUTION
To prevent property damage due to fire and loss of equip-
ment efficiency or equipment damage due to dust and lint
build up on internal parts, never operate unit without an air
filter installed in the return air system.
Filters
Every application may require a different frequency of
replacement of dirty filters. Filters must be replaced at least
every three (3) months during operating seasons.
