Installation Instructions

19
COOLING START-UP
NOTE: Check all manual reset limit controls in heating circuit if
cooling mode does not operate.
Compressor Protection Devices
The compressor includes components which are designed to
protect the compressor against abnormal operating conditions.
Refrigerant Charge Check (Units with Fixed Orifice Devices)
After completing airflow measurements and adjustments the unit’s re-
frigerant charge must be checked. The unit comes factory charged, but
this charge is based on 325 CFM per ton and minimum ESP per AHRI test
conditions (generally between .15 -.28 ESP). When air quantity or ESP is
different than above, the refrigerant charge must be adjusted to the
proper amount. All package units with fixed orifice devices are charged
using the super heat method at the compressor suction line.
After superheat is adjusted it is recommended to check unit sub-cooling
at the condenser coil liquid line out. For charge adjustments, see super-
heat and subcooling charts shown for each model.
MAINTENANCE
Have the gas heating section of the unit checked at least once a
year before the heating season begins, to be sure that the com-
bustion air inlet and flue outlet hoods are not blocked by debris,
which would prevent adequate combustion air and a properly
operating vent system.
FILTER REPLACEMENT OR CLEANING
A return air filter is not supplied with this unit; however, there
must be a means of filtering all of the return air. The filter(s) may
be located in the return air duct(s), or return air filter grille(s). Consult with your installing dealer for the actual location of the
return air filter(s) for your unit.
Dirty filters are the most common cause of inadequate heating or cooling performance. Filter inspection should be made at least
every two months; more often if necessary because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced with a new, clean filter. Dirty permanent filters should be washed with
water, thoroughly dried and sprayed with a filter adhesive before being reinstalled. (Filter adhesives may be found at many hardware
stores.) Permanent filters should last several years. However, should one become torn or uncleanable, it should be replaced.
CABINET FINISH MAINTENANCE
Use a fine grade automotive wax on the cabinet finish to maintain the finish’s original high luster. This is especially important in
installations with extended periods of direct sunlight.
CLEAN OUTSIDE COIL (QUALIFIED SERVICER ONLY)
The coil with the outside air flowing over it should be inspected annually and cleaned as frequently as necessary to keep the finned
areas free of lint, hair and debris.
CONDENSER, EVAPORATOR, AND INDUCED DRAFT MOTORS
Bearings on the air circulating blower motor, condenser motor and the combustion fan
motor are permanently lubricated. No additional oiling is required.
FLAME SENSOR (QUALIFIED SERVICER ONLY)
A drop in the flame current can be caused by a nearly invisible coating on the flame sensor.
This coating, created by the fuel or combustion air supply, can be removed by carefully
cleaning the flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should be stable and in the range of 4 - 6 microamps
DC.
FLUE PASSAGES (QUALIFIED SERVICER ONLY)
At the start of each heating season, inspect and, if necessary, clean the unit flue passage.
1. Shut off electric power and gas supply to the unit.
2. Remove burner assembly by disconnecting the gas line and removing the manifold bracket
from the partition panel.
Models # Superheat ± 3°F Subcooling ± 3°F
A/GPD1424***M41
10 11
A/GPD1430***M41
610
A/GPD1436***M41
11 10
A/GPD1437***M41
11 10
A/GPD1442***M41
815
A/GPD1448***M41
13 10
Design superheat & subcooling
@ 95 °F outdoor ambient temperature
Flame
Sensor
Flame Sensor