Check the limit control operation after 15 minutes of operation.
1. Block the return air grille(s).
2. After several minutes, the main burners must go off. The
circulating air blower will continue to run.
3. Remove air restrictions and main burners will relight after a
cool down period of a few minutes.
4. Adjust the thermostat setting below room temperature.
5. The main burners must go off.
6. The circulating air blower will continue to run for 120, 135 or
150 seconds, depending on the setting.
NOTE: On the WGGE4348,60 model only, the circulating air
blower will continue to run for 180 seconds.
NOTE: If necessary, adjust the fan off-delay settings to obtain
satisfactory comfort level.
This unit must not be used as a "construction heater"
during the finishing phases of construction on a new
structure. This type of use may result in premature failure
of the unit due to extremely low return air temperatures
and exposure to corrosive or very dirty atmospheres.
1. Set the thermostat to the lowest setting.
2. Turn off the electrical power supply to the unit.
3. Remove the heat exchanger door on the side of the unit by
removing the screws.
4. Move the gas control valve switch to the OFF position.
NOTE: Do not force.
5. Close the manual gas shutoff valve external to the unit.
6. Replace the heat exchanger door on the unit.
7. If cooling and/or air circulation will be desired, turn on the
NOTE: Check all manual reset limit controls in the heating circuit
if the cooling mode does not operate.
Compressor Protection Devices
The compressor includes components which are designed to
protect the compressor against abnormal operating conditions.
To prevent property damage, personal injury or death,
due to fire, explosions, smoke, soot, condensation,
electric shock or carbon monoxide, this unit must be
properly installed, repaired, operated and maintained.
Refrigerant Charge Check—Units with Fixed Orifice
After completing the airflow measurements and adjustments, the
unit's refrigerant charge must be checked. The unit comes
factory charged, but this charge is based on 325 CFM per ton
and minimum ESP per ARI test conditions (generally between
0.15 to 0.25 ESP). When air quantity or ESP is different than
above, the refrigerant charge must be adjusted to the proper
All package units with fixed orifice devices are charged using the
superheat method at the compressor suction line.
For charging in the warmer months, 8ºF ± 3ºF superheat at the
compressor is required at conditions 95ºF (35ºC) outdoor
ambient (dry bulb) temperature, 80ºF (27ºC) dry bulb / 67ºF
(19ºC) wet bulb indoor ambient temperature, approximately 50%
humidity. This superheat varies when conditions vary from the
After superheat is adjusted, it is recommended that subcooling
be checked at the condenser coil liquid line out. In most
operating conditions 10ºF to 15ºF of subcooling is adequate.
Cooling Refrigerant Charging—Models with TXV
Check the unit charge before putting the cooling section into full
operation. The unit is factory-charged with R-410A for nominal
airflow and static pressure conditions. The unit has a
thermostatic expansion valve (TXV) metering device. To ensure
that the unit is properly charged for the intended application,
check the unit refrigerant subcooling at the condenser. The
refrigerant subcooling is a function of outdoor ambient
temperature and return air temperature of the conditioned space.
It is the installing contractors responsibility to ensure that the
proper refrigerant subcooling at the condenser is adjusted for
each application. For example, 10ºF refrigerant subcooling level
is adequate for a 95ºF (35ºC) outdoor ambient temperature and
for a 78ºF to 80ºF (26ºC to 27ºC) indoor return air temperature.
As the outdoor ambient temperature rises, the subcooling
decreases, and as the outdoor ambient temperature lowers, the
NOTE: Proper subcooling adjustment optimizes cooling