Charge; Dehumidification Mode - Carrier Infinity 480CEN024 Installation Instruction

MANIFOLD PIPE PLUG
Fig. 16 - Burner Assembly
C99019
on cooling airflow specified by the User Interface. The electronic air
cleaner terminal EAC- 1 is energized when the indoor blower motor
is operating.
When the "call for cooling" is satisfied, the R-to-Y circuit is
opened. The compressor and fan will stop, and the indoor blower
motor will continue operating at cooling airflow for an additional 90
seconds.
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R-410A refrigerant,
tested, and factory-sealed.
NOTE: Adjustment of the refrigerant charge is not required unless
the unit is suspected of not having the proper charge.
A subcooling charging chart is attached to the outside of the service
access panel. The chart includes the required liquid line temperature
at given discharge line pressures and outdoor ambient temperatures.
An accurate subcooling, thermocouple- or thermistor-type
thermometer, and a gauge manifold are required when using the
subcooling charging method for evaluating the unit charge. Do not
use mercury or small dial-type thermometers because they are not
adequate for this type of measurement.
BURNER FLAME
Fig. 17 - Monoport Burner
C99021
LIMIT SWITCHES
Normally closed limit switch (LS) completes the control circuit.
Should the leaving-air temperature rise above the maximum
allowable temperature, the limit switch opens and the control circuit
"breaks." Any interruption in the control circuit instantly doses the
gas valve and stops gas flow to the burners and pilot. The blower
motor continues to run until LS resets.
When the air temperature at the limit switch drops to the
low-temperature setting of the limit switch, the switch closes and
completes the control circuit. The direct-spark ignition system
cycles and the unit returns to normal heating operation.
ROLLOUT SWITCH
The function of the rollout switch is to close the main gas valve in
the event of flame rollout. The switch is located above the main
burners. When the temperature at the rollout switch reaches the
maximum allowable temperature, the control circuit trips, closing
the gas valve and stopping gas flow to the burners. The indoor
(evaporator) fan motor (IFM) and induced draft motor continue to
run until switch is reset. The IGC LED will display FAULT CODE
7.
COOLING MODE
The Infinity Control Board closes the R-to-Y circuit which starts
the compressor and outdoor fan and starts the indoor blower motor
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
When evaluating the refrigerant charge, an indicated
adjustment to the specified factory charge must always be very
minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
Proceed as follows:
1. Remove caps from low- and high-pressure service fittings.
2. Using hoses with valve core depressors, attach low- and
high-pressure gauge hoses to low- and high-pressure
service fittings, respectively.
3. Start unit in Cooling mode and let unit run until system
pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient-air temperature (°F db).
b. Liquid line temperature (°F).
c. Discharge (high-side) pressure (psig).
5. Using "Cooling Charging (;harts," compare outdoor-air
temperature(°F rib) with the discharge line pressure (psig) to
determine desired system operating liquid line temperature
(See Fig. 18).
6. Compare actual liquid line temperature with desired liquid
line temperature. Using a tolerance of -+2°F, add refrigerant
if actual temperature is more than 2°F higher than proper
liquid line temperature, or remove refrigerant if actual
temperature is more than 2°F lower than required liquid line
temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to the Check for Refrigerant Leaks section.
DEHUMIDIFICATION MODE
This Infinity system can be used to dehumidify the living space. See
User Interface Installation Instructions for more details.
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