Carrier INFINITIR 15 SEER 48XT-A Installation Instructions Manual Download

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Inducer Pressure Switch

Inspect pressure switch connections. Inspect pressure switch tube
for cracks or restrictions. Replace if needed.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Disconnect and tag electrical power to the unit before

cleaning and lubricating the blower motor and wheel.

WARNING

Outdoor Coil, Indoor Coil, and Condensate

Drain Pan

Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all

obstructions, including weeds and shrubs, that interfere with the

airflow through the condenser coil. Straighten bent fins with a fin
comb. If coated with dirt or lint, clean the coils with a vacuum

cleaner, using the soft brush attachment. Be careful not to bend the
fins. If coated with oil or grease, clean the coils with a mild

detergent and water solution. Rinse coils with clear water, using a

garden hose. Be careful not to splash water on motors, insulation,
wiring, or air filter(s). For best results, spray condenser coil fins

from inside to outside the unit. On units with an outer and inner
condenser coil, be sure to clean between the coils. Be sure to flush

all dirt and debris from the unit base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing all

foreign matter from the pan. Flush the pan and drain trough with
clear water. Do not splash water on the insulation, motor, wiring, or

air filter(s). If the drain trough is restricted, clear it with a
“plumbers snake” or similar probe device.

Outdoor Fan

UNIT OPERATION HAZARD

Failure to follow this caution may result in damage to unit

components.
Keep the outdoor fan free from all obstructions to ensure

proper cooling operation. Never place articles on top of the

unit.

CAUTION

1. Remove 4 screws holding outdoor grille and motor to top

cover.

2. Turn motor/grille assembly upside down on top cover to

expose fan blade.

3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off

motor shaft.

5. When replacing fan blade, position blade according to the

table shown in Fig. 25.

6. Ensure that set screw engages the flat area on the motor

shaft when tightening.

7. Replace grille.

Infinity Top

A06035

UNIT SIZE

“A” DIM. IN. (MM)

1 (26)

11/32 (9)

9/16 (14)

Fig. 25 -- Outdoor Fan Blade Clearance

Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panel to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten all screw

connections. If any smoky or burned connections are noticed,

disassemble the connection, clean all the parts, re--strip the wire
end and reassemble the connection properly and securely.
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling

cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check

each

electrical

component

with

the

proper

electrical

instrumentation. Refer to the unit wiring label when making these
checks.

Refrigerant Circuit

Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a

refrigerant leak.
If oil is detected or if low performance is suspected, leak test all
refrigerant tubing using an electronic leak detector, or liquid--soap

solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,

refer to Checking and Adjusting Refrigerant Charge section.

Indoor Airflow

The heating and/or cooling airflow does not require checking

unless improper performance is suspected. If a problem exists, be
sure that all supply-- and return--air grilles are open and free from

obstructions, and that the air filter is clean.

Metering Devices--TXV & AccuRater

Piston

This unit uses 2 types of metering devices. The outdoor metering
device is a fixed orifice and is contained in the brass--hex body in

the liquid line feeding the outdoor coils. The indoor metering
device is a TXV--type device. No maintenance should be required.

Pressure Switches -- Refrigerant Circuit

Pressure switches are protective devices integrated into the control

circuit (low voltage). They shut off compressor if abnormally high
or low pressures are present in the refrigeration circuit. These