Carrier 48XL User Manual download pdf (Page 28)

MAINTENANCE

To ensure continuing high performance, and to minimize the

possibility of premature equipment failure, periodic maintenance

must be performed on this equipment. This packaged unit should

be inspected at least once each year by a qualified service person.

To troubleshoot unit, refer to Table 10, Troubleshooting Chart,

NOTE TO EOUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

A. WARNING

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury or death and possible unit component damage.

The ability to properly perform maintenance on this

equipment requires certain expertise, mechanical skills,

tools and equipment. If you do not possess these, do not

attempt to perform any maintenance on this equipment,

other than those procedures recommended in the Owner’s

Manual.

^ WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow these warnings could result in personal

injury or death:

1, Turn off electrical power to the unit before performing

any maintenance or service on this unit,

2, Use extreme caution when removing panels and parts,

3, Never place anything combustible either on or in contact

with the unit.

A CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Errors made when reconnecting wires may cause improper

and dangerous operation. Label all wires prior to

disconnecting when servicing.

The minimum maintenance requirements for this equipment are as

follows:

1, Inspect air filter(s) each month. Clean or replace when

necessary.

2, Inspect indoor coil, drain pan, and condensate drain each

cooling season for cleanliness. Clean when necessary,

3, Inspect indoor fan motor and wheel for cleanliness each

cooling season. Clean when necessary.

4, Check electrical connections for tightness and controls for

proper operation each cooling season. Service when

necessary,

3, Check for restrictions on inducer outlet. Clean flue hood,

6, Inspect burner compartment before each heating season for

rust, corrosion, soot or excessive dust.

7, Inspect all accessories. Perform any service or maintenance

to the accessories as recommended in the accessory

instructions.

Air Filter

IMPORTANT: Never operate the unit without a suitable air filter

in the return-air duct system. Always replace the filter with the

same dimensional size and type as originally installed. See Table 1

for recommended filter sizes.

Inspect air filter(s) at least once each month and replace

(throwaway-type) or clean (cleanable-type) at least twice during

each cooling season and twice during the heating season, or

whenever the filter becomes clogged with dust and lint.

Indoor Fan and Motor

NOTE: All motors are pre-lubricated. Do not attempt to lubricate

these motors.

For longer life, operating economy, and continuing efficiency,

clean accumulated dirt and grease from the blower wheel and

motor annually.

Inducer Blower

NOTE: All motors are pre-lubricated. Do not attempt to lubricate

these motors.

Clean periodically to assure proper airflow and heating efficiency.

Inspect blower wheel every fall and periodically during the heating

season. For the first heating season, inspect blower wheel

bi-monthly to determine proper cleaning frequency.

Limit Switch

Remove unit access panel to gain access to the limit switch. The

limit switch is located above the indoor blower housing.

NOTE: On small chassis units, a second limit switch is located

beside the indoor blower housing.

Burner Ignition

Unit is equipped with a direct spark ignition 100 percent lockout

system. Ignition module is located in the control box. Refer to

additional information in the Start-Up & Troubleshooting section

for Status Code information.

Main Burners

At the beginning of each heating season, inspect for deterioration

or blockage due to corrosion or other causes. Observe the main

burner flames and adjust, if necessary.

A CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

When servicing gas train, do not hit or plug orifice spuds.

Removal of Gas Train

To remove the gas train for servicing:

1, Shut off main gas valve,

2, Shut off power to unit,

3, Remove unit access panel.

4, Disconnect gas piping at unit gas valve,

3, Remove wires connected to gas valve. Mark each wire.

6, Remove ignitor and sensor wires at the ignitor module,

7, Remove the mounting screw that attaches the burner rack to

the unit base.

8, Slide the burner rack out of the unit,

9, To reinstall, reverse the procedure outlined above.

Inducer Pressure Switch

Inspect pressure switch connections. Inspect pressure switch tube

for cracks or restrictions. Replace if needed.

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Carrier 48XL User Manual Page 28

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