Carrier 48PG20---28 Routine Maintenance And Care, For The Equipment Owner, Fire, Explosion Hazard

ROUTINE MAINTENANCE AND CARE

FOR THE EQUIPMENT OWNER

Before proceeding with those things you might want to maintain yourself, please carefully consider the following:

!WARNING

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

1.Turn off gas supply and electrical power to your unit before servicing or performing maintenance.

2.Do not turn off electrical power to this unit without first turning off gas supply and apply lockout tags.

3.When removing access doors or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care has been taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit.

Air Filter(s)

Air filters should be checked at least every 3 or 4 weeks and changed or cleaned whenever they become dirty. Table 1 indicates the correct filter size for your unit. Open the filter access panel to replace or inspect the filters. All units have filter tracks into which the filters slide. Remove the filters by pulling the filter slide outward from the track. See Fig. 6 for filter access panel location. Note the direction of flow arrows on the filter frame.

If you have difficulty in locating your air filter in the return-air duct system, or if you have questions concerning proper filter maintenance, contact your dealer for instructions. When replacing your unit filters, always use the same size and type of filter that was originally supplied by the installer. Filter tracks are field convertible for 2 or 4-in. thick filters. Verify airflow and duct static values and related motor sizing and belt drive adjustment, if filter type or efficiency rating is changed from the original installation.

Units with outdoor air capability have cleanable filters for the outdoor air. These filters should be checked quarterly and cleaned as necessary. Remove by pulling out the middle of the hood top. Push up on the center filter and then remove. Slide the other filters to the center and repeat.

!WARNING

FIRE AND EQUIPMENT DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Never operate unit without filters in place. Damage to blower motor and/or compressors could result. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and in some cases, fire.

	Table 1 – Indoor Air Filter Data
UNIT		QUANTITY...SIZE
48HG,HJ,	TYPE OF FILTER
		(in.)
PG, PM
014--- 024	Standard Throwaway, Optional	9...16 x 25 x 2
and 16--- 24	30%, or Accessory 65% Pleated
028 and 28	Standard Throwaway, Optional	9...20 x 25 x 2
	30%, or Accessory 65% Pleated

PULL OUT CENTER OF

HOOD TO RELEASE OUTDOOR AIR

FILTER FROM TRACK

CONTROL BOX	INDOOR MOTOR
ACCESS DOOR	ACCESS DOOR

FILTER	HEAT
ACCESS	SECTION
DOOR	ACCESS	GAS VALVE
	PANEL	CONNECTION

C07352

Fig. 6 - Panel and Filter Locations

Alarm Status

(Units with ComfortLinkt Controls)

The Scrolling Marquee display incorporates an Alarm Status LED that turns on to indicate an active alarm or alert. These alarms and alerts are in addition to those that are indicated by the Integrated Gas Control (IGC). The ComfortLink control active alarm codes and alarm history can be viewed with the Scrolling Marquee or other Carrier Comfort Networkr (CCN) devices. Alarms may also be configured to broadcast automatically on CCN. If the unit will not operate and the Alarm Status LED is on, contact the local dealer and request service.

Integrated Gas Controller (IGC)

The IGC board incorporates an LED that emits a flashing light to indicate an alarm code. If the furnace section will not operate and the LED is flashing a code (1 to 9 flashes in succession), contact your dealer and request service. (See Fig. 1.)

NOTE: Make note of the flash code before powering off the unit. The alarm codes clear after power cycle.

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