Carrier Z8075-105, ZN030-105, ZW, Z6, 48ZT, 48ZG specifications To Shut Unit OFF, Maintaining Your Unit

TO SHUT UNIT OFF

Do not turn off the electrical power to unit without first turning off the gas supply.

Never attempt to manually light the main burners on a unit with a match, lighter, or any other flame.

If the electric sparking device fails to light the main burn- ers, refer to the following shut off procedure, then call your dealer as soon as possible.

Failure to follow these procedures can result in serious fire or personal injury.

See Fig. 1 for location of gas valve(s). Refer to Fig. 3 while proceeding with the following steps.

1.Turn off the unit demand for cooling or heating by using the scrolling marquee. The scrolling marquee is located in the control box at the compressor end of the unit.

a.Push the ESCAPE key unit a blank display screen is shown.

b. Push the		key until the SERVICE TEST LED is
	lit.
c.	Push the	ENTER key. The display will show
	STOP.

d.Push the ENTER key again. The NO/YES display will flash.

e.Push the or key to toggle the display to

YES and then push ENTER . The unit will be

locked off from heating, cooling or any operation. The controls will still function and the display will still operate.

2.Close the field-installed manual gas shutoff valve.

3.Turn off the electrical power to the unit using the optional disconnect or the field-installed disconnect and lock off using proper lockout and tag-out procedures.

4.Open the burner section hinged access door.

5.Move the switch on the gas valves to the OFF position and wait 5 minutes before doing any service in the section or on the piping.

6.Close the burner section hinged access door.

7.If unit is being shut down because of a malfunction, call your dealer as soon as possible.

If unit is being shut down because the heating season has ended, restore electrical power to the unit and reset the scrolling marquee to Run mode to ensure operation of the cooling system during the cooling season.

IMPORTANT: Should overheating occur or the gas supply fail to shut off, shut off the manual gas valve to the unit before shutting off the electrical supply.

Do not use this unit if any part has been under water. Imme- diately call a qualified service technician to inspect the unit and to replace any part of the control system and gas control that has been under water.

MAINTAINING YOUR UNIT

All maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure.

For your safety, keep the gas heating area clear and free of combustible materials, gasoline, and other flammable liquids and vapors.

To ensure proper functioning of the unit, flow of combus- tion and ventilating air must not be obstructed from reaching the gas heating area. Clearance of at least 4 ft on all sides is required.

ROUTINE MAINTENANCE AND CARE

FOR THE EQUIPMENT OWNER

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

1.TURN OFF GAS SUPPLY FIRST AND THEN ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE.

2.Do not turn off electrical power to this unit without first turning off the gas supply.

3.When opening access doors or performing mainte- nance 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.

Failure to follow these procedures can result in serious fire or personal injury.

Air Filters — 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 hinged filter access door to replace or inspect the filters. All units have filter tracks into which the filters slide. Remove the filters by pulling outward from the track. See Fig. 4 for filter access door 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.

Table 1 — Indoor-Air Filter Data*

UNIT SIZE	FILTER TYPE	QUANTITY...Size
48Z		(in.)
	Disposable Fiberglass	8...20 x 25 x 2,
	(Standard) or Medium Effi-
		8...20 x 20 x 2
	ciency 30% Pleated (Optional)
030-050	90% Bag (Optional) with High-	6...20 x 24 x 22,
	Velocity Pre-Filters	6...20 x 20 x 22,
		12...16 x 20 x 2,
		3...20 x 24 x	2
	Disposable Fiberglass	12...20 x 25 x 2,
	(Standard) or Medium Effi-
		12...20 x 25 x	2
	ciency 30% Pleated (Optional)
055-070	90% Bag (Optional) with High-	6...24 x 20 x	22,
	Velocity Pre-Filters	6...24 x 24 x	22,
		6...20 x 24 x	2,
		6...24 x 24 x	2
	Disposable Fiberglass	12...20 x 25 x 2,
	(Standard) or Medium Effi-
		12...20 x 20 x	2
075	ciency 30% Pleated (Optional)
	High Efficiency 65% Pleated	12...20 x 25 x	2,
	(Optional)	12...20 x 20 x	2
	Disposable Fiberglass	12...20 x 25 x 2,
	(Standard) or Medium Effi-
		12...20 x 20 x	2
090,105	ciency 30% Pleated (Optional)
	High Efficiency 65% Pleated	12...20 x 25 x	2,
	(Optional)	12...20 x 20 x	2

*See base unit Installation Instructions if field-supplied or optional factory-supplied filters are used. When replacing filters, always use the same type and size originally supplied.

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