Carrier 38GXC, 40GXQ Safety Considerations, General, System Requirements, Refrigerant Charge

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equipment can be hazardous due to system pressures, electrical components, and equipment location (roofs, elevated structures, etc.).

Only trained, qualified installers and service mechanics should install, start-up, and service this equipment.

Untrained personnel can perform basic maintenance functions such as cleaning coils. All other operations should be performed by trained service personnel.

When working on the equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment.

Follow all safety codes. Wear safety glasses and work gloves. Keep quenching cloth and fire extinguisher nearby when brazing. Use care in handling, rigging, and setting bulky equipment.

Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and current editions of the National Electrical Code ( NEC ) NFPA 70. In Canada, refer to current editions of the Canadian electrical code CSA 22.1.

Recognize safety information. This is the safety-alert symbol !! . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.

!CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Do not bury more than 36 in. (914 mm) of refrigerant pipe in the ground. If any section of pipe is buried, there must be a 6 in. (152 mm) vertical rise to the valve connections on the outdoor units. If more than the recommended length is buried, refrigerant may migrate to the cooler buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

GENERAL

These instructions cover the installation, start-up and servicing of 38GXC(Q) outdoor and 40GXC(Q) indoor units duct free systems.

SYSTEM REQUIREMENTS

Allow sufficient space for airflow and servicing unit. See Fig. 2 and 3 for minimum required distances between unit and walls or ceilings.

Piping

IMPORTANT: Both refrigerant lines must be insulated separately.

SMinimum refrigerant line length between the indoor and outdoor

units is 10 ft. (3 m).

SThe following maximum lengths are allowed:

REFRIGERANT LINE LENGTHS ft. (m)

Unit Size	Max Line Length	Max Elevation	Max Elevation
		(ID over OD)	(OD over ID)
9 & 12K	65 (20)	35 (11)	35 (11)
18K	80 (25)	50 (15)	50 (15)
24K	100 (30)	50 (15)	50 (15)

SThe following are the piping sizes.

PIPE SIZES

Unit Size	Mix Phase	Vapor
9, 12 & 18K	1/4”	1/2”
24K	3/8”	5/8”

Refrigerant Charge

	REFRIGERANT CHARGE
Unit Size		Amount of Charge lb. (kg)
9 K		2.65 (1.2)
12 K		2.8 (1.27)
18 K		3.5 (1.6)
24 K		5.4 (2.5)

SAbove charge is for piping runs up to 25 ft. (7.6 m).

SFor piping runs greater than 25 ft. (7.6 m), add 0.1 oz. of refrigerant per foot of extra piping up to the allowable length.

SCapillary tubes are used as metering devices.

Connecting (Power and Control Cable)

SThe main power is supplied to the outdoor unit. The field supplied connecting cable from the outdoor unit to indoor unit consists of four wires and provides the power for the indoor unit as well as the communication signal and ground between the outdoor and indoor unit.

Two wires are high voltage AC power, one is low voltage and one is a ground wire.

SConsult local building codes, NEC (National Electrical Code) or CEC (Canadian Electrical Code) for special requirements.

Model Size	Power Source			MIN CKT AMP
				MAX FUSE/CB
				AMP
9 K	115 ---	1 ---	60	20/25
12 K	115 ---	1 ---	60	20/25
12 K	208/230	--- 1	--- 60	10/15
18 K	208/230	--- 1	--- 60	14/25
24 K	208/230	--- 1	--- 60	16/30

SConnecting Cable: Voltage drop on the connecting cable should be kept to a minimum. Do not use thermostat wire. Use cable size and max length below:

18 AWG	50 Feet (16 m)
16 AWG	65 Feet (19.8 m)
14 AWG	>65 Feet (19.8 m)

38/40GXC(Q)

3