Safety Considerations, General, System Requirements

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
Unit Size	Max Line Length	(ID over OD)	(OD over ID)
		(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
Model Size	Power Source			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)

38GXC, 38GXQ, 40GXC, 40GXQ specifications

Carrier's 40GXQ, 38GXQ, 38GXC, and 40GXC series are a testament to the brand’s commitment to innovation and excellence in HVAC technology. These units are designed to meet the diverse needs of commercial and residential applications while ensuring optimal performance, energy efficiency, and sustainability.

The 40GXQ model stands out for its advanced cooling capabilities and high efficiency. This rooftop unit employs a high-efficiency scroll compressor that enhances performance while minimizing energy consumption. With a cooling capacity ranging from 3 to 20 tons, the 40GXQ is ideal for larger spaces requiring significant cooling load management. It also features a user-friendly interface, allowing for easy adjustments and monitoring through a digital display.

The 38GXQ is particularly notable for its versatility and robust design. Featuring an integrated economizer, the 38GXQ allows for enhanced energy savings by leveraging outdoor air for free cooling when conditions permit. This model is equipped with high-efficiency filters that improve indoor air quality, making it suitable for applications in schools, offices, and healthcare facilities.

The 38GXC variant is designed for residential applications and emphasizes whisper-quiet operation without compromising performance. Its high SEER (Seasonal Energy Efficiency Ratio) rating means homeowners can enjoy substantial savings on their energy bills. The 38GXC is also equipped with Carrier's Greenspeed intelligence, which enables the system to modulate its output, maintaining comfort levels while reducing energy consumption.

The 40GXC model represents innovation in temperature control systems. With its sleek design and advanced variable-speed compressor, the 40GXC can adapt to changing conditions while maintaining efficiency and performance. This model also incorporates advanced monitoring systems that provide real-time data on performance and diagnostics, ensuring optimum efficiency throughout its lifecycle.

All these Carrier models are equipped with advanced refrigerant management systems, supporting environmentally friendly refrigerants that adhere to current environmental regulations. They not only provide effective cooling solutions but also contribute to a sustainable future, aligning with Carrier’s broader commitment to reducing carbon footprints.

In summary, the Carrier 40GXQ, 38GXQ, 38GXC, and 40GXC are engineered to deliver exceptional performance, energy efficiency, and versatility across various applications. With advanced technologies and a commitment to sustainability, these units set a high standard in the HVAC industry. Whether for commercial or residential use, these models provide reliable and efficient climate control solutions.