Lubrication, Manufacturer Lubricant | Carrier 48AY020-060, 48EW

Lubrication

COMPRESSORS — Each compressor is charged with the correct amount of oil at the factory. The correct oil charge is shown in Tables 1A and 1B. If oil is visible in the compressor sight glass, check unit for operating readiness as described in Start-Up section, then start the unit. Observe oil level and add oil, if required, to bring oil level in compressor crankcase up to between 1/4 and 1/3 of sight glass during steady operation.

If oil charge is above 1/3 sight glass, do not remove any oil until the compressor crankcase heater has been energized for at least 24 hours with compressor off.

When additional oil or a complete charge is required, use only Carrier-approved compressor oil:

Petroleum Specialties, Inc. . . . . . . . . . . . . . . . . . . . . . Cryol 150 Texaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capella WF-32 Witco Chemical Corp . . . . . . . . . . . . . . . . . . . . . . . Suniso 3GS

IMPORTANT: Do not use reclaimed oil or oil that has been exposed to the atmosphere. Refer to Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants sec- tion, for procedures to add or remove oil.

FAN SHAFT BEARINGS — Lubricate bearings at least ev- ery 6 months with suitable bearing grease. Do not over grease. Typical lubricants are given below:

MANUFACTURER	LUBRICANT
Texaco	Regal AFB-2*
Mobil	Mobilplex EP No. 1
Sunoco	Prestige 42
Texaco	Multifak 2

*Preferred lubricant because it contains rust and oxidation inhibitors.

CONDENSER- AND EVAPORATOR-FAN MOTOR BEARINGS — The condenser- and evaporator-fan motors have permanently-sealed bearings, so no field lubrication is necessary.

Evaporator Fan Performance Adjustment (Fig. 67) — Fan motor pulleys are designed for speed shown in Tables 1A and 1B (factory speed setting).

IMPORTANT: Check to ensure that the unit drive matches the duct static pressure using Tables 19-31.

To change fan speeds, change pulleys.

To align fan and motor pulleys:

1.Shut off unit power supply.

2.Loosen fan shaft pulley bushing.

3.Slide fan pulley along fan shaft.

4.Make angular alignment by loosening motor from mounting plate.

CENTER DRIVE

SHAFT

5.Retighten pulley.

6.Return power to the unit.

Fig. 67 — Evaporator-Fan Alignment

and Adjustment

Evaporator Fan Coupling Assembly — If the cou- pling has been removed for other blower assembly component repair or replacement, it is critical that the coupling be reassem- bled and aligned correctly to prevent premature failures.

REASSEMBLING THE COUPLING INTO THE UNIT (Fig. 68)

1.Prior to reassembling the coupling, loosen the 4 bearing mounting bolts, which secure the 2 bearings on either side of the coupling. Remove the drive belts.

2.Reassemble the coupling with the bearings loose. This al- lows the coupling to find its own self-alignment position.

3.Check the hub-to-shaft fit for close fitting clearances. Replace hubs if high clearances are determined.

4.Check the key for close-fitted clearances on the sides and 0.015 in. clearance over the top of the key. Replace key if necessary.

FLEX

SHAFT

BEARINGS

MEMBER

FLANGE

Fig. 68 — Evaporator Fan Coupling

48EJ, 48AJ, 48AK, 48EK, 48AY020-060 specifications

The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 are cutting-edge rooftop air conditioning units designed for commercial applications. These models are renowned for their reliability, energy efficiency, and innovative technologies aimed at providing optimal indoor comfort.

One of the standout features of these units is their advanced cooling and heating capabilities. They employ a multi-stage compressor system that allows for precise temperature control, accommodating various load requirements. This flexibility is particularly beneficial in commercial settings where the cooling load can fluctuate throughout the day.

Energy efficiency is paramount in today’s environmental landscape, and Carrier has ensured that these models meet stringent efficiency standards. They incorporate high-efficiency scroll compressors, which significantly reduce energy consumption while delivering powerful performance. The units are also equipped with variable speed fans that adjust airflow based on demand, further optimizing energy use.

In terms of construction, these rooftop units feature a robust design that enhances durability and longevity. The cabinet is constructed to withstand harsh weather conditions, ensuring reliable performance year-round. Additionally, the units are equipped with corrosion-resistant coatings, particularly useful in coastal environments where salt exposure can be a concern.

The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY models utilize advanced controls and connectivity features, allowing for easy integration into building management systems. This connectivity enables remote monitoring and control, facilitating quick response to changing conditions and simplifying maintenance tasks.

Noise reduction is another key characteristic of these models. They are designed with sound-absorbing insulation and low-noise fan blades to ensure quiet operation, making them suitable for noise-sensitive environments such as schools and hospitals.

These units are also available with various options for air filtration and dehumidification. The use of high-efficiency air filters enhances indoor air quality by trapping dust, pollen, and other airborne particles. Enhanced dehumidification capabilities ensure that spaces remain comfortable even in humid conditions.

In conclusion, the Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 rooftop units are engineered to offer exceptional performance, energy efficiency, and durability. With their advanced technologies and user-friendly features, they stand out as reliable solutions for meeting diverse commercial cooling and heating needs, making them a popular choice for many businesses.

Carrier 48AY020-060, 48EW, 48EY024-068, 48AW, 48EK, 48AK, 48AJ Lubrication, Manufacturer Lubricant

Models: 48EJ 48AJ 48AK 48EK 48AY020-060 48AW 48EY024-068 48EW