SEPARATE THE VAPORIZER FROM THE CON- DENSER — The VFD mounting brackets (Fig. 24) extend beyond the outboard edge of the vaporizer. The vaporizer extends beyond the perimeter of the condenser tubesheet.

1.Cut the vaporizer hot gas supply line near the oil concen- trator (Fig. 24).

2.Cut the vaporizer hot gas return line (Fig. 24).

3.Cut the bearing oil drain line near the oil sump (Fig. 25).

4.Unbolt the vaporizer vent line flange shown in Fig. 25.

5.Cut the oil supply line as shown in Fig. 25.

6.Cut the oil reclaim line as shown in Fig. 25.

7.Disconnect all wires and cable leads to the vaporizer assembly (see Fig 26) including:

a.oil sump temperature sensor

b.oil sump pressure cable and oil pressure leaving filter cable

c.oil reclaim cable

d.vaporizer heater cable in the vaporizer heater junction box

e.oil pump cable

f.oil sump heater conduit (Fig. 24)

g.vaporizer temperature sensor

8.Rig the vaporizer with the lifting points on the vaporizer mounting bracket and remove the four bolts that secure it to the condenser (Fig. 24).

9.Cover all openings.

NOTE: To reassemble, follow steps in reverse order. Connect sensors and cables after major components have been secured to reduce the risk damaging them.

VFD Installation

1.Install terminal box frame mounting studs into tapped holes using short threaded end (see section E-E in Fig. 27). Do not exceed 120 ft-lb (163 N-m).

2.Install thermal insulators, insulation frame assembly, and terminal box frame prior to attaching motor power cables.

3.Torque motor terminals to 45 to 55 ft-lb (61 to 75 N-m).

4.There may be 1 or 2 motor power cables per terminal identified as T1, T2 and T3. Position motor end lugs on terminal studs with Belleville washer located against the front terminal lug with the convex side facing toward the front terminal nut. Clinch the two cables together with wire ties before tightening terminal nuts. Install front ter- minal nut finger tight. Hold front terminal nut stationary while tightening rear terminal nut to 45 to 50 ft-lb (61 to 68 N-m). (See Fig. 28.)

5.Check all terminal connections for proper installation.

IMPORTANT: Do not insulate terminals until wiring arrangement has been checked and approved by Carrier start-up personnel. Motor terminals must be insulated in acceptance with national and local electri- cal codes.

VAPORIZER

MOUNTING

BOLTS

VAPORIZER HOT GAS SUPPLY LINE

a23-1573

VFD MOUNTING

BRACKETS

VAPORIZER HEATER JUNCTION BOX

OIL PRESSURE REGULATOR ISOLATION VALVE

OIL SUMP

HEATER JUNCTION

BOX

OIL RECLAIM ACTUATOR

VAPORIZER

MOUNTING

BOLTS

VAPORIZER

REFRIGERANT

RETURN LINE

OIL PUMP

JUNCTION BOX (HIDDEN)

Fig. 24 — Oil Concentrator Removal

19

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Carrier HFC-134A installation instructions Oil Concentrator Removal, A23-1573
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HFC-134A specifications

Carrier HFC-134A, also known as tetrafluoroethane, is a hydrofluorocarbon (HFC) refrigerant widely used in a variety of cooling and heating applications. It is recognized for its role in refrigeration and air conditioning systems, making it a crucial component in many modern HVAC units. One of the key features of HFC-134A is its zero ozone depletion potential, which makes it an environmentally friendly alternative to older refrigerants like CFCs and HCFCs.

The characteristics of HFC-134A include its stability, non-corrosiveness, and effectiveness at low temperatures. These properties allow it to perform efficiently in both residential and commercial refrigeration systems. The refrigerant operates within a temperature range that is ideal for many applications, including food preservation and air conditioning. HFC-134A's thermodynamic properties enable it to absorb and release heat effectively, making it suitable for both vapor-compression and absorption refrigeration cycles.

From a technological perspective, the use of HFC-134A aligned with the transition to more sustainable refrigerants. As global environmental regulations have tightened, manufacturers have shifted towards refrigerants with lower global warming potential (GWP). HFC-134A has a GWP of approximately 1,430, which is lower than many of its predecessors but still higher than some newer alternatives. This aspect drives ongoing research and development in the industry, aiming to create even more environmentally sound refrigerants.

Carrier HFC-134A is compatible with various lubricants and can be integrated into systems designed for other refrigerants with minimal modifications. This flexibility allows for a smoother transition within existing installations as businesses and homeowners upgrade their HVAC systems to comply with environmental regulations.

In summary, Carrier HFC-134A plays a significant role in modern refrigeration and air conditioning technology. Its main features, including zero ozone depletion potential, stability, and efficiency, contribute to its widespread use in various applications. As the industry continues to evolve, the focus on reducing the environmental impact of refrigerants will undoubtedly influence the future direction of HFC-134A usage and the development of new alternatives.
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