Carrier Air Conditioner specifications Service, Electronic Components, Oil Charge

SERVICE

ELECTRIC SHOCK HAZARD.

Turn off all power to unit before servicing. The ENABLE/OFF/REMOTE CONTACT switch on control panel does not shut off con- trol power; use field disconnect.

Electronic Components

CONTROL COMPONENTS — Unit uses an advanced elec- tronic control system that normally does not require service. For details on controls refer to Operating Data section.

30GTN,R AND 30GUN,R 040-110, AND 230B-315B UNIT CONTROL BOX — When facing compressors, main control box is at left end of unit. All incoming power enters through main box. Control box contains power components and electronic controls.

Outer panels are hinged and latched for easy opening. Re- move screws to remove inner panels. Outer panels can be held open for service and inspection by using door retainer on each panel. To use door retainers: remove bottom pin from door re- tainer assembly, swing retainer out horizontally, and engage pin in one of the retainer ears and the hinge assembly.

30GTN,R AND 30GUN,R 130-210, 230A-315A, AND 330A/B-420A/B UNIT CONTROL AND MAIN POWER BOXES — The main power box is on the cooler side of the unit, and the control box is on the compressor side. Outer pan- els are hinged and latched for easy opening. Remove screws to remove inner panels.

Compressors — If lead compressor on either refrigerant circuit becomes inoperative for any reason, circuit is locked off and cannot be operated due to features built into the electronic control system. Do not attempt to bypass controls to force com- pressors to run.

COMPRESSOR REMOVAL — Access to the oil pump end of the compressor is from the compressor side of the unit. Ac- cess to the motor end of the compressor is from the inside of the unit. All compressors can be removed from the compressor side of the unit.

IMPORTANT: All compressor mounting hardware and support brackets removed during servicing must be rein- stalled prior to start-up.

Following the installation of the new compressor:

Tighten discharge valves to —
	Compressor(s)
20 to 25 ft-lb (27 to 34 N-m)	06E250
80 to 90 ft-lb (109 to 122 N-m)	06E265,275,299
Tighten suction valves to —
80 to 90 ft-lb (109 to 122 N-m)	06E250
90 to 120 ft-lb (122 to 163 N-m)	06E265,275,299
Tighten the following fittings to —
120 in.-lb (13.5 N-m)	High-Pressure Switch

OIL CHARGE (Refer to Table 30) — All units are factory charged with oil. Acceptable oil level for each compressor is from 1/8 to 3/8-in. of sight glass (see Fig. 35).

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

30GTN,R approved oils are as follows:

Petroleum Specialties, Inc. — Cryol 150 (factory oil charge)

Texaco, Inc.	— Capella WF-32
Witco Chemical Co.	— Suniso 3GS

30GUN,R approved polyolester (POE) oils are as follows:

•Mobil Artic EAL 68

•Castrol SW68

•ICI Emkarate RL68H

•Lubrizol 29168 (Texaco HFC Capella 68NA)

•CPI Solest 68

Table 30 — Oil Charge

COMPRESSOR		OIL REQUIRED
	Pts		L
06E250	14		6.6
06E265	19		9.0
06E275	19		9.0
06E299	19		9.0

Do not reuse drained oil or any oil that has been exposed to atmosphere.

Cooler — The cooler is easily accessible from the cooler side of the unit. The refrigerant feed components are accessible from the control box end of the unit.

COOLER REMOVAL — Cooler can be removed from the cooler side of the unit as follows:

Open and tag all electrical disconnects before any work begins. Note that cooler is heavy and both fluid-side and refrigerant-side may be under pressure.

1.To ensure the refrigerant is in the condenser, follow this procedure:

a.Open the circuit breakers and close the discharge valves for the lag compressors in both circuits.

Do not close the discharge valve of an operating compres- sor. Severe damage to the compressor can result.

b.After the lag compressor discharge service valves have been closed, close the liquid line service valve for one circuit. Allow the lead compressor to pump down that circuit until it reaches approxi- mately 10 to 15 psig (68.8 to 103.2 kPa).

c.As soon as the system reaches that pressure, shut down the lead compressor by opening the com- pressor circuit breaker, then quickly close the dis- charge service valve for that compressor.

d.Repeat the procedure for the other circuit.

2.Close the shutoff valves, if installed, in the cooler fluid lines. Remove the cooler fluid piping.

3.Cooler may be under pressure. Open the air vent at the top of the cooler, and open the drain on the bottom of the cooler (near the leaving fluid outlet) to drain the cooler. Both the drain and the air vent are located on the leaving fluid end of cooler. See Fig. 24. Remove the cooler water- side strainer.

4.Disconnect the conduit and cooler heater wires, if equipped. Remove all thermistors from the cooler, being sure to label all thermistors as they are removed. Ther- mistor T1 is a well-type thermistor, and thermistor T2 is immersed directly in the fluid. See Fig. 24.

5.Remove the insulation on the refrigerant connection end of the cooler.

6.Unbolt the suction flanges from the cooler head. Save the bolts.

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