Carrier 30XW150-400 Unit Oil Quantities, A30-4842, Typical Oil System, Typical 06T Compressor

Compressor Assembly — The 30XW units utilize screw compressors with a modulating slide valve which varies capacity from 15% to 100% of compressor capacity for each circuit. See Fig. 45 for a view of a typical 06T compressor. The slide valve position is varied by opening and closing the 2 solenoid valves located on the compressor. To unload the compressor, both solenoids are deenergized. To increase in capacity both solenoid valves are energized together which will cause the slide valve to slide towards the fully loaded posi- tion. To stop the loading process solenoid 2 is energized and solenoid 1 is deenergized. This will cause the slide valve to maintain its current position. There is no feedback for the posi- tion of the slide valve. The control utilizes compressor current as an indicator of the slide valve position. Once the calculated position of the slide valve reaches 100% circuit capacity, the control will try to increase capacity again if the compressor current continues to increase. The control will continue to load the compressor until the compressor current no longer increases. At that time the control will energize both solenoids and the circuit will be considered fully loaded.

COMPRESSOR OIL SYSTEM — Each compressor/circuit has its own oil system which includes an oil filter, oil solenoid, check valve, oil level switch, oil pressure transducer, and an oil shut-off valve. A typical oil system is shown in Fig. 46. See Table 42.

8

6

7

1

2

3

4

5

LEGEND

Table 42 — Unit Oil Quantities

30XW UNIT SIZE	OIL CHANGE (gal, [liters])
	Circuit A	Circuit B
150-200	6.0 [22.7]	—
325-400	5.0 [18.9]	5.0 [18.9]

DISCHARGE

GAS THERMISTOR

ACCESS

FITTING

	1	— Oil Pressure Transducer
	2	— Oil Solenoid
	3	— Oil Filter
	4	— 1/4 in. FL (Female) Access Fitting
A30-4842	5	— Shut-Off Valve
	6	— Oil Level Sight Glass
	7	— Oil Level Switch
	8	— 1/4 in. FL (Female) Access Fitting

Fig. 46 — Typical Oil System

SUCTION

TEMPERATURE

MOTOR TEMPERATURE

SENSOR 1

COMMON

MOTOR TEMPERATURE

SENSOR 2

HIGH PRESSURE	SOLENOID 1
SWITCH	SOLENOID 2

Unloader Piston
Chamber		Compression
		Process
High with
High
Pressure	Discharge	Slide Valve
Oil	Port
		Loaded Position

		Unloader Piston
		Chamber
		Compression
		Process
Drain to	Low Pressure	Discharge
		Port
		x
		Slide Valve
		Unloaded Position

Unloader Piston

Chamber

Trapped

Oil at

High

Pressure

Compression

Process

Slide Valve

Discharge

Port

Part Load Position

Bleed Line to Low Pressure Suction

High Pressure Oil

Energized	Energized
NO FLOW	FLOW
Valve #2 (NO)	Valve #1 (NC)

Bleed Line to Low Pressure Suction

High Pressure Oil

De-energized	De-energized
FLOW	NO FLOW
Valve #2 (NO)	Valve #1 (NC)

		Bleed Line to Low Pressure Suction
			High Pressure Oil
Energized	De-energized
NO FLOW	NO FLOW
Valve #2 (NO)	Valve #1 (NC)

FULLY LOADED OPERATION

FULLY UNLOADED OPERATION	MAINTAIN POSITION
	A30-4841

Fig. 45 — Typical 06T Compressor

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