Carrier 09RH Weight Distribution, Compressor Units See drawing, Table, Nema Frame Size

Table 15 — Weight Distribution, Compressor

Units (See drawing, Table 14)

COMPR	WT DISTR (lb)		NEMA FRAME SIZE
	A or D	B or C
			Belt Drive
5F20	115	100	182T, 184T, 213T, 215T
5F30	140	118	184T, 213T, 215T, 254T
5F30*	168	145	184T, 213T, 215T, 254T
5F40	228	165	213T, 215T, 254T, 256T
5F60	280	210	215T, 254T, 256T, 284T
5H40	410	305	256T, 284T, 286T, 324T, 326T
5H60	515	395	286T, 324T, 326T
5H60*	630	533	324T, 326T, 364T, 365T
5H80	685	558	324T, 326T, 364T, 365T, 404T
5H120	1050	728	364T, 365T, 404T
			Direct Drive
5F40	210	145	213T, 215T, 254T, 256T
5F60	245	185	215T, 254T, 256T, 284T, 286T
5F60*	290	255	256T, 284T, 286T
5H40	380	275	256T, 284T, 286T, 324TS, 326TS
5H46	380	275	324TS, 326TS, 364TS, 365TS
5H80	480	360	286T, 324TS, 326TS, 364TS
5H60	480	360	365TS, 404TS
5H66	480	360	286T, 324TS, 326TS, 364TS, 365TS,
			404TS
5H80
	690	605	324TS, 326TS, 364TS, 365TS, 404TS
5H86	690	605	365TS, 404TS, 405TS
5H120	890	690	364TS, 365TS, 404TS, 405TS, 444TS
5H126	890	690	405TS, 444TS, 445TS

LEGEND

NEMA — National Electrical Manufacturers Association *Oversize frame.

Capacity Control — For all 5F,H compressors, a pressure-type cylinder unloader is used. On 5F20 and 5F30 compressors, the capacity control valve is external and on 5F40 through 5H126 compressors the valve is located internally. On all 5F,H compressors, capacity reduction is in response to suction pressure.

The cylinder unloading mechanism is powered by a compressor force-feed lubricating system. This feature assures unloading of all controlled cylinders at starting regardless of

1
		2
		1
5F20		5F30
1	2	1

3 2

4 3

5F40 5F60

A

— Cylinders recommended for permanently unloaded operation.

the position of the capacity control valve, since suction valves will be held in open position until the lubricating oil pressure reaches its normal operating level. Refer to Fig. 4 for cylinder unloading sequence.

An external adjusting stem is provided to set control point and maintain desired suction pressure. The control point is adjustable from 0 to 85 psig suction pressure. Differential over the complete range at any temperature level is 10.7 psig with Refrigerant 22 and Refrigerant 502. A 7-lb spring (for use on 5F40 and larger units) is furnished with the compressor which, when used, results in an adjustable control point from 0 to 50 psig with a 6.8 psig range. Insert a spring in the capacity control valve when R-12 is used. See Fig. 5.

With this arrangement, suction pressure will not drop below the control set point minus the differential within range of capacity steps since the compressor will unload to balance its capacity with evaporator load.

Power elements and valve lifting mechanisms are identical on all 5F,H compressors. However, when using capacity con- trol, various methods are used to activate the power elements.

See Table 16 for unloading steps and power requirements at each step.

5F20 AND 5F30 (Fig. 6)

Major Elements of Control Systems:

1.Capacity Control Valve: Function is to raise or lower oil pressure from oil pump in response to refrigerant suction pressure.

2.Power Elements: Function is to supply power necessary to operate valve lifting mechanism. It is modulated by the capacity control valve.

3.Valve Lifting Mechanism: Consists of a sleeve and push pin assembly around each controlled cylinder, designed to hold the suction valve open, or to permit the valve to remain in a normal operating position depending on its actuation by the power element.

2 1

2 1

		3			4	3
	5H40, 46				5H60, 66
		4	1	2	2	4
				1	1
3	3	2	2	3	3	4
	5H80, 86				5H120, 126

B

NOTE: The numerals indicate the unloading sequence and the number of cylinders that unload with each step.

SHORT-STROKE COMPRESSORS ONLY

Fig. 4 — Cylinder Unloading Sequence

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