Goodman Mfg RT6100004R13 manual Servicing, Installation Requirements

SERVICING

•The distance between the condenser and evaporator in a completely horizontal installation in which the indoor and outdoor unit do not differ more than 10 feet in vertical distance from each other can approach 150 feet, as long as the equivalent length does not exceed 150 feet.

4.Two-Stage Condensing Unit: The maximum length of tubing must not exceed 75 feet here indoor coil is located above the outdoor unit.

NOTE: When the outdoor unit is located above the indoor coil, the maximum vertical rise must not exceed 25 feet. If the maximum vertical rise exceeds 25 feet, premature compressor failure will occur due to inad- equate oil return.

5.Vibration and Noise: In long line applications, refrigerant tubing is highly prone to transmit noise and vibration to the structure it is fastened to. Use adequate vibration-isolat- ing hardware when mounting line set to adjacent struc- ture.

Most refrigerant tubing kits are supplied with 3/8"-thick insulation on the vapor line. For long line installations over 50 feet, especially if the line set passes through a high ambient temperature, ½”-thick suction line insulation is recommended to reduce loss of capacity. The liquid line should be insulated if passing through an area of 120°F or greater. Do not attach the liquid line to any non-insulated portion of the suction line.

Table 9 lists multiplier values to recalculate system-cooling capacity as a function of a system’s equivalent line length (as calculated from the suction line) and the selected suction tube size. Table 10 lists the equivalent length gained from adding bends to the suction line. Properly size the suction line to minimize capacity loss.

REFRIGERANT LINE LENGTH (Ft)

Cond			0-24			25-49			50-74***
Unit					Line Diameter (In. OD)
Tons		Suct		Liq	Suct		Liq	Suct		Liq
1	1/2	5/8		1/4	3/4		3/8	3/4		3/8
	2	5/8		1/4	3/4		3/8	3/4		3/8
2	1/2	3/4		3/8	3/4*		3/8	7/8		3/8
	3	3/4		3/8	3/4**		3/8	7/8**		3/8
3	1/2	3/4		3/8	7/8**		3/8	1 1/8		3/8
	4	7/8		3/8	1 1/8		3/8	1 1/8		3/8
	5	7/8		3/8	1 1/8		3/8	1 1/8		3/8

Nominal	Vapor line		EQUIVALENT LINE LENGTH (FT)
capacity	diameter
Btuh	(in.)	50	75	100	125	150
18,000	3/4	.99	.97	.96	.95	.95
24,000	3/4	1	.99	.99	.98	.97
30,000	3/4	.98	.97	.96	.95	.94
36,000	3/4	.93	.90	.86	.83	.79
	7/8	.98	.96	.94	.92	.90
42,000	3/4	.93	.90	.87	.83	.80
	7/8	.97	.96	.94	.93	.92
	1-1/8	1	1	.99	.99	.98
48,000	3/4	.90	.86	.82	.78	N/R
	7/8	.96	.94	.93	.91	.89
	1-1/8	1	1	.99	.99	.98
60,000	7/8	.93	.91	.89	.86	.84
	1-1/8	.99	.98	.98	.97	.97

Table 10

NOTE: For a condenser with a liquid valve tube connection less than 3/8" diameter, use 3/8" liquid line tubing for a line set greater than 25 feet.

TABLE 11. LOSSES FROM SUCTION LINE ELBOWS

(EQUIVALENT LENGTH, FT.)

Type of elbow fitting		I.D. (in.)
	3/4	7/8	1-1/8
90° short radius	1.7	2	2.3
90° long radius	1.5	1.7	1.6
45°	0.7	0.8	1

Table 11

Installation Requirements

1.In a completely horizontal installation with a long line set where the evaporator is at the same altitude as (or slightly below) the condenser, the line set should be sloped towards the evaporator. This helps reduce refrigerant migration to the condenser during a system’s off-cycle.

2.For a system installation where the evaporator is above the condenser, an inverted vapor line trap should be installed on the suction line just before the inlet to the evaporator (see Fig 6). The top of the inverted loop must be slightly above the top of the evaporator coil and can be created simply by brazing two 90° long radius elbows together, if a bending tool is unavailable. Properly support and secure the inverted loop to the nearest point on the indoor unit or adjacent structure.

Table 9

*7/8" required for full ratings **1 1/8" required for full ratings

***Lines greater than 74 feet in length or vertical elevation changes more than 50 feet, refer to the long line set.

TABLE 10. CAPACITY MULTIPLIERS AS A FUNCTION OF	Fig 6. Evaporator unit with inverted vapor loop
SUCTION LINE SIZE & EQUIVALENT LENGTH

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