York E3FB090, E2FB120 installation manual Line Sizing, Field Piping Diagrams

035-15410-002-B-0404

LINE SIZING

TABLE 4

1Based on Refrigerant-22 at the nominal cooling capacity of the system, a liquid temperature of 105°F and a vapor temperature of 40°F. Since refrigerant flow rates will be a little lower at the nominal heating capacity of each system, liquid line friction loss should always be based on cooling operation.

2These friction losses do not include any allowance for fittings.

3The total pressure drop of the liquid line for both friction and vertical rise must not exceed 40 PSI. If the pressure drop exceeds 40 PSI, the liquid refrigerant could flash before it reaches the expansion valve. This flashing will not only cause erratic valve operation and poor system performance, but could also damage the expansion valve.

FIG. 5 - FIELD PIPING DIAGRAMS

Oil return will be critical during:

The cooling cycle when the outdoor unit is above the indoor unit (detail 1 of Figure 5).

The heating cycle when the indoor unit is above the outdoor unit (detail 4 of Figure 5).

EXAMPLES:
#1 - 7-1/2 Ton System
125 feet of 1-3/8" OD, type “L” copper tubing
(125 feet x 1.6 psi/100 feet)	2.0 psi
Fitting*	0.4 psi
Vapor Line Pressure Drop = 2.4 psi

#2 - 10 Ton System
89 feet of 1-3/8" OD, type “L” copper tubing
(89 feet x 2.8 psi/100 feet)	.............................................2.5 psi
Fitting*	0.5 psi
	Vapor Line Pressure Drop = 3.0 psi

	#3 - 7-1/2 Ton System
	51 feet of 1-1/8" OD, type “L” copper tubing (vertical)
°	(51 feet x 4.7 psi/100 feet)	2.4 psi
	6 feet of 1-3/8" OD, type “L” copper tubing (horizontal)
	(6 feet x 1.6 psi/100 feet)	0.1 psi
	Fitting*	0.5 psi
	Vapor Line Pressure Drop = 3.0 psi

	#4 - 10 Ton System
	29 feet of 1-1/8" OD, type “L” copper tubing (vertical)
Unitary Products Group	7