York E1FB180, E1FB240 installation manual Liquid Lines, Refrigerant Line Charge

035-16192-001-A-1001

TABLE 5 - LIQUID LINES

		Nominal	Refrigerant	Type L	Pressure Drop3
						Vertical
Model Designation		Capacity	Flow Rate1	Copper Tubing	Friction2
		(Tons)	(Lbs./Min.)	(Inches O.D.)	(PSI/100 Ft.)	Rise
						(PSI/Ft.)
180	System 1	7-1/2	22.5	5/8	3.5	0.5
	System 2
240	System 1	10	30.0	5/8	5.8	0.5
	System 2

1Based on Refrigerant-22 at the nominal capacity of the condensing unit, a liquid temperature of 105°F and a suction temperature of 40°F.

2These friction losses do not include any allowances for a strainer, filter-drier, solenoid valve, isolation valve or 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

TABLE 6 - REFRIGERANT LINE CHARGE

Refrigerant	Line Size,	Refrigerant1 Charge
Line2	OD (In.)	(Lb/Ft)
Liquid	5/8	0.113
Vapor	1-1/8	0.013
	1-3/8

1Charges are based on 40°F suction temperature and 105°F liquid temperature. 2Type “L” copper tubing.

Use these line charges to adjust the system operating charge when the refrigerant lines are more or less than the 25 feet listed in Table 2.

Turn the stem in (or clockwise)3. between 1/4 and 1/2 turn to open the access port.

As soon as some internal pressure is relieved, close the ac-

cess port. DO NOT remove the entire holding charge.

NOTE: The copper disc on the liquid connection will prevent any internal pressure from being relieved through the main port of the liquid line stop valve.

If the unit has already lost its holding charge, it should be leak tested and the necessary repairs should be made. If the unit has maintained its holding charge, you can assume that it has no leaks and proceed with the installation.

CAUTION: Dry nitrogen should always be supplied through a connection while it is being brazed or unbrazed be- cause the temperature required to make or break a brazed joint is sufficiently high to cause oxidation of the copper unless an inert atmosphere is pro- vided. The flow of nitrogen should be continued until the joint has cooled.

WARNING The dry nitrogen must always be supplied through a pressure regulating valve.

Before installing the liquid line between the outdoor and in- door units, remove the copper disc from the liquid connection on the outdoor unit per the following procedure:

Make sure the refrigerant 1in. the line has been recovered and that the liquid service valve on the unit is front-seated and closed. The valve stem should be turned to its maxi- mum clockwise position.

Drill a small hole through the2.disc before unbrazing it to per- mit a flow of dry nitrogen through the connection while it is being unbrazed.

WARNING: This hole is also required to prevent the internal pressure from building up as the disc is being un- brazed and from blowing the disc off.

This warning applies to any disc being removed from a service valve, coil connection, etc.

Remove the cap from the 1/4"3. access port on the liquid line stop valve.

Connect a supply of dry nitrogen4. to this access port.

Unbraze the copper disc from5. the liquid connection while maintaining a minimum flow of dry nitrogen through the connection.

After the disc has been removed,

Burnish the external surfaces1. of the liquid connection on the outdoor unit and the end of the field-supplied piping be- ing used for the liquid line.

NOTE: Clean surfaces are essential for a well brazed connec- tion.

2.Carefully clean the internal surfaces of the above. Any par- ticles left on these surfaces may lead to a future system malfunction.

NOTE: Use only copper tubing that has been especially cleaned and dehydrated for refrigerant use. If the tub- ing has been open for an extended period of time, it should be cleaned before being used.

The liquid line connections can now be brazed while maintain- ing a minimum flow of dry nitrogen through the piping.

NOTE: A filter-drier is factory-mounted in the outdoor unit for the heating cycle and in the indoor unit for the cooling cycle.

Do NOT install another filter-drier in the field-supplied liquid line because refrigerant will flow in both direc- tions on a heat pump system.

Recover the holding charge of the indoor unit and then remove the sealing caps or discs from both its liquid and vapor connec- tions per the following procedure:

1.Make sure the refrigerant in the lines has been recovered, then drill a small hole through both the liquid disc and the vapor disc. If the holding charge has already been lost, the coil should be leak-tested and the necessary repairs should be made.

2.Move the dry nitrogen supply from the access port on the liquid line service valve of the outdoor unit to the hole through the vapor disc on the indoor unit.

3.Unbraze the coil's liquid line disc while maintaining a flow of dry nitrogen across the connection and through the hole in the liquid line disc.

8 Unitary Products Group