York E2FB120, E3FB090 installation manual Installation, Service Valves, Extending the Service Ports

(29 feet x 8.0 psi/100 feet)		2.3 psi
7 feet of 1-3/8" OD, type “L” copper tubing (horizontal)
(7 feet x 2.8 psi/100 feet)		0.2 psi
Fitting*	...........................................................................0.5 psi
	Vapor Line Pressure Drop =	.0 psi

*Determine the pressure drop of the fittings for each installation - DO NOT use the estimated values as shown in the above examples.

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INSTALLATION

Since the condensing units are shipped with a holding charge of Refrigerant-22, they can be checked for a refrigerant leak by depressing the stem on either of the service ports that extend through the cabinet. As soon as some internal pressure is re- lieved release the stem. DO NOT release the entire holding charge.

TABLE 5

1All horizontal vapor lines should be level since the refrigerant flows in both directions.

2All vapor lines with a vertical rise exceeding 50 feet should have an intermediate trap. Small radius traps will provide drainage points for the oil which is in the riser when the circuit is deactivated. When the circuit is reactivated, the oil will be returned to the compressor more quickly and in smaller slugs.

3Every vapor riser greater than 5 feet in height should have a small radius trap at the bottom.

4Based on Refrigerant-22 at the nominal cooling capacity of the system, a vapor temperature of 40°F and a liquid temperature of 105°F. Since refrigerant flow rates will be a little lower at the nominal heating capacity of each system, vapor line friction loss should always be based on cooling operation.

5Although vapor lines should be sized for a friction loss equivalent to a 2°F change in saturation temperature (or approximately 3 psi), sizing the lines for the proper return of oil is more important.

6These friction losses do not include any allowance for fittings. Only use a 1-1/8" riser when the indoor unit is above the outdoor unit.

SERVICE VALVES

EXTENDING THE SERVICE PORTS

1.Loosen the screws securing the service ports in shipping position. (See FIG 6).

2.Push the service ports through the corner post.

3.Tighten the screws to secure the service ports for installation.

TABLE 6

1Charges are based on 40°F suction temperature and 105°F liquid temperature.

2Type “L” copper tubing.

CAUTION: When making a braze connection, wrap a wet rag around all tubing inside the unit to prevent damage to the other components.

Dry nitrogen should always be supplied through a connection while it is being brazed or unbrazed because the temperature required to make or break a brazed joint is sufficiently high to cause oxidation of the copper unless an inert atmos- phere is provided. 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.

Make sure the refrigerant in 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 the 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" access port on the liquid line stop valve.

Connect a supply of dry nitrogen to this access port.

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

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

NOTE:

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

8 Unitary Products Group