York YMBE, YMB-HW warranty Installation, Piping Precautions, Drain Piping, Coil Connections

FORM 115.20-NOM4 (105)

INSTALLATION

PIPING

The supply and return piping must be adequately sized to meet the design water flow requirements as specified for the specific installation (see table 3 for connection sizes). All chilled water piping must be insulated to prevent condensation. It is also recommended that all piping be insulated to prevent freezing when piping is run in an unconditioned space.

Coil freeze protection is recommended for applications where the fan coil is located in ambient air locations (attics, crawl spaces, etc.) or within structures that may be unoccupied during freez- ing conditions. Consult the factory for additional information.

PIPING PRECAUTIONS

•Flush all piping prior to connection to remove all debris.

•Use wet cotton rags to cool valve bodies when soldering.

•Open all valves (midway for hand valves, manually open on motorized valves) prior to soldering.

•When soldering to bronze or brass, heat the piping while in the socket/cup and begin introducing the solder when the flux boils rapidly. Avoid direct flame into the solder joint.

•Heat can only be applied to the cup of the valve body for a min i mal time before damage occurs (even with the use of wet rags.

•Avoid rapid quenching of solder joints, as this will produce joints of inferior quality.

•Connect all piping per accepted industry standards and observe all regulations governing installation of piping systems. When all connections are complete, the system must be pressure tested. Repair any solder joint leaks and gently tighten any leaking valve packing nuts and piping accessories as required. Hydronic systems are not designed to hold pressurized air and should only be tested with water.

When connecting piping or valve kits to fan coil units, do not bend or reposition the coil header tubing for alignment purposes. This could cause a tubing fracture resulting in a water leak when water pressure is applied to the system.

DRAIN PIPING

Condensate drain lines must be installed with adequate slope away from the unit to assure positive drain age. Since the drain pan is located on the suction side of the blower, a negative pressure exists at the drain pan and a minimum trap of 1-1/2 inches must be provided in the drain line to assure proper drainage.

Drain connections, primary and secondary, are 3/4" MPT.

TABLE 3 – COIL CONNECTIONS

COOLING COIL CONNECTIONS (INCHES)

YMB, YMBE, YMB-HW

SIZES 8, 10, 12		7/8" ODS
SIZES 16, 20		1-1/8" ODS
HEATING COIL CONNECTIONS (INCHES)
	YMB-HW
SIZES 8, 10, 12, 16		7/8" ODS
SIZE 20		1-1/8" ODS

6 YORK INTERNATIONAL