YORK INTERNATIONAL
6
FORM 115.20-NOM4 (105)
INSTALLATION
7
YORK INTERNATIONAL
FORM 115.20-NOM4 (105)
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.
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.
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
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.
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.
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.
