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*The maximum system elevation is 30 ft from lowest point in the
system to highest point in the system.
A. Make Piping Sweat Connections
Check tubing set identification against Multi-Split Installa-
tion Planning Worksheet on page CL-1 to ensure correct se-
lection of service valve set on outdoor unit.
Remove plastic caps from vapor supply and vapor return serv-
ice valves. Use refrigerant grade tubing. Service valves are
closed from the factory and are ready for brazing. Pass nitro-
gen or other inert gas through piping while brazing to pre-
vent formation of copper oxide.
After wrapping the service valve with a wet cloth, the tubing
set can be brazed to the service valve using either silver bear-
ing or non-silver bearing brazing material. Consult local code
requirements. Refrigerant tubing and indoor coil are now ready
for leak testing.
NOTE: Unit is shipped from the factory with a full system
charge of R-22 (exact amount is indicated on unit name-
plate).
CAUTION: To avoid damage while brazing, service
valves should be wrapped with a heat-sinking material
such as a wet cloth.
Fig. 7 — Maximum Elevation Differential
B. Provide Safety Relief
A fusible plug is located in unit vapor return line; do not cap
this plug. If local code requires additional safety devices, in-
stall as directed.
C. Leak Test, Evacuate, and Dehydrate System
Refer to Leak Test and Evacuate and Dehydrate sections on
page 13 for details.
V. MAKE ELECTRICAL CONNECTIONS
—8—
CAUTION: When brazing tubing sets to the service
valves, a brazing shield MUST be used to prevent dam-
age to the painted unit surface.
WARNING: Unit cabinet must have an uninterrupted,
unbroken electrical ground to minimize the possibility
of personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to unit
ground lug in control compartment, or conduit ap-
proved for electrical ground when installed in accor-
dance with NEC, ANSI/NFPA 70, and local electrical
codes. Failure to follow this warning could result in the
installer being liable for personal injury of others.
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