INSTALLATION INSTRUCTIONS
R
−
410A Split System Air Conditioner
421 01 5103 00
9
I. OPENING SERVICE VALVES
Outdoor units are shipped with a refrigerant charge
sealed in the unit. Opening the service valves releases
this charge into the system.
NOTE:
Open the Suction service valve first. If the Liquid
service valve is opened first, oil from the compressor
may be drawn into the indoor coil TXV, restricting
refrigerant flow and affecting operation of the system.
Remove Suction service valve cap and insert a hex
wrench into the valve stem. Hold the valve body steady
with an end
−
wrench and back out the stem by turning the
hex wrench counterclockwise. Turn the stem until it just
contacts the rolled lip of the valve body.
After the refrigerant charge has bled into the system,
open the Liquid service valve.
NOTE:
These are not back
−
seating valves. It is not
necessary to force the stem tightly against the rolled lip.
The service valve cap is a primary seal for the valve and
must be properly tightened to prevent leaks. Make sure
cap is clean and apply refrigerant oil to threads and
sealing surface on inside of cap.
Tighten cap finger tight and then tighten additional
6
of a
turn (1 wrench flat) to properly seat the sealing surfaces.
J. GAUGE PORTS
Check for leaks at the schrader ports and tighten valve
cores if necessary. Install plastic caps finger tight.
