All installations and services must be performed by qualified personnel.
7
E. INSTALLATION OF TUBING LINES TO SERVICE VALVES
Please read the following instructions carefully before connecting your line set to the service valves.
**
EXTREME CAUTION SHOULD BE USED WHEN BRAZING JOINTS. KEEP TORCH
AWAY FROM CONDENSER CABINET, ALUMINUM COIL AND PLASTIC MESH WRAP.
1. Wrap a wet rag around the valve body and copper stub before
brazing. Flux the copper tube and the stub. Braze the joint, then
use a second wet rag to cool joint before removing first rag
wrapped around service valve.
When making “on the job” tubing, a solder of 95% tin, 5%
antimony or any of the silver solders such as SilFos®, Phos-
Copper®, Easy-Flo® 35 or 45, should be used. No attempt will be
made here to instruct proper soldering or brazing technique but it
is necessary for the installer to use an accepted technique in
accordance with good existing practices.
2. All joints and fittings must be properly leak tested as per EPA
guidelines after “on the job” tubing has been made up. The line
set and the evaporator coil must be evacuated to 29.96” Hg (1000
microns) or lower when all joints and fittings are leak free. The
service valves on the condenser may then be opened to release the
refrigerant to the system. Verify proper system performance. See
condensing unit manual for additional performance data.
3.
This is not a back seating valve.
Open the valve cap with an
adjustable wrench. Insert a 3/16” or 5/16” hex wrench into the
stem. Back-out counterclockwise until the valve stem just touches
the retaining ring. This opens the valve completely. The gauge
port is (open) accessible at all times.
NOTE:
Make sure all connections have been leak checked before
opening service valves.
4. Replace the valve cap “finger-tight” then tighten an
additional 1/12 turn or 1/2 hex flat. A metal-to-metal seal
is now complete.
IF THE VALVE STEM IS BACKED OUT PAST THE RETAINING RING, SYSTEM PRESSURE
COULD FORCE THE VALVE STEM OUT OF VALVE BODY AND POSSIBLY CAUSE PERSONAL
INJURY. IN THE EVENT THE RETAINING RING IS MISSING. DO NOT ATTEMPT TO OPEN
VALVE.
NOTE: MOST A/C MANUFACTURERS ADD ENOUGH REFRIGERANT CHARGE TO THE
CONDENSER FOR A 25-FOOT LINE SET. BECAUSE OF THE UNIQUE DESIGN OF THE TUBING
IN THESE UNITS, IT IS NOT POSSIBLE FOR THIS UNIT TO HOLD THAT MUCH
REFRIGERANT. THEREFORE, IT WILL BE NECESSARY FOR THE INSTALLER TO
EVACUATE AND CHARGE THE SYSTEM TO 8-12 DEGREES OF SUPERHEAT.
