Page 11
XC15 SERIES
EXPANSION VALVE &
O−RING (See NOTE)
Metering Device Installation
STRAINER
LIQUID LINE
STUB
DISTRIBUTOR
Figure 14
O−RING
NOTE − If necessary, remove R−22 flow control device (fixed
orifice/thermal expansion valve) from existing line set before
installing R−410A approved expansion valve and o−ring.
IMPORTANT
Failure to remove a fixed orifice when installing an
expansion valve to the indoor coil will result in im-
proper operation and damage to the system.
Manifold Gauge Set
Manifold gauge sets used with systems charged with
R−410A refrigerant must be capable of handling the higher
system operating pressures. The gauges should be rated
for use with pressures of 0 − 800 on the high side and a low
side of 30" vacuum to 250 psi with dampened speed to 500
psi. Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating.
Service Valves
The liquid line and vapor line service valves (figures 15 and
16) and gauge ports are used for leak testing, evacuating,
charging and checking charge. See table 1 (on page 1) for
torque requirements.
Each valve is equipped with a service port which has a fac-
tory−installed Schrader valve. A service port cap protects
the Schrader valve from contamination and serves as the
primary leak seal.
To Access Schrader Port:
1. Remove service port cap with an adjustable wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap.
Tighten finger tight, then tighten an additional 1/6 turn.
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight, then tighten
according to torque specifications table (page 1).
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight, then tighten
according to torque specifications table (page 1).
Front-Seated Liquid Line Service Valve
Figure 15
(Valve Shown
Closed)
Insert hex wrench
here
SCHRADER
VALVE
SERVICE
PORT
To outdoor coil
STEM
CAP
STEM
CAP
(VALVE front-
seated)
To outdoor coil
SCHRADER
VALVE
[open to line set
when valve is
closed (front
seated)]
(Valve Shown
Open)
insert hex wrench
here
To
indoor
coil
SERVICE PORT CAP
SERVICE PORT
SERVICE PORT CAP
To
indoor
coil
