Lennox XP14 SERIES Unit Information page 14

A − Plumbing
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections). Use Lennox
L15 (sweat) series line sets as shown in table 4.
TABLE 4
Refrigerant Line Sets
Field
Connections
Mod-
Liquid Vapor
el
Line Line
−018
3/8 in. 3/4 in
−024
(10 mm) (19 mm)
−030
−036
3/8 in. 7/8 in
−042
(10 mm) (22 mm)
−048
3/8 in. 1−1/8 in.
−060
(10 mm) (29 mm)
B − Service Valves
Service valves (figures 18 and 19) and gauge ports are ac-
cessible from the outside of the unit. Use the service ports
for leak testing, evacuating, charging and checking charge.
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 complete, replace service port cap. Tight-
en finger tight, then an additional 1/6 turn.
To Open Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to
back the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 to 1/8 turn.
To Close Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to turn
the stem clockwise to seat the valve. Tighten the stem
firmly.
NOTE − Use a 3/16" hex head extension for 3/8" line
sizes or a 5/16" extension for large line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 to 1/8 turn.
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
L15−41
3/8 in. 3/4 in
15 ft. − 50 ft.
(10 mm) (19 mm)
(4.6 m − 15 m)
L15−65
3/8 in. 7/8 in
15 ft. − 50 ft.
(10 mm) (22 mm)
(4.6 m − 15 m)
3/8 in. 1−1/8 in. Field
(10 mm) (29 mm) Fabricated
service
port
to outdoor coil
service
port cap
Schrader valve open
to line set when valve is
closed (front seated)
insert hex
wrench here
service
port
to outdoor coil
service port
cap
Schrader
valve
Vapor Line Ball Valve – 5 Ton Only
Vapor line service valves function the same way as the oth-
er valves, the difference is in the construction. If a valve has
failed, you must replace it. A ball valve is illustrated in figure
19.
The ball valve is equipped with a service port with a factory−
installed Schrader valve. A service port cap protects the
Schrader valve from contamination and assures a leak−free
seal.
Page 14
Service Valve
(Valve Closed)
insert hex
wrench here
to indoor coil
(valve front seated)
Service Valve
(Valve Open)
to indoor coil
FIGURE 18
stem cap
stem cap