Refrigerant System - Lennox SSB*H4 Manual

III − REFRIGERANT SYSTEM
A − Plumbing
Field refrigerant piping consists of liquid and suction lines
from the condensing unit (sweat connections) to the indoor
evaporator coil (sweat connections). Use Lennox L15
(sweat) series line sets as shown in table 3.
TABLE 3
Liquid
Unit
Line
−036, 3/8 in.
−048 (10 mm)
3/8 in.
−060
(10 mm)
The liquid line and vapor line service valves (figures 6 and 7)
and gauge ports are accessible 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 facto-
ry−installed Schrader valve. A service port cap protects the
Schrader valve from contamination and serves as the pri-
mary leak seal. Service valves are not rebuildable. If a valve
has failed, you must replace it.
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 − Using the adjustable wrench to keep the valve station-
ary, 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 turn.
Suction
L15 Line Sets
Line
L15−65
7/8 in.
15 ft. − 50 ft.
(22 mm)
(4.6 m − 15 m)
1−1/8 in. Field
(29 mm) Fabricated
To Close Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Using the adjustable wrench to keep the valve station-
ary, 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 turn.
NOTE − Stem cap must be replaced to help prevent
valve leakage.
(Valve Closed)
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 Units Only
Vapor line service valves function the same way as the other
valves, the difference is in the construction. A ball valve is
illustrated in figure 7.
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 12
Service Valve
insert hex
wrench here
to indoor coil
(valve front seated)
Service Valve
(Valve Open)
stem cap
to indoor coil
FIGURE 6
stem cap