Refrigerant System - Lennox 13ACC Series Manual

II − REFRIGERANT SYSTEM
A − Plumbing
Field refrigerant piping consists of liquid and suction lines
from the condensing unit (sweat connections) to the indoor
evaporator coil (flare or sweat connections). Use Lennox
L15 (sweat) series line sets as shown in table 1.
TABLE 1
Line Set
Length of
Condensing
Model No.
Lines
Unit Unit
(L10 or (L10 or
Model No.
ft.
L15)
L15 41 20 20
L15 41 30 30
13ACC024
13ACC030 13ACC030
L15 41 40 40
L15 41 50 50
L15 65 30 30
13ACC036 13ACC036
13ACC037
L15 65 40 40
13ACC042 13ACC042
13ACC048
L15 65 50 50
13ACC047
*Not available
13ACC060
*Field fabricate.
The liquid and suction line service valves (figures 9 and 10)
and gauge ports are accessible from outside the unit.
The valve is equipped with a service port. The service ports
are used for leak testing, evacuating, charging and checking
charge. A schrader valve is factory installed. A service port cap
is supplied to protect the schrader valve from contamination
and serve as the primary leak seal.
NOTE Always keep valve stem caps clean.
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 an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and 5/16" hex head extension
back the stem out counterclockwise until the valve stem
just touches the retaining ring.
3 − Replace stem cap and tighten finger tight, then tighten
an additional 1/6 turn.
Liquid Line Suction Line
Outside Dia. Outside Dia.
m in. mm in. mm
6
9
3/8 3/8 9 5 9.5 3/4 3/4 19 19
12
15
9
12
3/8 9.5 7/8 22.2
15
3/8 9.5 1 1/8 28.5
Do not attempt to backseat this valve. Attempts to
backseat this valve will cause snap ring to explode
from valve body under pressure of refrigerant.
Personal injury and unit damage will result.
To Close Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and 5/16" hex head extension, turn
stem clockwise to seat the valve. Tighten firmly.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
LIQUID LINE SERVICE VALVE (VALVE OPEN)
INSERT HEX
WRENCH HERE
SERVICE
PORT
OUTLET
(TO COMPRESSOR)
SERVICE
PORT
CAP
SCHRADER
VALVE
LIQUID LINE SERVICE VALVE (VALVE CLOSED)
SERVICE
PORT
OUTLET
(TO COMPRESSOR)
SERVICE
PORT CAP
SCHRADER VALVE OPEN
TO LINE SET WHEN VALVE IS
CLOSED (FRONT SEATED)
Page 6
DANGER
STEM CAP
INLET
(TO INDOOR COIL)
RETAINING RING
STEM CAP
INSERT HEX
WRENCH HERE
INLET
(TO INDOOR COIL)
(VALVE FRONT
SEATED)
FIGURE 9