Lennox 12HPB Series User Manual

Page 10
A − Plumbing
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections). Use Lennox
L10 (flare) or L15 (sweat) series line sets as shown in
table 4.
TABLE 4
Outdoor
Unit
Line Set
Model No.
(L10 or
Length of
Lines
Liquid Line
Outside Dia.
Vapor Line
Outside Dia.
Unit
Model No.
(L10 or
L15)
ft. m in. mm in. mm
L10-41-20
L15-41-20
20 6
12HPB24
L10-41-30
L15-41-30
30 9
3/8
95
3/4
19
12HPB24
12HPB30
L10-41-40
L15-41-40
40 12
3/8 9.5 3/4 19
L10-41-50
L15-41-50
50 15
L10-65-30
L15-65-30
30 9
12HPB36
12HPB42
12HPB48
L10-65-40
L15-65-40
40 12
3/8 9.5 7/8 22.2
12HPB48
L10-65-50
L15-65-50
50 15
12HPB60 *Notavailable 3/8 9.5 1-1/8 28.5
*Field fabricate.
B − Service Valves
The liquid and vapor line service valves (figures 14 and 15)
and gauge ports are accessible from outside the unit.
Each 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 Vapor Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension (5/16 for
vapor line and 3/16 for liquid line), back the stem out
counterclockwise until the valve stem just touches the re-
taining ring.
3 − Replace stem cap and tighten finger tight, then tighten an
additional 1/6 turn.
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.
DANGER
To Close Liquid or Vapor Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension (5/16 for
vapor line and 3/16 for liquid line), turn stem clockwise to
seat the valve. Tighten firmly.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
FIGURE 14
LIQUID LINE SERVICE VALVE (VALVE OPEN)
SCHRADER
VALVE
SERVICE
PORT
SERVICE
PORT
CAP
INSERT HEX
WRENCH HERE
INLET
(TO INDOOR COIL)
OUTLET
(TO COMPRESSOR)
STEM CAP
SCHRADER VALVE OPEN
TO LINE SET WHEN VALVE IS
CLOSED (FRONT SEATED)
SERVICE
PORT
SERVICE
PORT
CAP
RETAINING RING
STEM CAP
OUTLET (TO
COMPRESSOR)
INSERT HEX
WRENCH HERE
LIQUID LINE SERVICE VALVE (VALVE CLOSED)
VALVE FRONT
SEATED
INLET
(TO INDOOR COIL)

Lennox 12HPB Series Specifications

General

Brand	Lennox
Model	12HPB Series
Category	Heat Pump
Language	English