3DJH
PLUMBING
Field refrigerant piping consists of liquid and vapor
lines from the heat pump (sweat connections) to the
indoor evaporator coil (typically flare connections).
Use Lennox L10 series line sets as shown in table 1 or
use field--fabricated refrigerant lines. Refer to unit in-
formation manual piping section for proper size, type
and application of field--fabricated lines.
If refrigerant tubes are routed through a wall, seal and
isolate the opening so vibration is not transmitted to
the building.
NOTE-Line length should be no greater than 50 feet
(15.2 m). Select line set diameters from table 1 to en-
sure oil return to compressor.
UNIT
LIQUID
LINE
VAPOR
LINE
L10
LINE SETS
HP23--311
HP23--411/413
HP23--461/463
HP23--511/513
3/8 in.
(10mm)
3/4 in.
(19mm)
7/8 in.
(22mm)
HP23--211
HP23--261
5/16 in.
(8mm)
5/8 in.
(16mm)
L10--21
20 ft. -- 50 ft.
(3m -- 15.2m)
TABLE 1
REFRIGERANT LINE SET KITS
1/4 in.
(6mm)
HP23--141
1/2 in.
(12mm)
Field Fabricated
L10--41
20 ft. -- 50 ft.
(6.1m -- 15.2m)
3/8 in.
(10mm)
L10--65
30 ft. -- 50 ft.
(9.1m -- 15.2m)
HP23--651/653
1--1/8 in.
(29mm)
3/8 in.
(10mm)
Field Fabricated
NOTE-To obtain maximum efficiency, remove the
3/4 reduction from the L10-65 series line sets and the
flare fitting from the indoor coil. Then, make a sweat
connection using a 7/8 X 1-1/8 reducer bushing.
Sweat Connection Procedure
1-- End of refrigerant line must be cut square, free
from nicks or dents, deburred. Pipe must remain
round, do not pinch end of line. (I.D. and O.D.)
2-- The thermometer well (packaged separately and at-
tached to the liquid line) should be installed in the
liquid line close to the HP23 unit as shown in figure
5. Connect thermometer well male end to female
end of liquid valve. Take care to install thermometer
well so that the thermometer can be inserted and
read easily. Wrap a wet cloth around the liquid line
valve body and copper tube stub to protect from
heat damage during brazing. Wrap another wet
cloth underneath the liquid valve to protect the base
paint.
FIGURE 5
THERMOMETER WELL
(Field Installed)
PROTECT LIQUID LINE
VALVE WITH WET RAG
DURING BRAZING
THERMOMETER WELL
INSTALL THERMOMETER WELL SO THAT THERMOMETER
CAN BE INSERTED AND READ EASILY
LIQUID
LINE
VALVE
THERMOMETER WELL--MALE
LIQUID LINE--FEMALE
CONNECTION
3-- Quench the joint with water or a wet cloth to pre-
vent possible heat damage to valve core and open-
ing port.
REFRIGERANT METERING DEVICE
+3 XQLWV DUH DSSOLFDEOH WR HLWKHU 5)& RU DQ H[SDQVLRQ
YDOYH V\VWHP 6HH LQGRRU FRLO LQVWDOODWLRQ LQVWUXFWLRQV DQG
WKH /HQQR[ HQJLQHHULQJ KDQGERRN IRU DSSURYHG 5)&
DQG 7;9 PDWFK XSV DQG DSSOLFDWLRQ LQIRUPDWLRQ
RFC Systems
+3 XQLWV DUH VKLSSHG ZLWK HLWKHU DQ 5)& PHWHULQJ GH
YLFH 5)& EXOOHW LV LQVWDOOHG DV VKRZQ LQ ILJXUH 7DNH
FDUH QRW WR WZLVW FDS WXEHV ZKHQ ORRVHQLQJ VHDO QXW IURP
RULILFH ERG\ ,Q FDVHV RI QRQ WUDGLWLRQDO DSSOLFDWLRQV
5)& EXOOHW VKLSSHG PD\ QRW EH DSSURSULDWH 5HIHU WR WKH
LQGRRU FRLO LQVWDOODWLRQ LQVWUXFWLRQV DQG WKH HQJLQHHU
LQJ KDQGERRN IRU VSHFLILF RULILFH LQIRUPDWLRQ
RFC INSTALLATION
DISTRIBUTOR
BULLET
ORIFICE
ORIFICE
BODY
SEAL
NUT
FIGURE 6
SWEAT
CONNECTION
