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FIELD WIRING DIAGRAM HP25 WITH CB19
FIGURE 6
1
2
3
THERMOSTAT HEAT ANTICIPATION SET
TING .4 AMP ELECTRIC HEAT.
WHEN TWO-STAGE THERMOSTAT IS USED,
CONNECT SECOND-STAGE HEAT BULB TO TER
MINAL W2" AND REMOVE JUMPER BETWEEN
TERMINALS R" AND W2."
WHEN OUTDOOR THERMOSTAT IS USED,
CONNECT LEADS TO TERMINALS R"
AND W2'' AND REMOVE JUMPER BE
TWEEN TERMINALS R" AND W2."
DENOTES OPTIONAL COMPONENT
T
L O Y1 E C V/R R W1 G
T
L
C
R
W1
Y1
O
4
3
K22
S23
K1
C12
4
EMERGENCY HEAT RELAY (USED ONLY
IF OUTDOOR THERMOSTAT IS USED)
FIELD PROVIDED AND INSTALLED NEAR
INDOOR UNIT. 24 VAC, 5VA MAX. NEC
CLASS 2.
CLASS II 24V FIELD INSTALLED
LINE VOLTAGE FIELD INSTALLED
DEFROST CONTROL
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 1 or field-fabricated refrigerant lines.
Refer to the piping section of the Lennox Unit Informa
tion Service Manual for proper size, type and applica
tion 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.
NOTELine 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.
-261
-211
HP25
UNIT
LIQUID
VAPOR
L10
LINE
LINE
LINE SETS
3/8 in.
(9.5 mm)
5/8 in.
L10-26
(15.9 mm) 20 ft. - 50 ft.
(6.1 m-15.2 m)
-311
-410
3/8 in.
3/4 in.
L10-41
(9.5 mm) (19.1 mm) 20 ft. - 50 ft.
(6.1 m-15.2 m)
-460
-510
3/8 in.
(9.5 mm)
7/8 in.
(22.2 mm)
L10-65
30 ft. - 50 ft.
(9.1 m - 15.2 m)
TABLE 1
REFRIGERANT LINE SET KITS
-650
3/8 in.
(9.5 mm)
1-1/8 in.
(28.6 mm)
FIELD
FABRICATED
L15
LINE SETS
L15-41
20 ft. - 50 ft.
(6.1 m-15.2 m)
L15-65
30 ft. - 50 ft.
(9 .1 m-15.2 m)
FIELD
FABRICATED
L15-26
20 ft. - 50 ft.
(6.1 m-15.2 m)
NOTE-To obtain maximum efficiency, remove the 3/4"
(19.1mm) 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"(22.2mm x
28.6mm) reducer bushing.
REFRIGERATION
Processing Procedure
The unit is factory-charged with the amount of R-22
(HCFC-22) refrigerant indicated on the unit rating
plate. This charge is based on a matching indoor coil
and outdoor coil with a 20 foot (6.1m) line set. For vary
ing lengths of line set, refer to table 2 for refrigerant
charge adjustment. A blank space is provided on the
unit rating plate to list actual field charge.
LINE SET DIAMETER
Ozs. per 5 ft. (g per 1.5m)
adjust from 20 ft.
(6.1m) line set*
Vapor
Liquid
5/8 in.
3/8 in.
3 ounce
(15.9mm)
(9.5 mm)
(88.05 g)
3 ounce
(88.05 g)
3 ounce
88.05 g)
3/8 in.
(9.5 mm)
3/8 in.
(9.5 mm)
3/4 in.
(19.1mm)
7/8 in.
(22.2mm)
TABLE 2
*If line set length is greater than 20 ft. (6.1m), add this amount. If line
set length is less than 20 ft. (6.1m), subtract this amount.
3 ounce
(88.05 g)
3/8 in.
(9.5 mm)
1-1/8 in.
(28.6mm)
Service Valves and Gauge Manifold Attachment
The liquid line and vapor line service valves and
gauge ports are accessible on the inside of the unit.
These gauge ports are used for leak testing, evacuat
ing, charging and checking charge. A separate gauge
port is provided for checking the suction pressure
when the unit is in the heating cycle.
IMPORTANT-Service valves are closed to the heat
pump unit and open to line set connections. Do not
open until refrigerant lines have been leak tested and
evacuated. All precautions should be exercised in
keeping the system free from dirt, moisture and air.
