Lennox Dave Signature SL28XCV Installation Instructions Manual page 20

OPERATING ANGLE-TYPE SERVICE VALVE
1 - Remove stem cap with an appropriately sized wrench.
2 - Use a service wrench with a hex-head extension (3/16" for liquid
line valve sizes and 5/16" for vapor line valve sizes) to back the
stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
NOTE - A label with specific torque requirements may be affixed to
the stem cap. If the label is present, use the specified torque.
FIGURE 14
ACCESS SERVICE PORT
A service port cap protects the service port core from contamination
and serves as the primary leak seal.
1 - Remove service port cap with an appropriately sized wrench.
2 - Connect gauge set to service port.
3 - When testing is completed, replace service port cap and tighten
as follows:
With torque wrench, finger tighten and torque
cap per table 2.
Without torque wrench, finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
Reinstall Stem Cap
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
With torque wrench, finger tighten and
then torque cap per table 2.
Without torque wrench, fi
en and use an appropriately sized
wrench to turn an additional 1/12
turn clockwise.
FIGURE 15
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
STEM CAP
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
1/6 TURN
11 12
1
10
9
8
5
7
6
1/12 TURN
11 12
1
2
10
9
4
8
5
7
6
Charging
The SL28XCV unit is factory-charged with enough HFC-
410A refrigerant to accommodate a 15-foot length of re-
frigerant piping. For refrigerant piping greater than 15
feet, calculate the additional charge using the table below.
Then add the additional refrigerant charge to the system.
Charge should be checked and adjusted using the ta-
bles provided on the charging procedure sticker on
the unit access panel. Detailed information is given in
the SL28XCV Installation and Service Procedures manu-
al, which is available on LennoxPros.com.
System charging should be performed with the unit
operating at the maximum cooling capacity (100%
capacity). The unit can be operated at maximum
capacity by entering the test mode at the S30
thermostat or using the Lennox Dealer Setup App.
The S30 Test Mode can be selected by going to
Menu> Advanced Settings> View Dealer Control
Center> Test and then select Cooling - Maximum
Rate Test. Seven-segment display on outdoor
control will show outdoor unit running capacity.
Refrigerant Charge per Line Set Length
LIQUID LINE DIA.
3/8" (9.5 MM)
*If line length is greater than 15 ft. (4.6 m), add this amount. If line
length is less than 15 ft. (4.6 m), subtract this amount.
NOTE – Insulate liquid line when it is routed through areas where
the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or
greater than 20 psig.
Alarms
Alarm information is provided on on the outdoor unit ac-
cess panel and in the iComfort S30 Thermostat Instal-
lation and Setup Guide. Detail alarm information is also
available in the SL28XCV Installation and Service Proce-
2
dures manual, which is available on LennoxPros.com..
3
4
Outdoor Control Seven-Segment Display
and Push Button
Information concerning the outdoor control seven-seg-
ment display and push button operations are available on
the unit access panel and in the SL28XCV Installation and
Service Procedures manual.
System Component Configuration
3
(Outdoor Unit)
All configuration of the outdoor unit is completed using the
iComfort S30 thermostat. Please refer to the iComfort S30
Thermostat Installation and Setup Guide for complete de-
tails on how to integrate this unit into a communicating
system.
Page 20
IMPORTANT
OUNCES PER 5 FEET (G PER 1.5 M) ADJUST
FROM 15 FEET (4.6 M) LINE SET*
3 OUNCES PER 5' (85 G PER 1.5 M)