Page 19
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO OPEN, ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE, ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CAP
STEM CAP
VALVE
STEM
1 -Remove stem cap with an appropriately sized wrench.
2 -Use an appropriately sized wrench to open. To open valve, rotate
stem counterclockwise 90°. To close, rotate stem clockwise 90°.
OPERATING BALL-TYPE SERVICE VALVE
FIGURE 15
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
SERVICE PORT CORE
SERVICE PORT CAP
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
STEM CAP
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
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.
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
NOTE - A label with specific torque requirements may be affixed to
the stem cap. If the label is present, use the specified torque.
OPERATING ANGLE-TYPE SERVICE VALVE
FIGURE 16
1
2
3
4
5
7
8
9
10
11
12
1/12 TURN
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.
1
2
3
4
5
6
7
8
9
10
11
12
1/6 TURN
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 17
Checking Refrigerant Charge
The EL18XCV 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 charge specied for the specic
indoor coil match-up listed on the unit charging sticker.
When charging the system with refrigerant or checking
refrigerant, the “Charge Mode” (CHRG MODE) jumper
provides the ability operate the unit at 100% capacity. See
Charge Mode Jumper section on page 17 for details.
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 EL18XCV Installation and Service Procedures manu-
al, which is available on LennoxPros.com.
Refrigerant Charge per Line Set Length
LIQUID LINE DIA.
OUNCES PER 5 FEET (G PER 1.5 M) ADJUST
FROM 15 FEET (4.6 M) LINE SET*
3/8" (9.5 MM) 3 OUNCES PER 5' (85 G PER 1.5 M)
*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.
High Pressure Switch (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed pres-
sure switch opens when liquid line pressure rises above
the factory setting of 590 + 15 psig and automatically re-
sets at 418 + 15 psig.
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