Service Valves - Lennox Merit Series 14HPX Installation Instructions Manual

OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.

SERVICE VALVES

VARIOUS TYPES
OPEN TO BOTH INDOOR AND
SERVICE PORT CAP
SERVICE PORT
CORE
TO INDOOR
UNIT
TO OUTDOOR UNIT
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.
To 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 fol-
lows:
S
With Torque Wrench: Finger tighten and torque cap per Table 1.
S
Without Torque Wrench: Finger tighten and use an appropriately
sized wrench to turn an additional 1/6 turn clockwise.
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.
Operating Ball Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close rotate stem clockwise 90°.
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:
S
With Torque Wrench: Finger tighten and then torque cap per Table 1.
S
Without Torque Wrench: Finger tighten and use an appropriately sized wrench to turn
an additional 1/12 turn clockwise.
NOTE A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
506377−01 11/09
OUTDOOR UNITS
SERVICE PORT
(VALVE STEM
SHOWN OPEN)
INSERT HEX
WRENCH HERE
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
Figure 1. Angle and Ball Service Valves
Each valve is equipped with a service port which has a
factory−installed valve stem. Figure 1 provides information
on how to access and operating both angle and ball service
valves.
SERVICE PORT CAP
SERVICE PORT
CORE
VALVE STEM
FRONT-SEATED
TO INDOOR
UNIT
TO OUTDOOR
UNIT
STEM CAP
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
1/6 TURN
11 12
1
2
10
9 3
4
8
5
7
6
Page 4
SERVICE PORT
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
STEM CAP
CLOSED TO BOTH
INDOOR AND OUTDOOR
ANGLE−TYPE
UNITS
SERVICE VALVE
(FRONT−SEATED
TO INDOOR UNIT
CLOSED)
BALL (SHOWN CLOSED)
STEM CAP
BALL−TYPE SERVICE
VALVE
1/6 TURN
11 12
1
2
10
9 3
4
8
7 5
6
VALVE STEM