Lennox Merit 13ACX-018-230 Installation Instructions Manual page 13

TABLE 3. TORQUE REQUIREMENTS
Parts Recommended Torque
Service valve cap 8 ft.- lb.
Sheet metal screws 16 in.- lb.
Machine screws #10 28 in.- lb.
Compressor bolts 90 in.- lb.
Gauge port seal cap 8 ft.- lb.
Using Manifold Gauge Set
When checking the system charge, only use a manifold
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.
TO INDOOR
UNIT
SERVICE PORT
CORE
TO OUTDOOR UNIT
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
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°.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT
CAP
TO 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.
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
11 NM
operating pressures. The gauges should be rated for use
2 NM
with pressures of 0 - 800 psig on the high side and a low side
3 NM
of 30" vacuum to 250 psig with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psig of
10 NM
pressure with a 4000 psig burst rating.
11 NM
SERVICE PORT CAP
SERVICE PORT CORE
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
STEM CAP
When service valve is CLOSED, the service port is open
to the line set and indoor 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
TO INDOOR UNIT
BALL (SHOWN
CLOSED)
VALVE
Reinstall Stem Cap:
STEM
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
S
S
STEM CAP
FIGURE 15
Page 13
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
follows:
S
With torque wrench: Finger tighten and
torque cap per table 3.
S
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
With Torque Wrench: Finger tighten and
then torque cap per table 3.
Without Torque Wrench: Finger tight­
en and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
1/6 TURN
11 12
1
2
10
9 3
4
8
5
7
6
1/12 TURN
11 12
1
2
10
9 3
4
8
7 5
6
13ACX SERIES