Lennox International Inc Merit Series Air Conditioner Torque Requirements, To Access Service Port

TABLE 3. TORQUE REQUIREMENTS

Parts	Recommended Torque
Service valve cap	8 ft.- lb.	11 NM
Sheet metal screws	16 in.- lb.	2 NM
Machine screws #10	28 in.- lb.	3 NM
Compressor bolts	90 in.- lb.	10 NM
Gauge port seal cap	8 ft.- lb.	11 NM

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 operating pressures. The gauges should be rated for use with pressures of 0 - 800 psig on the high side and a low side 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 pressure with a 4000 psig burst rating.

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.

SERVICE PORT CAP

SERVICE PORT CORE

TO INDOOR

UNIT

SERVICE PORT

CORE

TO OUTDOOR UNIT

(VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE

STEM CAP

(VALVE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE

ANGLE-TYPE SERVICE VALVE

ANGLE-TYPE SERVICE VALVE(FRONT-SEATED CLOSED) (BACK-SEATED OPENED)

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.

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 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:

TO OPEN ROTATE STEM COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM CLOCKWISE 90°.

TO INDOOR UNIT

BALL (SHOWN CLOSED)

VALVE

STEM

SWith torque wrench: Finger tighten and torque cap per table 3.

SWithout torque wrench: Finger tighten and use an appropriately sized wrench to turn an additional 1/6 turn clockwise.

Reinstall Stem Cap:

1/6 TURN

11 12 1

10 2

98 7 6 543

SERVICE PORT

SERVICE PORT

CORE

SERVICE PORT

CAP

TO OUTDOOR

UNIT

STEM CAP

Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:

					1/12 TURN
S	With Torque Wrench: Finger tighten and
	then torque cap per table 3.		11 12			1
S	Without Torque Wrench: Finger tight­	10					2
	en and use an appropriately sized	9					3
	wrench to turn an additional 1/12 turn	8	7	6		5	4
	clockwise.

NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

FIGURE 15

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