Lenox 50677201 Caps and Fasteners Torque Requirements, Operating Gauge Set and Service Valves

Models: 50677201 Elite Series XP14 Units HEAT PUMPS

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Caps and Fasteners Torque Requirements

When servicing or repairing HVAC equipment and components, ensure the fasteners are appropriately tightened. Table 1 list torque values for various caps and fasteners.

Table 1. 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

 

 

 

Operating Gauge Set and Service Valves

IMPORTANT

To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted

BTo close rotate stem clockwise 90°.

TO INDOOR UNIT

BALL (SHOWN CLOSED)

2 VALVE STEM

SERVICE PORT

SERVICE PORT CORE

SERVICE PORT CAP

TO OUTDOOR UNIT

REMOVE

 

1 STEM CAP

Figure 2. Operating Ball−Type Service Valve

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 open the service valve.

snugly over the cap before tightening.

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold gauge set that features low−loss anti−blow back fittings.

Manifold gauge set used for HFC−410A refrigerant systems must be capable of handling the higher system operating pressures. The manifold gauges should be rated for:

S High side

square inch gauge (psig)

SERVICE PORT CAP

SERVICE PORT CORE

SERVICE PORT

CORE

TO INDOOR

UNIT

TO OUTDOOR UNIT

(VALVE STEM SHOWN OPEN)

INSERT HEX WRENCH HERE

STEM CAP

S

Low side sig with

 

dampened speed to 500 psig

S

Manifold gauge set hoses must be rated for use to 800

 

psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for refrigerant recovery, flushing, leak testing, evacuating, weighing in refrigerant and optimizing system charge.

Each valve is equipped with a service port which has a factory−installed valve core. Figure 3 provides information on how to access and operate both angle− and ball−type service valves.

BALL−TYPE SERVICE VALVE

1.Remove stem cap with an appropriately sized wrench.

2.Use an appropriately sized wrenched to open or close valve.

A To open rotate stem counterclockwise 90°.

When service valve is OPEN, the service port is open to line set, indoor and outdoor unit.

INSERT HEX−HEAD

2 EXTENSION HERE

TO INDOOR

UNIT

TO OUTDOOR

 

UNIT

VALVE STEM

 

 

SHOWN

 

CLOSED

1REMOVE STEM CAP

When service valve stem is in the CLOSED position, the service port is open to the line set and indoor unit.

Figure 3. Operating Angle−Type Service Valve

506728−01

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Lenox 50677201 installation instructions Caps and Fasteners Torque Requirements, Operating Gauge Set and Service Valves