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 | Page 4 |
