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506728−01
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
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 Ċ Pressure range of 0 − 800 pound−force per
square inch gauge (psig)
S Low side Ċ Use with 30" vacuum to 250 psig 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°.
B To close rotate stem clockwise 90°.
BALL (SHOWN CLOSED)
SERVICE PORT CORE
TO INDOOR UNIT
TO OUTDOOR UNIT
SERVICE PORT
SERVICE PORT CAP
REMOVE
STEM CAP
VALVE STEM
1
2
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.
INSERT HEX−HEAD
EXTENSION HERE
SERVICE PORT CORE
SERVICE PORT CAP
SERVICE PORT
CORE
TO OUTDOOR UNIT
STEM CAP
(VALVE STEM
SHOWN
OPEN)
INSERT HEX
WRENCH
HERE
TO INDOOR
UNIT
When service valve stem is in the CLOSED position, 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 INDOOR
UNIT
TO OUTDOOR
UNIT
REMOVE
STEM CAP
1
2
VALVE STEM
SHOWN
CLOSED
Figure 3. Operating Angle−Type Service Valve