8. Use two wrenches to hold the fitting in the required position. Tighten the locknut to the
appropriate torque value shown in
Table 14
or
Table 15
.
9. Ensure that O-ring is not pinched and that the back-up washer seats flat on face of port.
Figure 42: Torque fitting
Callout Description
A
Torque locknut
Assembling straight non-adjustable end fittings
1. Inspect to ensure that both matching parts are free of burrs, nicks, scratches, or any foreign
particles.
2. If the O-ring is not pre-installed, install the O-ring on the port end of fitting. Use care not to
nick the O-ring.
3. Lubricate the O-ring with a light coat of synthetic POE oil or POE grease.
4. Screw the fitting into the port until the hex flat contacts the port face. Light wrenching may
be necessary.
5. Tighten to give torque for the required size as specified in
Table 14
or
Table 15
.
Figure 43: SAE or ISO 6149 straight thread O-ring
Callout Description
A
Sealed with an O-ring
B
Threaded for holding power
YVAM Air-Cooled Centrifugal Liquid Chiller
44
