Table 10: Chiller hardware torque values
Torque value
Location
Description
P/N
SAP
Quantity
ft·lb
N•m
Suction line flange at
compressor
M24 X 3 / 90 mm long 021-33185-090
731065
12
230
312
Discharge line flange at
compressor
M20 X 2.5 / 70 mm
long
021-33184-070
731064
8
150
204
Liquid line shutoff valve inlet
flange
M16 X 2 / 60 mm long 021-35816-060
5399748
4
55
75
Liquid line shutoff valve outlet
flange
5/8 UNC 3.75 in. long 021-32310-030
555972
4
65
89
Liquid line Variable orifice
butterfly valve flanges
5/8 UNC Stud 5.5 in.
long
021-12760-000
729652
8
45
61
Compressor mounting feet at
compressor
M20 X 2.5 / 60 mm
long
021-33184-060
731063
4
441
598
Compressor mounting feet at
unit base
3/8 UNC / 1.5 in. long 021-19305-024
564228
8
43
59
Refrigerant tubing reassembly
The following are procedures to be used to reassemble the chiller refrigerant piping.
Assembly of straight thread O-ring port fittings
The male and female ends of SAE and ISO 6149 straight thread O-ring ports have UN/UNF or metric
straight threads. An elastomeric O-ring is fitted to the male end. During assembly, the O-ring is
firmly sandwiched between the angular sealing surface of the female port and the shoulder of the
male end. As a result, sealing is affected and maintained by the O-ring compression, which results
from the clamping force generated by tightening. The straight threads do
not
offer sealing action,
but they provide the resistance (holding power) for service pressure.
Figure 18: Adjustable end fitting
Adjustable end assembly
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 O-ring on port end of fitting. Take care
not
to nick the
O-ring.
3. Lubricate the O-ring with a light coat of synthetic Polyolester (POE) oil or POE grease.
4. Back off the locknut as far as possible. Make sure that the back-up washer is
not
loose and
is pushed up as far as possible. This ensures that the O-ring is completely at the back of the
land so that it remains in the land area when the fitting is turned out at Step 6.
YVAM Air-Cooled Centrifugal Liquid Chiller
30
