TIAGO

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HVAC
59
10.3.12. DO’s & DONT’s
DO’S
 Keep suction discharge hose assembly and liquid
line capped until right before assembly of joint.
 Ensure that protective sleeves are in proper loca-
tion where specified
 Lubricate all pre-installed O-rings with specified
refrigerant mineral oil (Reference assembly in-
structions) prior to assembly of joints. Pre-
lubricated, preinstalled O-rings do not require lu-
brication prior to installation unless the oil has
absorbed into the O-ring and the surface is dry.
 Seat O-ring in its female cavity prior to hand start-
ing and torquing joint nuts.
 Seat male end form with O-ring in its female cavi-
ty prior to torquing the mini block-fitting joint.
 Use two wrenches for making each refrigerant
joint connection - a calibrated torque wrench on
the nut and a backup wrench on the mating nut or
a block fitting wrench on the block.
 Clip or secure hoses and lines as specified.
 Be sure caps are tight on access valves. To in-
sure tightness, screw caps down until cap seal
contacts valve housing and then give it ¼ to ½
turn more.
 Assemble dual O-ring fitting joints as follows:
a) Oil bore with a specified oiling tool using mineral
oil.
b) Do not oil O-rings.
c) Align end forms and then push together com-
pletely
d) Tighten joint to specified torque using a backup
wrench.
 Rotate stock on a first-in first-out basis.
 Finger start all mounting bolts that thread into
compressor or brackets. Also finger start the bolt
securing the block fitting on the suction discharge
hose assembly to the compressor.
 DO: Oil O-rings with mineral oil prior to assem-
bling a refrigerant joint. Pre-oiled O-rings do not
require oiling unless the oil has been absorbed in-
to the O-ring and the surface is dry.
 DO: Use specified mineral oil to lubricate O-rings
(Reference assembly instructions )
 DO: Use correct refrigerant O-rings in the vehicle
refrigerant system . (Refer to assembly instruc-
tions for part numbers).
DON’TS
 Make connections with bends, kinks, or obstruc-
tions in lines.
 Use bolt or nut to “walk” manifold block or mini
block into it’s mating part. Proper technique is
with O-ring in seat, push blocks together trapping
seal washer before running up and tightening the
fastener.
 Allow hoses and lines to rub against adjacent
parts.
 Bend metal lines to ease assembly. Do not use
lines as a handle to lift the compressor or con-
denser.
 Use lines contaminated with water.
 Allow hoses and lines to directly contact sheet
metal or touch hot engine components.
 Use bent twisted, kinked or damaged hoses and
lines.
 Combine refrigerant joint assembly operations
with “dirty” operations such as gritty brackets, oily
suspension components, etc.
 Process “broken” operations where one operator
loosely assembles a joint and a subsequent op-
erator tightens the joint to required torque.
 Use PAG oil to lubricate O-rings.
 Lubricate seal washers prior to attaching refriger-
ant lines to components.
 Use PAG lubricant to lubricate O-rings.