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R R e e f f r r i i g g e e r r a a t t i i o o n n T T u u b b i i n n g g C C o o n n n n e e c c t t i i o o n n s s
Three Zone Installations
I I m m p p o o r r t t a a n n t t : : Safety precautions must be followed. Refer to U U n n i i t t I I n n s s t t a a l l l l a a t t i i o o n n H H a a z z a a r r d d s s located in the S S a a f f e e t t y y P P r r e e c c a a u u t t i i o o n n s s
section of this manual before proceeding.
Connections at Condensing Unit
Refer to the illustrations on the following pages.
The following installation standards must be followed:
•
Thermo King requires the use of bulk rolled refrigeration tubing and tube benders to reduce fittings and solder
joints where applicable . It is also required that the use of nitrogen or another inert gas be used to purge the tubes
before soldering. This prevents oxidation and formation of scale inside tubes.
•
Clean all tubes and fittings prior to installation and soldering.
•
Discard O-rings that come with the condensing unit. Oil and install new O-rings supplied in kit.
•
Clean all threads on ORS fittings prior to installation.
•
Apply refrigerant oil to the O-rings only. D D O O N N O O T T A A P P P P L L Y Y O O I I L L T T O O T T H H E E O O R R S S F F I I T T T T I I N N G G T T H H R R E E A A D D S S ! !
•
Each zone needs to have a separate suction line with a check valve installed as close as possible to condensing unit.
N N o o t t e e : : Remove internal components of valves before soldering and use 35% silver solder.
•
When tightening ORS tubing connections, always use a backup wrench to hold the backside of the ORS fitting to
prevent the refrigeration tube from twisting.
•
Torque ORS fittings on the condenser as shown in the table below.
•
Insulation should be added to all segments of suction and hot gas tubes.
•
Secure all tubing every 609.6 mm (24.00 in.) with provided clamps.
Tube
Liquid
Hot Gas
Suction
70
Specifications for ORS Fittings
Size
3/8 in.
11/16–16
1/2 in.
13/16–16
1–1/8 in.
1–11/16–12
Thread
Torque
16–17 ft-lb
32–35 ft-lb
93–102 ft-lb
O-Ring Gaskets
P/N
331015
330566
331777
TK 56701-1-IM-EN
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