70
TK 56701-1-IM-EN
Three Zone Installations
IIm
mp
po
orrtta
an
ntt:: Safety precautions must be followed. Refer to U
Un
niitt IIn
nsstta
alllla
attiio
on
n H
Ha
azza
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dss located in the S
Sa
affe
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y P
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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
DO
O N
NO
OT
T A
AP
PP
PL
LY
Y O
OIIL
L T
TO
O T
TH
HE
E O
OR
RS
S F
FIIT
TT
TIIN
NG
G T
TH
HR
RE
EA
AD
DS
S!!
•
Each zone needs to have a separate suction line with a check valve installed as close as possible to condensing unit.
N
No
otte
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.
Specifications for ORS Fittings
Tube
Size
Thread
Torque
O-Ring Gaskets
P/N
Liquid
3/8 in.
11/16–16
16–17 ft-lb
331015
Hot Gas
1/2 in.
13/16–16
32–35 ft-lb
330566
Suction
1–1/8 in.
1–11/16–12
93–102 ft-lb
331777
