Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
61/168
Technical description
Fig. 37
1. The thermosyphon oil cooler is supplied with the oil side piped to the compressor unit and stub
ends supplied on the refrigerant side.
2. A refrigerant-side safety valve is required in this location only when refrigerant isolation valves
are installed between the cooler and thermosyphon receiver. If no valves are used between the
cooler and TSOC receiver, the safety valve on the TSOC receiver must be sized to handle the vol-
ume of both vessels. Then, the safety valve on the cooler vent (liquid refrigerant side) can be
eliminated.
3. The system receiver must be below the thermosyphon receiver in this arrangement.
4.30 Water-cooled oil cooling
The plate and shell or plate-and-shell type water-cooled oil cooler is mounted on the unit com-
plete with all oil piping. The customer must supply adequate water connections. Determine the
size of the water-cooled oil cooler supplied with the unit as outlined in COMP1. The water supply
must be sufficient to meet the required flow.
Johnson Controls Denmark recommends a closed-loop system for the waterside of the oil cooler.
Careful attention to water treatment is essential to ensure adequate life of the cooler if cooling
tower water is used. It is imperative that the condition of cooling water and closed-loop
fluids are analysed regularly and as necessary and maintained at a pH of 7.4, but not
less than 6.0 for proper heat exchanger life. After initial start-up of the compressor unit, the
strainer at the inlet of the oil cooler should be cleaned several times during the first 24 hours of
operation.
System condenser
Vapour
Safety
v
alve
Static head
t
o overcome
condenser
pressure drop
Thermosyphon
r
eceiver
Liquid overflow
dr
ain to receiver
To system
e
vaporator
System
receiver
(Mounted below
thermosyphon r
eceiver level)
Liquid
le
vel
Oil temp.
c
ontrol valve
Hot
Cool
Cool
oil out
Refrigerant in
Refrigerant
Hot oil in
Plate cooler
T
SOC
6 ft.
(183 cm)
M
in.
out
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