Danfoss OUB Data sheet
Data Sheet
Oil seperator
Type OUB
Oil seperator type OUB is for use
in all refrigeration plants
Oil separator type OUB is for use in all
refrigeration plants where the compressor
lubricating oil must be returned directly to the
compressor oil sump under all operating
conditions.
In this way lubricating oil from the compressor
is prevented from circulating with the
refrigerant in the refrigeration system itself.
Features
• Ensures oil return to compressor oil sump.
Prevents compressor breakdown caused by
lack of lubrication. Increases compressor
operating life
• High eciency Due to the interaction of
reduced ow velocity, change of ow
direction for oil concentration, collection of
separated oil at high temperatures, and
automatic oil return to the crankcase
• Protects against liquid hammer in the
compressor
• Better utilisation of condenser and
evaporator capacity (no oil-gas collection)
• Pulsation and noise damping on the highpressure side of system
• OUB 1 may be used in the following EX range:
Category 3 (Zone 2)
AI213886423775en-000801
123
781012131517
Float
Oil container
Float needle
Orice
Return oil connection (
1
⁄4 in. / 6 mm are /
solder)
Connection nipple
Inlet connection refrigerant vapour
Outlet connection refrigerant vapour
Oil concentrator
Fixing strap
Oil seperator, Type OUB
Functions
Figure 1: OUB 1/OUB 4
The very eective function of the OUB is due to the interaction of the following:
• velocity and change of ow direction of the incoming mixture of oil and refrigerant
• oil concentration, separation, and ltration
• storage of separated oil at high temperatures, thus preventing absorption of the refrigerant.
Refrigerant vapour is led through the inlet connection (12). The oil contained in the vapour is separated as a result
of the change in velocity and direction through the oil concentrator (15) which at the same time also acts as an oil
lter.
When the superheated refrigerant vapour ows around the oil container (2) some of the superheat is given o. In
this way the oil container reaches a constant high temperature and the separated oil is stored in a warm state, i.e.
with as low a refrigerant content as possible. Thus, the refrigerant is prevented from owing to the crankcase
where it could cause violent boiling.
The oat (1) opens the needle valve (3) depending on the amount of oil, whereupon the condensing pressure
forces the oil back to the crankcase therefore ensuring automatic oil return.
© Danfoss | Climate Solutions | 2021.02 AI213886423775en-000801 | 2
B2B1
D1
H
H 1
H 2
H 3 H 4
L3
Danfoss
40B100.10
OUT
OIL
IN IN
OUT
OUB 1 and 4 (solder connector)
OUB 1 and 4 (flare connector)
B
1 B
2
B3
D
B1
B
2
B3
Features
Specications
Refrigerants
R22, R134a, R290 **), R404A, R407A, R407C, R407F, R407H, R438A, R448A, R449A,
R449B, R450A, R452A, R454A *), R454C *), R455A *), R507A, R513A, R600 **),
R600a **), R1234ze *), R1270 **)
(1)
- OUB 1 only
(2)
- OUB 1s only
Max. working pressure
PS/MWP = 28 bar
Max. test pressure
Pe = 40 bar
Temperature of medium
-40 – 120 °C
Net volume
OUB 1: 0.52 l
OUB 4: 2.46 l
Oil reservoir
OUB 1: 0.1 l
OUB 4: 0.5 l
Recommended tightening torque of unions
OUB 1: 40 Nm
OUB 4: 90 Nm
Oil seperator, Type OUB
Product specication
Technical data
Table 1: For type OUB
(1)
(1)
OUB 1 is evaluated for R454A, R454C, R455A, R1234ze by ignition source assessment in accordance with standard EN ISO80079-36. Flare
OUB 1 is evaluated for R454A, R454C, R455A, R1234ze by ignition source assessment in accordance with standard EN ISO80079-36. Flare
connections are only approved for A1 and A2L refrigerants.
connections are only approved for A1 and A2L refrigerants.
(2)
(2)
OUB 1s is evaluated for R290, R454A, R454C, R455A, R600, R600a, R1234ze, R1270 by ignition source assessment in accordance with standard
OUB 1s is evaluated for R290, R454A, R454C, R455A, R600, R600a, R1234ze, R1270 by ignition source assessment in accordance with standard
EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants
EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants
For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers,
where refrigerants are listed as part of technical data.
Dimensions and weight
Figure 2: OUB 1/OUB 4 - without connection unions
Figure 3: OUB 1/OUB 4 (are & solder connection)
© Danfoss | Climate Solutions | 2021.02 AI213886423775en-000801 | 3
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