Operating manual - SAB 120-151 A-frame (including ATEX)
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008668 en 2019.08
6.10
Cold-start system
The unit is equipped with a special "cold-start" discharge valve. This valve ensures a rapid devel-
opment of oil pressure at initial start-up in order to lubricate the compressor without requiring an
oil pump, even in cold ambient temperatures with all pressures equalised.
Warning!
Be extremely careful when dismantling the cold-start valve on the discharge side of the unit, as
condensed refrigerant often is trapped between the cold-start valve and the stop valve. A bleed
valve on the side of the check valve is used to vent the space between the check valve and the
stop valve.
Exposure to refrigerant fumes can cause injury or death.
Warning!
Inside the valve, there is a very heavy, tight spring. Provided the valve is intact, the spring
presents no danger when dismantling.
6.11
Compressor oil separation system
The oil charged to the compressor for lubrication, sealing and cooling of the compressor block is
mixed with the refrigerant gas and led to the oil separator collectively.
In the oil separator, oil and gas are separated whereupon the gas, which is almost free of oil,
leaves the compressor unit through the discharge connecting pipe, pos. A.
Two filter elements separate the oil from the gas. The main part of the oil is separated in the de-
misters and drained to the bottom of the oil separators.
The remaining oil in the gas is separated in the fine separator element, pos. 55, and returned to
the compressor through the oil return valve, pos. 52. See piping diagram.
Fig. 15: Principle for OHU 04123
del af T245755_0
A
52
53
Fine oil separator element pos. 55
Demister
Vessel
