SABROE HPC 100 Mk 4 LL, Руководство по эксплуатации, Страница: 29 / 50

Operating manual - HPC Mk 4 LL & Mk 5 (including ATEX)
001752 en 2023.05
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Operating instructions
3.6 UniSAB reading, safety and capacity regulating system
The UniSAB control system is described in a separate manual that will be delivered with all
units equipped with UniSAB.
3.7 Heating element
To keep the compressor lubricating oil warm during a period of standstill, a heating element is
built into the oil reservoir. Before start-up, the heating element must be switched on for 6-8
hours to ensure that only a minimum of refrigerant remains in the oil. If there is too much refrig-
erant in the oil, the oil loses its lubricating properties, and, in reciprocating compressors, there
is a great risk of the oil foaming vigorously when the compressor starts because of the falling
suction pressure.
Warning!
The heating element must not be switched on if the oil level in the reservoir is below minimum
in the sight glass. Normally, it must be turned off when the compressor is in operation.
Remember to turn off the heating element before draining the oil through the compressor serv-
ice valve and before opening the reciprocating compressor crankcase for inspection.
ATEX:
On ATEX-executions, the heating element (s) are ATEX-approved. Heating elements from
Johnson Controls Denmark have a thermostat with manual reset. If the thermostat drops out,
only competent personnel should reactivate it.
3.8 Valves for operation of compressor
Pos. no. Description
1 Suction stop valve
2 Discharge stop valve
B Oil purge/drain valve
7 Control equipment
3.9 Installation and first start-up procedure
Installation in terms of mechanical work (refrigeration system and piping), electrical work and
installation of safety equipment must be performed in accordance with local codes/rules and/or
according to EN 378-3 and EN 378-4 as minimum requirements.
The pressure loss in the downstream line from the safety valve must meet the values stated in
EN 13136 to which EN 378 is referring. The data necessary to dimension the line in
1
2
7
B