Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
245/346
Set-up
45. Flow condenser
For chiller use only.
After the float switch has become low, this timer delays the shutdown No condenser flow.
46. Oil return evaporator
For chiller use only.
After the level float switch has become low, this timer delays the closing of the oil return valve draining
the evaporator.
47. Oil return delay
For chiller use only.
At compressor start-up, this timer is used to delay the open/close function of the oil return valve draining
the oil separator.
48. Pump down
For chiller use only.
This timer controls the maximum time the pump down sequence can run after compressor stop. Pump
down is used when the Chiller DX expansion valve control is configured.
This pump down function, where the compressor runs with a closed expansion valve, lets the compres-
sor run until the suction pressure is below the ”pump down set point” or until the pump down timer has
run out, whichever comes first.
49. PMS delay
After compressor stop it is possible to delay the PMS Start request output signal within the stated time.
This delay can e.g. be used for pump after-run.
50. Critical low oil circuit
For SAB 157 HR compressors
This timer starts if the difference in pressure between oil pressure and discharge pressure exceeds 5.0
bar. A shutdown is issued if the timer runs out. See subsection 2.2.35 Critical oil circuit pressure shut-
down for more details about this shutdown.
51. Start rpm limiter
For SAB 157 HR compressors
During start-up the speed for a SAB 157 HR may be limited to 1,000 [rpm] if the internal suction pressure
is too high. The start-up limiter will only be active at compressor start-up and it can maximum be active
for the time set in timer Start RPM limiter.
If the start-up limiter is still active when the Start RPM limiter timer runs out, a shutdown is given and the
compressor is stopped.
52. High internal pressure
For SAB 157 HR compressors
This timer starts if the calculated internal pressure exceeds 100.0 bar. A shutdown is issued if the timer
runs out. See subsection 2.1.2 Measured and calculated pressure levels - screws, Note 29.
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