Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
209/346
5: Common evap/cond
N/N
N/Y
Y/N
Y/Y
This point can be configured to the four values, meaning:
N/N - separate evaporator and condenser for each compressor.
N/Y - separate evaporator for each compressor, but common condenser.
Y/N - common evaporator, but separate condenser for each compressor.
Y/Y - common evaporator and condenser for each plant (i.e. compressors with same Multisab system
no.)
On plants with a common evaporator the suction pressure limiter cannot start the next compressor in
the sequence. This is only possible if a separate evaporator has been configured. On plants with a com-
mon condenser the discharge limiter cannot start the next compressor in the sequence. This is only pos-
sible on plants with separate condensers.
6: HP on two stage
No
Yes
Usually choose
No
. In special cases on two-stage plants
Yes
can be selected for HP compressors. The
compressors can thus be forced to start by means of the input
External starting permission
.
Note:
The compressor does not stop before the starting permission has been removed even though
there is no cooling requirement.
See detailed description in subsection
.
7: High limit
0 to 100%
High limit
is used to insert the capacity limit between 0 and 100% for the
high suction pressure
limiter.
See
High suction pressure limitation
in subsection
.
8: Capacity output
No
Yes
Select
Yes
if you want to make the UniSAB III capacity (Yield) signal available as an analogue output on
channel AO1. The signal will be a 4-20mA output signal corresponding to the compressor capacity
(Yield) signal between 0% and 100%
Select
No
if you are not using this function.
Note that this function cannot be used or configured if
Oil system, 3: Oil Cooling
is configured to HLI 4-
20 mA or if
Oil system, 7: Oil flow control
is configured to Yes.
9: Cap down blocked
No
Yes
Select
Yes
to use the
Cap down blocked
. See subsection
for more
information.
Note that the
Cap down blocked
function and the chiller function
Flow condenser
both use the same dig-
ital input, DI11. See subsection
3.6.7 Flow condenser (ChillPAC/PAC - optional).
Always select
No
if you do not wish to use the
Cap down blocked
function.
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