Johnson Controls SABROE UniSAB III Engineering Manual page 209

Set-up
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 3.5.12 HP on two-stage.
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 3.2.3 Special limiters.
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 3.5.3 Capacity down blocked 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.
Engineering manual - UniSAB III 1.10.8
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