EN/10.2021/i04 © STULZ S.p.A. – all rights reserved
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
12.3.
Device for low ambient temperature up to -10°C
Installation of a differential pressure switch for the control of the modulation condenser fan. It’s
installed as standard in models with pre/-1K, WLAxxxxx3xxxxx.
The kit allows the expansion of chiller working ambient temperature limit from +2,5°C until -10°C
ambient temperature (with water added with proper amount of glycol).
12.4.
Temperature tracking with differential thermostat
Installation of an external probe, electrically connected to the electronic control of the chiller.
It allows the chase of the temperature read by the external probe, imposing a minimum and
maximum temperature limit. When these limits will be reached, the chiller will not change the
temperature until the joining of the temperature chase range.
Standard parameters on the electronic control related to temperature chase:
parameter
Standard value
Description
Adjustment range
CMt
0
Checking mode: Absolute (0) / T° External (1)
0 ÷ 1
LFi
25
Lower operation limit
-40
°C
÷ LFs
LFs
45
Upper operation limit
LFi ÷ +40
°C
12.5. Tank electric level with pump stop function
Installation of an electric level switch in the tank with intervention at 1/3 of tank capacity.
The intervention of the electric level act as safety device, interrupting the working of the pump and
of the pre-heating resistance in the tank, to avoid damages of the chillers.
An alarm appears on chiller display. Tank filling automatically reset the level switch.
12.6. 50/60 Hz medium pressure pump
Pump installation with higher pressure. For the performances, see the graphs in paragraph “6.3.
Technical data””
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