7
/34
rev 09.2017 - ©STULZ S.p.A. - all rights reserved
CONTROL AND SAFETY DEVICES
-
Safety pressure switch:
It stops the compressor operation when the internal pressure of the circuit
exceeds the calibration level - (High pressure switch)
-
Safety valve (when installed): It vents the internal pressure of the circuit to the atmosphere if there
would be an abnormal increase in pressure with the equipment in operation or switched off
NOTE FOR WATER CONDENSED CHILLERS
For chillers WRW, WLW AND ORW with a water condenser in the heat exchanger, follow the following
instructions:
Condensation condenser temperature water entering to the exchanger operation limits. Min/Max 10-30°C.
Recommended filtering level
μm 500.
The minimum capacity is suggested in the technical chart attached to the machine and varies to vary the
required chiller capacity or for any special client requests, which are occasionally analyzed by the technical
office.
The adjustment of the water pressure valve on the water side is done when it is inspected in the plant. For
any problems/questions, contact aftersales.
A short discussion about the heat exchangers used to condense the water chiller:
Load loss
The load loss values that are found in the heat exchangers can be estimated at a minimum of 0.1 bar and a
maximum of 0.5 bar.
Dirtiness and Corrosion
To increase the efficiency of the exchangers, reduce, or avoid, build-ups due to materials in the liquids, for
example, mud, sand, etc, which often occurs in exchangers powered by rainwater, cooling towers, river
water, lake water, etc. They are not suited for salt water.
Dirtying due to carbonate would seem to be different since, as is known, they cannot be influenced by the
operation of the exchanger's temperature: precipitation starts when the water that is contained therein
exceeds the threshold of 45°C.
The heat exchangers are clean with suitable fluids for this purpose. Problems of corrosion are limited given
the specific resistance of the materials used for construction.
Summary of Contents for OR Series
Page 1: ...EN rev 09 2017...