Advantage OACS Series, Инструкция по эксплуатации

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OACS Central Chillers : with MG Series Control Instrument
Page: 82
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
8.8 WATER QUALITY
A. Lack of as well as improper water treatment can damage to your equipment. The
equipment owner is responsible to prevent equipment damage from foreign material
or inadequate water treatment. The services of a competent water treatment specialist
should be obtained and his recommendations
followed. For small systems, a local swimming pool
supply is an excellent source of analysis service
and chemical supplies. An alternative is the addition
of 20% inhibited propylene glycol. This will inhibit
corrosion, algae growth and prevent accidental
freeze ups.
Sources For Inhibited Propylene Glycol
• Therminol FS Monsanto Chemical 1-800-459-2665
• Dowfrost Dow Chemical 1-800-447-4369
B. The following are guidelines specific to chillers with an internal circulation pump and fluid
reservoirs.
C. Long term performance of your chiller will be adversely affect by poor water conditions.
The three major problems water treatment must address are:
1. Scaling
a. Scaling of the heat transfer
surfaces due to minerals can be
minimized by proper treatment
and filtering of the make-up water.
A good quality of water must be
used.
b. The recommended purity levels
are:
Chlorides 25 ppm max
Sulfates 25 ppm max
Calcium 50 ppm max
Magnesium 50 ppm max
PH level 8 to 10
c. Although not mandatory, distilled water would be an excellent choice for
filling the system.
2. Corrosion
1. Corrosion is usually the result
of acidic water (improper PH
control). This can be controlled by
proper chemical treatment.
FREEZING POINTS FOR
WATER/PROPYLENE GLYCOL SOLUTIONS
°
F
FREEZE POINT
32
25
10
0
-10
-30
-60
0
-3.9
-12.2
-17.8
-23.3
-34.4
-51.4
°
C WATER GLYCOL*
0
10
20
30
40
50
60
100
90
80
70
60
50
40
PERCENTAGE OF
*Propylene Glycol
Note: Glycol freeze point must be 25°F below lowest setpoint.