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Maintenance
Water Strainer
Figure 55. In-line strainer
WATER FLOW
DIRECTION
The water strainer is factory-installed with taps for
pressure gauges on the inlet and outlet. For maximum
efficiency, a differential pressure gauge installed across
the inlet and outlet will indicate pressure loss due to
clogging and may be used as a guide to determine when
cleaning is required.
To determine if strainer requires cleaning, install pressure
gauges across inlet and outlet of strainer, and measure
pressure differential. Normally, when differential pressure
reaches 5-10 psi, the screen must be cleaned as follows:
1. Isolate the strainer by ensuring free-cooling service
shut-off valve and modulating valve 6M4 are closed.
2. Open strainer cover and remove screen.
3. Clean out strainer screen until all sediment is removed.
4. Replace screen and reinstall cover.
76
Free-Cooling Fluid Management
NOTICE:
Equipment Damage!
Failure to follow instructions below could result in
equipment damage.
DO NOT USE UNTREATED WATER. Glycol solution
must be utilized with the Direct Free Cooling option.
Glycol percentage should be based on freeze avoidance
requirements. The glycol solution requires an inhibitor
package to be carefully chosen with the aid of qualified
water treatment specialist to abate corrosion in a mixed
metal system.
The building glycol loop should not be vented to
atmosphere. A closed system is required to limit
oxidation potential within the loop.
Make-up water should be avoided.
NOTICE:
Coil Damage!
Failure to follow instructions below could result in free-
cooling coil freeze.
For units with free-cooling option, introduction of
uninhibited water into the system is not recommended,
as it could lead to internal corrosion and risk of coil
freeze. To avoid free-cooling coil damage:
•
If the building loop needs to be charged with water
for testing purposes, isolate free-cooling coils by
closing free-cooling service shut-off valve and
modulating valve 6M4.
•
Completely drain any water inadvertently introduced
into the system, and replace with glycol fluid as
required for the free-cooling system.
•
If water was introduced for hydronic testing, and was
not immediately replaced with glycol solution, a
glycol (freeze inhibitor) solution must be introduced
to the free-cooling system/coils for any long term
storage.
The direct free cooling option circuit consists of copper,
carbon steel, cast iron, zinc, EPDM rubber, brass, and
Aluminum AA3102, AA3003, AA4045 in addition to other
materials that may be in the building loop connected to the
chiller. The inhibited glycol solution should be selected at
desired concentration to insure adequate inhibitor
content. It is not advised to dilute a stronger concentrate
due to inhibitor dilution. Glycol fluid should be free from
foreign solid particles. A maintenance schedule should be
selected per the glycol manufacturer's requirements to
insure adequate protection during product usage.
RTAF-SVX001K-EN
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