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Evaporative Condenser Make-up Water and Drain Line Installation
Make-up Water and Drain Lines
Water Supply Source
The supply line should be designed to provide a minimum supply of water within customary
domestic supply pressures, 35 to 60 psig; dynamic pressure (measured with the valve open) which
will allow approximately 30 GPM to enter the sump through the makeup water valve, when the
sump is empty. The unit uses about 2-4 GPM. Attach a hand valve at the inlet for use during
inspection and maintenance; an inlet strainer is recommended as well. Make-up water inlet
connection is a ¾" PVC slip connector. Care must be taken to ensure the water line upstream of the
water solenoid valve will not freeze. Insulating the line and utilizing heat tape is recommended if
ambient temperatures below 32° F are expected.
Water Quality
Overall performance of any water-cooled device can be affected by suspended particulates, mineral
concentration, trash and debris resulting in clogging and heat transfer loss. The evaporative-
cooled condenser is designed to greatly minimize problems with these impurities. However, float
valves and solenoid valves are used to control the incoming water. If the incoming water contains
contaminants, sand or other objects, an incoming line strainer with a 80 to 100 mesh screen is
required. The inlet line should be flushed prior to connection to the unit, whether or not there is
a strainer.
Note: Backflow preventer to be field provided and installed by others.
Water Drain Schedule 80 PVC pipe of 1¼" is normally adequate for sump water drain. Periodically,
the sump is emptied and flushed to eliminate accumulated dirt, debris, and minerals.
Concentration of these foreign substances will increase as the system operates. The evaporative
process releases essentially pure water vapor into the atmosphere, leaving the impurities behind
that accumulate in the sump. Although these impurities are present in the original make-up water,
their concentration will be higher in the sump discharge. Care and judgment should be exercised
when selecting a discharge site.
Local Site Discharge
Rooftop or simple storm sewer discharge is generally acceptable. Do not routinely direct the sump
discharge onto an area where these higher concentrations will adversely affect that area, i.e.
continued sump discharge into a flower bed for example, where the input water contains CaCO3
(lime) will eventually decrease the pH of the soil.
Sewer Discharge
The quantities of mineral and debris flushed are actually very small, and do not cause problems
when diluted in normal sewer flow. However, local, state or federal standards and restrictions must
be followed in any given locality
Make Up Water Solenoid Valve
This valve is controlled by the UCM based on water level in the sump, as well as whether a call for
mechanical cooling exists. During low ambient temperatures, the solenoid valve will be de-
energized preventing water from further filling sump. The sump drain valve opens to empty sump
of water. Operation can be extended to 10 deg by providing an optional sump heater.
Drain Valve
The drain valve is shipped to "drain during power loss conditions" . If "hold during power loss
conditions" is desired, refer to "Evaporative Condenser Drain Valve Setup" on page 98.
RT-SVX36G-EN
Installation
55
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