Installation
RT-SVX24J-EN
67
Evaporative-Cooled 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 is field installed and should
only be installed by qualified personnel .
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.
Figure 45. Space pressure and duct supply pressure tubing schematic
