Page 11 ZC-KI6-VSS1709
Cabinet
All cabinets have a tough, durable low
maintenance painted finish.
Cabinet dimensions are designed to
provide maximum installation flexibility.
Refer to installation requirements for
more details.
Heating coils
All heating coils are potable water grade
copper suitable for use in plumbing
systems. No lead solder is used in any
component construction. All coils and
internal piping conform to ASTM B68 or
ASTM B88 standards.
High-density aluminum fins provide
maximum heat transfer for small coil
surface.
Fan and Motor
All fans are wide body dynamically
balanced for extra quiet operation. Multi-
directional sleeve bearing motors allow
mounting in any direction for maximum
installation flexibility.
Circulating pump
The circulating pump is matched for
maximum performance. Air handlers
come with internally mounted pumps for
ease of installation. Air handlers can be
special ordered with external, field
installed pumps, when it is desirable to
locate the circulator below the air
handler, such as in attic installations.
Check Valve
Check valves serve two purposes:
• protect against back-flow of water
to avoid short circuiting around the
water heater during domestic
water use.
• protect against thermal siphoning.
Thermal siphoning is flow of water
through the space heating circuit while
the circulating pump is not operating, due
to hot water rising by natural convection.
During summer months this will cause
overheating, interfere with air
conditioning and waste energy.
All Vortex air systems come supplied
with spring-loaded check valves. The
check valve may be integral with the
pump. These check-valves have been
tested and proven to resist thermal
siphoning for installations where the air
handler elevation does not exceed the
distance above the water heater shown
in the table below.
valve size Maximum elevation
1/2”(12mm) 25 feet(8 metres)
3/4”(20mm) 50 feet(15 metres)
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