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WSV6 VERTICAL SERIES - IOM
WSV6 Vertical Series – IOM 21
INSTALLATION CONTINUED
PIPING INSTALLATION CONTINUED

Do not allow hoses to rest against structural building
components. Compressor vibration may be transmitted
through the hoses to the structure, causing unnecessary
noise complaints.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe thread
fittings. Consult the specification sheets for sizes. Teflon
tape should be used when connecting water piping
connections to the units to insure against leaks and
possible heat exchanger fouling.
Do not over tighten the pipe connections. Flexible hoses
should be used between the unit and rigid piping to avoid
vibration transmission into the structure.
Ball valves should be installed in the supply and return lines
for unit isolation and unit water flow balancing. Pressure /
temperature ports are recommended in both the supply
and return lines for system flow balancing. Water flow can
be accurately set by measuring the water side pressure
drop of the water to refrigerant heat exchanger.

Water piping exposed to extreme low ambient
temperatures is subject to freezing and possible rupture.
Proper prevention should be taken to prevent pipe
freezing or equipment damage or failure may occur.
Failure to follow this warning could result in property
damage.

Ground loop applications require extended range
equipment and optional refrigerant/water circuit
insulation.

Geothermal Closed Loop Systems Operation of a WSV6
Water Source Heat Pump unit on a closed loop application
requires the extended range option.
ANTIFREEZE
Anti-freeze solutions must be utilized when low loop
temperatures are expected to occur. In areas where
entering loop temperatures drop below 50°F or where
piping will be routed through areas subject to freezing,
antifreeze is needed. Alcohols and glycols are commonly
used as antifreeze agents. Freeze protection should be
maintained to 15°F below the lowest expected entering
loop temperature. For example, if the lowest expected
entering loop temperature if 30°F, the leaving loop
temperature would be 22°F to 25°F. Therefore, the
freeze protection should be at 15°F (30°F-15°F=15°F).
LOW WATER TEMPERATURE CUTOUT
SELECTION
The Digital Control Module allows the field selection of low
water (or water-antifreeze solution) temperature limit by
clipping jumper JW1 and JW2, which changes the sensing
temperature associated with thermistor CO1 and CO2
respectively. Note that the CO1 thermistor is located on
the refrigerant line between the coaxial heat exchanger
and expansion device (TXV). Therefore, CO1 is sensing
refrigerant temperature, not water temperature, which is a
better indication of how water rate/temperature is
affection the refrigeration circuit. The factory setting for
CO1 is for systems using water (30°F [-1.1°C] refrigerant
temperature). In low water temperature (extended range)
applications with antifreeze (most ground loops), jumper
JW1 should be clipped to change the setting to10°F [-
12.2°C] refrigerant temperature, a more suitable
temperature when using an antifreeze solution. All units
operating with entering water temperatures below 50°F
[10°C] must include the optional water/refrigerant circuit
insulation package to prevent internal condensation.

Disconnect power BEFORE the jumper wires are clipped.
Failure to do so could result in equipment and/or property
damage.

For all applications, 50°F minimum entering water
temperature and sufficient water flow is required to
prevent freezing. Antifreeze solution is required for any
application with an entering water temperature below
50°F or, if either JW1 or JW2 cut-out limits are set to 10°F
(clipped). Failure to follow this waring could result in heat
exchanger, equipment, or property damage.