WaterFurnace Envisio Series Console - Manual (Page 19)

19
ENVISION CONSOLE - 50 HZ INSTALLATION MANUAL
Always maintain water pressure in the heat exchanger by
placing water control valves at the outlet of the unit to
prevent mineral precipitation. Use a closed, bladder-type
expansion tank to minimize mineral formation due to air
exposure. Ensure proper water flow through the unit by
checking pressure drop across the heat exchanger and
comparing it to the figures in unit capacity data tables
in the specification catalog. .09-.13 l/s of flow per kW of
cooling capacity is recommended in open loop applications.
Discharge water from the unit is not contaminated in any
manner and can be disposed of in various ways, depending
on local codes, i.e. recharge well, storm sewer, drain field,
adjacent stream or pond, etc. Most local codes forbid
the use of sanitary sewer for disposal. Consult your local
building and zoning departments to assure compliance in
your area.
Open Loop Ground Water Systems
NOTE: For open loop/groundwater systems or systems
that do not contain an antifreeze solution, set SW1-Switch
#2 to the “WELL” position (Refer to the Dip Switch Field
Selection table). Slow opening/closing solenoid valves
(type VM) are recommended to eliminate water hammer.