WaterFurnace Envision Hydronic (NSW) - Manual (Page 9)

9
NSW INSTALLATION MANUAL
NOTES:
1) Unions and valves must be installed so that acid flushing
of the heat exchanger is possible.
2) Route thermistor wires to NSW. Remove yellow
thermistor wires on TB 3 and 4 from control box and
connect thermistor wires from geothermal storage tank.
Set the pump sampling (PS) in the set up of the control
board to continuously (C) sampling (reference Note 5 in
the Wiring Schematic).
Hot Water Generator Connections
The heat reclaiming hot water generator coil is vented double-
wall copper construction and is suitable for potable water. To
maximize the benefits of the hot water generator a minimum
50-gallon water heater is recommended. For higher demand
applications, use an 80-gallon water heater as shown below or
two 50-gallon water heaters connected in a series. A geo storage
tank should not be used in this application unless it is plumbed
in a series with an electric water heater. The geo storage tank
is equipped with a single 4500 Watt element and will not be
able to provide adequate water heating if used as a standalone
water heater. Electric water heaters are recommended. Make
sure all local electrical and plumbing codes are met for installing
a hot water generator. The Envision NSW is not supplied with
an internal circulator. A DPK5 kit will need to be purchased to
connect to the hot water generator. The DPK5 kit is supplied with
installation instructions, circulator, tank adaptor and temperature
limit switch. Be sure to burp (vent) the pump. Open the screw
2 turns only in the end of the pump motor (if Grundfos ® pumps
are used) to allow trapped air to be discharged and to ensure the
motor housing has been flooded.
Potable Water Systems cont.
Alternate Hot Water Installation with
Direct Coupling to a Double Wall Unit
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NOTES:
1) Unions and valves must be installed so that acid flushing
of the heat exchanger is possible.
2) Make sure there is not a check valve in the diptube of
the tank.
3) Route thermistor wires to NSW. Remove yellow
thermistor wires on TB 3 and 4 from control box and
connect thermistor wires from geothermal storage tank.
Set the pump sampling (PS) in the set up of the control
board to continuously (C) sampling (reference Note 5 in
the Wiring Schematic).