WaterFurnace Envision Hydronic - Manual (Page 14)

14
NSKW INSTALLATION MANUAL
Hydronic Section cont.
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.
Route thermistor wires to NSKW. 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).
Adequate rate of flow is very important to system
performance and long term reliability. Follow the guidelines
for recommended flow and pipe sizing in the NSKW
recommendations table.
WaterFurnace Geothermal Storage Tank Thermostat
and Thermistor
Yellow Thermistor Wires Connected to TB (3 and 4) on
NSKW Control Board
NSKW
LOAD PUMP
HYDRONIC
LOAD
Source OUT
P/T
Ports P/T
Ports
Ball Valve
Dielectric
Unions
Dielectric
Unions
WaterFurnace
NSKW Series
NOTES:
* A 207 kPa pressure relief valve (Part No: SRV30) should be used in
hydronic applications.
** Vent valve or Pressure/Temperature port at highest point in return line prior to ball valve.
Expansion
Tank
Air
Vent
Pressure
Gauge
207 kPa
RELIEF VALVE
Air
Separator
FROM
HWG
TO
HWG
Back Flow Preventer /
Pressure Relief Valve
Source IN
GEO
STORAGE
TANK
PUMP
HOT
(Piped in
series to
an electric
water heater)
COLD
DOMESTIC
Dip Tube
Ball Valve
Vent Valve or
P/T Port**