resideo NK300S Instrucciones De Instalación

Braukmann
NK300S Boiler Feed Combination
APPLICATION
The Resideo Braukmann NK300S Boiler Feed
Combination serves as a boiler fill valve used in closed
loop heating systems. The NK300S is a (re)filling
combination valve that contains an integrated pressure
reducing valve, strainer, double check backflow
preventer with air vent (to protect potable water supply
against back flow of heating water into supply pipe), two
shut-off ball valves, pressure gauge, and conveniently
located test ports for easy inspections and check out.
SPECIFICATIONS
Model: NK300S Boiler Feed Combination
Model Numbers:
NK300S-100 (includes sweat and threaded
connections)
NK300S-100UP (includes union press fitting
connections)
Medium: Water
Regulator Mechanism:
Fiber-reinforced EPDM diaphragm
Filter Mechanism: Stainless steel fine filter mesh
Inlet Pressure (Maximum): 150 psi (10.3 bar)
Inlet Pressure (Min): 30 psi (2.0 bar)
Outlet Pressure Range:
10 psi - 58 psi (0.7 bar - 4.0 bar)
Outlet Pressure: Factory set at 15 psi (1 bar)
Pressure setting tolerance: ± 4 psi.
Differential: 14.5 psi minimum (inlet to outlet)
Fluid Temperature (Maximum):
180 °F (82 °C) according ASSE 1081
Ambient Temperature Range:
33 °F to 140 °F (1 °C to 60 °C).
Pressure Gauge: 0-60 psi @ max temp 140°F (60°C)
Connection size: 1/2" NPT, Sweat, or Union Press
Connection size discharge: 1/2" NPT
INSTALLATION INSTRUCTIONS
Connection size test ports: 1/4" NPT
Installation position:
Horizontal pipework with discharge connection directed
downwards
Max. flow rate:
16 gpm (60 l/min) @ 22 psi (1.5 bar) pressure fall-off
Approvals:
ASSE 1081 Listed
Function of the backflow preventer
The backflow preventer is a safety device in accordance
with ASSE 1081 to protect the quality of potable water
against back pressure, back flow and back syphonage of
non-potable water from plants and connected
equipment.
The backflow preventer is separated in three chambers
(inlet, middle, and outlet chamber).
If no water is drawn from the downstream system, the
backflow preventer is in normal position. The up- and
downstream check valves and the discharge valve are
closed.
If water is drawn from the downstream system, the
backflow preventer is in flow position. The check valves
up- and downstream are opened and the discharge
valve is closed.
The backflow preventer changes to shut-off position
(back pressure) if the differential pressure between
middle- and inlet chamber falls under 2 psi (0.14 bar).
The check valves are closed and the discharge valve is
opened.
Function of the pressure reducing
valve
The pressure reducing valve reduces the inlet pressure
to the desired set-pressure on the outlet side.
The pressure reducing valve works according to the
force comparison principle. The force of a diaphragm
operates against the spring force of the regulating valve.
If the outlet pressure and therefore diaphragm force fall
because water is drawn, then the greater force of the
spring causes the valve to open. The outlet pressure
then increases until the forces between the diaphragm
and the spring are equal again.
33-00339EFS-05