Honeywell NK300s Instrucciones De Instalación

NK300s Boiler Feed
Combination
APPLICATION
The Honeywell 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 - 4.0bar)
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: 1/4" 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 (0.14bar).
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
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