Honeywell HS74CA Product specification sheet
Fully automatic combination water supply unit
Construction
The combination water supply unit comprises
• Housing with pressure gauge
• Check valve on inlet
• Test point for check valve
• Rotatable connection piece
• Spring bonnet with adjustment knob and setting scale
• Valve insert complete with diaphragm and valve seat
• Flange seal and threaded union connections
• Fine filter in clear filter bowl
• Ball valve with drain connection
• Double ring wrench
Materials
• High quality synthetic material housing
• High grade synthetic material check valve cartridge
• High quality synthetic material spring bonnet valve insert and
filter mesh carrier
• Stainless steel fine filter
• Shock-resistant, clear transparent synthetic material filter
EN0H-1131GE23 R1009 • Subject to change
bowl
• Red bronze connector piece
• Fibre-reinforced NBR diaphragm
• NBR seals
HS74CA
with automatic reverse rinsing actuator
Product specification sheet
Application
HS74CA combination water supply units integrate pressure reducing valve, reverse rinsing fine filter, non-return valve, and automatic reverse rinsing actuator in one appliance. Therefore, these
units comprise all armatures needed for private water supply
systems and ensure continuous supply of filtered water.
The fine filter stops the ingress of foreign bodies, for example rust
particles, strands of hemp and grains of sand. The check valve
protects the mains water system against back pressure, back
flow and back syphonage of health threatening liquids. The pressure reducing valve prevents over-pressure damage and reduces
water consumption. The automatic reverse rinsing actuator
operates with batteries, therefore, there is no need for a bus bar
in the area of the water supply. It is responsible for the fully automatic cleaning of the fine filter.
All individual units correspond to the requirements of current DIN/
DVGW specifications. Technical features of each unit also apply
to the combination assembly.
Special Features
• DIN/DVGW approved
• Inlet pressure balancing - fluctuating inlet pressure does not
influence outlet pressure
• Battery-operated automatic reverse rinsing actuator
• Acustic signal when battery is running low
• Patented reverse rinsing system - fast and thorough cleaning
of the filter with small amount of water
• Filtered water supplied even during reverse rinsing
• Reverse rinsing can also be activated manually
• Shock resistant clear synthetic material filter bowl enables
easy checking of filter contamination
• Filter and complete filter bowl are replaceable
• The valve insert is of high quality synthetic material and can
be fully exchanged
• Meets KTW recommendations for potable Water
Range of Application
Medium Water
Inlet pressure Maximum 16.0 bar
Outlet pressure 1.5 - 6.0 bar
The filter is constructed for drinking water installations. In case of
a process water application the filter has to be proven individually.
Technical Data
Installation position Vertical or horizontal, with filter bowl
downwards
Operating pressure Minimum 1.5 bar
Operating temperature Maximum 30 °C
Batteries* 3 LR6-1.5 V-Mignon/AA size alkali-
manganese batteries
Connection size
1) Batteries are not supplied with the appliance.
3
/4" - 11/4"
1
)
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HS74CA Fully automatic combination water supply unit
Method of Operation
The fully automatic combination water supply unit combines
pressure reducing valve, reverse rinsing fine filter, check valve,
and automatic reverse rinsing actuator in one appliance.
Water flows first through the check valve. This causes the valve
stem to push against the spring force and open the valve.
The fine filter insert comprises an upper part and a lower combination section. When in "filtering“ position, the small upper filter
is closed so that the water can only pass through the main filter
from outside to inside. Every 45 days the integrated automatic
reverse rinsing actuator opens the ball valve. While the ball valve
is opening for "reverse rinsing", the filter is pushed downwards
until the water supply to the outer side of the main filter is
stopped. Simultaneously, the water flow is opened to the upper
part of the filter. The water needed for cleaning the filter passes
through the upper sieve, the rotating impeller and the main filter
from inside to outside. By this means, the filter is fully cleaned
over its whole surface area at the full inlet pressure. The filter
automatically switches over to the operating position when the
ball valve is closed again.
The integral pressure reducing valve functions on a balanced
force principle whereby the force exerted by a diaphragm is
balanced against the force of an adjustment spring. The inlet
pressure has no influence on opening or closing of the valve. Inlet
pressure fluctuation does not therefore affect the outlet pressure.
Connection size R
3
/4"1"1
1
Weight approx. kg 3.8 4.4 4.7
Dimensions mm
H 395 395 395
h 285 285 285
T 150 150 150
t66 66 66
r27 27 31
D 105 105 105
I 90 100 105
L 189 212 234
-value 5.5 6.0 6.5
k
vs
DIN/DVGW Registration
Approval No. for FK74C
Approval No. for RV277
DW–9311 AT 2316
NW–6312 AS 2269
/4"
Options
HS74CA-...AA = Filter mesh size 95/110 µm
HS74CA-...AC = Filter mesh size 50 µm
HS74CA-...AD = Filter mesh size 200 µm
Connection size
Accessories
VST06-A Connection set
Threaded connections
VST06-B Connection set
Solder connections
VST06A
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EN0H-1131GE23 R1009 • Subject to change
VST06B
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