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1. Safety Guidelines
1. Follow the installation instructions.
2. Use the appliance
• according to its intended use
• in good condition
• with due regard to safety and risk of danger.
3. Note that the appliance is exclusively for use in the
applications detailed in these installation instruc-
tions. Any other use will not be considered to
comply with requirements and would invalidate the
warranty.
4. Please take note that any assembly, commis-
sioning, servicing and adjustment work may only
be carried out by authorized persons.
5. Immediately rectify any malfunctions which may
influence safety.
2. Functional description
The DDS76 differential pressure switch actuates the
reverse rinsing operation by comparing the pressures
before and after the filter mesh. If the differential pres-
sure rises above the set value, then the automatic
reverse rinsing actuator is operated via its volt-free
contacts.
3. Application
Medium
Setting range
4. Technical data
Cable
Maximum static pressure*
Maximum static operating
pressure*
Maximum permissible
temperature of medium
Maximum permissible
ambient temperature
Microswitch hysteresis
Maximum microswitch
loading
*Trouble-free operation of the unit is only assured up to a pressure of
16.0 bar. It can withstand pressures up to 25.0 bar without damage,
but the switching function cannot then be guaranteed.
MU1H-1118GE23 R0111
Water
0.1 to 1.6 bar
(set at 1.0 bar during
manufacture)
1 meter with connector
bush
25,0 bar
16,0 bar
+ 70 °C
+ 80 °C
Ungefähr 2 %
= 24 V
U
max
I
= 0,8 A
max
P
= 19,2 W
max
GB
5. Construction
Suitable for:
• F76S fine filters
o In conjunction with the Z11S automatic reverse
rinsing actuator
• F76S-F fine filters with flanges
o In conjunction with the Z11AS automatic reverse
rinsing actuator
DDS76-1/2
DDS76-1
DDS76-11/2
6. Assembly
6.1 Installations Guidelines
• The installation site has to be frost-proof and the
protection of the device from chemicals, paints,
detergents, solvents and their vapours and environ-
mental influences must be guaranteed.
6.2 Fitting to the filter
1. Close shutoff valve on inlet
2. Release pressure on outlet side (e.g. through water
tap)
3. Close shutoff valve on outlet
4. Remove the brass plug and the pressure gauge
from the filter
5. Screw both nipples into threaded tappings on F76S
or tappings on the housing of F76S-F using the
hexagonal key supplied
6. Fit the differential pressure switch to nipple and
tighten both backnuts
o In doing this the arrows on the differential pres-
sure switch and filter housing must point in the
same direction
7. Reseal the pressure gauge into the threaded
tapping on the differential pressure switch
8. Slowly open shutoff valve on inlet
9. Slowly open shutoff valve on outlet
10. Check the seal between differential pressure
switch and filter housing
o If necessary tighten nipple or backnuts
4
F76S
for F76S-F
/
" +
/
"
—
1
3
2
4
1" + 1
/
"
DN 65/80/100
1
4
1
/
"+2"
—
1
2
Honeywell GmbH
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