Product Specifications
Sensor Range:
12” to 60” (adjustable)
Battery Type :
AA Duracell Alkaline – Model MN-1500
Battery Life:
3 years at 4,000 flushes per month
Flush Volume:
ZRK-C-DF-1.6
– 1.6/1.1 gallons per flush
Voltage:
6 VDC
Operating Water
Pressure:
45 psi min running; 80 psi max static.
Note: Installations with running pressure
below recommended value may void
warranty.
Automatic Flush: Flush 24 hours after the last use (switchable)
Maintenance
Override:
Magnetic flush triggering or inhibiting
switch (see page 2)
Indicator Light:
Range Adjustment (first ten minutes)
Low Battery Indication (see page 2)
Reflective surface in view for greater than 30
minutes (see page 2)
Reset Button:
To restart ten-minute rangeadjustment cycle
To enter option changes in the electronics after
repositioning switches (see page 2)
Operating
Temperature:
35°F to 104°F (2°C to 40°C)
Outside Case
and Cover:
Chrome-Plated Die Casting
Operation
1. Invisible light rays are continually emitted from the RetroFlush sensor.
2. When the user comes into range of the sensor’s detection zone (range
12 to 60 inches), the beam is reflected back to the sensor’s reciever
and converted to a low voltage electrical signal that activates an
eight-second time delaycircuit. This time delay prevents the unit from
incidental activation in the restroom. Once this circuit is completed,
the output circuit is signaled and continues in a “hold” mode for as
long as the user remains within range of the sensor. User must be in
sensor range for at least 10 seconds.
3. After the user moves away from the sensor, the absence of reflected
light starts an electrical “one-time” signal that operates the solenoid
operator (6 VDC) and activates the flushing cycle to flush the fixture.
The circuit then automatically resets for the next user.
Note: Excessive amounts of toilet paper and/or seat cover may not evac-
uate during water saving liquid flush. If paper or seat cover remains
in the bowl, the user will need to press the water saving green button
on the side of the unit to clear the bowl.
Care and Cleaning Instructions
DO NOT
use abrasive or chemical cleaners to clean flush valve as they
will dull the luster and attack the chrome or special decorative finishes.
Use only mild soap and water, then wipe dry with a clean cloth or towel.
While cleaning the bathroom tile and floor, the flush valve and electronics
should be protected from splattering of water, cleaner, acids and cleaning
fluids that can damage the sensor flush valve.
Problem
Cause
Solution
Valve will not
operate
Water supply shut off
Turn on water supply, check control stop and supply
Sensor range adjustment set too short
Increase sensor range adjustment
Expired batteries
Replace batteries
Difficulty with electronic control module
Check batteries. If problem continues, consult factory.
Solenoid problem
Replace solenoid
Red light flashes
when user is not
present
Obstruction in front of the sensor
Remove the obstruction
Sensor range set too long
Sensor is detecting opposite wall
Shorten sensor range
Red light flashes
when user comes
into view
Batteries about to expire
Replace batteries
Unit is in start-up mode
Light will stop in 10 minutes
Range adjustment reset button was
pressed.
Light will stop in 10 minutes
Valve does not shut
off
Dirt in diaphragm bypass hole
Clean bypass hole
Dirt or debris at valve seat or sealing
area
Clean valve seat and clean diaphragm kit
Riser tube filter plugged
Clean filtered riser tub
Solenoid problem
Replace solenoid
Not enough water to
fixture
Wrong RetroFlush unit installed
Check fixture requirements. Install proper RetroFlush
unit.
Control stop improperly adjusted
Adjust control stop
Diaphragm damaged
Replace diaphragm
Low running pressure
Adjust water supply to ensure 45 psi running pressure
at each valve. Move switch #1 to the off position and
press the RESET button for more water per flush.
Solenoid problem
Replace solenoid
Too much water for
fixture
Wrong RetroFlush unit installed
Check fixture requirements. Install proper RetroFlush
unit.
Control stop improperly adjusted
Adjust control stop
Dirt in diaphragm bypass hole
Clean bypass hole
Customer wishes to realize maximum
water savings
Change out yellow volume control to red volume
control included with kit.
Water drips from
chrome cap
The plastic cover has been cracked by
freezing or abuse
Replace plastic cover
The chrome cap is not tight
Tighten chrome cap
RetroFlush kit does
not fit handle port
Sloan A-29 copper ring used as handle
port gasket
Remove copper ring
TROUBLESHOOTING GUIDE
ZURN INDUSTRIES, LLC
5900 Elwin Buchanan Drive, Sanford, NC U.S.A. 27330, Ph. 1-800-997-3876, Fax 919-775-3541
In Canada:
ZURN INDUSTRIES LIMITED
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, Ph. 905-405-8272, Fax 905-405-1292
Rev. D
Date: 7/16/2018
C.N. No. SAN008311
Prod. | Dwg. No. FV486
