ATS DWS-8C User manual

U.V. Disinfection
INSTALLATION & OPERATION MANUAL
This manual covers installation, operation and maintenance requirements
for the WQA Tested and Certified Model:
DWS-8C Class A U.V. Disinfection Unit
It is important that those responsible for the installation of this
equipment, as well as the owner / operator, read this manual
and carefully follow the instructions and guidelines.
Installation of this system must comply with all applicable state and local regulations.
Revised: 12/08
DWS C Series
AQUA TREATMENT SERVICE, INC.
194 HEMPT ROAD
MECHANICSBURG, PA 17050
ph: [phone]
fax: [phone]
This Class A system conforms to NSF Standards 55 for the disinfection of microbiologically contaminated water
that meets all other public health standards. This system is not intended for treatment of water that has an
obvious contamination source, such as raw sewage; nor is this system intended to convert wastewater to
microbiologically safe drinking water. This system is intended to be installed on visually clear water. If this
system is used for treatment of untreated surface waters or ground waters under the direct influence of surface
waters, a device found to be in compliance for cyst reduction under the appropriate NSF/ANSI Standard shall be
installed upstream of this system.
NSF/ANSI Standard 55 Class A System
System Tested and Certified by Water Quality Association against
NSF/ANSI Standard 55 for disinfection performance, Class A

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Perfomance Data Sheet
Model Number...............................DWS-8C Class A
Rated Service Flow ...........................8 gallons / minute
Maximum Working Pressure ....................100 psi
Maximum Operating Temperature................110ºF
UV Monitor-
The UV Monitor has built-in alarms to warn of inefficient performance or UV lamp failure. When the UV intensity
measured by the UV Monitor and Sensor falls below the preset alarm condition (70%) to notify the user that the UV
Lamp requires replacement. The alarm will sound and the LED display will flash.
For general installation, operation and maintenance instructions and use limitations please see the Installation and
Operation Manual for the DWS-8C Class A System.
For applications-
This Class A system conforms to NSF/ANSI 55 for the disinfection of microbiologically contaminated water that meets
all other public health standards. The system is not intended to convert wastewater or raw sewage to drinking water.
The system is intended to be installed on visually clear water.
NSF/ANSI 55 defines wastewater to include human and/or animal body waste, toilet paper, and any other material
intended to be deposited in a receptacle designed to receive urine and/or feces (blackwaste); and other waste materials
deposited in plumbing fixtures (greywaste).
If this system is used for the treatment of untreated surface waters or ground water under the direct influence of
surface water, a device found to be in conformance for cyst reduction under the appropriate NSF/ANSI Standard shall
be installed upstream of the system.
Electrical Characteristics ..............................................................................120V/60 Hz 0.6 amps
Recommended Service Life of UV Lamps ..................................................9,000 hours
Maximum Operating Feed Water Temperature ............................................110ºF
Model Number of Replacement Components ..............................................ATS8-246 UV Lamp
Minimum Working Pressure .........................................................................25 psi
Minimum Operating Temperature ................................................................35ºF
Electrical Requirements................................................................................120V/60Hz 0.6 amps
Recommended Replacement Intervals of UV Lamps ..................................9,000 hours

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SAFETY INSTRUCTIONS
WARNING - to guard against injury, basic safety precautions should be observed, including the
following:
1. READ AND FOLLOW ALL SAFETY INSTRUCTIONS.
2. DANGER -To avoid possible electric shock, special care should be taken since water is present
near electrical equipment. Unless a situation is encountered that is explicitly addressed by the
provided maintenance and troubleshooting sections, do not attempt repairs yourself, refer to an
authorized service facility.
3. Carefully examine the disinfection system after installation. It should not be plugged in if there is
water on parts not intended to be wet.
4. Do not operate the disinfection system if it has a damaged power cord or plug, if it is
malfunctioning or if it is dropped or damaged in any manner.
5. Always disconnect water flow and unplug the disinfection system before perform cleaning or
maintenance activities. Never yank the power cord to remove it from an outlet, grasp the
plug and pull to disconnect.
6. Do not use this disinfection system for other than the intended use (potable water applications). The
use of attachments not approved, recommended or sold by the manufacturer / distributor may cause
an unsafe condition.
7. Intended for indoor use. Do not install this disinfection system where it will be exposed to the
weather. Do not store this disinfection system where it will be exposed to temperature below
freezing unless all the water has been drained from it and the water supply has been disconnected.
8. Read and observe all the important notices and warnings on the water disinfection system.
9. If an extension cord is necessary, a cord with a proper rating should be used. A cord rated for less
Amperes or Watts than the disinfection system rating may over heat. Care should be taken to
arrange the cord so that it will not be tripped over or accidentally pulled from the outlet.
10. SAVE THESE INSTRUCTIONS.
WARNING: The light given off by this unit can cause serious burns to unprotected eyes and skin. Never
look directly at a lit U.V. lamp. When performing any work on the U.V. Disinfection System, always
unplug the unit first. Never operate the U.V. system while the lamp is outside of the U.V. chamber.
WARNING: The U.V. lamp inside of the disinfection system is rated at an effective life of approximately
9,000 hours. To ensure continuous water treatment, replace the U.V. lamp
annually with the appropriate Aqua Treatment Services U.V. lamp. Failure to comply may
present a fire hazard.
WARNING: For Class A Systems, boil water in a failure situation.

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FUNCTION:
This Class A system conforms to NSF/ANSI 55 for the disinfection of microbiologically contaminated
water that meets all other public health standards. The system is not intended to convert wastewater or
raw sewage to drinking water. The system is intended to be installed on visually clear water. NSF/ANSI
55 defines wastewater to include human and/or animal body waste, toilet paper, and any other material
intended to be deposited in a receptacle designed to receive urine and/or feces (blackwaste); and other
waste materials deposited in plumbing fixtures (greywaste). The DWS-8C model has been tested by an
independent 3rd party test organization for compliance with NSF 55 Class A microorganism log
reduction requirements and to insure a UV dose applied of 40,000uws/cm2 (40mJ/cm2) at the maximum
rated flow per the Model Flow Chart listed below. Please contact your water treatment professional with
questions regarding DWS-8C applications.
Model# Max Gpm # Lamps KW@120V AMP@120V AMP@220V Pipe Size Dimensions Shipping Weight
DWS-8C 8 1 0.07 0.6 0.3 1’’ Mnpt 36’’ X 10’’ X 7’’ 45 Lbs.
MAXIMUM CONCENTRATION LEVELS BEFORE ULTRAVIOLET:
Turbidity.................................5NTU Hardness..........................................7 gpg
Color.......................................None Iron...................................................0.3 ppm
Manganese........................0.05 ppm pH....................................................6.5 - 9.5ppm
Important Note - Pre-filtration equipment may be required if these parameters cannot be maintained. Flow
rate must not exceed rated capacity of the unit.
DESCRIPTION OF EQUIPMENT:
The DWS C Series are of unique design with an ultraviolet germicidal lamp housed within a
single quartz sleeve surrounded by a stainless steel pressure chamber. The chamber is fabricated out of
304 Stainless Steel. A removable stainless steel cover exposes electrical components for servicing,
when required.
The DWS C Series comes with an ultraviolet lamp designed with one pin at each end. This type of lamp
has a socket connected to each pin.
A stainless steel threaded nipple with a brass compression nut and O-Ring is located at each end of the
disinfection chamber.
The quartz sleeve is intended to be placed through the disinfection chamber and will slightly protrude from
each threaded nipple end. The ultraviolet lamp is placed within this quartz sleeve. The U.V. light shines
through this specially designed hard quartz sleeve for maximum disinfection efficiency to meet the
requirements for bacteria reduction in potable water.
The inlet/outlet are located on one side of the chamber and may be interchanged as to designation
dependent upon installation. A sight port is provided for safe and easy view of operation.

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GENERAL CONSIDERATIONS FOR ALL DISINFECTION UNITS:
1. When installing the equipment, it is necessary that the unit be isolated from vibration,
heavy equipment, and poorly connected piping.
2. Incoming water temperature to the unit should not exceed 35°minimum to 110°
maximum degrees Fahrenheit. The Operating temperature should also be between 35
minimum to 110 maximum degrees Fahrenheit.
3. The operating pressure should be between 25 and 100 psi.
4. Before putting the unit into final operation follow sanitation procedures as outlined in this
manual for proper disinfection. Sanitizing all discharge piping and fittings with household
bleach from disinfection unit to point of use removes existing contaminants and gives
the unit a “clean start.” Be sure to rinse with U.V. treated water.
5. A proper flow control must be used to insure only the designated flow through the unit.
GENERAL PRECAUTIONS TO BE FOLLOWED AT ALL TIMES:
1. Always disconnect electrical power to any U.V. unit before servicing.
2. Under no circumstances should personnel look at a U.V. lamp in operation
3. U.V. disinfection units must always be properly grounded.
INSTALLATION:
The DWS C Series are always placed after the pressure tank and any other type of treatment devices
(i.e. softeners, filters).
These units are normally installed in a vertical position in an enclosed area with good ventilation.
Allow clearance of at least the unit’s length at one end for quartz sleeve and bulb replacement. Four
(4) anchor bolt holes are provided for proper wall support. Use wall plugs with screws for sufficient
support (not included).
If your piping system is subject to impulse pressure resulting in a “water hammer” condition, a surge
tank or other means must be provided to remove this condition; otherwise, this extreme shock
pressure condition may rupture or fracture the quartz sleeve.
Make all plumbing connections to allow for ease of service. System and Installation shall comply
with applicable state and local regulations.
**All C Series UV Units must be mounted vertical.**

Step By Step Installation:
1. Turn off the water before cutting into the water line.
2. Assess the installation (i.e. type of pipe, size of lines, etc.) and obtain necessary plumbing
fittings for installation. Inlets and outlets on the DWS-5C are ¾'' MNPT. Inlets and outlets
__on the DWS-8C, 15C are 1'' MNPT. Inlets and outlets on the DWS-30C are 1½'' FNPT.
Inlets and outlets on the DWS-50C are 2½'' FNPT. Use Teflon tape on all threaded connec-
tions and avoid over tightening.
Note: The flow control is a press in type. Each unit has a 3/4" MNPT inlet/outlet machined so
the press in flow control can be easily inserted into whichever port you select for the
inlet. Make sure the rubber part of the flow control is facing outward from the port
selected. Simply hand press or slightly tap in the flow control until it seats on the
inside ledge of the machined port.
3. Using the mounting bracket provided, secure unit to wall, or other surface. Make sure to
allow enough room to install, replace, and clean the quartz sleeve and bulb. Installing a
water shut-off valve before and after the unit is recommended to make servicing easy.
4. After mounting, install quartz sleeve, O-Ring, and bulb per instructions. Turn on the water
slowly, check for leaks, and repair as needed prior to full service operation.
5. After the unit is full of water, plug it into a grounded 115V outlet. Observe operation
through the safety sight port. The lamp will show a bright blue glow. If any problems
are noted, consult trouble shooting guide.
GENERAL INSTALLATION DIAGRAM
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QUARTZ SLEEVE:
Note: Before start up, flush unit for 3 minutes with running water. After flush-
ing, follow sanitation procedures.
Installation of the Quartz Sleeve:
Always handle quartz sleeves carefully to prevent breaking or chipping. The quartz sleeves are to be
clean and free of fingerprints before installing.
Remove the compression nuts. Install the quartz sleeve through the stainless steel threaded nipples
allowing an equal amount to extend beyond each nipple. Install the O-Ring down to the top of the
nipple. Avoid riding the O-Ring on any threaded part of the nipple. Hand-tighten each compression
nut to form a compression seal around the quartz sleeve. Avoid overtightening the nuts, which may
cause a fracture on the end of the quartz sleeve. Under normal operation conditions, hand-tightening
will provide a 100 psi seal. Do not use any devices to tighten end nuts.
After you have tightened the compression nuts and all other plumbing connections, open the outlet
valve. Slowly open the inlet valve and flush out all remaining air. Then close the outlet valve and
slowly open the inlet valve fully. Check the unit for leaks. If you find a leak at the compression nut,
tighten the nut further. If the leak continues, drain the unit and inspect the quartz O-Ring and quartz
sleeve for proper seal. Once you complete checking the unit, reassemble O-Ring and tighten gland nut.
Repressurize the unit and check again.
REQUIREMENTS FOR CLEANING THE QUARTZ SLEEVE:
As water passes through the U.V., minerals, debris and other matter in the water may deposit onto the
quartz sleeve. After sufficient film has formed on the quartz sleeve, the ability of the ultraviolet
germicidal rays to pass though the quartz sleeve and into the water may be impaired. Therefore, it is
necessary to determine a cleaning schedule for the quartz sleeve. The frequency will depend on the
specific type of water conditions. If the water has been processed through softeners and/or filters; clean-
ing may be required only once per year. If untreated water is used, the cleaning frequency will vary. A
minimum of once yearly is the standard recommendation for cleaning and lamp replacement. Contact
your local dealer for scheduling this service. Your specific situation will vary the frequency time
according to the water quality of the home or facility application.
QUARTZ SLEEVE CLEANING PROCEDURES:
To clean the quartz sleeve, turn off the water flow to the disinfection unit, and disconnect the electrical
service. Carefully remove the U.V. lamp. Loosen the compression nuts with O-Rings and remove the
quartz sleeve while draining the water from the chamber. The quartz sleeve may then be washed with
a mild soap and hot water solution and rinsed clean with hot water. Should this be insufficient to clean

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the quartz sleeve, a mild acid may be used (i.e. vinegar). Be certain to follow all recommended safety
and handling procedures on the acid container. It is important to
handle the quartz sleeve with care to prevent breakage. Make certain that all finger prints are wiped
clean before reinstalling (see installation of the quartz sleeve). Replace O-Rings [ATS8-544(2)] every
time a quartz sleeve is cleaned or replaced.
U.V. LAMPS:
INSTALLATION OF THE ULTRAVIOLET LAMPS:
CAUTION: Never look directly at an operating U.V. lamp and never operate a U.V. lamp outside the
disinfection chamber.**DO NOT PUT POWER ON AT THIS TIME!**
Make sure unit is unplugged when installing or servicing ultraviolet lamp. Remove any paper tabs on
the U.V. lamp and avoid allowing fingerprints and other debris to deposit. Carefully place the bulb
inside the quartz sleeve leaving enough space to connect the socket connector to the lamp pins. Slide
the protective brass shrouds over the brass end nuts to secure the lamp is in place.
ULTRAVIOLET LAMP MAINTENANCE REQUIREMENTS:
The U.V. lamp is rated for 9,000 hours of continuous use. After this period of time, the U.V. lamp has
undergone a photochemical change. While the lamp will not normally be burned out, the lamp quartz
may no longer emit the 254-nm shortwave U.V. to effectively kill bacteria. Failure to replace the U.V.
lamps every 9,000 hours may cause bacteriological breakthrough. Should the use of the disinfec-
tion unit be intermittent, in no case should the U.V. lamp be used for more than 24 months regardless
of the number of hours of operation due to normal shelf life degradation of the U.V. bulb. Changing
the quartz sleeve should be done at the same time U.V. lamp replacement is scheduled.
Also replace O-Rings.
Check with the dealer that installed your system, or aquat.com to find the distributor in your
area for replacement parts.
It is recommended that your water supply be tested periodically (yearly) through your local health
department or approved certified laboratory.
ELECTRICAL:
The DWS C Series are furnished with 6' line cord that will plug into a 115V outlet. Electrical recep-
tacles must be properly grounded for safe operation. Improper grounding will void any warranty.
When possible use a separate breaker to minimize voltage fluctuations and avoid accidental shut off.
After unit is installed and water is turned on, plug the unit into 115V wall receptacle.
NOTE: Avoid exposing your eyes to U.V. light.

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SANITATION PROCEDURE FOR INSTALLATION
AND BULB REPLACEMENT:
HOW TO DISINFECT A WATER SYSTEM:
Every new well, or existing water supply system that has been disrupted for service or repair, should be
disinfected before it is returned to use. Water in the well and storage tank should be treated with a strong
chlorine solution to destroy disease causing organisms. All pipelines and fixtures in the distribution system
should be rinsed and flushed with chlorinated water. Upon installation of a U.V. disinfection unit or yearly
bulb replacement service, disinfection with chlorine to initially flush the system is recommended to assure line
sanitation prior to U.V. start up.
The source of chlorine can be ordinary household liquid laundry bleach (about 5.25% available chlorine). The
quantity required depends on the volume of water to be treated. The United States Environment Protection
Agency (EPA) indicated that about 100 parts of chlorine, by weight, mixed in a million parts of water will
destroy essentially all water-borne disease organisms. Table 1 shows the quantity of liquid bleach required to
disinfect wells of various diameters and depths.
DISINFECTION PROCEDURE:
DRILLED WELLS:
Remove the well cap or seal from the casing and measure the depth of the water in the well, then refer to
Table 1 to determine how many chlorine pellets should be used. In some instances removing the seal to
measure the water can be a difficult task, and it is easier to estimate well and water depth from well log or
other records. Determine if there is an unobstructed path from the top of the well to the water level. If it is not
possible to remove the well cap, remove vent or sanitation access plug.
Drop one pellet into the well and listen to hear if it hits the water. If the pellet hits the water, drop one-half the
number of pellets determined to be needed into the well. These will sink to the bottom and sanitize the lower
part of the well.
Mix the remaining pellets in a few gallons of water in a CLEAN plastic container and pour the solution into
the well.
In order to mix the chlorine thoroughly throughout the entire water system, it is necessary to recirculate the
water in the well. This can be accomplished by connection of a hose to an out side faucet that is located after
the pressure tank. Use the hose to run water back down the well (this also rinses upper portion of well). After
about 15 minutes of recirculation of the water, a strong chlorine odor should be apparent. Turn off hose.
Bypass water softener and filters and open each water outlet in the water system until chlorine is
present in water. This procedure assures that all the water in the system is chlorinated.

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Allow the chlorinated water to stand in the system for at least six (6) hour, and preferable overnight.
After this, open an outside faucet system until water runs chlorine free. Repeat flush operation on each
faucet in system.
NOTE:
A.Chlorine may break loose iron deposits, slime and organic material. This material will make the
water run colored. The material broken loose may plug pump screens. Do not continue to
run pump if water doesn’t flow.
B. The high level of chlorine required to sanitize a water system is corrosive to most metals and
chlorine solution must not be allowed to remain in water system more than 36 hours before
being completely flushed from system.
After system has been completely flushed, perform a bacteriological analysis on the water
following all applicable procedures.
NOTE: Always follow the sanitizing procedure required by applicable state or local laws.
EPA Registered: Well sanitizer pellets are EPA Registered for sanitizing potable water.
EPA Registration No. 50510-1.
LARGE DIAMETER WELLS: Dug or bored wells should be disinfected in the same way as a drilled
one. Lower the water level as much as possible, remove the sand, silt and debris, and then treat with the
chlorine solution. Mix thoroughly by circulating the water back into the well and use the hose to rinse the
interior
lining of the well. Do not try to disinfect an unprotected, unlined well because new seepage or surface
contamination will flow into the water about as fast as you can disinfect it. Disinfect the pipeline distribution
system as indicated for drilled wells.
SPRINGS AND CISTERNS:Mix about ½ cup of household bleach in 5 gallons of water and use this
to scrub the walls of the spring box or holding tank. With a constant flow of fresh water from the spring, there
is
probably no way of detaining the chlorine solution in the reservoir for more than a few minutes. However, the
chlorinated water should flow through the pipeline to disinfect the distribution system. Cisterns can be
disinfected in the same way but a source of clean water will be needed to flush the dirty waste out of the
system.
For additional information about how to protect wells and springs and keep them from becoming
contaminated, call or visit your local Cooperative Extension office, or your nearest certified water treatment
specialist.
If this system is used for the treatment of untreated surface waters or groundwater under the direct
influence of surface water, a device found to be in conformance for cyst reduction under the appropriate
NSF/ANSI Standard shall be included upstream of the system.