WaterLogic WL250 Manual

WL250
OPERATING, INSTALLATION, AND SERVICE MANUAL
Waterlogic Commercial Products, LLC
11710 Stonegate Circle
Omaha, NE 68164
[phone]
www.waterlogic.us

WL250 OPERATING, INSTALLATION, AND SERVICE MANUAL
Congratulations on your choice of the Waterlogic WL250 water treatment system. The WL250
model dispenses cold, and hot. Every WL250 includes:
Bio-Cote Anti-Microbial Protection
Advanced In-Tank Ultraviolet (UV) Purification
The Waterlogic WL250 provides exceptional quality and great tasting water with every use.
TABLE OF CONTENTS
•Features and Benefits ................................................................. 3
•Certifications............................................................................... 4
•Introduction and Safety Alert Symbols....................................... 5
•Safety Precautions ...................................................................... 6
•Model and Part Designations...................................................... 7
•Specifications .............................................................................. 7
•Operating Instructions ................................................................ 8
•Hot Tank Principles of Operation................................................ 9
•Flow Diagrams........................................................................... 10
•Pre-Installation Procedures ...................................................... 12
•Draining Procedures.................................................................. 16
•Installation Procedures ............................................................. 20
•Service Requirements ............................................................... 22
•Replacement Components ....................................................... 23
•Hot Tank Descaling Instructions ............................................... 24
•Resetting the Overload or High Limit Safety ............................ 26
•Layout Drawings and Part Lists……………………........................... 28
•Main Parts Drawings and Parts Lists......................................... 31
•Wetted Parts Drawing and Parts List ....................................... 37
•Electrical Diagrams.................................................................... 38
•Fault Codes and Troubleshooting............................................. 40
•Warranty .................................................................................. 60
WL250 Operating, Installation, and Service Manual Page 2 - Revision: 5-14-2015

WL250 FEATURES AND BENEFITS
Cold and Hot Water
Counter Top and Tower Models come standard with Cold and Hot Selections to meet a wide range of
customer demands. The Tower Model is also available in Cold Only Water Version.
High Volume Storage and Water Capacity
Tower Model has 4 liters of Cold Water Capacity and 1.6 Liters of Hot Water Capacity.
Counter Top has 2 liters of Cold Water Capacity and 1.6 Liters of Hot Water Capacity.
BioCote®Anti-Microbial Protection
Plastic surfaces surrounding dispensing areas and drip tray are infused with an
exclusive silver additive called BioCote®. Silver is a natural anti-microbial that
inhibits the growth of microorganisms providing additional surface protection.
Large Dispense Area with Recessed Faucet
8.5 inch dispense height with BioCote® recessed faucet to protect from cross-contamination.
Leak Detection
Counter Top Model is supplied with a Sensor in the Leak Tray that halts water supply to prevent
overflow and sounds alarm to reduce accident potential.
Child Safeguard
WL250 requires Hot Water selection followed by main dispense for Hot Water, and defaults back to
cold selection after 3 seconds of inactivity to prevent accidental dispensing of hot water.
In-Tank UV Purification
Industry leading In-Tank UV Purification prevents the growth of bio-film within the Stainless Steel
Cold Tank.
Auxiliary Port
Auxiliary Port to feed Coffee Machines or other Appliances on Counter Top Models.
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WL250 CERTIFICATIONS
Waterlogic water treatment systems have been tested, and certified to rigorous NSF and UL
Standards. We believe that performance testing and certifications validate Waterlogic as a world-
leader in water treatment systems.
WL250Certifications Include
UL399 – Certified Drinking Water Cooler
Intertek Labs (ETL) Certified the WL250 to ANSI/UL 399 Standard for Drinking Water
Coolers.
BPA Free - Waterlogic tests for BPA and declares that all of its products are Bisphenol-A
FREE and contain no harmful BPA plastics.
NSF/ANSI-61 – Certified Drinking Water System Components
The WL-250 has been tested and certified by The Water Quality Association (WQA) to
NSF/ANSI-61, Section 9.
Waterlogic manufacturing is certified to ISO 9001 – Quality Management
Systems (certified by Moody International). ISO 9001 is the
internationally accepted standard for well managed organizations that
have adopted the key quality management principles to its operations to
bring consistent quality products and a culture of continuous
improvement.
Safe Drinking Water Act
Waterlogic water treatment systems conform to the Safe Drinking Water Act (SWDA) “lead-free”
amendment effective January 4, 2014.
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INTRODUCTION
Carefully read and follow all instructions to ensure proper and efficient operation of your WL250.
Contact Waterlogic or an Authorized Waterlogic Dealer if you have any questions.
Waterlogic and Authorized Waterlogic Dealers employ trained service personnel who are
experienced in the installation, function and repair of Waterlogic equipment. This publication is
written for use by these qualified individuals. Waterlogic encourages users to learn about products,
however, we believe that product knowledge and service is best obtained by consulting Waterlogic
or an Authorized Waterlogic Dealer.
Waterlogic water treatment systems should be combined with selected water treatment
components to create a system specifically tailored for each application by trained and qualified
personnel.
Products manufactured and marketed by Waterlogic and its affiliates are protected by patents
issued or pending in the United States and other countries.
Waterlogic reserves the right to change the specifications referred to in this literature at any time,
without prior notice. Changes or modifications not expressly approved by Waterlogic could void the
warranty and user’s authority to operate the equipment.
SAFETY ALERT SYMBOLS
Read and follow all safety information carefully. The signal words used in this manual are selected as
shown below and based on an assessment of the degree of potential injury or damage (severe or
minor) and the occurrence of injury (definitely occurs or has the potential to occur) when the
warning is ignored:
DANGER!
Indicates a situation which, when not avoided, results in death or severe injury.
WARNING!
Indicates a situation which, when not avoided, has the potential to result in death or severe
injury; and/or severe property damage.
CAUTION!
Indicates a situation which, when not avoided, results or has the potential to result in minor
injury; and/or minor property damage.
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SAFETY PRECAUTIONS
Basic safety precautions should be followed, including the following:
DANGER!If incorrectly installed, operated or maintained, this product can cause death or
severe injury. Those who install, operate, or maintain this product should be trained in its proper use,
warned of its dangers, and should read the entire manual before attempting to install, operate, or
maintain this product.
WARNING! Unit is to be used for its intended purpose as described in this manual, and
untrained individuals who use this manual assume the risk of any resulting property damage or
personal injury.
WARNING!HOT WATER. Unit produces Hot Water up to 188oF. Water above 125oF can cause
severe burns or scalding. Keep unauthorized people and children away from the unit to avoid
accidental dispensing of hot water. Children should not use without supervision.
DANGER! ELECTRICAL SHOCK HAZARD. Always unplug from power supply prior to servicing
equipment to prevent electrical shock.
WARNING! This system to be used for water only and is not intended for use where water is
microbiologically unsafe or with water of unknown quality without adequate disinfection before or
after the system. The system is designed for the supplemental bactericidal treatment of either
treated and disinfected public drinking water, or other drinking water, which has been tested and
deemed acceptable for human consumption by the state or local health agency having jurisdiction.
The system is designed to reduce normally occurring non-pathogenic or nuisance microorganisms
only. System is not intended for treatment of contaminated water.
WARNING! Dispenser Could Tip or Fall causing serious injury. Always install unit on a firm, flat,
and level surface and secure the WL250 to the base cabinet with the screw provided to lock the
components together. Never place heavy items on top of unit and never climb, stand, or hang on unit
or storage cabinet to prevent injury and damage.
CAUTION! INDOOR USE ONLY.Do not install outdoors or where unit is in direct sunlight. Do not
install where ambient temperature goes below 50F or above 97F. Avoid high humidity and moisture.
Product life and performance will be impacted and warranty could be voided.
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MODEL/PART DESIGNATIONS
BRAND NAME DESCRIPTION
MODEL -
PART NUMBER
WL250 Counter Top Waterlogic WL250 Counter Top - Cold and Hot 12-CHCMU3
F-6002-M-HC-UT-CS-INN
WL250 Tower Waterlogic WL250 Tower - Cold and Hot 12-CHCU3
F-6002-FS-HC-UT-CS-INN
WL250 Tower – Cold Only Waterlogic WL250 Tower - Cold 12-CCU3
F-6002-FS-C-UT-CS-INN
SPECIFICATIONS
ITEM WL250 Counter Top WL250 Tower
Water Connection ¼” Quick Connect
Cold Water Temperature
Cold Water Temperature – Factory Set Point 41° - 5°C
(Adjustable) 34° - 54° F. (1.1°- 12.2°C)
Hot Water Temperature 189°F (87°C)
Hot Water Manual Reset
Overload
221°F (105°C)
Recommended Service
Pressure
40-60 psi (275-414 kPa) – Use Pressure Regulator
Maximum Service Pressure 100 psi (689 kPa) – Use Pressure Regulator
Rated Service Flow 0.5 gallons per minute (1.89 Lpm)
Environmental Temperature 35°- 100°F (2°- 37°C)
UV Lamp 4 Watts 8 Watts
Heater 500 W
Refrigerant Gas R134a, 40g, 1.41 ounces R134a, 65g, 2.29 ounces
R134a Pressures High (230 psi), Low (90 psi)
SHIPPING SPECIFICATIONS
ITEM WL250 Counter Top WL250 Tower
Width/Depth/Height
13.5” x 14.5” x 17.75”#(34cm x 37cm x
45cm)
13.5” x 14.5 x 40.5” (34cm x 41cm x
103cm)
Weight (dry) 42 pounds (19.5 kg) 58 pounds (26.5 kg)
ELECTRICAL SPECIFICATIONS
ELECTRICAL SUPPLY 120V/60Hz, 1PH 15 Amp Service
COMPONENT POWER (approximate) AMP DRAW (approximate)
Heater 504 4.2 Amps
Compressor 216 1.8 Amps
UV Lamp System 18 0.15 Amps
WL250 TOTAL 738 6.15 Amps
#WL250 Counter Top is 17.75 in. tall and may not fit between countertops and cabinets - Check installation to ensure adequate clearance.
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OPERATING INSTRUCTIONS
The above picture shows front LCD display and control panel for the Waterlogic WL250.
For Cold Water: Press Cold Water Select Button followed by the Dispensing Button (within 3
seconds).
For Hot Water: Press Hot Water Select Button followed by the Dispensing Button (within 3
seconds).
NOTE: Default selection mode is Cold Water. Selection will return to default after 3 seconds of
inactivity.
NOTE: Selection indication light will turn red when the Hot Water Select button is pressed, and will
switch back to the default green within 3 seconds after dispensing the hot water.
Cold Water
Select
Hot Water
Select
Dispensing Button
Selection Indicator Light
WL250 Operating, Installation, and Service Manual Page 8 - Revision: 5-14-2015

HOT TANK PRINCIPLES OF OPERATION
All Waterlogic Hot Tanks have a built in Vent or
Expansion Chamber in the top of the tank except for
WL270 (GF) units.
The Vent Chamber allows for expansion of the water
when it is heated.
The chambers are separated by a welded-in tank
baffle.
Water always flows into the bottom of the tank and
out the top to the faucet.
The hot tank outlet tube has a restrictor in its base.
This ensures the reservoir is always full by allowing
more water in than out.
There is a small hole in the side of the tank outlet tube
that allows air and water to pass into the vent
chamber as it is heated.
Water in the vent chamber is suctioned back through
the outlet tube vent hole when water is dispensed.
Expansion of water as it is heated in the reservoir will
push the water out the faucet when the outlet tube
vent hole becomes plugged with debris or scale.
The small Outlet Vent Hole is susceptible to scale build
up and is a key indicator that descaling is required.
It is critical to descale the hot tank through the vent
line and outlet line on a regular basis to prevent this
problem.
Descaling through the inlet and/or outlet lines only
will not clean the vent chamber and outlet vent hole
properly.
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WL250 COUNTER TOP WATER FLOW DIAGRAM
WL250 Operating, Installation, and Service Manual Page 10 - Revision: 5-14-2015

Recommended Filtration
WL250 TOWER WATER FLOW DIAGRAM
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PRE-INSTALLATION PROCEDURES
DANGER! ELECTRICAL SHOCK HAZARD.
Only qualified personnel who have read and understand this entire manual should attempt to
install, or service this unit, failure to do so could result in death or serious injury. DO NOT plug
into an electrical supply until specifically instructed.
WARNING! ALWAYS SANITIZE BEFORE USE.
Sanitize before use to eliminate any potential microbiological contaminates.
Materials Needed:
•Personal Protective Equipment. Rubber or Nitrile Safety Gloves and Protective Eyewear
•Phillips Screwdriver
•Temperature Gage
•Water Pitcher or Container to collect water from the faucet
•5 gallon container or drain basin
•Sanitizer - Household Bleach (5.25% Sodium Hypochlorite) or Citric Acid Based Cleaner
•¼” Plastic Tubing, at least 4 feet in length, and assorted ¼” quick connect fittings
•TDS Meter and Test Strips for measuring chlorine - Optional
1. Unpack the Waterlogic WL250 and check exterior for damage.
Flush Filters
CAUTION! FILTER FLUSH REQUIRED.
WL250’s are not supplied with filters. Filters should be configured to optimize your
system…Filters need to be configured and specified to do the job given the local water conditions,
usage, maintenance schedule, and placement restrictions.
In order for our filters to perform as represented and to provide the best quality water possible, it
is essential that filters be replaced periodically. The frequency of filter changes depends upon your
water quality and your water usage. For example, if there is a lot of sediment and/or particles in
your water, then you will have to change your filters more frequently than a location with little to
no sediment. Be sure to replace your filters whenever you notice a decline in the performance,
whether it is a drop in flow rate and/or pressure or an unusual taste in the water.
2. Flush thoroughly per filter manufacturers’ recommendation with fresh water to drain.
3. Once flushed, install the filters. Following the flow direction on the filter.
NOTE: Filters should not be flushed prior to 24 hours before installation to limit Microbial
Growth.
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Sanitizing
Sanitize using a Household Bleach (5.25% Sodium Hypochlorite solution) or other approved
cleaner throughout the cold and sparkling water circuits. Follow all instructions on the sanitizer
and flush with fresh water through the faucet until odor and taste is acceptable.
WARNING! USE PROPER PERSONAL PROTECTIVE EQUIPMENT
Always ensure proper ventilation and use proper personal protective equipment such as gloves
and eye protection when using chemicals. Refer to Material Safety Data Sheet for specific
requirements of each chemical product. Take all necessary precautions to prevent sanitizer from
contacting eyes, clothing, and any other surfaces in could damage (carpets).
4. Disconnect the UV Lamp wiring harness and carefully remove the UV Lamp from the quartz
sleeve.
CAUTION! UV SYSTEM IS FRAGILE. Never handle the UV System
with bare hands. UV Lamp and quartz sleeve must be free of oils and
contaminants to ensure proper operation.
5. Unscrew cold tank/quartz sleeve retaining cap and remove the
quartz sleeve. This will require top cover to be removed to access properly and facilitate
removal.
6. Mix ½ gallon of sanitizer per directions or use Bleach Solution (1 teaspoon = 1/6 oz. = 5 ml = ½ cap
full) of household bleach (Sodium Hypochlorite 5 - 10% Concentration) with 1/2 gallon of water.
Always ensure sanitizer is compatible with stainless steel and acetyl plastic.
7. Pour sanitizer solution into cold tank thru funnel or spout. You may add concentrated sanitizer
(½ cap bleach) directly into empty cold tank instead of premixing.
8. Inspect and clean quartz sleeve and O-ring. Reinstall the quartz sleeve and quartz sleeve
retaining nut. Tighten firmly to ensure proper seal. Over-tightening can cause damage.
CAUTION! DO NOT INSTALL THE UV LAMP AT THIS TIME
The UV will interact with the sanitizer and could potentially cause taste.
9. Connect 40-60 psi regulated, potable water supply to the water inlet bulkhead fitting located on
the back of the unit. Turn on water supply and check for leaks.
DANGER! ELECTRICAL SHOCK HAZARD.
Do not plug in unit unless qualified. Only qualified personnel who have read and understand this
entire manual should attempt to install or service this unit.
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10. Connect WL250 to power.
CAUTION! NEVER TURN ON HEATER BEFORE FILLING HOT TANK.
Red Heater and Compressor Power Switch must be in the O=OFF
position while the hot tank is empty. Damage could occur within one
minute and the overload (high limit) will require manual reset if heater
is turned on with an empty hot tank.
Fill the Cold Circuit with Sanitizer
11. Depress the main dispensing button on the front control panel until cold water/sanitizing solution
comes out the faucet. NOTE: Container and drain basin will be required to catch the water from
the faucet.
WARNING! Use Personal Protective Equipment. Gloves and Eye Protection Required. The first
2 or 3 gallons of water will contain concentrated sanitizer. Use extreme care!
Flushing the Sanitizer from the Machine
12. Place a pitcher, catch basin, or other container under the faucet of the WL250.
13. Flush the Cold Tank. Run several gallons of water through the faucet by dispensing cold water to
dilute and remove the sanitizer from the cold circuit. You can use chlorine test strips to evaluate
the water.
14. Once the sanitizer odor/taste has been flushed out of the cold side of the machine the
sanitization process for the Cold Circuit is complete.
Fill the Hot Tank
15. Press the Hot Water Select Button, followed by the main dispensing button to fill the hot tank.
Water will dispense from the faucet once the hot tank is full. Flush until water is clear.
WARNING! HOT CIRCUIT IS NOT SANITIZED.
Water in the hot circuit is not sanitary until the temperature exceeds 171oF for at least 5 minutes.
UV System Functional Test
WARNING! ULTRAVIOLET RADIATION. Protect your skin and eyes against ultraviolet rays.
Never look directly at an operating UV light. Disconnect wiring before removing.
16. Reinstall the UV Lamp and connect the wiring.
17. Dim or shield the overhead lights and peer into the machine, on top of the cold tank, at the UV
connector and retaining cap. The blue glow indicates that the lamp is lit.
WL250 Operating, Installation, and Service Manual Page 14 - Revision: 5-14-2015

Compressor Test
18. Switch Red Compressor / Heater to I=ON position. Always ensure tanks are full of
water before turning on the heater or the overload (high limit) will open and
require manual reset. If the wire condenser at back of the unit is warm, the
refrigeration system is working.
19. Once the machine reaches its target temperature, the compressor will shut off. Draw a glass of
cold water and verify it is has been chilled to proper temperature.
Heater Test
20. Always ensure tanks are full of water before turning on the heater or the overload (high limit) will
open and require manual reset. It will take the heater approximately 10 minutes to heat the
water from ambient 75°F to the factory set point of 185°F. Dispense a cup of hot water to ensure
the temperature/odor/taste is acceptable.
WARNING! VERY HOT WATER CAN BURN OR SCALD.
Hot water should be dispensed carefully into insulated container to avoid injury.
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WL250 COUNTER TOP DRAINING INSTRUCTIONS
Draining Notes
Drain the WL250 for transportation.
WARNING! STORE UNIT EMPTY.ALWAYS SANITIZE BEFORE REUSE.
The unit must be completely drained and sealed before storing to avoid stagnation and reduce
microbial growth).
Prior to draining the hot tank, turn off the Red Heater and Compressor Power Switch, and
dispense 2 liters of hot water from the machine. As hot water is dispensed from the faucet of the
unit, colder water will be introduced into the hot tank. Since the Red Heater and Compressor
Power Switch is turned off, the heater will not energize and heat the incoming tap water.
Following this precaution prevents exposing personnel and equipment (drains, catch basin, etc.)
to scalding hot water.
Disable Cold and Hot Tanks
1. Turn off the Red Heater and Compressor Power Switch to disable the heater and compressor.
2. Dispense 2 liters of water through the hot tank to cool the water temperature in the hot tank and
avoid burns.
WARNING! VERY HOT WATER CAN BURN OR SCALD.
Hot water should be dispensed carefully into insulated container to avoid injury.
Turn off Water Supply and Bleed Water Pressure
3. Isolate the unit from feed water by turning off the supply.
4. Dispense cold still water to relieve any pressure built up in the system.
5. Remove the water supply line from the inlet line bulkhead fitting at back of machine.
6. Install dust cap or plug into water supply line bulkhead fitting.
Drain the Cold Water Tank and Circuit
7. Remove top cover.
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8. Remove front panel. Remove 2 Phillip screws
securing front panel. Unseat faucet assembly
from panel. Unclip wires from PCB.
9. Disconnect tubing from inlet elbows on both
solenoids and allow water to drain.
10. Reconnect tubing into inlet elbows.
11. Dry inside of unit.
12. Replace front panel.
WL250 Operating, Installation, and Service Manual Page 17 - Revision: 5-14-2015

WL250 TOWER DRAINING INSTRUCTIONS
Draining Notes
Drain the WL250 for transportation.
WARNING! STORE UNIT EMPTY.ALWAYS SANITIZE BEFORE REUSE.
The unit must be completely drained and sealed before storing to avoid stagnation and reduce
microbial growth).
Prior to draining the hot tank, turn off the Red Heater and Compressor Power Switch, and
dispense 2 liters of hot water from the machine. As hot water is dispensed from the faucet of the
unit, colder water will be introduced into the hot tank. Since the red power switch is turned off,
the heater will not energize and heat the incoming tap water. Following this precaution prevents
exposing personnel and equipment (drains, catch basin, etc.) to scalding hot water.
Disable Cold and Hot Tanks
1. Turn off the Red Heater and Compressor Power Switch to disable the heater and compressor.
2. Dispense 2 liters of water through the hot tank to cool the water temperature in the hot tank and
avoid burns.
WARNING! VERY HOT WATER CAN BURN OR SCALD.
Hot water should be dispensed carefully into insulated container to avoid injury.
Turn off Water Supply and Bleed Water Pressure
3. Isolate the unit from feed water by turning off the supply.
4. Dispense cold still water to relieve any pressure built up in the system.
5. Remove the water supply line from the inlet line bulkhead fitting at back of machine.
6. Install dust cap or plug into water supply line bulkhead fitting.
Drain the Cold Water Tank and Circuit
7. Remove lower front panel to access tank feed lines.
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8. Disconnect tank line feed lines from hot and cold inlet
solenoids to drain into basin or catch.
9. Reconnect tubing into inlet elbows once drained.
10. Dry inside of unit if necessary.
11. Replace lower front panel.
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INSTALLATION PROCEDURES
Safety and Installation Guidelines
Ensure all Local, State, and Federal Laws and Codes including health and safety guidelines are met
when installing Waterlogic Equipment. Only qualified service technicians should attempt
installation and service of Waterlogic Equipment.
WARNING!ELECTRICAL SHOCK HAZARD. Always unplug (isolate from power supply) to prevent
electrical shock except where electrical tests are specified.
WARNING! IMPROPER SUPPLY OR CONNECTION CAN RESULT IS RISK OF SHOCK.
Connect to a 15 amp 120V 60Hz properly grounded outlet (GFI is recommended). Ensure polarity is
correct and always use a 3-prong outlet.Consult a qualified electrician if you have any questions.
WARNING! USE ONLY Waterlogic SUPPLIED POWER CORD.Locate system within 5 feet of
power supply. Never use an extension cord or adapter. Do not use a damaged power cord or plug.
Keep power cord out of heavy traffic areas and away from heat sources. Do not, under any
circumstances, remove ground prong or alter the power cord. Never pull the power plug from the
outlet with a wet hand or allow the plug to get wet. Failure to use the supplied power cord will void
UL Certification and Warranty.
CAUTION! INDOOR USE ONLY. Never expose to direct sunlight, heat sources, or ambient air
temperature above 100°F (37°C) or below 35°F (2°C). Install indoors and keep unit away from
excessive humidity. Never expose to freezing temperatures. Ensure there is adequate clearance
around the unit to allow refrigeration system condenser to dissipate heat. Warmer environments
require more clearance around the unit. Minimum clearance around all surfaces of the machine is 2-
inches. Installs where the ambient temperature exceed 80F, require a minimum of 4-inches clearance
for proper heat dissipation and efficient operation.
CAUTION! USE A WATER PRESSURE REGULATOR. Waterlogic will not be responsible for injury or
damage caused by excessive water pressure. Operating pressure must be 40 psi to 60 psi. Be aware
any of potential pressure surges caused by building/municipal pumping stations.
CAUTION! USE UV STABILIZED SUPPLY LINES. Feed the unit with a potable ambient or cold
water supply only. Feed water over 100° F (37°C) can damage the treatment components. Water
block devices and external leak detectors are strongly recommended. Locate the unit as close to the
water supply and the electrical connections as possible.
WARNING! STORE AND TRANSPORT UNIT EMPTY. ALWAYS SANITIZE BEFORE USE.
The unit must be completely drained and sealed before storing to avoid stagnation and reduce
microbiological contamination (potential bacterial growth). Sanitize before use to eliminate any
potential microbiological contaminates
Pre-installation and sanitization procedures as prescribed in this manual must be performed before
installing the WL250.
Always install indoors and place the Waterlogic WL250 on a firm, flat and stable surface.
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