Dental Purity DP-850 User manual
DP-850™
Operator’s Manual
4/8OE4U • Lincoln, NE 68524 USA
Tel: 402.467.9300 • Toll Free in the USA: 800.875.5915 • Fax: 402.467.9393
www.dentalpurity.com
Table of Contents
Important Safety Information ...........................................................3
Introduction.......................................................................................4
Record Important Information...........................................................4
Included With Your Distiller...............................................................4
Optional Accessories ........................................................................5
How Your Distiller Works ..................................................................6
Preparing for Installation ..................................................................7
Installation
Connecting the Incoming Water Line ..........................................8
Installing the Boiling Tank Drain Valve ...................................... 11
Connecting the Power Cord ...................................................... 11
Installing the Storage Tank Faucet ............................................ 11
Start-Up
Steam Sterilizing .......................................................................12
Maintenance and Cleaning
Overall Maintenance Requirements..........................................14
Draining the Boiling Tank ..........................................................14
Cleaning the Boiling Tank .........................................................14
Steam Sterilizing .......................................................................15
Cleaning the Exterior ................................................................16
Troubleshooting ..............................................................................17
Electrical Schematic .......................................................................21
Exploded View ................................................................................22
Parts List ........................................................................................23
page 2 DP-850 Owners Manual
DP-850 Owners Manual page 3
Important Safety Information
•If you are not sure that your electrical outlet is properly grounded or that the
circuit protection is correct, have it checked by a qualifi ed electrician.
•Operate indoors only.
•The area MUST be well ventilated.
•WARNING: Disconnect the distiller from the power supply before assem-
bling, adjusting or servicing the distiller.
•NEVER immerse the distiller in water or any other liquid.
•NEVER operate the distiller with a damaged cord or allow the cord to become
exposed to hot surfaces.
•DO NOT let children play with the distiller.
•DO NOT touch the top of the distiller when it is operating because it becomes
very hot.
•Exercise care when removing the boiling tank lid and never remove it when
the distiller is operating.
•Extension cords may be used if care is exercised in their use.
•If an extension cord is used, (a) the marked electrical rating of the extension
cord should be at least as great as the electrical rating of the product; (b) as
the product is of the grounded type, the extension cord should be a grounding
type 3-wire cord; and (c) the longer cord should be arranged so that is will not
drape over the countertop or tabletop where it can be pulled on by children or
tripped over unintentionally.
•The installation and use of this product must comply with all applicable state
and local laws and regulations.
•IMPORTANT: This distiller is designed to be used only with Dental Purity ac-
cessories and replacement components.
•The physiological effects of the operation of this distiller, benefi cial or other-
wise have not been investigated by U.L.
•IMPORTANT: Only authorized Dental Purity Service Centers may access the
electrical panel to change the FUNCTION switch from “Automatic” to “Manu-
al” mode.
•This distiller is equipped with fused pump circuitry. In the event of pump fail-
ure, check the pump fuse located on the panel under the switches. Replace
only with a 1 amp Slo-Blo fuse. Never use any fuse larger than specifi ed.
Introduction
Congratulations on purchasing the fi nest dental water distillation system on the
market. With proper care and attention, the DP-850 will give you many years of
top performance. Please read this manual thoroughly before installing and oper-
ating your DP-850.
Record Important Information
The serial number is found on the back panel. You should record all of the infor-
mation below for future reference.
Date of Purchase:
Model:
Serial Number:
Purchased from:
Included With Your Distiller
In addition to your DP-850 distiller, your box will contain the following:
•Incoming Water Hook-up. Includes:
Saddle tapping valve
Strainer
(2) 1/4” compression nuts
25 feet of 1/4” food-grade tubing
1/4”S x 1/4”T speedfi t elbow
•Also included:
Faucet
5ubber washer
Drain extension tube
Drain Valve
1 foot piece of silicone tubing
Distilled water outlet plug
•Owners Manual, Warranty Card
and Power Cord*
* power cord may not be included in some 240V units.
page 4 DP-850 Owners Manual
Dental Purity DP-850
1/4” tubing
saddle tapping
valve
comp. nuts
faucet
extension
tube
washer
strainer
silicone tubing
drain
valve
plug
speedfit
elbow
DP-850 Owners Manual page 5
Optional Accessories
The following are optional accessories or maintenance items for the DP-850
They may be purchased from your Dental Purity Service Center or directly from
Dental Purity.
•Demand Pump Kit, complete with a 6” lead-free faucet and tubing. To supply
water directly to a remote location. Stock #19116UL (order stock #19117UL
for the Pump Kit with an extended reach faucet.)
•DP-850 Floor Stand with castors, for ease of use, cleaning and service. Stock
#42530.
•Lumen™ cleaner and descaler for cleaning the boiling tank. Stock #6603.
•Stainless steel polish. Stock #6606.
How Your Distiller Works
The DP-850 is designed to produce approximately one gallon of high-quality,
pure distilled water every 3.5 hours, or almost seven gallons in a 24-hour period.
The DP-850 is a fully automatic unit. The water level in the boiling tank and stor-
age tank are controlled by individual fl oats and a set of microswitches.
The boiling tank operates on a modifi ed batch approach. Feedwater is automati-
cally added until a high level is reached and this triggers the heating element and
fan to operate. This begins the distillation cycle.
As the unit distills, the water level in the boiling tank falls. When the water level
gets close to the heating element, the low-level microswitch is triggered, causing
feedwater to be added until the high level is reached. If, for some reason, no wa-
ter enters the boiling tank when needed, the fan and heating element will remain
off until the condition is corrected.
Once the storage tank is full of distilled water, the unit will automatically shut
down. The DP-850 will begin distilling again once the water level in the storage
tank drops to approximately 3/4 full. It continues to operate until the storage tank
is full again.
The distilled drinking water is drawn from the storage tank through a faucet on
the front of the tank. An optional demand pump would allow distilled water to be
delivered to a faucet, chilled/hot water dispenser, refrigerator, icemaker or other
locations as desired.
The DP-850 is equipped with a Manual Drain Valve, which allows the residue
from the boiling tank to be drained periodically.
page 6 DP-850 Owners Manual
DP-850 Owners Manual page 7
Note: The use of softened
water is recommended
to minimize scale
build-up in the boiling
tank and drain valve.
Preparing For Installation
Things to consider when installing your DP-850:
•Select an area that will allow the distiller to remain level. Improper leveling
could affect the production rate.
•The distiller must be located in close proximity to a water supply and an
appropriate electrical supply source. The distiller should also be located in
a well ventilated room.
• The DP-850 can be installed on a countertop, table or on the fl oor. If the
DP-850 is installed on the fl oor, it must be at least eighteen inches above
the fl oor. An optional stand may be purchased for this purpose. This is for
several reasons:
1. Easier position to observe, maintain, and repair.
2. Easier to catch the fl ow from the boiling tank when you drain the
residue water.
3. Easier to catch the water from the storage tank.
•Electrical requirements: Isolated 115 VAC, 15 amp circuit (220 VAC, 4.5
amp). Check the electrical rating on the label on the rear of the distiller.
•When connecting the tubing into the quick-connect fi ttings, it is critical
the tubing be inserted fully! The tubing should insert into the fi tting 1/2”
to 3/4”. Failure to do so could cause water damage. We recommend that
prior to inserting the tubing, you mark
the tubing 1/2” from the end being
inserted into the fi tting (see fi gure 1).
After inserting, pull back on the tubing
to verify it is attached securely. This
should ensure the tubing is properly
and fully installed. Also, make sure the
tubing is cut squarely and is free of
rough edges.
• When disconnecting tubing, push in
on the grey collet while pulling on the
tubing until it releases. See fi gure 2.
page 8 DP-850 Owners Manual
Installation
CAUTION:The DP-850 weighs approximately 42 lbs. Please use caution when
removing it from the carton to prevent injury.
1. Open the carton.
2. Carefully lift the distiller out of the box so it remains in the upright position.
3. Remove and identify all parts kits as listed on page 4.
4. With a pliers, remove the black plug in the fi tting marked “Distilled Water
Outlet”. If you are not installing a demand pump, insert the grey plug, located
in the parts kit bag, into the fi tting, Pump installation information is discussed
later in this manual.
5. Remove the wire tie inside the boiling tank used to restrain the fl oat during
transit.
Connecting the Incoming Water Line
Notes and Cautions:
Note: The use of softened water for the raw water supply is recommended
to minimize scale build-up in the boiling tank and drain valve.
Note: The DP-850 comes standard with a saddle tapping valve. In some
areas a saddle tapping valve may not be permitted. In such instances, con-
tact your plumber for other water line connection options.
Note: Do not plug the unit into the power source until instructed to do so.
CAUTION: DO NOT use a hot water line for your supply line.
CAUTION: DO NOT turn the saddle tapping valve handle before or
during installation. Be sure the piercing lance does not protrude be-
yond the rubber gasket. Failure to do this may result in damage to the
piercing needle.
To hook-up the Incoming Water Line:
1. Locate the items in the parts kit bag as identifi ed on page 4 as “Incoming
Water Hook-Up”.
2. Turn the household water supply OFF.
3, Remove the blue plug in the fi tting marked “Raw Water Inlet”.
4. Install the 1/4” speedfi t elbow onto the fi tting. Pull to test. See fi gure 4.
5a. For installation on copper pipes:
a. Assemble the saddle tapping
valve on the cold water pipe
so the outlet is in a convenient
direction. See fi gure 3.
b. Tighten the screws evenly so
the brackets are parallel. Tighten
fi rmly, but do not overtighten.
c. Connect the 25’ of 1/4” plastic
tubing to the saddle tapping
valve.
d. Cut the required length of tubing to run from
the saddle tapping valve to the distiller, but
make sure you coil a minimum of 8 feet of tub-
ing behind the distiller to allow it to be moved
away from the wall for cleaning or service.
e. Cut a one foot piece of 1/4” tubing off the end
of the tubing to allow the strainer to be installed.
Note: You may also use a piece of tubing that
was cut in step d.
f. Install the one foot piece of tubing into the elbow
on the Raw Water Inlet. Pull to test. See fi gure 4.
g. Install a 1/4” compression nut onto the tubing
coming from the distiller. See fi gure 5.
h. Install the tubing onto the strainer. See fi gure
8. Make sure the tubing is inserted fully into the
strainer and the fl ow is in the correct direction.
Tighten the nut fi rmly. See fi gure 6.
i. Install a 1/4” compression nut onto the tubing
coming from the saddle tapping valve and con-
nect to the inlet stem of the strainer. Tighten
fi rmly. See fi gure 7.
j. Turn the saddle tapping valve handle clockwise
until you feel it is fi rmly seated. Note: You have
now pierced the water supply line and the valve
is closed.
k. Turn the handle counterclockwise to open the valve. Turn on the house-
hold water supply and check the connections for leaks. Tighten where
required.
DP-850 Owners Manual page 9
Caution: Never use the
hot water line for your
incoming water.
Figure 3
Figure 6
Figure 7
Figure 5
Figure 4
page 10 DP-850 Owners Manual
5b. For installation on brass, steel, or PVC pipes:
Note: Make sure the water supply is turned off and drain the line. Make
sure your are using the cold water line.
a. Drill a 3/16” hole in the pipe. Use a hand drill to avoid shock hazard.
b. Turn the saddle tapping valve handle to expose the lance beyond the
rubber gasket no more than 3/16”.
c. Assemble and place the body of the valve over the hole so the lance
fi ts into the hole. Make sure the outlet is in a convenient direction. See
fi gure 5.
d. Tighten the screws evenly so the brackets are parallel. Tighten fi rmly,
but do not overtighten.
e. Turn the saddle tapping vale handle clockwise to close the valve.
f. Connect the 25’ of 1/4” plastic tubing to the saddle tapping valve.
g. Cut the required length of tubing to run from the saddle tapping valve to
the distiller, but make sure you coil a minimum of 8 feet of tubing behind
the distiller to allow it to be moved away from the wall for cleaning or
service.
h. Cut a one foot piece of 1/4” tubing off the end of the tubing to allow the
strainer to be installed. Note: You may also use a piece of tubing that
was cut in step d in the previous section.
i. Install the one foot piece of tubing into the elbow and pull to test. See
fi gure 6.
j. Install a 1/4” compression nut onto the tubing coming from the distiller.
See fi gure 7.
k. Install the tubing onto the strainer. See fi gure 8. Make sure the tubing
is inserted fully into the strainer and the fl ow is in the correct direction.
Tighten the nut fi rmly.
l. Install a 1/4” compression nut onto the tubing coming from the saddle
tapping valve and connect to the inlet stem of the strainer. Tighten
fi rmly. See fi gure 7.
m. Turn the handle counterclockwise to open the valve. Turn on the house-
hold water supply and check the connections for leaks. Tighten where
required.
DP-850 Owners Manual page 11
Figure 8
Figure 10
Installing the Boiling Tank Drain Valve
1. Remove the blue plug from the fi tting marked
“Boiling Tank Drain” on the back of the unit.
Note: Ensure that Teflon tape has been applied
to the threads of the fitting on the drain valve.
2. Locate the drain valve from the parts kit bag and
install it onto the boiling tank drain fi tting . Tighten
using an adjustable wrench. Note: Tighten until the
outlet is pointing down.
3. Insert the drain extension tube into the drain valve.
Note: Make sure the compression sleeve is on the
drain tube.
4. Holding the tube in place, tighten the nut with a 5/8” wrench until the tube is
secure. See fi gure 8.
5. Loosen the nut slightly so the extension tube can be rotated, yet is secure.
Installing the Storage Tank Faucet
Locate the faucet and rubber washer in the parts kitbag. Install the rubber
washer onto the stem of thefaucet.
Remove the red plug in the fi tting on the front of theDP-850.
Connecting the Power Cord
Note: On some 240V units, the power cord may be
sold separately and not included in the part kit bag.
Ensure the Power Switch is turned to the OFF posi-
tion. See fi gure 12 on next page.
1. Locate the power cord in the parts kit bag. Install
the female end of the power cord into the out-
let on the back of the unit marked “Power Cord
Plug”. See fi gure 10.
page 12 DP-850 Owners Manual
Figure 12
Figure 11
Note: Remove the red
caps on the condensing
coil outlet and storage
tank inlet.
Connecting the Steam Tube
Locate the 12” piece of silicone tubing from the parts
kit bag. Place one end on the condensing coil tube
and one end on the tube to the storage tank. See
fi gure 11.
Start-Up
Notes and Cautions:
Note: This system must be fully grounded at all times. The electrical recep-
tacle you use must be a fully grounded, single phase, AC 115-120 volt, 15
amp minimum circuit. If a two-pronged wall receptacle is encountered, it is
the personal responsibility and obligation of the customer to contact a quali-
fied electrician and have it replaced with a properly grounded three-pronged
wall receptacle or have a grounding adaptor properly grounded. If an exten-
sion cord must be used, it should be a 3-wire, 15-amp minimum cord.
CAUTION: Do not, under any circumstances, cut or remove the round
grounding prong from the electrical plug.
Steam Sterilizing
Steam sterilization is a method of disinfecting your distiller and storage tank. It’s
done by allowing the unit to operate without the fan, thus allowing steam to pass
through the system and into the storage tank.
To steam sterilize your DP-850:
1. Plug the distiller power cord into the power supply.
2. Open the storage tank faucet and lock open. Place a
bucket underneath to catch the condensation.
3. Turn the Fan Switch to “Sterilize”. This switch is located
under the top plate. See fi gure 12.
4. Turn the Power Switch to ON.
5. Remove the boiling tank lid and make sure the boiling
tank is fi lling with water. When the water stops, the heat-
ing element will come on.
6. Replace the boiling tank lid. Tighten securely.
7. With the heating element operating and the fan switch set to “Sterilize”, the
unit is steam sterilizing. Allow the unit to steam sterilize for 45 minutes to 1
hour.
8. Turn the Power Switch to OFF.
9. Allow the unit to cool for approximately 15 minutes. Close the storage tank
faucet.
If you purchased a demand pump, install it now by following the instructions
included with the pump kit.
DP-850 Owners Manual page 13
Note: We recommend
you steam sterilize
the DP-850 every four
months or if the unit has
been serviced.
page 14 DP-850 Owners Manual
* More frequent if water is hard
Maintenance and Cleaning
Overall Maintenance Requirements
The following guide should be used for the maintenance of your distiller. The
timing will vary according to your local water conditions. It is your responsi-
bility to maintain your equipment. Without proper maintenance, your distiller
may not produce optimum results. The following is an average guide to main-
tenance:
Twice per month or every 15 gallons* : Drain the boiling tank.
Draining the Boiling Tank
The DP-850 has a manual drain valve that discards the contaminants and
residue out of the boiling tank when opened. This minimizes the build-up of
scale in the boiling tank.
Turn the Power Switch to OFF. Important Note: Drain valve handle may be
hot if the unit has been running. Turn the valve labeled “Boiling Tank Drain”
on the back of the DP-850 and allow the residue to drain into a sink, drain or
bucket. Close the valve and turn the Power Switch to ON and water will begin
entering the boiling tank.
Every month or every 30 gallons* : Clean the boiling tank.
Cleaning the Boiling Tank
Notes and Cautions:
Caution: Under no circumstances should the cleaning solution be
heated and run through a steam sterilization or distillation cycle.
Note: Failure to clean the boiling tank can result in:
a) Scale build-up causing premature heating element failure.
b) Reduced purity of the distilled water due to the possibilities of splash
over of contaminants from the boiling tank.
To clean the boiling tank:
1. Turn the Power Switch to OFF.
2. Carefully feel the boiling tank lid and check the temperature. If it is hot, wait at
least 30 minutes for the unit to cool.
3. After the unit is cool, remove the boiling tank lid.
4. Using a pitcher, add hot water from your tap until it reaches the scale
line.
5. Add Lumen™ by following the directions on the package.
6. Replace the boiling tank lid and let the solution stand overnight.
7. After the scale has softened, open the drain valve on the back of the
unit. This will allow the boiling tank to drain. Close the valve.
8. Rinse the boiling tank using a pitcher of tap water and again open the
drain valve to allow it to drain. Repeat this procedure until boiling tank
is clear of Lumen.
9. Turn the Power Switch to ON. The unit is now ready for normal opera-
tion.
Every 4 months: Steam sterilize.
Note: We recommend steam sterilizing the DP-850 every
four months.
Steam Sterilizing
1. Turn the Power Switch to OFF.
2. Drain the storage tank by opening the faucet on the front of the DP-850.
3. Turn the Fan Switch to “Sterilize”.
4. Open the storage tank faucet and lock open. Place a bucket underneath to
catch condensation.
5. Turn the Power Switch to ON and the Fan Switch to STERILIZE and allow the
unit to steam sterilize for 45 minutes to 1 hour.
6. After sterilization, turn the Power Switch to OFF, close the storage tank faucet
and turn the Fan Switch to “Distill”.
Note: Reattach the inlet tubing of the demand pump, if needed.
7. Turn the Power Switch to ON and the Fan Switch to DISTILL and unit is ready
for normal operation.
Note: You will not be able to use the demand pump until the storage tank is
approximately 1/4 full.
DP-850 Owners Manual page 15
page 16 DP-850 Owners Manual
Every 4 months: Clean the exterior.
Cleaning the Exterior
Use Stainless Steel Polish & Cleaner (stock #6606). It is available from Pure
Water.
2
2
1
1
DP-850 Owners Manual page 17
Troubleshooting
The machine will not operate at all.
Note: The water level in the storage tank must be below 1/2 full before the distiller
will operate.
• Make sure the power cord is plugged into the wall outlet and inserted fully into
the “Power Cord Plug” outlet. Make sure the outlet is working properly.
• Make sure the power switch is ON. Note: The power switch has a light to indicate
that power is on to the unit. If the switch is ON and the power switch light is not
luminated, the ON/OFF switch may be defective and needs to be replaced. If the
circuit breaker has been tripped, reset it by pressing the reset button up.
• If the power light is luminated, check to see if the heater reset on the side of the
unit has popped. If it has, press the reset button with the eraser end of a pencil.
• Make sure the incoming water supply is turned on and is fl owing into the boiling
tank.
• Check all wiring connections on the control relay. Ensure you have voltage to the
relay using a volt/ohm meter.
The boiling tank will not fi ll with water automatically.
Note: Make sure the saddle tapping valve or utility hook-up valve is turned ON to
supply the feed water.
• Make sure the boiling tank fi ll switch is in the AUTOMATIC position.
• If the solenoid hums or clicks when you depress the momentary water switch, but
no water enters the boiling tank, then you have either a clogged solenoid valve;
clogged saddle tapping valve; or clogged pre-fi lter or strainer.
• If the solenoid does not make any noise when the momentary water switch is
depressed, then you have a bad momentary water switch (check with volt-ohm
meter) or a defective solenoid.
• If the fl oat ball inside the boiling tank is resting against the heat tab and is fully
depressing the inside microswitch, you probably need to replace the microswitch.
Check with a volt/ohm meter.
If the microswitch checks out ok, and the heating element and fan come on, then
you may need to replace the relay. Another indication of a bad relay is the heater
reset will likely be popped.
• If the fl oat inside the boiling tank is not moving freely, install a new fl oat repair kit,
with bushing and o-ring.
• IMPORTANT: Only Dental Purity Service Centers may access the electrical
panel to change FUNCTION switch from “Automatic” to “Manual” mode.
4
4
5
5
3
3
page 18 DP-850 Owners Manual
The fan will not operate or is making excessive noise.
• Make sure the fan switch is in the “Distill” position. If so, then you may have a
defective switch. Check with a volt/ohm meter.
• You may have a defective fan motor. If the fan is mounted properly, the fan blade
is not loose around the motor shaft and the blade spins freely when turned by
hand without hitting anything. Check with a volt/ohm meter.
The boiling tank fi lls to normal operating level, but the heating
element will not heat or bring water to a boil.
• If the heater reset is not popped or the fan is running and the boiling tank is full of
water, you may have a defective heating element.
• If water continues to fi ll the boiling tank after draining the tank, and the fan isn’t
operating either, then you may have a defective outside boiling tank microswitch.
Check with a volt/ohm meter.
• Make sure the fl oat is operating correctly and not stuck at bottom of tank.
• Check all wiring connections on the control relay. Inspect for any burnt or dam-
aged wires on the relay. Check the relay with a volt/ohm meter.
The boiling tank overfl ows with water.
Note: If your machine is new, make sure you have removed the wire tie inside the boiling
tank used to restrain the float during transit.
• If the fl oat actuating arm is depressing the inside microswitch and the fl oat rod is
moving freely and fl oats accordingly with the water level, you may have a defec-
tive microswitch. Check with a volt/ohm meter.
If the microswitch checks out ok, and the heating element and fan come on, then
you need to replace the relay. Check with a volt/ohm meter.
• If the microswitch and relay check out ok, then you may have a defective sole-
noid. Turn the power switch to “OFF”. If water continues to fl ow into the boiling
tank, then you need to replace the solenoid.
• If the microswitch and relay are ok and the solenoid is not defective, you may
have a defective momentary water switch. Check with a volt-ohm meter.
• If the fl oat ball is heavy and has scale build-up, clean the boiling tank and, if nec-
essary, replace the fl oat.
• If the fl oat is not moving freely, you may need to install a new bushing and o-ring
or fl oat repair kit.
• If the fl oat ball is full of water, replace the fl oat ball.
Machine does not shut off when storage tank is full.
• If the fl oat is not moving freely, you may need to install a new bushing and o-ring
or fl oat repair kit.
• If the storage tank high-level microswitch is fully depressed, then you may have a
defective microswitch. Depress both the boiling tank and storage tank high-level
microswitches. If the unit does not shut down, remove one wire from the boiling
tank microswitch. If the unit shuts down, replace the boiling tank microswitch. If
the machine does shut down, leave the wire off and remove one wire from the
storage tank high-level microswitch. If the unit shuts down, replace the storage
tank microswitch.
• If the unit does not shut down when removing the wires from testing the boiling
tank and storage tank microswitch wires, then you need to replace the main con-
trol relay.
• If the storage tank fl oat ball is full of water, replace the fl oat ball.
The unit boils the water, but the fan is not working.
• Make sure the fan switch is set to “Distill”.
• The fan switch may be defective. Check with a volt-ohm meter.
• The fan motor may be defective. Check with a volt-ohm meter.
The unit runs a short time and the heater reset pops.
Note: If the reset is popped, use the eraser end of a pencil to reset it.
• If the boiling tank water level is below the heating element, the fl oat may be stick-
ing and you may need to adjust the fl oat or install a new bushing and o-ring or
fl oat repair kit.
• If the unit starts up after it is cooled, you may have a faulty reset.
• Check the outside microswitch with a volt/ohm meter for fl uctations in the switch.
The unit runs a short time and the circuit breaker overload
pops.
Note: If the circuit breaker is popped, press the reset button up.
• If overload pops out again, disconnect the power and check electrical wiring
inside the unit for a shorted wire or component.
• If wiring and components appear ok, replace defective circuit breaker.
• Check the power cord for damage.
9
9
7
7
8
8
6
6
DP-850 Owners Manual page 19
The optional demand pump does not work properly or not at all.
Note: The storage tank must be at least 1/3 full for the pump to operate.
• If the unit is plugged in and the power switch is “On”, you may have a blown fuse,
defective pressure switch or defective pump. Check with a volt/ohm meter.
• If pump cycles on and off, but no water is delivered or it will not shut off after you
close the faucet or cycles on and off when not in use, you may have leaks in your
water line; defective pressure switch; clogged pump valve; loose fi ttings and con-
nections; or a defective pump.
• If pump does not deliver water to the faucet at a steady pressure, you may have
a defective pump.
• If pump does not operate when there is suffi cient water in the storage tank, but
operates when plugged into the wall outlet, you may have a problem with the
storage tank fl oat; defective pump protection fuse; or defective demand pump
plug. Check with a volt-ohm meter.
• If pump will not shut off, you could have air in the line; clogged pump valve; de-
fective pressure switch; or defective pump.
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page 20 DP-850 Owners Manual
Table of contents
