| Technical
Data Sheet Dissolving Board |
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| 1. |
System Specifications |
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Net Weight: ca. 40 lbs.
Shipping Weight: ca. 42 lbs.
Dimensions: 32” W x 10”H x 24” D |
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| 2. |
System Requirements |
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Electrical: 120 v. AC input, reduced
to 24 v. AC control voltage.
Water: 45 psi minimum fresh water (make-up), ca. 0.9 gpm max.
flow; 3/8” copper tubing connection provided, user should
provide local shut-off valve. |
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| 3. |
System Components |
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a) Water Supply Brass Piping,
consisting of 3/8” inlet copper tubing connection, Y-
strainer, pressure regulator, pressure gauge, vacuum breaker
(backflow prevention) and three solenoid valves..
b)
Two Dissolver Bowls with 120-degree nozzle, with discharge piping
to reservoir.
c) Solution Reservoir,
equipped with level control system and high level indicator
system, and with PVC discharge piping equipped with ½”
FIP adapter for output to customer’s process.
d) Plastic Electrical Control Box containing
level control relay and overflow switch connections to the red
high-level alarm indicator on the DIN electrical cord at the
normally open (N/O) solenoid.
e) Advantage
conductivity meter, used to signal the system that chemicals
have been depleted, causing water flow to be diverted from Dissolver
Bowl #1 to Bowl #2, or shutting down the unit.
f)
120 v. Electric Housing which contains two transformers to convert
120 v supply to 24 v AC operating voltage and a relay to convert
signals from the solids controller to switch water flow to the
next dissolver bowl.
g) 24 v. Electric
Housing containing two time-delay relays and two DPDT relays
to control the activation of the two N/C solenoid valves.
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| 4. |
Mounting |
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a) Unit is pre-drilled
with four (4)- 3/8”d. holes for wall mounting. The fully
loaded weight of the unit will be about 70 lbs. Make sure that
the anchors or mounting mechanism used is sufficient to support
this weight.
b) Units should be mounted
above the level of metering pump inlets to provide flooded suction.
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| 5. |
Installation |
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a) Mount the unit as close as
practicable to the chemical feed pump.
b)
Water: User should provide a local shut-off valve and 3/8”
tubing to hook up to the 3/8” compression fitting on the
unit. Water must be fresh make-up water for the system being
served.
c) Electric: A 6’ power
cord is provided with the unit; it is recommended that a 120
v GFCI receptacle be provided within 4’ of the unit. If
an external alarm is desired, call for wiring instructions.
d) Chemical Pump Connection: A 3/8”
tubing fitting is provided on the unit.
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| 6. |
Operational Overview |
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a) When the unit is turned on,
both solenoid valves #1 opens to let water flow into the system,
filling the reservoir with solution until the middle float switch
is activated to turn off the upper solenoid valve.
b) When chemical pump is activated, chemical
solution is drawn from the white reservoir.
c)
When the reservoir level drops to the low-level float switch
the sensor activates the upper solenoid valve, allowing water
to spray into the jar of chemical in the gray bowl.
d) Water dissolves some of the chemical and
drains into the white reservoir until the level builds and the
middle float switch is activated.
e)
When the middle float is activated, the solenoid valve closes
and water flow stops.
f) This fill/
empty/ refill cycle will continue automatically.
g)
Should the upper solenoid valve remain stuck in the open position
or if leak-by occurs, the upper float switch will activate,
closing the lower (N/O) solenoid valve and activating the alarm
light.
h) Should a power outage occur,
the upper solenoid valve (N/C) closes to prevent an overflow.
i) When all chemical in Dissolver #1 is
used, the solids controller senses a decrease in solids content
and switches water flow from solenoid #1 to solenoid #2 and
lights a yellow light on the control panel. At this time, when
a yellow light is displayed, the jar of chemical in Dissolver
#2 should be moved to Dissolver #1 and a fresh jar placed in
Dissolver #2. The Reset switch must be reset at this time and
feed to Dissolver #1 will restart. When the reset switch is
properly set, only the green Power switch on the panel will
be lit.
j) Should the chemical jars
not be switched as described, flow continues as described in
steps b) through f) above until Dissolver #2 is empty.
k) When Dissolver #2 is empty water flow stops
and a red light on the control panel is activated.
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| 7. |
Start-up and Testing |
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a) Place and seat chemical jars
until secure. Make sure that the red-handled PVC valve in the
discharge line is “Off”.
b)
Before proceeding to turn on the water, first ascertain the
proper operation of the overflow function by plugging in the
unit to a 120 v outlet; you may hear a solenoid valve click
open. Gently lift the lower and middle float switches to close
the solenoid, and lift the top switch. You should hear the lower
solenoid close and observe the red alarm indicator light up;
allow the switches to return to their normal positions, then
turn the local water valve to the “On” position.
c) You should hear the solenoid valves
click open and observe a flow of water into the white reservoir.
d) Water flow should continue until the
middle float switch is activated, at which time the solenoid
valve will close.
e) If the unit fails
to complete any of these steps, please refer to the trouble-shooting
guide or call your local service center.
f)
If all steps above are satisfactory, open the red valve and
turn on the chemical feed pump for normal operation.
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| 8. |
Chemical Jar Changing |
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a) Turn off water supply valve.
b) Remove empty chemical jar from Dissolver
#1 and discard.
c) Remove partially
used jar from Dissolver #2 and insert, top down, into Dissolver
#1.
d) Remove lid from a fresh jar
of chemical and insert, top down, into Dissolver #2.
e) Reset electrical controls by pushing the
main power button twice. When properly done only the green Power
Control light will remain lit. Should you be unable to reset
the unit please call for further instructions.
f)
Re-open the water supply valve.
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| 9. |
Maintenance |
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a) Isolate the system by closing
the water supply valve and the discharge valve.
b)
Disconnect the electrical connection.
c)
Disconnect chemical suction pump fitting at the pump head and
place tubing into bucket.
d) Open
red valve to drain bowl.
e) Open white
reservoir and clean level sensors as needed.
f)
Open Y-strainer and clean screen as necessary. Replace the plug
when finished.
g) If desired, clean
or repair the solenoid valve.
h) Re-connect
tubing to the chemical feed pump; if solution in bucket is useable,
dump into the white reservoir.
i)
Plug system in, open water supply and turn on the chemical feed
pump.
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| 10. |
Troubleshooting |
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Symptom |
Cause |
Repair |
No water spray |
Water supply valve closed |
Open valve. |
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Electricity not connected |
Plug in |
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Either solenoid coil burned out |
Replace coil |
High level alarm on |
Float switches fouled |
Clean |
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One of the N/C solenoid valves leaking;
remove chemical jars and observe which unit (#1 or #2)
has water flow at the nozzle- that solenoid is defective.
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Clean or replace |
Water overflowing and alarm on |
Both solenoid valves damaged or
fouled |
Clean or replace |
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| 11. |
Major Components (See Fig.1)-
* denotes recommended spare part |
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Sub-Assembly |
Part No. |
Description |
A |
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Water Supply Piping |
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1 |
Y- strainer |
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2* |
Solenoid Valve and Coil, 24vAC,
N/O |
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3 |
Pressure regulator, P-50 |
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4* |
Pressure Gauge, 0-60 psi |
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5 |
Vacuum Breaker |
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6 and 7 |
Solenoid valve and coil, 24v AC,
N/C |
B-1 and B-2 |
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Dissolver Bowls |
C |
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Outlet Piping from Dissolver Bowl |
D |
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Reservoir Discharge Piping |
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1 |
½” PVC Valve |
E |
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White Reservoir |
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1 |
Lock Nut |
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2(hidden) |
Float Switches, 3 each |
F |
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Advantage Conductivity Controller |
G |
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120 v.Electronic Housing |
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2(hidden) |
Transformer, 24v AC, class 2 |
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1 (hidden) |
Relay, 120 v., DPDT |
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1 |
Push-button Switch, green |
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1 |
Power cord with compression fitting |
H |
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24 v. Electronic Housing |
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2 (hidden) |
Relays, Octal Base, 24 v AC |
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3 (hidden) |
Relays, DPDT, square, 24v AC |
I |
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Blue Electronic Housing |
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1(hidden) |
Relays, 1 each, 4PDT, 24v AC |
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| 12. |
See Fig. 2 for Typical Installation |
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Figure 1 – United Supply Service, Inc. Dissolver Major Components
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Figure 2 |
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Typical
Cooling System Schematic
Showing
Dissolving Unit & Bleed/Feed Equipment
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