Miller Manufacturing, Glencoe, MN 55336 USA • www.miller-mfg.com
Read Instructions Thoroughly Before Use
CAUTION
1. Have a qualified electrician install a properly grounded
receptacle outlet, acceptable for outdoor use and protected
from snow and rain, immediately adjacent to the location
where the heater will be used.
2. Route the supply cord and locate the heater so as to be
protected from damage (by livestock if using 7521 and 7621)
3. Do not use extension cords.
4. Inspect cord before using.
5. Unplug heater at receptacle outlet when not in use or before
removing from tank or pond.
6. Store heater indoors after winter season.
7. Models P7521 and P7621 are intended to be used only in ponds
for keeping water from freezing during the winter months.
These units have a 15 foot supply cord which allows the unit to
reach the middle of the pond for efficiency reasons. Position the
supply cord around plants and other objects in the pond. Any
excess cord must be stored and protected from damage.
8. Heating element MUST be completely submerged while in use
to prevent risk of fire hazard.
9. Do not tether unit.
CAUTION:
to ensure continued protection against electric shock
hazard, connect to properly grounded outlets only.
Connect
only to a circuit that is protected by a Ground Fault Circuit
Interrupter (GFCI).
This is a sensitive device that cuts off the
electricity if there is any leakage of current. This device may be
obtained from any electrician or hardware store.
INSTALLATION
1.
If the unit is to be used in a non-metallic tank or pond, a
Model 88R guard must be attached
in order to prevent the
heating element from coming in contact with the walls of the
tank. The 88R guard must be purchased separately.
2. The unit should be placed in a tank or pond with water and
then
plugged into a Ground Fault Circuit Interrupter.
3. Some animals--particularly horses--may try to remove the
7521 and 7621 de-icers from the tank. To counteract this, you
may wish to run the cord through PVC or galvanized tubing
extending over the tank. Be sure to allow slack in the cord to
compensate for varying water level.
4. The unit is thermostatically controlled so that it will not turn
on until the temperature drops to around 40°F. If it is removed
from the tank, it will turn on and then shuts itself off in about
60 seconds and will then cycle on and off.
MAINTENANCE
Do not allow lime or other impurities in the water to build up on
the heating element. The frequency of cleaning depends directly
upon the composition of your water supply. To remove buildup,
soak the heating element in vinegar or a lime removing cleaner
obtained at any farm or hardware store. Then use a rough brush
to scrub the element. Do not use steel wool or something that will
scratch the element. Inspect the element for any cracks before
reinstalling.
IMPORTANT
The use of the Model 88R guard is mandatory to prevent the
heating element from coming into contact with combustible
materials such as the side or bottom of a non-metallic tank.
Read and follow all instructions.
ATTACHING THE
GUARD TO
THE DE-ICER
Turn the unit upside down and
place the guard as shown.
Rotate the short spring to thread
it onto the guard and the straight
section of the heating element.
The spring should capture
the cross-wire on
the guard and be
centered around
the copper strap
as shown.
WARRANTY
This de-icer is warranted for a period of 1 year from the date of
purchase. If you believe your de-icer is defective and still within
the warranty period, return it to the factory or place of purchase for
inspection and possible replacement. The warranty is voided if (1)
the ground terminal on the plug has been removed, (2) excessive
deposits have been allowed to accumulate on the heating element,
or (3) there is evidence of general abuse such as animals chewing on
the cord. This warranty does not cover incidental or consequential
damage resulting from either a defect in parts, materials, or
operation failure. Some states do not allow the exclusion or
limitation of the above damages so the above limitation may not
apply to you. No agent , employee, or representative of Miller
Manufacturing has any authority to bind Miller Manufacturing to
any affirmation, representation or warranty directed towards any
products bearing the Miller Manufacturing name, except as stated
herein. This warranty gives you specific legal rights--you may also
have other rights which vary from state to state.
LOCKNDRY® DETACHABLE
POWER SUPPLY CORD
(AVAILABLE SEPARATELY)
The LOCKNDRY® detachable power supply cord provides a secure,
water-resistant connection that is UL approved for use with stock
tank de-icers whereas conventional extension cords are not. The
LOCKNDRY® cord set features:
- Plugs into any normal 3-prong outlet
- Mates with LOCKNDRY® plugs to form a water-resistant seal
- Keeps connection from separating during use
- Second, locking nut for secure connections
- Outdoor approved cord set
- UL listed
CAUTION
To provide continued protection against shock:
a) Connect the heater appliance and LOCKNDRY® per these
instructions and those provided with the LOCKNDRY®
cord set.
b) Connect only to a properly grounded GFCI protected
receptacle outlet.
c) Use no more than one LOCKNDRY® cord set – for an installation.
Do not use an extension cord if the receptacle is located such
that the heater and/or LOCKNDRY® cord set cannot be plugged
in. Have a qualified electrician install a properly grounded GFCI
protected receptacle outlet, acceptable for outdoor use and
protected from snow and rain where the heater will be used.
d) Use only the LOCKNDRY® cord set referenced in the instructions.
e) Locate the heater and route its supply cord and LOCKNDRY®
cord set so as to be protected from damage.
f) Keep the LOCKNDRY® and heater supply cord set connection a
minimum of 6 inches above ground to avoid wetting by pooling
water or accumulated snow.
g) Inspect heater supply cord and LOCKNDRY® cord set before
using. Do not use if the supply cord and/or LOCKNDRY® cord set
is damaged.
h) Do not unplug heater from the LOCKNDRY® cord set. Unplug the
LOCKNDRY® cord set only at receptacle outlet when not in use or
before moving location of heater.
i) Store the LOCKNDRY® cord set and heating appliance indoors
after the winter season.
INSTRUCTIONS FOR
THE LOCKNDRY®
CORDSET
(1) Insert the plug into the receptacle
just as you would a normal extension
cord making sure the plug is fully
inserted.
(2) Slide the large nut forward to
engage the threads on the plug.
(3) Rotate the nut to tighten the
plug against the receptacle.
(4) Slide the second, thinner, red
nut forward to engage the threads.
(5) Rotate the red nut snuggly
against the larger nut.
FLOATING DE-ICERS
Item # 7521 & # P7521 - 1500 watts, 120 VAC, 60 Hz
Item # 7621 & # P7621 - 1000 watts, 120 VAC, 60 Hz
Item # 521G - 1500 watts, 120 VAC, 60 Hz
304114
SPRING
CROSS-WIRE
GUARD
COPPER
STRAP
HEATING
ELEMENT