Instructions for Floating De-icers Models 7521, 7621, 521G, and 621G

Instructions for Floating De-icers Models 7521, 7621, 521G, and 621G
705 E. North Street
Elburn, IL 60119
Instructions for Floating De-icers
Models 7521, 7621, 521G, and 621G
Setup and Operation
Models 7521 & 521G: 1500 watts, 120 VAC, 60 Hz
Models 7621 & 621G: 1000 watts, 120 VAC, 60 Hz
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 cleaners
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.
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.
3. Inspect the cord before using.
4. Do not use extension cords. Approved for use only with the API LOCKNDRY
detachable power supply cord.
5. Unplug the heater at receptacle outlet when not in use or before removing from
tank or pond.
6. Store heater indoors after winter season.
7. Connect to properly grounded outlets only.
8. Connect only to a ciruit 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.
1. If the unit is to be used in a non-metallic tank, a Model 88R guard must be
attached in order to prevent the heating element from coming in contact with the
walls of the tank. Models 521G and 621G include the 88R guard. For Models
7521 and 7621, the guard must be purchased separately.
2. The unit should be placed in a tank with water and then plugged into a Ground
Fault Circuit Interrupter.
3. Some animals--particularily horses--may try to remove the deicer from the tank.
To counteract this, you may wish to run the cord through PVC or galvanized
tubing extending over the tank or use the API Deicer Safety Tether Model 23ST.
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 shut itself off in about 60 seconds and will then cycle on and off.
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. See the back of this sheet for instructions on attaching
the guard. Read and follow all instructions.
The de-icer has been fully tested and is guaranteed to perform to specifications; there are
no user adjustments or modifications on the unit. However, you can perform certain
checks for the following conditions.
- The tank or pond freezes over:
Unplug the unit and plug in an electrical device such as a lamp or power tool. If no power
is present, check that a breaker has not been tripped or a fuse blown. If the breaker or
fuse is ok, check the wiring to the outlet, otherwise remove the unit from the tank or pond
before resetting the breaker or replacing the fuse, and test the unit with a Ground Fault
Circuit Interrupter (GFCI) as described below.
If the de-icer is located far from the electrical breaker box, there could be a significant
voltage drop in the wiring to the outlet which could reduce the power output of the
de-icer.You should consult a qualified electrician if you suspect this is a problem.
If the air temperature has dropped quickly, some ice may form before the unit senses the
change in temperature. If, however, the ice has not started to melt within 2 hours, you
should return the unit to the place of purchase.
- The livestock are being shocked:
If you suspect that the animals are being shocked when they contact the water, DO NOT
TOUCH THE WATER. Instead, unplug the unit and remove it from the tank for testing.
- To test the unit:
Place the de-icer in a freezer for 20 minutes to make sure that the thermostat is turned on.
Locate a GFCI outlet (typically found in a bathroom in newer homes) and run some water
into a bucket, sink, or bathtub near the outlet. Quickly remove the unit from the freezer,
place it into the water, and plug the unit into the GFCI while taking care not to touch the
water. If the unit trips the GFCI, it is defective and should be returned to the place of
purchase. If it does not trip the GFCI, it is operating properly and is not leaking electricity
to the water. However, there could be electricity entering the tank via the ground wire due
to presence of voltage on the ground circuit in the electrical supply from the building.
Many times, this voltage is coming directly from the electric utility company. For help with
this problem, contact Allied Precision at (800) 627-6179 or (630) 365-0340.
The Model 88R guard comes standard with Models 521G and 621G de-icers. It
should be purchased separately for use with Models 7521 and 7621. The guard
MUST be used when operating the de-icer in a non-metallic tank.
Instructions for attaching the
LOCKNDRY Detachable Power Supply Cord (Available Separately)
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
(1) Insert the plug into
the receptacle just
as you normally
would, making sure
that the plug is
fully inserted.
This de-icer is warranted for a period of 12 months 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 limitatio n may not apply to you. No agent,
employee , or representativ e of Allied Precisio n has any authorit y to bind Allied
Precision to any affirmation, representation or warranty directed towards any products
bearing the Allied Precision name, except as stated herein. This warranty gives you
specific legal rights--you may also have other rights which vary from state to state.
The LOCKNDRY detachable power supply cord provides a secure, water-resistant
connection that is UL approved for use with stock tank deicers 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
(3) Rotate the large nut
to tighten the plug
against the receptacle.
(2) Slide the large nut
forward to engage
the threads on the
(4) Slide the thinner
red nut forward
to engage the
(5) Rotate the red nut until
it is snug against the
larger nut. HAND
CAUTION – To provide continued protection against shock:
a) Connect the heater appliance and API LOCKNDRY per these instructions and those
provided with the API 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.
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