Installation manual

21
Step 23
Plug the transformer into the electrical outlet and turn the power
switch on the opener to the ON position.
The use of a surge protector with the transformer is strongly
recommended.
Step 22
At the AC outlet strip
1
/2" of insulation from the ends of the
low voltage wire. Attach these stripped ends to the transformer
terminals.
A dab of household petroleum jelly on each terminal will help
prevent corrosion.
We suggest crimping a spade tongue terminal (not provided) to
the end of each wire before attaching it to the transformer.
Make sure the exposed wires do not touch each other!
SURGE PROTECTOR
Transformer
Step 21
Strip
3
/16" off the ends of the low voltage wire and twist
tightly. Insert these ends to the 18 VAC INPUT terminal
block located on the control board (see illustration at
right). The wires can be inserted into either terminal
regardless of color. Be certain not to let the exposed
wires touch each other!
Secure the wires by pressing down on the white terminal
block tabs until they lock in place. A dab of household
petroleum jelly on each terminal will help prevent
corrosion.
Spade Tongue Terminal
(not provided)
EDGE RED BLK GREEN SAFETY
CYCLE
RADIO
18 VAC
INPUT
LEARN
TRANSMITTER
COMMON
15 AMP
Wire from
Transformer
Close and lock
wire in place.
Insert wire into
terminal block.
No-Tool Terminal Blocks
1
2
IMPORTANT: The charging circuit built in to the Mighty Mule 250 is designed for the GTO
battery. To avoid possible damage to the Mighty Mule 250 or the battery, ONLY use GTO
replacement batteries.
NOTE: In some cases the battery may need to be charged
for at least 1 hour before proceeding to the next step.