
110
PROGRAMMING A REPLACEMENT ELECTRONIC
TEMPERATURE CONTROL
These instructions apply to programming a Johnson
A419 Electronic Temperature control for cooling mode
application in a Multiplex Beermaster system.
Replacement controls are not pre-programmed at the
factory; thus, the following programming steps are
required.
Hook-up
The following to be performed/checked prior to power
being applied to control:
1. Loosen four cover screws and remove cover to
make wiring connections.
2. Refer to unit wiring diagram to connect input
power and load wiring. Note: Sensor wires to be
connected to two lower terminals of upper left
terminal strip.
3. Ensure jumper on P5 is in “Keypad Unlocked”
position. (Both pins covered)
4. Ensure jumpers on P4 are in “Cooling Mode, Cut-
in at Setpoint” position. (Only one pin on both
jumps covered)
5. Re-attach cover loosely. (It will be removed again
after programming.)
Programming
The following to be performed when power is applied
to control:
1. Press and hold the MENU button until display
changes to flashing SP. (This will take about two
seconds)
2. Press the MENU button to display the current
value. (30)
3. Press the Down
↓
button to change the display to
29.
4. Press the MENU button to save the new value.
5. Press and hold the MENU button until display
changes to flashing SP.
6. Press the Up
↑
button until the display changes to
dIF.
STH13_Tech.book Page 110 Wednesday, September 15, 2010 3:20 PM