5.3.3.
RECEIVER/DECODER:
The Receiver/Decoder Board is printed circuit board identified as C.I. part # 11-0255. The board compromises the
complete receiver, decoder, and timer functions for the unit.
An effective method of determining condition of the receiver board may be accomplished by listening to the audio at
the output jack identified in Figure K. A head set or suitable audio amplifier will reveal a slight pressure of noise which
gives a general indication if the receiver is operative or inoperative. Depressing the red test button should cause a
loud hum to occur in the headset and cause the
timer and signal LED’s to light. The timer light will extinguish after 5
seconds the signal will extinguish are test button in released. Absence of either of these indications represents
probable receiver board failure.
The microprocessor on the receiver/decoder board controls the decoder, timer, disable functions, and temperature
as explained below.
5.3.3.1
DECODER FUNCTION:
The Microprocessor counts the inputted clicks within a 5 second period from the first click and activates the
corresponding relays to output to the proper control lines.
3 Clicks = 120vac out to Control Line 1
5 Clicks = 120vac out to Control Lines 1, and 2
7 Clicks = 120vac out to Control Lines 1, 2, and 3.
5.3.3.2
TIMER FUNCTION:
After the 5 second timer light goes out. The internal timer will start a 15-minute countdown. After 15 minutes the
board will reset and open and Control Lines that were activated. The timer will reset to 15 minutes if another
selection in made during the countdown period.
The Time out period come preset to 15 minutes but is adjustable in 15-minute periods up to 1 hour by adjusting dip
switch setting on the Receiver/Decoder board. See chart below.
15 Minutes
1 X
O
2 X
N
30 Minutes
1
X O
2 X
N
45 Minutes
1 X
O
2
X N
60 Minutes
1
X O
2
X N
5.3.3.3
DISABLE FUNCTIONS
:
Remote Disable
: A short across these two terminals indicated by a red led next to the terminal block. Will disable the
decoder of the microprocessor and out the unit in stand-bye mode. This is where you could attach a photo sensor or
external switch to disable the unit.
Decoder Disable Switch
: With this switch in the on position as indicated by a red led next to the switch, the unit will
lock in on the last command given during the 5 second activation period. The unit will hold that command for the time
out period and will not accept another command until after the time out period has ended.
Example: If the timer is set to 15 minutes and the decoder receives 7 clicks in the 5 second period the unit will close
relays for Control 1, 2, and 3 and lock them on during the 15 minutes period.
5.3.3.4
TEMPERATURE FUNCTION:
The Microprocessor monitors a temperature IC mounted to the Receiver/Decoder PCB and activates a relay on the
relay board when the temperature drops below 40F. This powers a heater resistor on the bottom of the chassis to
prevent the unit from freezing. Temperature relay activation can be determined by the green LED on the relay board.
