Micro-Processor Operation - Modine Manufacturing SSD Installation And Service Manual

MICRO-PROCESSOR OPERATION

Micro-Processor Controls Operation
Receiver
The IR receiver is an extension of the control board and is
located on the fascia of the unit, connected by means of a 7-pin
plug and socket.
Figure 18.1 - Unit Mounted Receiver
The microprocessor controller has a built-in diagnostics feature
so that in the event of an alarm, the nature of the fault can be
determined. The yellow timer/alarm LED flashes on the fascia in
a pre-determined frequency depending on the fault. These are
identified below in Table 18.1.
Table 18.1 - LED Identification
LED NAME LED State
"On" ON
"On" OFF
"Timer" Blinking
"Timer" & "On" Blinking synchronous
Transmitter
On/Off
Press the ON/SEND button to activate the cassette unit and/or
updating information.
Fan Speeds
Press the FAN button to switch between fan speeds:
High Speed
Medium Speed
Low Speed
Auto Speed
18
System State
ON
OFF
a. Timer ON
b. Power returned after break
while Timer was active
a. Fault "F1" indication – error
with unit mounted return air
sensor.
b. Fault on T4,0 input (input
was opened more than 10
seconds)
- Condensate High Level
- Freeze stat alarm
8-504.11
Press the ON/SEND button to send information to the cassette
unit.
Modes
Press the MODE button to switch between:
Cool
Heat
Auto Change-over
Fan Only
Press the ON/SEND button to send information to the cassette
unit.
Figure 18.2 - Remote Transmitter