DIAGNOSTIC CHECK POINTS
(Rfer to Wiring Schematic on Page 19)
Number DescriptionA
E1
Display Board Send
1 +5Vdc
2 data
signals
3 ground
E2
Touch switch inputs (with switches connected), typical
1 +5VDC
2
Ground Common for measurements on E2
3 Not
connected
4
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
5
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
6
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
7 +5Vdc
8
Ground Common for measurements on E2.
9 Not
connected.
10
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
11
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
12
When button is t4Vdc to +5Vdc, otherwise less than +1Vdc.
E3
Outputs and line voltage inputs (loads connected) typical.
1
Showroom switch off = 0V, on = 120VAC
2 – 7
Not connected.
8
Door switch open = 0V, closed = 120VAC.
9
When Zone* is being cooled or service mode = 115 VAC , off = 0V
10
When Zone* is being cooled or service mode = 115 VAC , off = 0V
11
When Zone* is being cooled or service mode = 115 VAC , off = 0V
12
When zone** is being cooled or service mode = 115 VAC , off = 0V
13
When zone** is being cooled or service mode = 115 VAC , off = 0V
14
When zone** is being cooled or service mode = 115 VAC , off = 0V
15
When zone* lights to be on = 115 VAC , off = 0V
16
Power line neutral. Common for all E3 measurements.
* E3 pin 9 Solenoid #1 / pin 10 Solenoid #2 / pin 11 Solenoid #3
** E3 pin 12 Evap. Fan #1 / pin 13 Evap. Fan #2 / pin 12 Evap. Fan #3.
NOTE:
All wiring controlling Fan #3, Sol #3, and both #3 Thermisters have Black strips.
All wiring controlling Fan #2, Sol #2 and both #2 Thermisters have Red strips.
All wiring controlling Fan #1, Sol #1 and both #1 Thermisters have White strips.
14
