DIAGNOSTIC CHECK POINTS con’t

DIAGNOSTIC CHECK POINTS (con’t)

E4 Thermister inputs (measured with thermisters disconnected).

1 to 8 3 to 4.5 VDC – TE2 (Evaporator Thermister #2)

2 to 9 3 to 4.5 VDC – TC1 (Compartment Thermister #1) 3 to 10 3 to 4.5 VDC – TE1 (Evaporator Thermister #1)

4 to 11 3 to 4.5 VDC – TC3 (Compartment Thermister #3) 5 to 12 3 to 4.5 VDC – TE3 (Evaporator Thermister #3)

6 to 13 3 to 4.5 VDC – TC2 (Compartment Thermister #2) 7 to 14 3 to 4.5 VDC


Compressor Relay			(use E3 – 16 as common for measurements)
Com	115	VAC continuous (power line supply).
NO	115	VAC when compressor is running.
NC	Not connected.

Alarm wires	(check for continuity – these are contact closures only)
Black	Common
Red	Normally closed (in no – alarm condition)
White	Normally open (in no – alarm condition)

Display Board (IDB5D –4330)

E1	Display Board receive

1+5VDC

2data signals

3ground

E2	Futaba VFD display data connection

TE = Thermister / Evaporator -- Cut-in (39°F minimum) for Evaporator Temperature TC = Thermister / Compartment – Compartment cut-out Temperature.

Thermister Tolerance ± 2 degrees.