York YCAL0080SC manual Checking Inputs And Outputs Binary Inputs, ANALOG INPUTS – Temperature

CHECKING INPUTS AND OUTPUTS

BINARY INPUTS

Refer to the unit wiring diagram. All binary inputs are connected to J9 of the microboard. The term “binary” refers to two states –- either on or off. As an example, when the flow switch is closed, 30 volts dc will be ap- plied to J9, pin 5 (J9-5) of the microboard. If the flow switch is open, 0 volts dc will then be present at J9-5.

Pin 1 of J9 is an unregulated 30VDC that is the dc volt- age source used to supply the dc voltage to the various contacts, unit switch, flow switch, etc. This dc source is factory wired to CTB1, terminal 13. Any switch or con- tact used as a binary input would be connected to this terminal, with the other end connecting to it’s respective binary input on the microboard. Anytime a switch or con- tact is closed, 30VDC would be applied to that particular binary input. Anytime a switch or contact is open, 0VDC would be applied to that particular binary input.

Typically, as high as 34VDC could be measured for the dc voltage on the binary inputs. This voltage is in refer- ence to ground. The unit case should be sufficient as a reference point when measuring binary input voltages.

ANALOG INPUTS – Temperature

Refer to the unit wiring diagram. Temperature inputs are connected to the microboard on plug J6. These analog inputs represent varying dc signals corresponding to varying temperatures. All voltages are in reference to the unit case (ground). Following are the connections for the temperature sensing inputs:

Outside Air Sensor

J6-4 = +5VDC regulated supply to sensor.

J6-7 = VDC input signal to the microboard. See Table 47 for voltage readings that correspond to

specific outdoor temperatures.

J6-1 = drain (shield connection = 0VDC)

FORM 150.62-NM1

TABLE 47 – OUTDOOR AIR SENSOR TEMPERATURE/VOLTAGE/ RESISTANCE CORRELATION

TEMP °F	VOLTAGE	RESISTANCE	TEMP C°
0	0.7	85398	-18
5	0.8	72950	-15
10	0.9	62495	-12
15	1.0	53685	-9
20	1.1	46240	-7
25	1.2	39929	-4
30	1.4	34565	-1
35	1.5	29998	2
40	1.7	26099	4
45	1.8	22673	7
50	2.0	19900	10
55	2.2	17453	13
60	2.3	15309	16
65	2.5	13472	18
70	2.6	11881	21
75	2.8	10501	24
80	2.9	9298	27
85	3.1	8250	29
90	3.2	7332	32
95	3.4	6530	35
100	3.5	5827	38
105	3.6	5209	41
110	3.7	4665	43
115	3.8	4184	46
120	3.9	3759	49
125	4.0	3382	52
130	4.1	3048	54

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