Carrier ZONEKIT2ZCAR → ÐTemperature/Ohm/Voltage Relationship, → ÐWiring Diagram Reference

→Table 3 shows a temperature/ohm/voltage relationship to help aid in troubleshooting the WeatherMaker Two-Zone System. This table will evaluate both the Duct/HP temperature sensor operation. Use a digital multimeter to perform the following:

To verify a sensor is good, disconnect both leads from the I/O board and measure the resistance through the sensor. Match ohm reading to table and compare temperature reading on table to ambient temperature surrounding sensor (Accuracy should be ± 5-10 percent). Example: if 10.92k

ohms are measured, this equals approximately 73°F.

To verify if I/O board is normal, reattach sensor to I/O board, set meter to 5vdc, and measure voltage across terminal connections. Match voltage reading to temperature reading in chart. The ambient temperature surrounding sensor should be ± 5-10 percent. Example: 2.61vdc is

approximately 73°F.

→Table 3ÐTemperature/Ohm/Voltage Relationship

TEMP °F	OHMS	VOLTS	TEMP °F	OHMS	VOLTS	TEMP °F	OHMS	VOLTS	TEMP °F	OHMS	VOLTS
30	34,367	3.873	73	10,921	2.610	117	4042	1.439	160	1693	0.724
32	32,654	3.828	75	10,449	2.555	118	3889	1.400	162	1637	0.703
34	31,030	3.781	77	10,000	2.500	120	3743	1.362	163	1582	0.683
36	29,498	3.734	79	9571	2.445	122	3603	1.324	165	1530	0.663
37	28,052	3.686	81	9164	2.391	124	3469	1.288	167	1480	0.645
39	26,686	3.637	82	8776	2.337	126	3340	1.252	169	1431	0.626
41	25,396	3.587	84	8407	2.284	127	3217	1.217	171	1385	0.608
43	24,171	3.537	86	8056	2.231	129	3099	1.183	172	1340	0.591
45	23,013	3.485	88	7720	2.178	131	2986	1.150	174	1297	0.574
46	21,918	3.433	90	7401	2.127	133	2878	1.117	176	1255	0.558
48	20,883	3.381	91	7096	2.075	135	2774	1.086	178	1215	0.542
50	19,903	3.328	93	6806	2.025	136	2675	1.055	180	1177	0.527
52	18,972	3.274	95	6530	1.975	138	2579	1.025	181	1140	0.512
54	18,090	3.220	97	6266	1.926	140	2488	0.996	183	1104	0.497
55	17,255	3.165	99	6014	1.878	142	2400	0.968	185	1010	0.483
57	16,464	3.111	100	5774	1.830	144	2315	0.940	187	1037	0.470
59	15,714	3.056	102	5546	1.784	145	2235	0.913	189	1005	0.457
61	15,000	3.000	104	5327	1.738	147	2157	0.887	190	974	0.444
63	14,323	2.944	106	5117	1.692	149	2083	0.862	Ð	Ð	Ð
64	13,681	2.889	108	4918	1.648	151	2011	0.837	Ð	Ð	Ð
66	13,071	2.833	109	4727	1.605	153	1943	0.813	Ð	Ð	Ð
68	12,493	2.777	111	4544	1.562	154	1876	0.790	Ð	Ð	Ð
70	11,942	2.721	113	4370	1.521	156	1813	0.767	Ð	Ð	Ð
72	11,418	2.666	115	4203	1.480	158	1752	0.745	Ð	Ð	Ð

WIRING DIAGRAMS

→Table 4ÐWiring Diagram Reference

OUTDOOR	SINGLE-SPEED	TWO-SPEED	SINGLE-SPEED	TWO-SPEED
UNIT	AIR CONDITIONER	AIR CONDITIONER	HEAT PUMP	HEAT PUMP
Single-Stage Furnace	Fig. 15	Fig. 19	Fig. 23	Fig. 27
Two-Stage Furnace	Fig. 16	Fig. 20	Fig. 24	Fig. 28
Typical Fan Coil	Fig. 17	Fig. 21	Fig. 25	Fig. 29
FK4C Fan Coil	Fig. 18	Fig. 22	Fig. 26	Fig. 30

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