Carrier 38AN,BK 40QN Thermistor Properties, Troubleshooting, Problem Potential Source Action

Table 11 --40QN Thermistor Properties*

				MINIMUM	NOMINAL	MAXIMUM
TEMP	MINIMUM	NOMINAL	MAXIMUM	THERMISTOR	THERMISTOR	THERMISTOR
(F)	OHMS	OHMS	OHMS	VOLTS --DC	VOLTS --DC	VOLTS --DC
-40	303,300	342,700	356,200	4.80	4.82	4.84
-30	211,500	237,276	265,444	4.72	4.75	4.77
-20	149,721	166,689	185,146	4.61	4.65	4.68
-10	107,379	118,776	130,973	4.48	4.52	4.55
0	77,281	85,677	93,867	4.30	4.35	4.40
10	56,567	62,617	65,205	4.09	4.16	4.21
20	42,661	46,302	50,129	3.86	3.92	3.98
39	32,043	34,580	37,220	3.59	3.66	3.72
32	30,300	32,550	35,120	3.53	3.60	3.66
49	24,061	26,118	27,960	3.28	3.36	3.43
50	18,650	19,900	21,180	2.99	3.05	3.11
60	14,402	15,312	16,219	2.67	2.73	2.79
70	11,247	11,883	12,518	2,36	2.42	2.47
80	8,820	9,299	9,779	2.06	2.11	2.16
90	6,846	7,339	7,754	1.76	1.83	1.58
100	5,487	5,529	6,187	1,52	1,57	1.63
110	4,367	4,667	4,976	1.29	1.34	1,40
120	3,502	3,760	4,026	1.09	1.14	1,19
130	2,830	3,051	3,281	0.92	0.97	1,02
140	2,300	2,489	2,687	0.77	0.82	0,87
150	1,880	2,045	2,216	0.65	0.69	0.74
160	1,547	1,688	1,836	0.55	0.59	0.63
170	1,280	1,402	1,531	0.46	0,50	0.53
180	1,065	1,170	1,282	0.39	0.42	0.45
190	690	982	1,078	0.33	0.36	0.39
299	748	828	913	0.28	0.31	0.33
210	631	701	766	0.24	0.26	0.28
212	611	678	751	0.23	0.25	0.28

"Circuit volts = 5 vdc.

Table 12 -- Troubleshooting

PROBLEM	POTENTIAL	SOURCE	ACTION
	Circuit breaker has tripped or fuse is blown		Reset the circuit breaker or replace the fuse.
Unit does not	Power failure		Restart fun coil unit operation when power is restored.
operate	Voltage is too low		Confirm the available voltage.
	Air filter is blocked with dust		Clean the air filter.
	Temperature is not set properly		Check and reset if necessary.
Insufficient	Window(s) and/or door(s) are open		Close window(s) and door(s).
Cooling	Outdoor unit is obstructed		Remove the obstruction.
	Fan speed is too low		Change the fan speed
	Operation mode is set to fan	or auto. mode	Change to cooling operation or reset temperature
			(using remote controller).
	Air filter is blocked with dust		Clean the air filter.
Insufficient	Temperature is not set properly		Check and reset if necessary.
Heating*	Window(s) and/or door(s) are open		Close window(s) and door(s).
	Outdoor unit is obstnJcted		Remove the obstruction.
Unit stops	Off timer is operating		Turn off the off timer function.
during operation	Room temperature has reached the programmed set point		Normal unit operation.

*Heat pump systems only.

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