Carrier 38AN,BK Louver Adjustments, Operating Fault Diagnosis -- The system includes

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ON/OFF'"---"

BUTTON

Fig. 14 --Remote Controller

		START	COOL*		START
COC_.ING.	DIRECT					HEA'i3NG - DIRECT
LOUVI_RS	SO AIR					LOIJVERS$O AIR
						BLOWSDOWN
OU'T HORIZONTAL						VERTICAL
						_ISCHARGE)
DISCHARGE)
	SWIN G
BLOWSSTRAIGHT		_	SWING	_		is"
	Pd_IGE_'_

RANGE

HEAT

*Potential range. tDesirable range.

NOTE: Unit is equipped with manual air vents which direct the air

from side to side. Up and down louver motion can be selected using the remote controller. For maximum comfort, set louvers within the

swing range, See Adjusting Airflow section on page 14 for more information.

Fig. 15 --Louver Adjustments

Operating Fault Diagnosis --The system includes

an automatic diagnosis feature which is activated under dif- ficult or unacceptable operating conditions. If such condi- tions occur, the system stops automatically, the operating fault signal appears (green "UNIT ON" light on the front of the fan coil unit flashes), and an analysis of the system operat- ing conditions is initiated. The system will then be restarted automatically, as soon as normal conditions have been re- stored, or it will remain off. If the system does not start again, the green "UNIT ON" light will flash an error code.

Microprocessor Control Operation --This sys-

tem is controlled by a microprocessor designed to give op- timum levels of comfort and operating et_ciency. The con- trol is located in the 40QN unit. To operate the unit, the factory- supplied remote controller is required.

There are 9 (QNB systems) or 12 (QNE/H systems) op- erating modes (including the off mode) for the unit. Each mode operates as follows:

•Off Mode -- When the unit is in the Off mode, all func- tions (compressor, outdoor fan, indoor fan, and air sweep)

are off, except the reversing valve (QNE/H only), which will stay deenergized if the unit was last operated in the Cooling mode.

Air Circulation Mode (Fan Operation Only) -- When Air Circulation mode is selected, the indoor fan will operate continuously in the selected speed (high, medium, low, or auto.). If the Auto. mode is selected, the indoor fan will operate at low speed. The compressor and outdoor fan are off. The reversing valve (QNE/H only) will remain in the last operating mode.

Cooling Mode -- When the Cooling mode is selected, the indoor fan will operate continuously at the selected speed if the speed is high, medium, or low. lfthe indoor fan is in Auto. mode, the fan will change operating speeds de- pending on the difference between the room temperature and the set point. The reversing valve (QNE/H only) will be energized. The compressor cannot ran for 3 minutes from the time the system starts up or for 3 minutes from the time the compressor last operated, when the tempera- ture of the room is equal to or greater than the selected temperature, the compressor and outdoor fan will operate until the room temperature is 2 ° F below the set point, and then shut off. When the room temperature is less than the

selected temperature, the compressor and outdoor fan re- main off.

•Maximum Dehumidification Mode -- When the Dehu- midification mode is selected, the indoor fan will operate continuously at the selected speed if the speed is high, me- dium, or low. If the indoor fan is in Auto. mode, the fan will change operating speeds depending on the room tam- perature. If the room temperature is below the set point, the indoor fan will run at ultra-low speed, and the com- pressor could run for up to 4 minutes. (Ultra-low speed is a control-driven speed [not user configurable] used to sample the space when the fan would normally be off.) The re- versing valve (QNE/H only) will be energized. The com- pressor cannot run for 3 minutes from the time the system starts up or for 3 minutes from the time the compressor last operated.

Initial Operation -- When the mode is first selected, one of the following occurs:

1.If the room temperature is above or equal to the selected temperature, the unit will operate for 16 minutes, and the compressor and outdoor fan will operate. The indoor fan will operate as in the Cooling mode. After 16 minutes of operation (or when the room reaches 2 ° F below set point),

the unit switches to normal dehumidification operation.

2.If the room temperature is below the selected tempera- ture, the unit will operate for 8 minutes as follows: the compressor and outdoor fan will operate for 3 minutes. The indoor fan will operate in low speed, and 30 seconds after the compressor stops, the indoor fan stops. The unit remains off for 1 minute, and then the indoor fan starts in ultra-low speed for 30 seconds. The unit then switches to

normal dehumidification operation.

Normal Operation -- One of the following will take place:

1.when the temperature of the room is equal to or greater than the selected temperature (by not more than 3 ° F), the unit will operate for 8 minutes as follows: the compres- sor and outdoor fan will operate for 3 minutes. The in- door fan will operate in low speed, and 30 seconds after the compressor stops, the indoor fan stops. The unit re- mains off for 1 minute, and then the indoor fan starts in ultra-low speed for 30 seconds. The normal dehumidifi- cation operation is repeated for the newly sensed room temperature.

2.If the room temperature is equal to or greater than the selected temperature, but not by more than between 4 ° F and 6 ° F, the compressor and outdoor fan operate for 4 minutes. The indoor fan will run at ultra-low speed and

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