• Sleep Mode — The sleep mode timer will turn the unit off
when the timer reaches zero minutes. During the first
1
1
⁄
2
hours from the time the sleep mode timer starts, the
room temperature is set back from the selected tempera-
ture a total of 4° F in cooling and 6° F in heating
(BK only).
• Awake Mode — The awake timer will turn the unit on
when the timer reaches zero minutes. The unit will start in
the same mode and at the same selected temperature as
when the system shut off.
•AutomaticOperationModeforCoolingOnlySystems
(38HDC and HDS) — The unit samples the air in the room.
Based on the room temperature, the unit selects one of the
following modes:
1. Cooling Mode — If the room temperature is more than
82.4 F with a preset temperature of 78.8 F.
2. Dry Mode — If the room temperature is more than
75.2 F and less than 82.4 F with a preset temperature of
77 F.
3. Fan Only Mode — If the room temperature is less than
75.2 F.
The preset temperature can be changed by ±4° F using the
remote control.
•AutomaticOperationModeforHeatPumpSystems(38BK)
— The operation mode will be determined after 20 sec-
onds of room monitoring (to determine the room tempera-
ture and the outdoor air temperature).
• Test Mode — The test mode can be selected by setting the
slide switch on the fan coil unit to TEST position. The
slide switch is located on the front of the unit as shown in
Fig. 20. The fan coil unit will start immediately (there is
no compressor time delay when using test mode) in cool-
ing mode with an infinitely low set point. The indoor fan
speed will be at the high setting, and the swing louvers
will be on (moving up and down).
NOTE: The unit cannot be controlled by the remote con-
troller until the slide switch is returned to the REMOTE
position.
• Emergency Mode — This mode is only to be used if the
remote controller is lost, damaged, or the batteries are dis-
charged. To initiate emergency mode, manually move the
slide switch on the fan coil unit to the EMER position
(Fig. 20). The unit is automatically operated in cooling or
heating (BK units only) mode according to room tempera-
ture. Emergency operation settings are as follows:
1. Operation mode: AUTO.
2. Fan Speed: AUTO.
3. Cooling set point: 77 F
4. Timer Mode: Continuous
NOTE: The unit cannot be controlled by the remote con-
troller until the slide switch is returned to the REMOTE
position.
CLEANING AND MAINTENANCE
To avoid the possibility of electric shock, before per-
forming any cleaning and maintenance operations, al-
ways turn off power to the system by pressing the
orange ON/OFF button on the remote controller. Turn
off the outdoor disconnect switch located near the out-
door unit. If the indoor unit is on a separate switch, be
sure it is also disconnected.
For proper system operation, perform the cleaning and main-
tenance operations in Table 6.
Lubrication — The indoor-fan automatic air sweep mo-
tor, and the outdoor fan motor are factory lubricated and re-
quire no oiling.
To Install or Replace Remote Controller
Batteries
Do not drop the remote controller — damage to the
device may result. Avoid getting the controller wet.
NOTE: Before replacing the batteries, note that the remote
controller signal can be affected if electronic fluorescent
lights are installed nearby. The batteries may not need to be
replaced. If you suspect this is the problem, consult your
Carrier distributor.
Table 6 — Cleaning and Maintenance Schedule
TASK MONTHLY QUARTERLY YEARLY
INDOOR UNIT
Clean Air Filters X
Clean Drain Pipe X
Clean Condensate Drain Pan X
Replace Batteries in the Remote Controller X
Clean Indoor Unit Front Panel X
OUTDOOR UNIT
Clean the Fins From Outside X
Open the Unit and Clean Fins Inside X
Remove Dust From Electrical Parts X
Check Electrical Connections are Tight X
Clean Outdoor Fan X
Check that Outdoor Fan Assembly is Tight X
Clean Drain Pan X
NOTE: Maintenance procedures for the outdoor unit are in the 38HDC, HDS, and BK installation instructions.
EMER — Emergency Mode
Fig. 20 — Slide Switch
12
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