• Automatic Operation Mode for Cooling Only Systems
(38HDC, HDL, 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.
• Automatic Operation Mode for Heat Pump Systems (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. 21. 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. 21). The unit is automatically operated in Cooling or
Heating (BK units only) mode according to room tem-
perature. 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.
ADJUSTS IF SHORT
DEFROST CYCLE
(LESS THAN
3 MINUTES)
ADJUSTS IF LONG
DEFROST CYCLE
(MORE THAN
6 MINUTES)
DEFROST REGION ONE
(MINIMUM UNIT RUN TIME
= 50 MIN.*)
DEFROST REGION THREE
DEFROST REGION TWO
(MINIMUM UNIT RUNTIME
= 6 HOURS*)
(NO DEFROST OPERATION)
AT
MAXIMUM
ADJUSTMENT
NOMINAL
(A
T POWER-UP)
AT
MINIMUM
ADJUSTMENT
-10
0
10
20
20
40
OUTDOOR AIR TEMPERATURE (F)
-10
0
10
20
30
40
OUTDOOR COIL
TEMPERA
TURE (F)
*A defrost will be initiated after 30 minutes of compressor run time if the outdoor
coil temperature is less than −4° F.
Fig. 20 — Electronic Control Defrost Regions Map
EMER — Emergency Mode
Fig. 21 — Slide Switch
17
