After Extended Shutdowns — If the system has been
turned off for more than 12 hours, turn on the indoor and
outdoor unit disconnect switches to supply power to the sys-
tem for 12 hours BEFORE starting the system.
Seasonal Changeovers — When changing heat pump
system from cooling to heating or heating to cooling, or be-
fore starting cooling only system after it has been out of use
for the winter season, perform the following steps BEFORE
starting the system:
1. Inspect and clean the outdoor unit, particularly the coil.
2. Clean or replace the air filters in the indoor unit.
3. Clean the indoor unit drain pan and drain pipe, and re-
move any obstructions.
4. Turn on indoor and outdoor unit disconnect switches to
supply power to the system 12 hours before starting the
system.
To Turn the Unit On and Off — To turn the unit on,
press the orange ON/OFF button (See Fig. 18). Unit will start.
To stop unit operation, press the ON/OFF button again. Unit
will stop. Refer to Owner’s Manual enclosed with the fan
coil unit for full remote control operating details.
Adjusting Airflow — The airflow direction may be ad-
justed up and down using the remote controller, and from
side to side by manually moving the vents. For cooling only
units and heat pump units when in the cooling mode, set the
louvers to discharge straight out (parallel to the floor) (see
Fig. 19). For the heat pump units operating in heating mode,
it is recommended that the air discharge louvers be set to
discharge vertically (see Fig. 19).
The swing range shown in Fig. 19 is the range which will
provide maximum occupant comfort in each mode. It is rec-
ommended that the louvers be positioned within this range
(using the remote controller).
NOTE: The full swing range for the mode selected will au-
tomatically be used if auto. fan mode is selected.
Operating Mode Memory — After the system is turned
off or after a power failure, the system remains in the last
operating mode selected. When the system is turned back
on, or when power is automatically restored, operation con-
tinues in the same operating mode as when power shut down.
Automatic Operation (Auto) Mode — If auto mode
is selected, the system automatically switches the operating
mode from heating (heat pump system only) to cooling, or
from cooling to heating (heat pump system only) depending
on the selected temperature.
NOTE: Between the cooling cycle and the heating cycle there
is a neutral zone of approximately 2° F above and 2° F be-
low the selected temperature when only the fan is operating.
Operating Fault Diagnosis — The system includes
an automatic diagnosis feature which is activated under
difficult or unacceptable operating conditions. If such con-
ditions 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 op-
erating conditions is initiated. The system will then be re-
started automatically, as soon as normal conditions have been
restored, 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 efficiency. 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 (QNH systems) oper-
ating 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 (QNH only), which will
stay energized 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 (QNH only) will remain in the
last operating mode.
Fig. 18 — Remote Controller
*Potential range.
†Desirable 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 this page for more
information.
Fig. 19 — Louver Adjustments
15
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