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CONTROL SYSTEM
The 40KMC,KMQ unit is equipped with a microprocessor controls
to operate the system and provide optimum levels of comfort and
operating efficiency.
The main microprocessor is located in the control box of the fan
coil unit with thermistors located in the fan coil inlet and on the
indoor coil. These thermistors monitor the system operation and
control the operating mode. To change the settings or the modes of
operation, use an accessory wireless remote control, an accessory
wired controller, or an accessory Zone Manager.
The 40KMC,KMQ unit has 5 operating modes:
S Fan Only
S Auto (heat pump models only)
S Heating (heat pump models only)
S Cooling
S Dehumidification (Dry)
FAN ONLY -- In Fan Only mode, the system filters and circulates
the room air without changing the room air temperature.
AUTO -- In Auto mode, the system will automatically select one of
the following operating modes: cooling, heating or fan only based
on the difference between the room temperature and the set point
temperature.
HEATING -- In the Heating mode, the system heats and filters
room air.
COOLING -- In Cooling mode, the system cools, dries and filters
room air.
DEHUMIDIFICATION (DRY) -- in Dehumidification (Dry)
mode, the system dries, filters and slightly cools room temperature.
This mode does not take the place of a dehumidifier.
In addition to the above modes that are selected by using the user
interface accessories, the unit can run in two other modes selected
by the manual button:
S EMERGENCY RUN
S TEST MODE
EMERGENCY mode -- is used when the remote control is
misplaced or the batteries in the remote control have expired.
Pushing the EMERGENCY switch under the grille will put the
unit in Auto mode with a predetermined set point (73.4_F/ 23_C) .
TEST mode -- is used when a technician needs to diagnose the
unit for a malfunction. The unit can be set into TEST mode using
either the remote control or sliding the TEST switch under the
grille to the appropriate location. When in TEST mode, the unit
will run in cooling for 30 minutes regardless of the set point.
The microprocessor controls offer additional comfort and economy
features like SLEEP mode, TIMER and AUTO SWEEP. Refer to
the Owner’s Manual for additional details on these features.
USER INTERFACE
Depending on the application, a wired or wireless controller can be
selected to run the unit.
The wireless remote has a range of 26 ft (8 m) when pointed
toward the unit.
For applications that have multiple units, these controls offer
additional flexibility
Two Units In the Same Room Controlled by a
Wireless
Remote
If the two units are working independently, the two remotes can be
configured differently so that the signal from one remote does not
interfere with the operation of the other units.
Multiple Units Controlled by One Wired
Controller
When there is an application where all units require the same
setting, up to 6 units can be daisy--chained and controlled by one
wired remote control. Total length of connecting wire can be up to
500 ft (152.4 m).
Zoning
For applications that require zoning, the Zone Manager is offered
as an accessory. This will allow up to 32 units to be connected in
up to 8 zones. Each zone can be programmed for 7 days with each
dayhaving4periods.
Electric Heat
The 40KMQ has a 3 Kw electric heater factory installed. when the
40KMQ is matched with a heat pump outdoor unit, the electric
heater is supplementary.
When the heat generated from the heat pump cannot meet the
demands of the load, the electric heater is activated until the set
point is satisfied.
When the 40KMQ is matched with a cooling only outdoor unit the
electric heater is activated when the system is in heating mode.
Air Distribution
The in--ceiling cassette units are very versatile with many features
that make them very flexible.
Cooling an adjacent room -- The 40KMC and 40KMQ units are
supplied with pre--punched knockouts that can be used to cool and
heat an adjacent room. The amount of CFM that can be channeled
to an adjacent room is dependent on the amount of static in the
field supplied ductwork. Use the chart in Fig. 9 to determine the
CFM.
Supply air duct to adjacent room
Airflow (cfm)
erusserp citats lanretxE
(in.wg)
0
50
100
150 200
40KMC018,024
40KMQ01824
0.18
250
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
40KMC,KMQ 03036
0
NOTE: When two louvers are closed, the fresh airflow towards the adjacent room
is 50% higher than when one louver is closed (with equal static external pressure).
A07178
Fig. 9 – Pressure Drop for Conditioned Air Supply to an Adjacent Room: One Louver Closed
4QKMC, KMQ / 38HDF, QRF
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