Radome Environmental Control Unit
THE DIGITAL CONTROL
L-2283 ENGLISH
5
M
ODES
OF
O
PERATION
O
FF
M
ODE
When the control is in Off Mode, all control outputs are turned off. Program parameters and user settings are saved in
nonvolatile memory. The Program Mode can only be accessed from the Off Mode.
O
N
M
ODE
When the control is in On Mode, power is supplied to the appropriate outputs and the display indicates the current state of
operation. The operating and program parameters resume based on those last stored when the unit was operating.
C
OOL
M
ODE
When Cool Mode is selected, the Cool LED is lit and the cooling system operates as required.
H
EAT
M
ODE
Not used on Radome ECU unless electric heater option is installed. See Programming Parameter “P-15: Reverse-Cycle or
Electric Heat” on page 8 for more information.
A
UTOMATIC
M
ODE
Automatic Mode is only available if the electric heat option is installed. When Automatic Mode is selected, the system provides
both heating and cooling as required. The Heat LED or Cool LED lights indicate the mode in use. Dome temperature in a given
mode is maintained within 2°F (1.1°C) of set point. If the system was most recently cooling, the dome temperature must drop
below the set point by at least 4°F (2.2°C) in order for the system to switch from cooling to heating. Similarly, if the system was
most recently heating, the dome temperature must exceed the set point by at least 4°F (2.2°C) in order for the system to switch
from heating to cooling. This behavior prevents small temperature overshoots from causing the system to switch between
heating and cooling when it is not necessary. To make the temperature differential between cooling and heating larger, see See
“P-23: Auto Mode Heat Differential” on page 9.
M
OISTURE
M
ODE
Not used on Radome ECU.
F
AN
M
ODES
Automatic Fan Mode
Not used on Radome ECU.
Manual Fan Mode
Not used on Radome ECU.
Fan-Only Mode
Not used on Radome ECU.
Cycled or Continuous Fan Operation
The fan can be set to run continuously whenever the system is turned on, or it can be set to cycle on and off with the
compressor. When “con” is selected, the setting is continuous fan operation.
The default setting for the Radome ECU is “con”.
The cycled setting (“CYC”) is not used on Radome ECU.
P
ROGRAM
M
ODE
Use Program Mode to adjust operating parameters for your particular needs. Program Mode is also used to fine-tune the
system for the most efficient operation within an installation. (Variables such as ducting, sensor location, and system layout
affect system operation.) The control has factory default settings stored in permanent memory that can be recalled. However,
reprogrammed settings can be saved as the new default, thus overwriting the factory defaults. See “P-17: Reset Memorized
Defaults” on page 8 for details.
NOTE
All program parameter settings are factory configured for normal Radome ECU operation and should only be modified
by qualified service personnel.
