WLCG/WLHG
High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
28
P/N 240008111, Rev. G [06/18/10]
Unit-Mounted Controller Operation
(continued)
continue to boost the room temperature
back up to setpoint temperature.
If the room temperature rises above the
•
setpoint temperature by two degrees,
heating will stop and cooling will continue
to bring the room temperature back down
to setpoint temperature.
The fan will operate continuously at low
•
speed while in Dry mode.
In order to prevent short cycling, there is
•
a two-minute minimum on time for both
cooling and heating. The minimum off
time is 3 minutes.
Also, there is a 30-second delay between
•
the start of the compressor and the start
of the heat source.
Auto changeover operation
For Auto changeover mode (ACO), the unit
must have a heat source and the control must
first be configured properly, Heat source ON.
See (Figure 28, Page 22).
Auto changeover mode will automatically
operate either cooling or heating.
The control will select heating or cooling
•
operation depending on the setpoint
temperature, room temperature and the
differential setting selected in configura-
tion (Figure 28, Page 22).
For Auto Changeover mode, first turn the unit
on via the ON/OFF button.
Select Auto mode via the Mode button.
•
The room temperature and setpoint tem-
•
perature will be displayed.
Press either the Up or Down arrow but-
•
tons to change the setpoint temperature.
The setpoint temperature will change by
one degree with each successive press of
the Up or Down arrow buttons. Holding
the button in will change the temperature
rapidly.
Place the setpoint temperature below the
room temperature by the dead band amount
selected in the configuration mode.
The compressor will start and the unit will
•
run cooling operation as described under
Cool mode, page 26.
If the set point temperature is above the
•
room temperature by the dead band
amount selected in configuration, the unit
will run heating operation as described for
heating modes on page 26.
Manual run mode
This is normal operating (non pre-program
run) mode. Settings for temperature, mode
and fan speed are selected by the user and
will not change with the passing of time. The
word PROGRAM does NOT display on the
LCD.
Pre-programmed run mode
This feature allows the setpoint temperature to
be changed according to the pre-programmed
set point and time of day settings.
The setpoint and time settings are pro-
•
grammed into the control through the
7-day programming setup (see Figure 29,
Page 23).
Pre-programmed run mode can be en-
•
tered from Cool, Heat or Auto modes
only.
Pre-programmed run mode cannot be
•
entered from Dry or Fan modes.
Pressing the PROG button momentarily
•
will enter or exit the pre-programmed
run mode.
PROGRAM will appear in the LCD
•
display.
The setpoint will change to the pro-
•
grammed setting at the time selected.
