EMI WLHG09 - Unit-Mounted Controller Operation; Notice

WLCG/WLHG High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008111, Rev. G [06/18/10] 25
Unit-Mounted Controller Operation
NOTICE
When power is rst applied to the con-
trol or aer a power outage there is a
three minute delay before the compres-
sor or electric heat will energize. is is
to protect the unit from short cycling due
to loss of power.
NOTICE
e controller must be congured with
Remote Thermostat OFF to operate
using the unit-mounted controller. See
(Figure 28, Page 22) for details. (Remote
ermostat ON means the unit will be
controlled by a wall thermostat.)
ON/OFF
Pressing the ON/OFF button once will
switch the unit either on or o.
In OFF mode, the LCD will display the •
time of day and day of the week.
In ON mode the LCD display will also •
display the room temperature and the
mode of operation:
Cool –
Heat –
Auto – (Auto changeover — cool/heat)
Dry –
Fan –
While in ON mode, the set point tem-•
perature will display momentarily with
the push of any buon except the ON/
OFF buon.
MODES
e MODE buon allows the selection of the
mode of operation, Cool, Heat, Auto change-
over (ACO), Dry or Fan mode. In Fan mode
either HIGH or LOW will be displayed on
the LCD. See (Figure 28, Page 22).
FAN operation
e indoor unit utilizes a two-speed motor
with three operational fan modes.
e FAN buon will allow the selection of
the desired fan seing in all modes except
Dry mode.
In Dry mode, the fan will operate constantly
at low speed.
e LCD will indicate fan speed selec-•
tion.
When the unit is in Dry mode the •
fan speed will remain constant at Low
speed.
While the unit is in Fan mode, Auto is •
by-passed and only High or Low speeds
are available.
Fan speeds
High and Low are constant fan seings. e
fan will operate continuous regardless of set
point or room temperatures. Auto mode is for
automatic cycling fan operation.
Auto fan mode can only be selected if the unit
is in Heat, Cool or Auto changeover modes.
In Auto Fan mode the fan will cycle with •
the call for Heat or Cool.
Fan speed will be determined by the mi-•
croprocessor and speed adjustment will
be made according to room and setpoint
temperatures.
e fan will switch to High speed when •
room temperature deviates by more than
two degrees from setpoint.
e fan will switch to Low speed if the •
deviation is one degree or less.
When the room temperature reaches •
setpoint temperature the heat/cool call
will then be dropped.
e fan will stay on for an additional 60 •
seconds to purge unit of any residual
energy.