CACH/CAHH/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. G [07/08/10]
39
CACH/CAHH/CAHK Microprocessor Controller Operation
(continued)
POWER/SEND
Pressing the POWER/SEND butt on momen-
tarily will switch the unit either on or off .
In the OFF mode, the liquid crystal dis-
1.
play (LCD) will display the time of day
and day of the week.
In the ON mode the LCD will also display
2.
the room temperature, mode of operation
Cooling, Heating, Auto (Auto change-
over), Dry or Fan mode.
While in the ON mode, the setpoint
3.
temperature will display momentarily
with the push of any butt on except the
POWER/SEND butt on.
Also, when POWER/SEND is held down
4.
for two (2) seconds, the remote transmits
all optional Infrared Hand Held Control-
ler information to the Cassett e.
Mode
NOTICE
Heating, Auto Changeover (Auto)
or Dry modes will not display if Heat
Source is set to OFF in the Confi gura-
tion mode.
Th
e MODE butt on allows the selection of the
mode of operation — Cooling, Heating, Auto
Changeover (ACO), Dry or Fan mode.
In Fan mode either “HIGH” or “LOW” will
appear on the LCD.
Fan Operation
Th
e indoor unit utilizes a two-speed motor
with three operational fan modes — High,
Low and Auto.
Th
e FAN butt on will allow the selection of
the desired fan sett ing in all modes except
Dry mode.
In
Dry
mode, the fan will operate constantly
at low speed. Th
e LCD will indicate the fan
speed selection.
High
and
Low
are constant fan sett ings. Th
e
fan operates continuously, regardless of set-
point or room temperatures.
Auto
fan mode is for auto ramping of fan
speeds.
Auto fan mode can only be selected if
1.
the unit is in Heating, Cooling or Auto
Changeover modes.
In Auto fan mode, the speed is determined
2.
by the microprocessor.
Speed adjustment will be made ac-
a.
cording to room and setpoint tem-
peratures.
The fan will switch to High speed
b.
when room temperature deviates
by more than two degrees from
setpoint.
Th
e fan will switch to Low speed if the
c.
deviation is one degree or less.
Louver operation — CAHH 24 and
CACH 36 only
Th
e louver can be set to oscillate during fan
operation or open to a fi xed sett ing.
When LOUVER is pressed, the word “Lou”,
will display for two seconds along with “ON
or “OFF” to indicate that the louver sett ing
has been changed.