5
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The Ductless Split System of Choice
COMMON TO ALL AIR HANDLERS
Continued
Sw itch
1
2
Cooling only
Open
Open
Cooling Electric or Hydronic Heat
On
On
All Heat Pumps
Open
On
Off = Open
DIP S W ITCH SETTINGS
OPEN
12
ON/OFF SWITCH
The
On/Off
switch is used to turn the equipment on or
off. In the
off
mode the display will be blank and all LED
indicator lights will be dark. To turn on the unit press the
On/off
button once. Room temperature will be displayed
and amber LED indicators will show fan speed and mode
selections (
Figure 5)
.
FAN OPERATION
The indoor unit utilizes a two-speed motor with three
operational fan modes. The
Fan
button will allow the selec-
tion of the desired fan setting. An amber LED indicator will
light next to the fan speed selection. If
Auto
fan mode is
selected then an LED indicator will also light next to
Auto.
High
and
Low
are constant fan settings. The fan will
operate continuous regardless of set point or room tem-
peratures.
Auto
mode is a cycling fan setting.
Auto
fan mode can only be selected if the unit is in
Heat
or
Cool
mode. In
Auto
mode the fan will cycle with
the call for Heat or Cool. Fan speed will be determined by
the microprocessor and speed adjustment will be made
according to room and setpoint temperatures. The fan will
switch to
High
speed when room temperature deviates by
more than two degrees from setpoint. The fan will switch to
low speed if the deviation is one degree. When the room
temperature reaches setpoint temperature the heat/cool call
will then be dropped. The fan will stay on for an additional
60 sec. to purge unit of any residual energy. After the fan
!
!
WARNING
MODE SWITCH
(System Switch)
The
Mode
button will allow the selection of the desired
mode of operation. Colored LED indicators will light next to
the selected mode. With each successive press of the
Mode
button, selection will rotate between
Heat, Cool, Fan or
Dry
mode. If the dipswitches are set for cooling only (off –
off) then
Heat
and
Dry
will not be accessible (
Figure 5)
.
START UP
See the “Common” section of this manual (pages 2-8)
for control details.
• Be sure the filter is in place, the unit is level and
separate any lines that contact each other, before
replacing the cabinet front onto the chassis.
Test each power and circuit connection before power-
ing up the system. Use the unit mounted electronic ther-
mostat controls to start the system.
(See previous pages
3-8 for operating instructions on Control Operation Section,
Thermostat, unit mount or remote.)
NOTE: Check the outdoor unit’s start-up instruc-
tions for specific requirements and procedures.
Operation of the unit depends on the room tempera-
ture. It may be necessary to warm the room before testing
the unit’s cooling abilities.
Refer to the specific model of Air Handler for more
detailed installation instructions. (Pages 10-22)
DIP SWITCH SETTINGS
There are two dipswitches on the relay board that offer
different modes of operation. This allows the unit to be
matched with either a cooling only or heat pump condenser.
Dipswitches are factory set for a cooling only condenser. If
the indoor unit is matched with an EMI single zone or multi-
zone heat pump condenser then, the dipswitches will need
to be changed.
Before accessing the control compartment, dis-
connect power to both the indoor and outdoor
units. Failure to do so could result in serious in-
jury or electrical shock. DO NOT change dipswitch
settings with power applied to the unit.
To gain access to the relay board, first remove the re-
turn air grill from the front of the unit. Then remove any pan-
els or covers to the control section. The relay board is lo-
cated in the control box of the unit. Set the dipswitches
(Figure 4)
according to the table below.
DIPSWITCH ON RELAY BOARD
OPEN
12
Figure 4
Once the dipswitches are set and all covers and panels
are replaced, power can be applied to the equipment. When
24V power is applied, the microprocessor will read the
dipswitch setting.
