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The Ductless Split System of Choice
COMMON TO ALL AIR HANDLERS
Continued
UNITS WITH CONDENSATE PUMPS
EMI Air Handlers are available with an optional conden-
sate pump. Condensate pumps are recommended when it
is not possible to gravity drain the condensation from the
indoor unit. Depending on the pump manufacture the maxi-
mum lift for the pump will vary. Consult the pump instruc-
tions for the maximum lift for the particular pump being used
or refer to specific pump kit information and instructions as
supplied by EMI. (Consult Factory.)
Condensation generated by the evaporator will collect
in the pumps’ reservoir. When the water level is high enough,
a float switch will close and energize the pump motor clear-
ing the water from the reservoir. Should for any reason the
water exceed the maximum preset level, a safety switch
will open, there by interrupting the (Y) signal to the con-
denser. This will prevent the evaporator from generating more
condensation and spilling out of the unit.
EMI may factory install or supply a detailed field instal-
lation kit to follow when pump is purchased as an option
from EMI. (If purchased as an add-on in the field , please
install per manufacturers instructions included with the
pump.
OPTIONAL HEATPUMP WITH
ELECTRIC HEAT
(2-Stage Heating)
For heat pump operation with backup electric heat, first
turn the unit on via the
On/off
button. Select
Heat
mode via
the
Mode
button. The room temperature will be displayed.
Then, by depressing either the
Up
or
Down
arrow once, the
setpoint temperature will appear. The setpoint temperature
can then be changed with each successive press of the
Up
or
Down
arrow or by holding the button in.
Place the setpoint temperature one-degree above the
room temperature. The compressor will start and heating
will continue for a minimum of two minutes and as long as
the setpoint remains above room temperature. Once the
room temperature is satisfied and the two-minute minimum
run time has elapsed, the compressor will cycle off.
(*)
On initial startup (or if power is lost) there is a three-
minute delay between compressor re-starts.
(**)
Some EMI Heat pump condensers are equipped
with a low temperature cutout that will shut down the con-
denser and energize the indoor heat. This is designed to
protect the compressor under certain outdoor conditions.
Next, place the setpoint temperature at least two de-
grees above room temperature. The electric heat will ener-
gize along with the compressor (heatpump) thus two-stage
heating. The electric heat will continue to run until the de-
viation between room temperature and setpoint tempera-
ture is less than two degrees. At that time the electric heat
will switch off and the heatpump will take over the heating
demand. Once the room temperature is satisfied and the
two-minute minimum run time has elapsed, the compres-
sor will cycle off. There is then a three-minute delay before
the compressor can restart. The fan will operate as described
in “Fan Operation”
(
Figure 5)
.
DRY MODE OPERATION
Dry mode will remove humidity from the air while main-
taining a specific setpoint temperature. This is done by en-
ergizing the compressor in cooling along with the electric or
hydronic heater. Dry mode
will not
maintain a specific hu-
midity level. The unit must be equipped with an optional
electric heat element or hydronic coil.
For Dry Mode operation first turn the unit on via the
On/
off
button. Select
Dry
mode via the
Mode
button. The room
temperature will be displayed. Then by depressing either
the
Up
or
Down
arrow once, the setpoint temperature will
appear. The setpoint temperature can then be changed with
each successive press of the
Up
or
Down
arrow or by hold-
ing the button in.
Place the setpoint temperature at a desired room tem-
perature. Depending on the difference between room tem-
perature and set point temperature the compressor and/or
heat source will energize. If the room temperature and
setpoint temperature are the same the compressor will op-
erate in cooling and the electric heat source will also ener-
gize.
Should the room temperature fall below the setpoint tem-
perature by two degrees, the compressor will stop and heat-
ing will continue to boost the room temperature back up to
stepoint 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 stepoint temperature. The fan will operate continu-
ously at low speed while in Dry Mode.
In order to prevent short cycling the minimum on time
for both cooling and heating is two minutes. The minimum
off time is 3 minutes
(
Figure 5)
.
