A & T International 1 Service Manual page 15

Optional Electric heat operation
Important: The dip switch 1& 2 must be set to ON
For electric heat operation turn unit on via On/Off button.
Select Heat mode via Mode button. Room temperature will
be displayed. Then press either Up or Down arrow once,
setpoint temperature will appear. Setpoint temperature
can then be changed with each successive press of Up
or Down arrow or by holding button in. Place setpoint
temperature above room temperature. Electric heat will
energize and heating will continue as long as setpoint
remains above room temperature. Once room temperature
is satisfied electric heat cycles off. Fan will operate as
described in "Fan Operation" (Figure 5).
Dry Mode Operation
Dry mode removes humidity from air while maintaining
specific setpoint temperature. This is done in cooling along
with electric or hydronic heater. Dry mode will not maintain
specific humidity level. Unit must be equipped with optional
electric heat element or hydronic coil.
For Dry Mode operation turn unit on via On/off button.
Select Dry mode via Mode button. Room temperature
is displayed. Then press either Up or Down arrow once,
setpoint temperature will appear. Setpoint temperature can
then be changed with each successive press of Up or Down
arrow or by holding button in.
Place setpoint temperature at desired room temperature.
Depending on difference between room temperature and
set point temperature cooling and/or heating will energize.
If room temperature and setpoint temperature are the
same unit will operate in cooling and electric heat source
will also energize.
Should room temperature fall below setpoint temperature
by two degrees, cooling stops and heating continues to
boost room temperature back up to stepoint temperature.
If room temperature rises above setpoint temperature by
two degrees, heating will stop and cooling will continue
to bring room temperature back down to stepoint
temperature. Fan will operate continuously at low speed
while in Dry Mode.
OPTIONAL ELECTRIC HEAT OPERATION
Units With Condensate Pumps
EMI Air Handlers are available with optional condensate
pump. Condensate pumps are recommended when it is
not possible to gravity drain condensate from indoor unit.
Depending on pump manufacture maximum lift for pump
will vary. Consult pump instructions for maximum lift for
pump being used or refer to specific pump kit information
and instructions as supplied by EMI.
Condensate generated by the evaporator will collect in
pumps' reservoir. When water level is high enough, float
switch closes and energizes pump motor clearing water from
the reservoir. Should the water exceed maximum preset
level, safety switch will open. This prevents evaporator from
generating more condensate and spilling out of the unit.
15