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www.enviromaster.comCAC Cassette Evaporator 18
REMOTE THERMOSTAT OPERATION
for CAC Ductless Split Air Handler
Choosing a Thermostat: EMI offers
several remote thermostats that are com-
patible with the Ductless split system air
handlers. See the latest price list for a list
of available thermostats. It is important to
choose a thermostat that will match the
equipment that you have selected. For
single stage cooling or hearting choose a
single stage Heat/Cool thermostat.
Selecting a Thermostat “By Oth-
ers”: When selecting a thermostat other
than those offered by EMI, it is important
to choose a 24
V thermostat that matches
your application. EMI equipment is com-
patible with
most mercury bulb, digital or
power stealing thermostats.
Cooling Only With Electric Heat or
Hydronic Heat: Select a thermostat that
is compatible with a cooling - electric heat
system. The thermostat should have “R”,
“Y”, “W” and “G” terminals. The thermo
-
stat may also have a “C” terminal.
Fan Operation: Some thermostats
are equipped with an auto/on fan switch.
When this switch is placed in the on po-
sition the indoor fan will run continuous.
When the switch is in the
auto position
the indoor fan will cycle with the call for
heating or cooling.
Fan Purge: The indoor unit is
equipped an electronic circuit board with
a purge feature. After the room thermostat
has been satisfied, the purge feature al
-
lows the indoor fan to remain on for an
additional 60 seconds. This increases ef
-
ficiency by pulling the remaining energy
from the unit.
Cooling Operation: The electronic
circuit board of the indoor unit also has
an anti-short cycle timer (ASCT) feature
designed to protect the compressor from
short cycling. The ASCT is activated im
-
mediately following the off cycle of the
outdoor unit. Once the room temperature
is satisfied and the outdoor unit switches
off, the ASCT will prevent the outdoor
from restarting unit after a three-minute
time period has elapsed.
After connecting the thermostat to the unit
place the system switch in
cool mode. Ad-
just the set-point temperature below the
room temperature. The compressor and
fan motors will start and cooling will begin.
For chilled water systems, the coldwater
valve will open allowing the flow of water.
Place the set-point temperature above
the room temperature. The outdoor con
-
denser will stop (or CW valve will close)
while the indoor fan will remain on for an
additional sixty seconds.
Electric Heat Operation (Optional):
Place the thermostat system switch in
heat mode. Adjust the set-point tempera-
ture above the room temperature. The
electric heat will energize along with the
indoor fan motor. Heating will continue so
long as the set-point remains above room
temperature. Next place the set-point
temperature below room temperature.
The Electric heater will switch off and the
indoor fan will remain on for an additional
sixty seconds.