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Made in Rome, New York, USA
22
After connecting the thermostat to the unit place the
system switch in
cool
mode. Adjust the set-point tem-
perature 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 condenser will stop (or CW
valve will close) while the indoor fan will remain on for an
additional sixty seconds.
ELECTRIC HEAT OPERATION
Place the thermostat system switch in
heat mode
.
Adjust the set-point temperature above the room tempera-
ture. 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 ad-
ditional sixty seconds.
HYDRONIC HEAT OPERATION
(Optional On CHP And FHP Units)
An optional hydronic heat package may be selected
in lieu of electric heat. Heating operation is essentially the
same as that of units with electric heat. With the thermostat
system switch
set to
heat
and the set-point temperature
above room temperature, the hydronic valve will open al-
lowing water to flow through the coil. The indoor fan will
also switch on and warm air will flow from the unit. Heating
will continue so long as the set-point remains above room
temperature. Place the set-point temperature below room
temperature. The hydronic valve will close and indoor
fan will switch off after the sixty-second purge time has
elapsed.
Units with an optional hydronic heat coil or chilled water
coil are also equipped with a freeze protection thermostat.
The freeze protection thermostat is designed to protect
the hydronic coil or chilled water coil from freeze up due
to abnormally cold fresh air from the fresh air system or
from abnormally cold air from the evaporator coil. Should
the freeze sensor activate, the indoor fan will switch off to
eliminate the source of cold fresh air, and also the outdoor
condensing unit will be switched off eliminating cold air
COMMON TO ALL AIR HANDLERS - SEQUENCE OF OPERATION
Continued
from the refrigeration system. For units with a hydronic hot
water valve installed, the valve will be energized allowing
warm water to flow and assist in the defrost process. The
system will remain in this state until the freeze condition is
satisfied where-by the freeze thermostat will reset.
HEAT PUMP
(Cooling Mode)
Cooling operation in a heat pump unit is described
in “Cooling operation” above. Heatpump condensers are
equipped with a reversing valve that is energized for cooling
and de-energized for heatpump mode.
OPTIONAL HEAT PUMP WITH
ELECTRIC HEAT
(2-Stage Heating)
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
immediately following the off cycle of the outdoor unit. Once
the room temperature is satisfied and the outdoor unit
switches off, the ASCT will not allow the outdoor to restart
unit a three-minute time period has elapsed.
After connecting the thermostat to the unit place the
system switch in
heat
mode. Adjust the set-point tempera-
ture above the room temperature. The compressor and
fan motors will start and heating will begin. Depending on
the thermostat selected, electric heat will also energize
when the deviation between room temperature and set
point temperature is greater than two degrees. (See the
thermostat owner’s manual for this feature) Place the set-
point temperature below the room temperature. The outdoor
condenser and electric heat will stop while the indoor fan
will remain on for an additional sixty seconds.
After starting the unit, complete the
Test Unit Performance Data
sheet on page 23.
Save this information for future servicing. In the event there is a problem with the unit.
Perform the test again (if possible) and have both sets of data ready when
calling for assistance.
