67
The operating and shipping weights will be slightly in-
creased with the addition of the MoistureMiser subcooler.
See the Physical Data table for added base unit weight with
this option.
Refer to cooling performance data, both with and with-
out the MoistureMiser dehumidification package. Note the
greatly improved latent capacity with the MoistureMiser
dehumidification package.
Static pressure is also slightly affected by the addition of
the MoistureMiser dehumidification package. See Static
Pressure Drop table on page 49 when using this option.
MoistureMiser dehumidification package features
and benefits
• The MoistureMiser dehumidification package can
improve the humidity control of your rooftop equip-
ment by up to 40%. This greatly reduces the risk of sick
building syndrome by reducing biological growth in both
ductwork and the rest of the building.
• The MoistureMiser dehumidification package improves
comfort levels in the building by better controlling the
humidity. This improved comfort level allows building
tenants to raise the cooling set point on the thermostats
for accumulated energy savings.
• Better humidity control lowers the risk of humidity-
induced property damage.
• The MoistureMiser dehumidification package permits
building refrigerators and freezers to operate more effi-
ciently due to lower relative humidity levels. This is the
perfect solution for supermarket applications.
• The MoistureMiser subcooling circuit can be operated
by a humidity sensor. If the sensor is used, the Mois-
tureMiser circuit will then only operate when needed. If
the humidity levels in the occupied space are acceptable
(such as in the spring and fall seasons), the Mois-
tureMiser circuit will not operate. The rooftop unit is
then able to operate to its full sensible potential, which
provides more efficient performance and energy
savings.
• At lower outdoor temperatures, rooftop units with de-
humidification devices are subject to low suction pres-
sure conditions. The MoistureMiser dehumidification
package contains a low-pressure switch that deactivates
the MoistureMiser under low suction pressure condi-
tions without deactivating the compressors.
• Improved humidity control allows increased outdoor-air
ventilation in hot and humid geographical areas.
Humidity control also helps to improve the indoor-air
quality of the building.
• The MoistureMiser dehumidification package is factory
installed. There are no additional field installation costs.
There is also no need to purchase a roof curb from
another manufacturer, as standard Carrier roof curbs
will accommodate the 48HJ rooftop units which have
the MoistureMiser dehumidification package option
installed.
• The MoistureMiser dehumidification package is engi-
neered and manufactured by Carrier Corporation for
Carrier rooftop units. All application support, service,
and warranty issues can therefore be handled through
one company.
• The slightly lower sensible capacities obtained when
using the MoistureMiser dehumidification package allow
the unit to operate for an extended period of time. The
more the unit operates, the more air is exposed to the
subcooling coil. This rooftop unit increased latent
capacity results in lower relative humidity levels in the
occupied space.
• It is no longer necessary to oversize equipment and add
reheat devices to properly dehumidify your building.
In a typical scenario, a building owner may need
39,000 Btuh of sensible capacity and 23,000 Btuh of
latent capacity (62,000 total Btuh). To accomplish this
without the MoistureMiser dehumidification package, a
7
1
/
2
-ton unit with a reheat device would be necessary
to attain the higher latent capacity required. This results
in a large up-front expense to oversize the equipment
from a standard 5-ton to a 7
1
/
2
-ton unit.
The building owner can now purchase a 5-ton unit with
the MoistureMiser dehumidification package for a small
additional up-front charge, and no reheat device will be
necessary to satisfy the cooling requirements. This
reduces both installation costs and operating costs
throughout the life of the product.
