Specifications

ManualsBrandsBryant ManualsHeat Pump551B

APPLICATION DATA (cont)

15.

PERFECT HUMIDITY™ DEHUMIDIFICATION PACKAGE

OPERATING PERFORMANCE —

Perfect Humidity dehu-

midification package operation does not affect the electrical

data. The electrical data remains the same either with or

without the Perfect Humidity package.

The operating and shipping weights will be slightly

increased with the addition of the Perfect Humidity sub-

cooler. See the Physical Data table for added base unit

weight with this option.

Refer to cooling performance data, both with and without

the Perfect Humidity dehumidification package. Note the

greatly improved latent capacity with the Perfect Humidity

dehumidification package.

Static pressure is also slightly affected by the addition of the

Perfect Humidity dehumidification package. See Static

Pressure Drop table on page 43 when using this option.

16.

PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE

FEATURES AND BENEFITS

• The Perfect Humidity dehumidification package can improve

the humidity control of your rooftop equipment 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 Perfect Humidity 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 Perfect Humidity dehumidification package permits build-

ing refrigerators and freezers to operate more efficiently due

to lower relative humidity levels. This is the perfect solution for

supermarket applications.

• The Perfect Humidity subcooling circuit can be operated by a

humidity sensor. If the sensor is used, the Perfect Humidity

circuit will then only operate when needed. If the humidity lev-

els in the occupied space are acceptable (such as in the

spring and fall seasons), the Perfect Humidity circuit will not

operate. The rooftop unit is then able to operate to its full sen-

sible potential, which provides more efficient performance and

energy savings.

• At lower outdoor temperatures, rooftop units with dehumidifi-

cation devices are subject to low suction pressure conditions.

The Perfect Humidity dehumidification package contains a

low-pressure switch that deactivates the Perfect Humidity

dehumidification package under low suction pressure condi-

tions without deactivating the compressors.

• Improved humidity control allows increased outdoor-air venti-

lation in hot and humid geographical areas. Humidity control

also helps to improve the indoor-air quality of the building.

• The Perfect Humidity dehumidification package is factory

installed. There are no additional field installation costs. There

is also no need to purchase a roof curb from another manu-

facturer, as standard Bryant roof curbs will accommodate the

551B rooftop units which have the Perfect Humidity dehumidi-

fication package option installed.

• The Perfect Humidity dehumidification package is engineered

and manufactured by Bryant for Bryant rooftop units. All appli-

cation support, service, and warranty issues can therefore be

handled through one company.

• The slightly lower sensible capacities obtained when using the

Perfect Humidity 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 typi-

cal scenario, a building owner may need 39,000 Btuh of sensi-

ble capacity and 23,000 Btuh of latent capacity (62,000 total

Btuh). To accomplish this without the Perfect Humidity dehu-

midification package, a 7

-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

-ton unit.

The building owner can now purchase a 5-ton unit with the

Perfect Humidity dehumidification package for a small addi-

tional up-front charge, and no reheat device will be necessary

to satisfy the cooling requirements. This reduces both installa-

tion costs and operating costs throughout the life of the

product.