Bryant 288A User Manual download pdf (Page 3)

3/10/2006 Infinity/Evolution FAQ Page 3 of 11

5. How do I hook up a power management device supplied by the utility

company to a 2-speed outdoor unit?

New platform units using –A model user Interface have the capability of Utility

Saver devices built into the software for equipment shut down in the cooling mode

only. It will not shut down a heat pump in heating mode when a hybrid heat

system is used. Future software is planned to include heat pump heating

capability.

Previous models are not designed for integration of power management devices,

and their use is not recommended. Some customers have attempted this by

breaking the D wire to the 2-speed outdoor unit. When this is done, the customer

will see a “SYSTEM MALFUNCTION” message on the User Interface when the

device is active. The malfunction message will disappear when the device turns

off. The pre -A system may not function properly if the power management device

is active when recovering from a power interruption. If the User Interface cannot

communicate with the outdoor unit at power up, it will request outdoor unit size

and not recognize the outdoor unit.

6. How do I hook up the system to a fire detection system or Firestat?

Break the D wire between the user interface and the indoor unit. This will stop the

system and the User Interface will go blank.

7. How do I connect a float cut-off switch to the indoor unit?

On original series UI, the use the float switch to break power between the

transformer and indoor unit circuit boad. This will power down the system until the

float switch opens.

On –A models with new platform outdoor units, an option is to use the Utility Saver

input on the outdoor board to shut down the outdoor unit. CURTAILMENT ACTIVE

will be displayed on the UI when the float switch opens.

Can a new –A User Interface be used with an older furnace or fan

coil system?

Yes, a new -A UI can be used with an older system, but not all the new the new

features such as low ambient cooling, utility saver, and auto defrost will not be

available when older units are used.

9. Can an original UI be used with new series outdoor units?

An original UI (software versions 3, 5, 6, 8) will run a new series single stage

outdoor unit OK. New diagnostics will not be available.

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Bryant 288A User Manual Page 3