Bryant 569F Manual de usuario descargar pdf (Pagina 22)

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OPERATING SEQUENCE

569D072-120, 576C090-120 Units

At start-up, the thermostat calls for cooling. With all safety

devices satisfied, the compressor contactor and fan contactor

energize, causing the compressor and outdoor-fan motor to

operate. Thermostat contacts energize, allowing the field-

supplied and field-installed indoor-fan contactor to function.

A field-supplied and field-installed liquid line solenoid valve

also opens, allowing the system to function in Cooling mode.

As cooling demand is satisfied, the thermostat contacts

break, deenergizing the contactor and causing the system to

shut off. The liquid line solenoid valve closes, minimizing the

potential for refrigerant migration. The compressor does not

restart until the thermostat again calls for cooling. The

system is protected with a safety circuit so that the system

will not start if a fault exists (i.e., high or low pressure fault).

To reset the safety circuit, set the thermostat to eliminate

the cooling demand, then return to original set point. This

should be done only once, and if system shuts down due to

the same fault, determine the problem before attempting to

restart the system.

569F120 Units

When the thermostat calls for stage one cooling at start-up,

and all safety devices are satisfied, the compressor contactor 1

(C1) energizes causing compressor no. 1 and outdoor-fan

motor no. 1 to start (the indoor-fan contactor should be wired

to start at the same time as the compressor). The liquid line

solenoid (LLS) valve will open when compressor no. 1 starts,

allowing refrigerant to flow in the system.

When the thermostat calls for stage two cooling, compressor

contactor no. 2 (C2) energizes causing compressor no. 2 and

outdoor-fan motor no. 2 to start. As the cooling demand

decreases, stage two on the thermostat opens, causing com-

pressor no. 2 and outdoor-fan motor no. 2 to shut down. As

the cooling continues to decrease, stage one of the thermo-

stat opens causing compressor no. 1 and outdoor-fan motor

no. 1 to shut down. The LLS valve for each compressor will

close when the associated compressor stops, minimizing the

potential for refrigerant migration during the off cycle.

The indoor-fan motor will stop if the thermostat is set to

AUTO and will continue to operate if the thermostat is set to

CONT. Each compressor is protected with a Cycle-LOC

device so that the compressor will not operate if there is a

high-pressure fault, low-pressure fault, or a compressor is off

due to internal line break overcurrent/over temperature pro-

tection. To reset the Cycle-LOC device, set the thermostat

higher to remove the cooling demand, then return to the

original set point. This should be done only once. If the sys-

tem shuts down with the same fault, the cause for the fault

should be determined and corrected before the a Cycle-LOC

device is reset again.

566E150-240 Units

At start-up, when the thermostat calls for first stage cooling

and all safety devices are satisfied, the compressor contactor

(C1) energizes causing compressor one and fan motor one to

start. Fan motor no. 2 will start when the fan cycling pres-

sure switch (FCPS) closes as discharge pressure builds. With

the indoor-fan contactor wired to TB2-4 and TB2-9 contacts

on the terminal block, the indoor-fan will also start with the

compressor. The liquid line solenoid (LLS) valve will open

when compressor no. 1 starts, allowing refrigerant to flow in

the system.

When the thermostat calls for stage two cooling, compressor

contactor no. 2 (C2) energizes causing compressor no. 2 to

start. As the cooling demand decreases, stage two on the

thermostat opens, causing compressor no. 2 to shut down. As

the cooling continues to decrease, stage one of the thermo-

stat opens causing compressor no. 1 and outdoor-fan motor to

shut down. The LLS valve for each compressor will close

when the associated compressor stops, minimizing the

potential for refrigerant migration during the off cycle.

The indoor-fan motor will stop if the thermostat is set to

AUTO and will continue to operate if the thermostat is set on

CONT. Each compressor is controlled by the thermostat so

they will not start until there is a demand from the thermo-

stat. Each compressor is protected with a Cycle-LOC

device

so that the compressor will not operate if there is a high-

pressure fault, low-pressure fault, or compressor is off due to

internal line break overcurrent/overtemperature protection.

To reset the a Cycle-LOC device, set the thermostat higher to

remove the cooling demand, then return to the original set

point. This should be done only once. If the system shuts

down with the same fault, the cause for the fault should be

determined and corrected before the a Cycle-LOC device is

reset again.

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Bryant 569F Manual de usuario Pagina 22

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