Bryant TSTATBBN2S01-C Manual de Instalação descarregar pdf (Página 21)

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Diagnostic Features

The Status LED on the CXM control advises the

serviceman of the current status of the CXM control. The

status LED can display either the current CXM mode or

the last fault memory if in test mode. See Table 7 for a

complete listing of codes.

Unit Operation Description

PowerUp - The unit will not operate until all the inputs

and safety controls are checked for normal conditions.

Note: The compressor will have a 5 minute anti-short

cycle delay at power-up.

Standby - In Standby mode, Y and W inputs are not

active. Inputs O and G may be active. Compressor will

be off.

Cooling - To enter Cooling mode, Y and O become active. The

ﬁ rst time after power-up that there is a call for compressor,

the compressor will follow a 5 to 80 second random start

delay. There will also be a 5 min compressor anti-short cycle

protection time as well. After the random start delay, the

compressor relay is energized. On all subsequent compressor

calls, the random start delay is omitted.

Heating Stage 1 - To enter Heating Stage 1 mode, Y

becomes active. The ﬁ rst time after power-up that there

is a call for compressor, the compressor will follow a 5 to

80 second random start delay. There will also be a 5 min

compressor anti-short cycle protection time as well. After

the random start delay, the compressor relay is energized.

On all subsequent compressor calls, the random start

delay is omitted.

Heating Stage 2 - To enter Heating Stage 2 mode, W

becomes active (Y already active). The Compressor

relay remains on. EH1 is turned on immediately. With

continuing Heating Stage 2 demand, EH2 will turn on

after 10 minutes. The EH2 will not turn on in heating (or

will turn off if already on) if loop temperature is above

approximately 50°F (FP1 >45°F).

Emergency Heat - In Emergency Heat mode, W

becomes active while Y is not active. EH1 is turned on

immediately. With continuing Emergency Heat demand,

EH2 will turn on after 5 minutes. The FP1 and FP2

temperatures do not effect emergency heat operation.

Table 8. Fault Description Table

ICM2 Control Board

The GT-X also employs an ICM2 board that features:

• Thermostat terminal connections

• Thermostat signal diagnostic LED's

• Airﬂ ow selection

• Airﬂ ow LED (100 cfm per ﬂ ash)

• Dehumidiﬁ cation Mode Jumper

Fault

Fault LED

Code

Fault Condition

High Pressure Switch 2 HP Open Instantly

Low Pressure Switch or LOC 3

LP open for 30 continuous seconds before or

during a call (bypassed for first 60 seconds)

Freeze Protection Coax - FP1 4

FP1 below Temp limit for 30 continous seconds

(bypassed for first 60 seconds of operation)

Freeze Protection Air Coil - FP2 5

FP2 below Temp limit for 30 continous seconds

(bypassed for first 60 seconds of operation)

Condensate overflow 6

Sense overflow (grounded) for 30 continous

seconds

Over/Under Voltage Shutdown 7 (Autoreset) "R" power supply is <19VAC or >30VAC

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 31 32

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