Bryant 4-WAY MULTIPOISE TWO-STAGE CONDENSING GAS FURNACE 352AAV Instrukcje Operacyjne Pobierz pdf (Strona 53)

b. When the R to G-and Y/Y2 circuit is closed and there

is a demand for dehumidification, the furnace blower

motor BLWM will drop the blower speed from COOL

to HI HEAT for a maximum of 10 minutes before

reverting back to COOL speed. If there is still a

demand for dehumidification after 20 minutes, the

furnace control CPU will drop the blower speed back

to HI HEAT speed. This alternating 10-minute cycle

will continue as long as there is a call for cooling.

c. When the “call for cooling” is satisfied and there is a

demand for dehumidification, the cooling blower-off

delay is decreased from 90 seconds to 5 seconds.

CONTINUOUS BLOWER MODE

When the R to G circuit is closed by the thermostat, the blower

motor BLWM will operate on continuous-blower speed (can be

set to LO HEAT, HI HEAT, or COOL speed). Factory default is

LO HEAT speed. Terminal EAC-1 is energized as long as the

blower motor BLWM is energized.

During a call for heat, the blower BLWM will stop during igniter

warm-up (17 seconds), ignition (7 seconds), and blower-ON

delay (66 seconds), allowing the furnace heat exchangers to heat

up more quickly, then restarts at the end of the blower-ON delay

period at LO HEAT or HI HEAT speed respectively.

In high-heat, the furnace control CPU will hold the blower motor

BLWM at HI HEAT speed during the selected blower-OFF delay

period before reverting to continuous-blower speed.

When the thermostat “calls for low-cooling”, the blower motor

BLWM will switch to operate at low-cool speed (same speed as

LO HEAT). When the thermostat is satisfied, the blower motor

BLWM will operate an additional 90 seconds on low-cool speed

before reverting back to continuous-blower speed.

When the thermostat “calls for high-cooling”, the blower motor

BLWM will operate at COOL speed. When the thermostat is

satisfied, the blower motor BLWM will operate an additional 90

seconds on COOL speed before reverting back to

continuous-blower speed.

When the R to G circuit is opened, the blower motor BLWM will

continue operating for an additional 5 seconds, if no other

function requires blower motor BLWM operation.

Continuous Blower Speed Selection from Thermostat -- T o

select different continuous-blower speeds from the room

thermostat, momentarily turn off the FAN switch or push-button

on the room thermostat for 1 -- 3 seconds after the blower motor

BLWM is operating. The furnace control CPU will shift the

continuous- blower speed from the factory setting of LO HEAT to

HI HEAT speed. Momentarily turning off the FAN switch again

at the thermostat will shift the continuous-blower speed from HI

HEAT to COOL. Repeating the procedure will shift the

continuous-blower speed from COOL to LO HEAT speed. The

selection can be changed as many times as desired and is stored

in the memory to be automatically used following a power

interruption.

HEAT PUMP

(See Fig. 50 C--F for thermostat connections)

When installed with a heat pump, the furnace control

automatically changes the timing sequence to avoid long blower

off times during demand defrost cycles. When the R to

W/W1-and-Y1 or R to W/W1-and-Y1-and-G circuits are

energized, the furnace control CPU will switch to or turn on the

blower motor BLWM at low cool speed (same speed as LO

HEAT), and begin a low-heat cycle. The blower motor BLWM

will remain on until the end of the prepurge period, then shut off

for 24 seconds then come back on at LO HEAT speed. When the

W/W1 input signal disappears, the furnace control begins a

normal inducer post-purge period and the blower remains running

at LO HEAT speed. If the R-to-W/W1-and-Y1-and-G signals

disappear at the same time, the blower motor BLWM will remain

on for the selected blower-OFF delay period. If the R-to

W/W1-and-Y1 signals disappear, leaving the G signal, the blower

motor BLWM will remain on for the selected blower-OFF

delay period then switch to continuous-blower speed.

When the R-to W/W1-and-Y/Y2, R-to-W/W1-and-

Y/Y2-and-G, R-to W/W1-and-Y1-and-Y/Y2, or R-to-W/W1-

and-Y1-and- Y/Y2-and-G circuits are energized the furnace

control CPU will switch to or turn on the blower motor BLWM

at COOL speed, and begin a high-heat cycle. The blower motor

BLWM will remain on until the end of the prepurge period,

then shut off for 24 seconds then come back on at HI HEAT

speed. When the W/W1 input signal disappears, the furnace

control begins a normal inducer post-purge period and the

blower switches to COOL speed after a 3 second delay. If the

R-to-W/W1-and-Y/Y2-and-G or R-to W/W1-and-Y1-and-

Y/Y2-and-G signals disappear at the same time, the blower

motor BLWM will remain on for the selected blower-OFF

delay period. If the R-to W/W1-and-Y/Y2 or

R-to-W/W1-and-Y1-and-Y/Y2 signals disappear, leaving the G

signal, the blower motor BLWM will remain on for the selected

blower- OFF delay period then switch to continuous-

blower speed.

COMPONENT SELF-TEST

NOTE: The furnace control component test allows all

components to run for a short time; except the gas valve and

humidifier terminal HUM are not energized for safety reasons.

The EAC-1 terminal is energized when blower is energized. This

feature helps diagnose a system problem in case of a component

failure. The component test feature will not operate if any

thermostat signal is present at control and not until all time delays

are completed.

To Begin Component Self-Test:

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in electrical shock,

personal injury, or death.

Blower access panel door switch opens 115-v power to control

board. No component operation can occur. Caution must be

taken when manually closing this switch for service purposes.

WARNING

1. Remove blower access door.

2. Disconnect thermostat R lead from furnace control.

3. Manually close blower door switch.

4. For approximately 2 sec, short (jumper) the C

OM-24v

terminal on control to the TEST/TWIN 3/16-in. (5 mm)

quick- connect terminal on control until LED turns off.

Remove jumper from terminals. (See Fig. 37.)

NOTE: If TEST/TWIN and C

OM-24v terminals are jumpered

longer than 2 sec, LED will flash rapidly and ignore component

test request.

Component test sequence for 2-stage furnace is as follows:

a. LED will display previous status code 4 times.

b. Inducer motor starts on high-speed and continues to

run until Step g of component test sequence.

c. Hot surface igniter is energized for 15 sec, then off.

d. Blower motor operates on LO-HEAT speed for 10 sec.

e. Blower motor operates on HI-HEAT speed for 10 sec.

f. Blower motor operates on COOL speed for 10 sec.

g. Inducer motor goes to low-speed for 10 sec, then stops.

5. Reconnect R lead to furnace control, remove tape from

blower door switch, and re-install blower door.

352AAV

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