Cooling Mode; Continuous Blower Mode; Heat Pump Mode; Start-Up Procedures - Carrier weathermaker 8000 Installation, Start-Up And Operator's Manual

g. Blower off delay—When the thermostat is satisfied, the
circuit between R-W is broken, de-energizing the gas valve
stopping gas flow to the burners. The blower motor and
EAC remain energized 90, 135, 180, or 225 sec (depending
on the blower off-time selection). The furnace is factory set
for a 135-sec blower off delay.
h. Post-purge—The inducer motor remains energized 5 sec
after the burners are extinguished. If jumper is on pin 6 and
pin 9, the post-purge period is 15 sec.

2. Cooling mode

When the thermostat "calls for cooling," R-G and R-Y circuits
close. The R-Y circuit starts the outdoor condensing unit and
the combined R-Y and R-G circuits start the furnace blower
motor on cooling speed. The EAC-1 terminal is energized
with 115v when the blower is operating on cooling speed.
When the thermostat is satisfied, R-G and R-Y circuits are
broken. The furnace blower and EAC continue operating on
cooling speed for an additional 90 sec.

3. Continuous blower mode

NOTE: EAC-1 terminal is energized with 115v whenever blower
operates.
When the R-G circuit is made, the blower motor operates on
heating speed. During a call for heat, the blower stops,
allowing the furnace heat exchangers to heat up more quickly,
then restarts at the end of the 40-sec blower on delay period.
If jumper is on pin 6 and pin 9, the blower on delay is 60 sec.
The blower reverts to continuous operation after the heating
cycle is completed.
When the thermostat "calls for cooling," the blower operates
on cooling speed. When the thermostat is satisfied, the blower
operates an additional 90 sec before reverting back to con-
tinuous operation on heating speed.

4. Heat pump mode

When installed with a heat pump, the furnace control auto-
matically changes the timing sequence to avoid long blower
off time during demand defrost cycles. When the W-Y or
W-Y-G thermostat inputs are received at the same time, the
control changes the blower to heating speed or starts the
blower if it was off, and begins a heating cycle. The blower
remains on until the end of the prepurge period, then shuts off
until the end of the ignition warm-up and trial for ignition
periods (a total of 24 sec). The blower then comes back on at
heating speed.
When the W input signal disappears, the control begins the
normal inducer post-purge period and the blower changes to
cooling speed after a 1-sec delay. If the W-Y-G signals
disappear at the same time, the blower remains on for the
selected heating blower off delay period and the inducer goes
through its normal post-purge period. If the W-Y inputs
should disappear, leaving the G signal input, the control goes
into continuous blower and the inducer remains on for the
normal post-purge period.
Anytime the control senses false flame, the control locks out
of the heating mode. This occurs because the control cannot
sense the W input due to the false flame signal, and as a result,
sees only the Y input and goes into cooling mode, blower off
delay. All other control functions remain in standard format.
NOTE: EAC-1 terminal is energized whenever blower operates.
HUM terminal is only energized when gas valve is energized

START-UP PROCEDURES

1. Purge gas lines—After all connections have been made, purge
the lines and check for leaks.
Never purge a line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. Failure to follow this warning can cause
fire, explosion, personal injury, or death.
2. Component test—The furnace control board allows all com-
ponents, except gas valve, to be run for a short period of time.
This feature helps diagnose a system problem in case of a
component failure. To initiate component test procedure, short
(jumper) the TEST 1/4-in. quick connect terminal on control
board (adjacent to diagnostic light) and the Com terminal on
thermostat connection block for approximately 2 sec. (See Fig.
9.)
NOTE: Component test feature will not operate if any thermostat
signal is present at control board.
Component test sequence is as follows.
a. Momentarily jumper TEST and Com terminals until LED
goes off.
b. LED will display previous fault 4 times.
→
c. Inducer motor starts and continues to run for entire com-
ponent test.
d. Hot surface ignitor is energized for 15 sec, then de-
energized.
e. Blower motor operates on cooling speed for 10 sec, then
stops.
f. Blower motor operates on heating speed for 10 sec, then
stops.
→
g. Inducer motor stops.
3. To operate furnace, follow procedures on operating instruc-
tions label attached to furnace.
4. With furnace operating, set thermostat below room tempera-
ture and observe that furnace goes off. Set thermostat above
room temperature and observe that furnace restarts.
→

ADJUSTMENTS

1. Set gas input rate

Furnace gas input rate on rating plate is for installations at
altitudes up to 2000 ft. Furnace input rate must be within ±2
percent of input on furnace rating plate.
a. Determine natural gas orifice size and manifold pressure
for correct input.
(1.) Obtain average yearly heat value (at installed altitude)
from local gas supplier.
(2.) Obtain average yearly specific gravity from local gas
supplier.
(3.) Verify furnace model. Table 6 can only be used for
model 58WAV Furnaces.
(4.) Find installation altitude in Table 6.
NOTE: For Canada altitudes of 2000 to 4500 ft, use U.S.A.
altitudes of 2001 to 3000 ft in Table 6.
(5.) Find closest natural gas heat value and specific gravity
in Table 6.
(6.) Follow heat value and specific gravity lines to point of
intersection to find orifice size and manifold pressure
settings for proper operation.
11