Carrier WEATHERMAKER 8000 58WAV Instruções de Operação descarregar pdf (Página 15)

When the R to G and Y1 circuit open, the furnace blower

continues operating on FAN speed for an additional 90 sec.

To set the cooling off-delay to 3 sec instead of 90, connect

a jumper between the Y1 and DHUM thermostat connects

on the furnace control.

c. Two-Speed Outdoor Unit with Thermidistat-See Figure 11

and 13.

The dehumidification output, DHUM, on the Thermidistat

should be connected to the furnace control thermostat

terminal DHUM. When there is a dehumidify demand, the

DHUM input is activated, which means 24 vac signal is

removed from the DHUM input terminal. In other words,

the DHUM input logic is reversed. The DHUM input is

turned ON when no dehumidify demand exists and is

turned OFF when demand exists. Once 24 vac is detected

by the furnace control on the DHUM input, the control

operates in Thermidistat mode.

The thermostat closes the R to G and Y1 circuits for low

cooling and the R to G, Y1 and Y/Y2 circuits for high

cooling. The R to Y1 circuit starts the outdoor unit on low

cooling and the R to G and Y1 circuits start the furnace

blower on FAN speed. The R to Y1 and Y2 circuits start the

outdoor unit on high cooling and the R to G, Y1 and Y2

circuits start the furnace blower in COOL speed. If the R to

Y2 circuit opens with the R to G and Y1 circuits still

closed, the outdoor unit will drop to low cooling and the

furnace control will drop the blower speed to FAN. When

the thermostat is satisfied, the R to G and Y1 circuits are

opened. The outdoor unit stops. When there is a dehu-

midify demand, the cooling blower off-delay is decreased

from 90 to 3 sec.

In Two-Speed Cooling with only the R to G and Y1 circuits

closed and there is a demand for dehumidification, the

furnace control blower will remain at FAN speed. In high

cooling with a demand for dehumidification, the furnace

control will drop the blower speed from COOL to 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 control will drop the blower speed

back to HEAT speed. This alternating 10-minute cycle will

continue as long as there is a call for cooling. If the DHUM

input is low for more than 48 hours, the control reverts back

to non-Thermidistat operation.

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

FAN 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 45-sec blower on delay period at

HEAT speed. If jumper is across PL7-6 AND PL7-9, the

blower on delay is 66 sec.

The blower reverts back to FAN speed after the heating

blower OFF delay is completed.

When the thermostat "calls for cooling," the blower operates

on COOL speed. When the thermostat is satisfied, the blower

operates an additional 90 sec before reverting back to con-

tinuous operation on FAN speed.

4. Continuous blower speed selection from thermostat

To select different continuous blower speeds from the room

thermostat, momemtarily turn off the FAN switch or pushbut-

ton on the room thermostat for 1-3 sec after the blower is

operating. The control will shift the blower speed from factory

setting of FAN to HEAT speed. Momentarily turning off the

FAN switch again at the thermostat will shift the continuous

blower speed selection from HEAT to COOL. Repeating the

procedure will cause the control to shift from COOL to FAN

speed. The selection can be changed as many times as desired

and is stored in the memory to be automatically used follow-

ing a power interruption.

5. 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-Y1,

W-Y/Y2, W-Y1-G, or W-Y/Y2-G thermostat inputs are re-

ceived at the same time, the control changes the blower to

HEAT 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 HEAT speed.

When the W input signal disappears, the control begins the

normal inducer post-purge period and the blower changes to

COOL speed after a 1-sec delay. If the W-Y/Y2-G or W-Y1-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-Y1 or

W-Y/Y2 inputs should disappear, leaving the G signal input,

the blower remains on at HEAT speed for the selected blower

off-delay period and the inducer remains on for the normal

post-purge period. After the blower off-delay is completed the

control switches the blower to FAN speed.

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/Y2 and/or Y1 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 3/16-in. quick connect terminal on control

(behind the Y/Y2 terminal) and the C

OM-24V terminal on

furnace thermostat connection block for approximately 2 sec.

(See Fig. 15.)

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 C

OM-24V terminals until

LED goes off.

b. LED will display previous status code 4 times.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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Carrier WEATHERMAKER 8000 58WAV Instruções de Operação Página 15

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