Reznor R6GI Unit Installation Manual Manual de usuario descargar pdf (Pagina 20)

11. The inducer motor is de-energized after a 30 second

post purge.

12. The circulating air blower will remain energized for

approximately 120 - 150 seconds after the demand

for heat is no longer present.

13. Abnormal Conditions - If a limit switch opens during

heating operation the gas valve is de-energized

immediately. The control de-energizes the induced draft

motor and runs the indoor blower motor continuously

while the limit switch is open.

Cooling Mode

Before the ﬁrst start after power-up and between cycles

there will always be a 5 minute (re)start delay imposed.

With a call for cooling and before the compressor is turned

on, the outdoor fan will run for 1 minute to assure that

the outdoor temperature measurement is close to that of

the ambient air. The compressor will then ramp up to a

speed selected by the capacity control scheme.

The unit is a true variable speed unit. Normally the

compressor will operate at one of 5 speeds in cooling,

each predetermined for a balance of optimum efﬁciency

and capacity.The outdoor fan motor and indoor blower will

also operate at multiple speeds, following the compressor.

For cooling mode, the speeds used will depend on several

factors,including:

• Whetherrstorsecondstageoperationiscalledforby

the thermostat (which must be two stage-capable),

• Outdoorambienttemperature.

• Thelengthoftimetheequipmenthasbeenoperating

during the current cycle

• Theoperatingspeedhistory,forboththecurrentand

the previous operating cycles.

For example, with a ﬁrst stage call in cooling, if the setpoint

was satisﬁed quickly, the unit will restart the next time

at a lower speed. At a low or intermediate speed, if the

setpoint is not satisﬁed within 60 minutes, the speed will

be increased. If the unit cycles off after having a speed

increase, the entire next cycle will be at the higher speed.

Also, the outdoor fan will run for an extra minute after the

compressor shuts off.

The actual current operating compressor speed can be

determined by checking the 2-character display on the

interface board. Refer to Figure 14 (page 31), Figure

15 (page 32), and Table 17, (page 31).

The blower speeds for the various cooling stages

are programmed and controlled in accordance with

compressor speeds. It is possible to adjust blower airﬂow

if required by application, in which case the controller will

adjust all speeds according to the adjusted nominal speed.

The airﬂow is set by DIP switches on the blower control

board, providing one ﬂow for second stage compressor

speeds and a lower ﬂow for ﬁrst stage compressor speeds.

De-Humidiﬁcation Control

If installing a humidistat, install it in the return air duct

as directed in the installation instructions included in the

accessory kit. Run the humidistat wiring through the low-

voltage wire entrance in the packaged unit and connect

one side of the humidistat to the R terminal of the low

voltage ﬁeld connection board & the other side to the

DEHUM terminal located on the blower control board.

Wire the humidistat to close on rise in humidity.

For dehumidiﬁcation, the Dehum input on the VSHE board

can be used to control this function. If the Dehum input is

active and the unit is operating in second stage cooling,

the following will happen. The suction line temperature

sensor is used for coil temperature.

• TheblowerCFMis75%ofcoolingvaluefortheoperating

speed.

• Ifcoiltemperatureislessthan37

F for 30 seconds,

then blower CFM is set to 85% of cooling value. If coil

temperature rises above 37

F for 5 minutes, then blower

runs at 75% of cooling value.

• Ifcoiltemperatureislessthan35

F for 30 seconds,

then blower CFM is set to 100% of cooling value. If

coil temperature rises to between 35

and 37

F for 5

minutes, then blower CFM is set to 85% of cooling value.

If coil temperature rises above 37

F for 5 minutes, then

blower CFM is set to 75% of cooling value.

Delay Override

When performing startup tests or troubleshooting, the 5

minutes startup delay can be skipped by shorting the two

J4 Test pins indicated in Figure 14 for about 1 second

while the compressor is off and waiting to start.

NOTE: This will also clear the faults stored in memory.

Fan Only Mode

1. On a call for fan only operation, the thermostat applies

24 VAC to the G terminal on the furnace control board.

2. The circulating air blower ramps to 1/2 of the selected

airﬂow.

EQUIPMENT MAINTENANCE

WARNING:

ELECTRICAL SHOCK, FIRE OR

EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycould

result in serious injury or property damage.

Improper servicing could result in dangerous

operation, serious injury, death or property

damage.

• Beforeservicing,disconnectallelectrical

powertofurnace.

• When servicing controls, label all wires

prior to disconnecting. Reconnect wires

correctly.

• Verifyproperoperationafterservicing.

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