Bryant 4-WAY MULTIPOISE 359AAV User Manual download pdf (Page 42)

will lower the temperature rise. A lower blower speed will

increase the temperature rise.

Changing Blower Speed

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or

death.

Turn OFF power to furnace before changing speed taps.

WARNING

NOTE: The speed taps that the manufacturer sets from the

factory for this product are based on a nominal 400 CFM per ton

cooling and the basic mid range on the temperature rise for

heating.

Since the manufacturer cannot establish the static pressure

that will be applied to the unit, it is the responsibility of the

installer dealer/contractor to select the proper speed taps for

the application when the unit is installed.

If it is necessary to change speeds, refer to steps below.

REDUCED FURNACE LIFE HAZARD

Failure to follow this caution may result in reduced furnace

life.

Use ONLY the blower motor speed taps insert indicated in

the Circulation Air Blower Data for setting air temperature

rise.

CAUTION

Table 8 – Blower Speed Chart

Wire Color Motor Speed

Black High

Orange* M e d --- H i g h

Blue Medium

Red Low

* Med---High speed may not be provided on all models.

1. Refer to Furnace Wiring Diagram for location of the heat-

ing and cooling speed taps located on the furnace control

as well as location of unused blower motor speed leads.

Use the chart (Table 8) to determine the blower motor

speed settings.

2. Change the heat or cool blower motor speed by removing

the motor lead from the “Heat”or“Cool” terminal and

replace it with the desired motor speed lead from the

“Unused Motor Lead” location. Connect the wire previ-

ously removed from the “Heat”or“Cool” terminal to the

vacated “Unused Motor Lead” terminal.

3. If the same speed must be used for both heating and cool-

ing, remove the undesired motor speed lead from the

“Heat”or“Cool” terminal and connect that lead to the

open terminal at “Unused Motor Lead” location. Attach a

jumper between the “Heat”and“Cool” terminals and the

remaining motor speed lead.

NOTE: For motors with (4) speed leads, it will be necessary to

tape off the terminal of the motor speed lead removed from the

“Heat”or“Cool” terminal with electrical tape since an open

terminal will not be available at the “Unused Motor Lead”

location.

Continuous- Fan Operation using “G”

Energizing the “G” terminal on the furnace control provides

continuous fan operation. This is done by connecting the G

terminal of the thermostat to the G terminal on the furnace

control. When the FAN switch is turned from auto to ON the fan

will operate continuously at “HEAT” speed. EAC will be

energized in this mode.

NOTE: In heating, the fan will turn off during furnace ignition

and warm up then restart at heating speed.

Hard Wired Continuous Fan Operation

A terminal is provided on the furnace control board located in the

circulating blower compartment for operation of the continuous

fan option. This connection is intended for the low speed motor

tap, and has a lower contact rating (8 amps) than the heat and

cool taps. When the low speed blower lead is connected to this

terminal, this will provide low speed blower operation whenever

the other two speeds (Heat or Cool) are not energized.

Thoroughly check the system after modification to ensure the

proper operation of the circulating air blower in all modes of

operation.

Separate Speed Selections for Heat, Cool,

and Continuous Fan

Connect low speed lead from circulating motor to the “Cont.”

terminal at the furnace control. The appropriate motor leads

should already be connected to the “Heat”and“Cool” terminals.

Heating and Continuous Blower Speed the

Same

If it is necessary to operate the heating speed and continuous

blower speed using the same blower speed, connect a jumper

between the “Heat”and“Cont.” terminals on the furnace

control.

NOTE: There should be only ONE motor lead going to the

“Heat”and“Cont.” terminals.

FURNACE MAINTENANCE

FIRE, EXPLOSION, OR CARBON MONOXIDE

HAZARDS

Failure to follow this warning could result in personal injury,

death and/or property damage.

It is recommended that the furnace be inspected and serviced

on an annual basis (before the heating season) by a qualified

service technician.

WARNING

ELECTRICAL SHOCK, FIRE OR EXPLOSION

HAZARD

Failure to follow this warning could result in personal injury,

death, and/or property damage.

Before servicing, disconnect all electrical power to furnace.

Lockout and tag with appropriate label.

When servicing controls, label all wires prior to disconnecting.

Reconnect wires correctly.

Verify proper operation after servicing.

WARNING

359AAV

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Bryant 4-WAY MULTIPOISE 359AAV User Manual Page 42

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