Lennox International Inc CBWMV, AIR HANDLERS Jumper Settings, Factory Blower Speed Tap Settings

Jumper Settings

IMPORTANT

Before changing jumper setting, make sure the mo- tor has completely stopped. Any jumper setting change will not take place while the motor is run- ning.

Table 4 shows the factory blower speed tap settings for CBWMV series units. These settings are for nominal ton- nage match−ups with the CBWMV. When matched with other sizes, it is recommended that the CFM be adjusted approximately to 400 CFM per ton.

Table 4

Factory Blower Speed Tap Settings

CBWMV		Speed Tap Selection
Blower
	Cool Pin	Heat Pin	Adjust	Delay
Coil
−24B−040	1	2	NORM	4
−36B−070	3	4	NORM	4
−36C−090	3	4	NORM	4
−60C−100	4	4	NORM	4
−60C−120	4	4	NORM	4

To change jumper positions, gently pull the jumper off the pins and place it on the desired set of pins. The following section outlines the different jumper selections available and conditions associated with each one. Refer to figure 14.

After the CFM for each application has been determined, the jumper settings must be adjusted to reflect those given in tables 5 through 9. From the tables, determine which row of CFM volumes most closely matches the desired CFM. Once a specific row has been chosen (+, NORMAL, or −), CFM volumes from other rows cannot be used. Below are descriptions of the jumper selections.

ADJUST Pins The ADJUST pins allow the motor to run at normal speed, approximately 10% higher, or approxi- mately 10% lower than normal speed. Tables 5 through 9 gives three rows (+, NORMAL, and −) with their respective CFM volumes. Notice that the normal adjustment setting for heat speed position #3 is 1070 CFM. The + adjustment setting for that position is 1180 CFM and for the − adjust- ment setting is 940 CFM. After the adjustment setting has been determined, chose the remainder speed jumper set- tings from those offered in the table in that row.

The TEST pin is available to bypass the BDC3 control and run the motor at approximately 70% to test that the motor is operational. This is beneficial primarily in troubleshooting. G must be energized for motor to run.

COOL Pins The COOL jumper is used to determine the CFM during either 1) cooling or 2) heat pump operation without a W1 call for electric heat. These jumper selections are activated for cooling when Y1 and/or Y2 and DS termi- nals in the CBWMV unit are energized and for heating when Y1 and/or Y2 is energized.

For applications with the Harmony® Zoning System, the blower CFM volume is determined by the Harmony control center. The minimum blower speed is predetermined at 400 CFM for −CBWMV−24B−040 and 36B−070 series units and 600 CFM for CBWMV−36C−090, 60C−100, and 60C−120 series units. This speed is not adjustable.

With the thermostat set for

call for heating or cooling, the CBWMV will provide 38% of the COOL CFM selected.

HEAT Pins The HEAT jumper is used to determine CFM heating. These jumper selections are activated only when W1 is energized. (There is a fixed 45 seconds ON and 30 seconds OFF delay on a W call.)

DELAY Pins The DELAY jumper is used to set the spe- cific motor fan operation during cooling mode. Depending on the application, one of four options may be chosen by moving the jumper to the appropriate set of pins.

#1 Pins Jumpered

AMotor runs at 100% until demand is satisfied.

AB

OFF OFF

BOnce demand is met, motor ramps down to stop.

#2 Pins Jumpered

AMotor runs at 100% until demand is satisfied.

A	B	C
OFF		OFF

BOnce demand is met, motor runs at 100% for 45 seconds. Then,

Cramps down to stop.

NOTE − Blower OFF DELAY also applies during heat pump operation

#3 Pins Jumpered

AMotor runs at 82% for approximately 7−1/2 min- utes. If demand has not been satisfied after 7−1/2 minutes,

Bmotor runs at 100% until demand is satisfied.

A	B	C
OFF		OFF

COnce demand is met, motor ramps down to stop.

#4 Pins Jumpered

AMotor runs at 50% for 30 seconds.

BMotor then runs at 82% for approximately 7−1/2 minutes. If demand has not been satisfied after 7−1/2 minutes.

CMotor runs at 100% until demand is satisfied.

DOnce demand is met, motor runs at 50% for 30 seconds. Then,

A B	C	D
		E
OFF		OFF

Eramps down to stop.

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CBWMV SERIES