Bryant 373LAV - Set temperature rise

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2. Set temperature rise.

Furnace must operate within range of temperature rise

specified on the unit rating plate. Determine the air tem-

perature rise as follows.

a. Place duct thermometers in return and supply ducts as

near furnace as possible. Be sure thermometers do not

"see" heat exchangers so that radiant heat does not affect

thermometer readings. This is particularly important

with straight-run ducts.

b. When thermometer readings stabilize, subtract return-air

temperature from supply-air temperature to determine

temperature rise.

c. Adjust air temperature rise by adjusting blower speed.

Increase blower speed to reduce temperature rise. De-

crease blower speed to increase temperature rise.

WARNING: Disconnect the electrical power before

changing the speed tap. Failure to follow this warning

could result in personal injury.

d. To change blower motor speed selections for heating

mode remove blower motor lead from control board

HEAT terminal. (See Fig. 11.) Select desired blower

TABLE 7—MODEL 373LAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT RATE*

(TABULATED DATA BASED ON ALTITUDE UP TO 2000 FT AND 23,000 BTUH PER BURNER)

GAS HEAT VALUE

(BTU/CU FT)

SPECIFIC GRAVITY OF NATURAL GAS

0.56 0.58 0.60 0.62 0.64 0.66 0.68 0.70 0.72

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

Orf

No.

Mnfld

Press.

860

—

3.2

3.5

—

3.3

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

3.7

3.2

3.4

3.8

3.3

3.5

—

3.4

3.6

3.2

3.5

3.8

—

3.2

3.6

—

875

—

3.3

3.7

—

3.2

3.5

—

3.3

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

3.6

3.2

3.4

3.8

3.3

3.5

—

3.4

3.6

—

3.4

3.7

890

—

3.2

3.6

—

3.4

3.7

—

3.2

3.5

—

3.3

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

—

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

3.6

905

—

3.5

—

3.2

3.6

—

3.4

3.7

—

3.2

3.5

—

3.3

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

—

3.6

—

3.4

3.7

3.2

3.5

920

—

3.4

—

3.5

—

3.2

3.6

—

3.4

3.7

3.2

3.5

3.8

—

3.3

3.6

—

3.4

3.7

3.2

3.5

3.8

3.3

—

3.6

—

3.4

935

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

—

3.7

—

3.4

3.8

3.2

3.5

—

3.3

3.6

3.2

3.4

3.7

3.3

3.5

3.8

950

—

3.2

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

—

3.7

—

3.3

3.8

3.2

3.5

—

3.3

3.6

3.2

3.4

3.7

965

—

3.7

—

3.2

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

—

3.7

—

3.3

3.8

3.2

3.4

—

3.3

3.5

980

—

3.6

—

3.7

—

3.2

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

—

3.7

—

3.3

3.8

3.2

3.4

995

—

3.5

—

3.6

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

—

3.7

—

3.3

1010

—

3.4

—

3.5

—

3.6

—

3.6

—

3.2

—

3.3

—

3.4

—

3.5

—

3.6

—

3.2

1025

—

3.3

3.8

—

3.4

—

3.5

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

1035

—

3.2

3.7

—

3.3

3.8

—

3.4

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

1055

—

3.6

—

3.2

3.7

—

3.3

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

1070

—

3.5

—

3.6

—

3.3

3.7

—

3.4

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

3.2

—

1085

—

3.4

—

3.5

3.2

3.6

3.3

3.7

—

3.4

—

3.5

—

3.6

—

3.7

—

3.8

—

1100

—

3.3

—

3.4

—

3.5

3.2

3.6

3.3

3.7

—

3.4

—

3.5

—

3.6

—

3.7

—

*For size 060135 only, deduct 0.1-in. wc from manifold pressure shown in table due to 22,500 Btuh per burner input. If resultant manifold pressure falls below 3.2-in. wc,

change orifice size.

—13—

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