Carrier 58GFA - Gas Input and Manifold Adjustments; Setting Gas Input Rate; Adjusting Manifold Pressure

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4. To operate furnace, follow procedures on the lighting instruc-

tions label on the furnace.

5. With furnace operating, set thermostat below room tempera-

ture and observe that the furnace goes off. Set thermostat

above room temperature and observe that the furnace restarts.

ADJUSTMENTS

1. Set gas input rate.

There are 2 methods of adjusting the gas input rate. The

preferred method is by using Table 6 and following instruc-

tions in item a. The second is by clocking the gas meter and

following instructions in item b.

The gas valve regulator has been nominally set at 3.5-in. wc

for natural gas. When adjusting input rate, do not set manifold

pressure above 3.8-in. wc or below 3.2-in. wc.

a. Check gas input rate using Table 6.

(1.) Obtain average yearly heat value for local gas supply.

(2.) Obtain average yearly specific gravity for local gas

supply.

(3.) Verify furnace model. Table 6 can only be used for

model 58GFA Furnaces.

(4.) Check and verify orifice size in furnace. NEVER

ASSUME THE ORIFICE SIZE. ALWAYS CHECK

AND VERIFY.

Table 6—Model 58GFA Orifice Size and Manifold Pressure for Correct Input Rate

(Tabulated Data Based on Altitude Up to 2000 Ft and 21,000 Btuh Per Burner)

GAS HEAT VALUE

(BTU/CU FT)

SPECIFIC GRAVITY OF NATURAL GAS

0.54 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.

Orf

No.

Mnfld

Press.

860

—

3.8

—

3.2

—

3.3

—

3.5

—

3.2

3.6

—

3.3

3.7

—

3.2

3.4

3.8

—

3.3

3.5

—

3.3

3.6

—

3.2

3.4

3.7

875

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.2

3.6

—

3.3

3.7

—

3.4

3.8

—

3.2

3.5

—

3.3

3.6

—

890

—

3.5

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.2

3.5

—

3.3

3.7

—

3.4

3.8

—

3.2

3.5

—

905

—

3.4

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.2

3.5

—

3.3

3.6

—

3.4

3.7

—

920

—

3.3

3.8

—

3.4

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.2

3.5

—

3.3

3.6

—

935

—

3.2

3.7

—

3.3

3.8

—

3.4

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.2

3.5

—

950

—

3.6

—

3.2

3.7

—

3.3

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

965

—

3.4

—

3.6

—

3.2

3.7

—

3.3

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

3.2

—

3.3

—

980

—

3.3

—

3.5

—

3.6

—

3.2

3.7

—

3.4

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

3.2

—

995

—

3.2

—

3.4

—

3.5

—

3.6

—

3.3

3.7

—

3.4

3.8

—

3.5

—

3.6

—

3.7

—

3.8

—

1010

—

3.8

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

3.3

3.7

—

3.4

3.8

—

3.5

—

3.6

—

3.7

—

1025

—

3.7

—

3.2

3.8

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

3.3

3.7

—

3.4

3.8

—

3.5

—

3.6

—

1040

—

3.6

3.8

—

3.7

—

3.2

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

3.3

3.7

—

3.4

3.8

—

3.5

—

1055

—

3.5

3.7

—

3.6

3.8

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

3.3

3.7

—

3.4

3.8

—

1070

—

3.4

3.6

—

3.5

3.7

—

3.7

3.8

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

3.3

3.7

—

1085

—

3.3

3.5

—

3.4

3.6

—

3.6

3.7

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

3.2

3.6

—

1100

3.2

3.4

3.8

—

3.3

3.5

—

3.5

3.6

—

3.6

3.8

—

3.7

—

3.8

—

3.2

—

3.3

—

3.4

—

3.5

—

Carrier 58GFA - Gas Input and Manifold Adjustments; Setting Gas Input Rate; Adjusting Manifold Pressure

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