Honeywell V8944B Benutzerhandbuch

65-0214—08

4

1. Check the burner nameplate for:

a. the type of gas used, and 

b. the gas flow capacity. The capacity will be listed in 

British thermal units per hour (Btuh) or in cubic feet 

per hour (cfh).

2. Contact the local gas utility for information regarding:

a. the specific gravity (sp gr) and 

b. the Btu per cubic foot (Btucf) for the type of gas used.

3. Find the capacity in cf/h. If the capacity is listed in Btu, 

convert to cf/h using the following formula:

         

4. For gases with specific gravities other than 0.64, multiply 

the burner cf/h using the proper conversion factor in 

Table 4.

5. Use the corrected burner capacity in cfh when determin-

ing the gas valve size in Figs. 2–9.

6. Determine the maximum pressure drop across the valve 

and draw a vertical line at this pressure in Figs. 2–9.

7. At the point of intersection of the vertical line and the 

curve, draw a horizontal line to intersect the flow 

(capacity) scale. The point of intersection indicates the 

capacity that can be obtained with the maximum 

pressure drop. 

8. If the capacity at the maximum pressure drop is 

insufficient, use the capacity vs. pressure drop curve for 

the next larger valve size and repeat steps 6 and 7.

6-9/16 (167)

FOR 1, 1-1/4

OR

7-3/8 (187)

FOR 1-1/2, 2

6 (152)

6 

(152)

M23375

ATMOSPHERIC

PRESSURE 

REFERENCE 

PORT WITH 

INTERNAL 

VENT LIMITER

OUTLET 

PRESSURE

TAP

INLET 

PRESSURE

TAP

PRESSURE

REGULATOR

ADJUSTMENT

CAPS

Capacity in cfh = Btuh (burner nameplate)

Btu/cf (gas utility)

Manufactured

0.60

0.968

Mixed

0.70

1.046

LP-Propane

1.53

1.546

LP-Butane

1.98

1.759

M23376

0.1

1

10

100

FLOW NATURAL GAS (CFH)

PRESSURE DROP (IN. WC)

100

1000

10000