PVI Industries PV500-12 User Manual

Page 13

TURBOPOWER 99



WATER HEATER

PV500-12 08/12

GAS SUPPLY AND PIPING

Verify that the type of gas specified on rating plate is supplied to the unit. This unit is orificed for operation up to
2000 feet altitude. The appliance Btu/h output, like other similar equipment, derates approximately 4% per 1000
feet above sea level. Consult Factory for installations above 2000 feet elevation.

9.1 Inlet

Pressure:

Measured at the inlet pressure tap located at the main gas cock. The inlet pressure must remain

within the minimum flow pressure and maximum static pressure charted below while the unit is at rest and while
the unit is operating at maximum firing rate.

Water Heater

Prefix

Min Inlet Flow Pressure

(in. W.C.)

Max Static Pressure

(in. W.C.)

742

5.0" Nat. Gas

14" Nat. Gas

1485

5.5" Nat. Gas

14" Nat. Gas

2228

6.0" Nat. Gas

14" Nat. Gas

2971

11.0" Nat. Gas

14" Nat. Gas

9.2 Manifold

Pressure:

Measure at the pressure tap on the downstream side of the final manual shutoff valve for

each stage of operation. The rated manifold pressure appears on the data label. The manifold pressure is preset
at the factory and adjustment is not usually required. If adjustment is required, the burner must be firing at the
minimum and/or full rate while the manifold pressure is adjusted.

9.3 Gas

Piping

Size:

Use the values in “Convert Fittings To Equivalent Straight Pipe” to add the equivalent straight pipe

for each elbow or tee to obtain the total distance from the meter. Use this corrected total distance from the meter for
determining the suggested pipe size in the “Single Unit Installation Suggested Gas Pipe Size” table.

**Multiplier for alternate pressure drops: 0.3" W.C. 0.77; 1.0" W.C. 1.41; 2.0" W.C. 2.00; and 4.0" W.C. 2.82.

CONVERT FITTINGS TO EQUIVALENT STRAIGHT PIPE

Fitting Size (inches)

¾"

1" 1¼" 1½"

Equivalent Length of

Straight Pipe (feet)

2' 2' 3' 4' 5' 10' 14'

20'

Equivalent Feet

From Meter

SINGLE UNIT INSTALLATION SUGGESTED PIPE SIZE

Maximum Capacity for Natural Gas*

MBTU/HR Based on 0.5" W.C. Pressure Drop*

1-1/4"

1-1/2" 2" 2½" 3" 4"

860 1320 2475 3900 7000

40 660

990

1900

3000

5300

60 -

810

1520

2400

4300

80 -

690

1300

2050

3700

100

620 1150 1850 3250 6700

125

1020 1650 2950 6000

150 -

950

1500

2650

5500

175 -

850

1370

2450

5000

200 -

800

1280

2280

4600