PVI Industries PV500-44U User Manual

Page 15

PV500-44U 06/12

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. Appliance Btuh output derates 4% per 1000 feet elevation above sea level. Consult Factory for
installations above 2000 feet elevation.

7.1 Gas Train and Controls Certification

NOTE

: The gas train and controls assembly provided on this unit have been tested under the applicable American

National Standard to comply with safety and performance criteria such as proper ignition, combustion and safety
shutdown operation.

7.2 Gas Control Trains

All models include gas control trains with the following components: main manual shutoff valve, two safety shutoff
valves, proportionator regulator and a final manual valve with the manifold pressure tap on the side of the valve.
These components may be separate or two or more may be combined in a common housing.

CAUTION

: Do not adjust or remove any screws or bolts on gas train control components which are sealed

with a red or blue colored compound. Doing so will void all approvals and warranties.

7.3 Inlet

Pressure

Measure at the inlet pressure tap located at the main gas cock. The inlet pressure must remain within the minimum
and maximum values while the unit is at rest and while the unit is operating at maximum firing rate.

7.4 Manifold

Pressure

Measure at the pressure tap located downstream side of the manual valve closest to the burner. The rated manifold
pressure appears on the product data label located near the front of the appliance.

7.5

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.

INLET PRESSURE

NAT. GAS

Maximum Static Pressure (Inches-Water Column)

14"

Minimum Flow Pressure (Inches-Water Column)

4.5"

11"

CONVERT FITTINGS TO EQUIVALENT STRAIGHT PIPE

Diameter Fitting (inches)

¾" 1" 1¼" 1½"

3" 4" 5"

Equivalent Length of Straight Pipe (feet)

2' 2'

10' 14' 20'