Gas Pressure; Gas Valve Replacement - Lochinvar POWER-FIN PBN2500 Installation & Operation Manual

6
Gas connections
Table 6B Natural Gas Pipe Size Chart
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour
Pipe
Size
10 20
(Inches)
2 3,050 2,090
2 1/2 4,860 3,340
3 8,580 5,900
4 17,500 12,000

Gas Pressure

The gas pressure must remain between 4 inches w.c. (.99 kPa)
minimum and 14 inches w.c. (3.5 kPa)maximum for Natural
gas and between 8 inches w.c. (2.0 kPa) minimum and 14
inches w.c. (3.5 kPa) maximum for LP gas during standby
(static) mode and while in operating (dynamic) mode. If an
in-line regulator is used, it must be a minimum of 10 feet (3
m) from the Power-fin boiler. It is very important that the gas
line is properly purged by the gas supplier or utility company.
Failure to properly purge the lines or improper line sizing, will
result in ignition failure.
Ignition problems are especially noticeable in NEW LP
installations and also in empty tank situations. This can also
occur when a utility company shuts off service to an area to
provide maintenance to their lines.
(continued)
TABLE - 6B
(based on .60 specific gravity, 0.30" w.c. pressure drop)
Length of Pipe in Straight Feet
30 40 50 60
1,680 1,440 1,280 1,160
2,680 2,290 2,030 1,840
4,740 4,050 3,590 3,260
9,660 8,270 7,330 6,640
Installation & Operation Manual
70 80 90 100
1,060 989 928 877
1,690 1,580 1,480 1,400
3,000 2,790 2,610 2,470
6,110 5,680 5,330 5,040

Gas valve replacement

The gas valve MUST NOT be replaced with a conventional gas
valve under any circumstances. As an additional safety feature,
the gas valves have flanged connections to the venturis and
blowers.
Failure to follow all precautions could result
WARNING
in fire, explosion, or death!
DO NOT adjust or attempt to measure gas
WARNING
valve outlet pressure. Attempting to alter
or measure the gas valve outlet pressure
could result in damage to the valve causing
potential severe personal injury, death, or
substantial property damage.
125 150 175 200
777 704 648 602
1,240 1,120 1,030 960
2,190 1,980 1,820 1,700
4,460 4,050 3,720 3,460
37