Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Technical Manual - Manual (Page 16)

16 042-288-B0-001, Rev. A
Federal DOT Regulation 49 CFR Part 192.383, Excess Flow Valve Customer Notifi cation, requires gas
utilities to either voluntarily install Excess Flow Valves (EFVs) on all new home service lines or to notify
builders about EFVs’ benefi ts and availability. EFVs are installed on gas service lines during pre-construction
site work, and automatically activate when a gas line is ruptured. Excess fl ow valves should never be used as
in-line regulators. They cannot perform this function and may damage equipment.
Fig. 1-6, Excess Flow Valve
(above ground ¾" x 4" NPT nipple)
Alpha P/N 042-146-10
1.0 System Overview, continued
1.3 Natural Gas System Block Diagram
For added safety, a low pressure and high pressure excess fl ow valve may be installed.
Do not include the generator system as part of a local gas piping system test. Damage to the
generator pre-regulator may result. The generator system is pressure tested in accordance with
NFPA standards prior to shipment.
Fig. 1-5, Arrangement of Metered, Nominal Pressure (1-2psi) Natural Gas System
NOTE:
ATTENTION:
CAUTION!
S
CONTROL
CONTROLS
ENGINE
Demand
Low-pressure
Regulator
14" WC
(max.)
WC = Water Column H
2
O
Pre-Regulator
Maxitrol 325-3
10 psi max input
Flare Coupling
(Quick-Disconnect)
NOTE: 1 psi = 28" WC
0.5 psi (min.)
1 psi (nominal)
10 psi (max)
Engine must have
7" to 11" WC and 156 cubic
feet/Hr. to operate
Solenoid
APU
Enclosure
Meter
Manual
Shutoff
Low pressure excess
flow valve (optional)
High pressure excess flow valve
(optional)