Types 749B and R130
2
Specifications
The Specifications table lists the specifications for the regulators. Contact the factory if the regulators are to be used on
any sevice other than LP-Gas, natural gas, or air.
Introduction
Scope of the Manual
The Instruction Manual covers installation and
maintenance for the Types 749B, R130 changeover
manifolds and the Types 64SR/122 and HSRL-749B
commercial automatic changeover regulators.
Description
Changeover Manifold Assemblies
Type R130/21
—Composed of two Type 67C
regulators and a special 0 to 60 psig / 0 to 4.1 bar
pressure gauge, the Type R130/21 delivers a 45 psig /
3.1 bar outlet pressure on supply and 30 psig /
2.1 bar on reserve. The gauge, which serves as the
changeover indicator, is painted red from 0 to 35 psig /
0 to 2.4 bar. When the dial reads in the 0 to 35 psig /
0 to 2.4 bar range, it indicates that the manifold has
switched from the supply to the reserve cylinder.
Type 749B/21
—Large capacity changeover manifold
for commercial and industrial applications. It consists of
two Type 64 regulators and a Type 803 direct indicator.
The assembly is used primarily in conjunction with
either a Type HSRL or 64SR regulator. The standard
outlet setting is 15 psig / 1.0 bar (supply) and 5 psig /
0.34 bar (reserve).
CAPACITY BTU/HR.
PROPANE
TYPE
INLET
CONNECTIONS
OUTLET
CONNCETIONS
OUTLET PRESSURE SETTING
Supply Setting
Reserve Setting
1,475,000
(1)
R130/21
1/4-inch FNPT
1/4-inch FNPT
45 psig
3.1 bar
30 psig
2.1 bar
1,500,000
(1)
749B/21
1/2-inch FNPT
1/2-inch FNPT
15 psig
1.0 bar
5 psig
0.35 bar
1. Based on 100 psig / 6.9 bar inlet, reserve setting.
Changeover Manifold Assemblies
Commercial Automatic Changeover Regulators
CAPACITY
BTU/HR.
PROPANE
TYPE
INLET
CONNECTION
OUTLET
CONNCETION
OUTLET
PRESSURE SETTING
OUTLET
ADJUSTMENT RANGE
MOUNTING
BRACKET
1,575,000
HSRL-749B
1/2-inch FNPT
3/4-inch FNPT
11-inches w.c.
27 mbar
9 to 13-inches w.c. 22 to 32 mbar
P100A
1,210,000
64SR/122
1/2-inch FNPT
1/2-inch FNPT
10 psig
0.69 bar
5 to 20 psig
0.35 to 1.4 bar
- - -
Maximum Inlet Pressure
250 psig / 17.2 bar
Temperature Range
-20 to 160°F / -29 to 71°C
CAUTION
Capacity of all these changeover
manifolds is dependent on the size of
the second stage regulator with which
they are used.
!
WARNING
If the manifolds are used on final-stage
(pounds-to-pounds), a relief valve is
required in the downstream system.
Commercial Automatic Changeover Regulators
Designed for large capacity multi-cylinder or tank
installations, these regulators are used on such
applications as bakeries, motels, restaurants, and
grain dryers. The manifold portion of the assembly
(Type 749B/21) consists of two Type 64 regulators and
a direct mounted Type 803 indicator.
Type HSRL-749B
—For low-pressure service. The
Type HSRL second-stage portion has the “drip lip”
vent feature and built-in travel stop to open the internal
relief valve.
Type 64SR/122
—For high-pressure (pounds to
pounds) service with the second-stage composed of
Type 64SR that has internal relief.