- Inlet: 1/2" FNPT
- Outlet: 1/2" FNPT
- Outlet Pressure Setting Supply Setting: 15 PSI
- Outlet Pressure Setting Reserve Setting: 5 PSI
- Capacity BTU/HR: 1,500,000 *
* Capacity in BTU per hour LPG:
Based on 100 psig inlet, reserve setting.
Type 749B-21 – Large capacity changeover manifold for commercial and industrial applications. It consists of two 64 Series regulators and a 803 Series direct indicator. The assembly is used primarily in conjunction with either a Type HSRL or 64SR regulator. The standard outlet setting is 15 psig from the supply and 5 psig from the reserve. Temperature rating for the Type 749B-21 is -20 to 150°F.
Note: These units are intended for use with Second-Stage regulators and/or separate relief devices which provide overpressure protection required by NFPA 58. Capacity of all these changeover manifolds is dependent on the size of the Second-Stage regulator with which they are used. If the manifolds are used as a Final-Stage (pounds-to-pounds), a relief valve is required in the downstream system.