Installation and Operation Instructions 1506 George Brown Drive Marshall, MI 49068
For: MEGR-253 / 253H Series Phone (269) 789-6700 Fax (269) 781-8340
Regulators www.marshallexcelsior.com
The contents of this publication are for informational purposes only. While every effort has been made to ensure accuracy, these contents are not to be construed as warranties or
guarantees, expressed or implied, regarding the products or services described herein or for their use or applicability. Marshall Excelsior Co. reserves the right to modify or improve the
designs or specifications of such products at any time without notice. The MEC™ logo is the trademark of Marshall Excelsior Co.
Form #973 MEGR-253/MEGR-253H Rev B 8/22/17
!WARNING!
Failure to follow these instructions or to properly install and
maintain this equipment could result in an explosion and/or fire
causing property damage and personal injury or death.
Marshall Excelsior equipment must be installed, operated, and
maintained in accordance with federal, state, and local codes
and MEC instructions. The installation in most states must also
comply with NFPA 58 and NFPA 54 standards.
Only personnel trained in the proper procedures, codes,
standards, and regulations of the LP-Gas industry should install
and service this equipment.
!DANGER!
Black changeover lever must be rotated as far as possible
towards reserve cylinder before disconnecting empty cylinder.
Failure to rotate changeover lever and / or disconnection of
hose while indicator is red will result in a propane gas leak
which, if ignited, may cause property damage, bodily injury, or
death.
Description
The MEC Automatic Changeover Regulator automatically redirects
LP gas vapor flow from an empty designated service cylinder to a
reserve cylinder, without interruption of service. It is ideal for use
with Recreational Vehicles (RV’s), small cottages and cabins.
!CAUTION!
The MEC regulators are to be installed or adjusted by
qualified LP Gas or RV service personnel only. Contact a
qualified LP Gas or RV dealer for installation.
Operation
Ensure that the regulator has been mounted with the vent
pointing downward so that water or debris cannot gather in the
regulator. Place one of the two cylinders in “primary” by
switching the black changeover lever in the direction of the
selected cylinder. The arrow on the lever will denote the
“primary” side. Open both cylinder valves slowly. The indicator
on the top of the regulator will turn green.
The “primary” side of the regulator will continue to supply gas as
long as sufficient gas is present in the “primary” cylinder. When
pressure in the cylinder drops below a designated pressure, the
“reserve” side will open and continue to primary gas to the
regulator. At the time that the “primary” cylinder becomes
exhausted, the indicator on the changeover lever will turn partial
red and green, indicating a cylinder change can be made.
Cylinder Exchange
Prior to removing the empty cylinder, position the black
changeover lever so that it points to the alternate cylinder that is
now supplying the regulator. Close the valve on the empty
cylinder and remove. After the empty cylinder is refilled and
reconnected, slowly open the cylinder valve. The new cylinder is
now the reserve cylinder. The indicator at the top of the regulator
will turn green.
!WARNING!
Never check for leaks with an open flame. Do not check for
leaks using ammoniated or chlorinated household type
detergents. Only use a solution of water and liquid soap to
check for leaks. These can cause cracks to form on the metal
tubing and brass fittings. If the leak cannot be located, take the
unit to a LP Gas service representative.
Specifications:
BTU Capacity (propane)
Primary
Capacity &
BTU/HR
Reserve
Capacity &
BTU/HR
Inlet: 1/4" NPT
Outlet: 3/8” NPT
UL Listed to UL 144
Based on 100 PSIG inlet pressure and 20% droop at
manufacturer’s set point.
Manufacturer's set point = 100 PSIG Inlet and 11" W.C.
outlet flowing at 30 SCFH propane.
