Instructions for the Marshall, model 254 Dual Tank Regulator
These are the instructions for the
regulator as copied verbatim from the the back of the package.
These instructions apply to all model 250 series regulators.
INTRODUCTION:
Thank you for purchasing the Model 254 regulator.
The Model 254-00 two stage changeover regulator offers the convenience
of changeover from empty to full cylinders, plus the additional efficiency
of two stage pressure regulation. The top portion of the changeover is a
dual high pressure regulator, which reduces container pressure to approximately
10 to 15 PSIG and sends it to the second stage regulator, which completes the
regulation process by reducing the 15 PSIG inlet pressure down to 11 inches
of water column (0.4 PSIG) outlet pressure.
NOTE: THE 254-00 IS AN INTEGRAL, TWO STAGE REGULATOR THAT
MEETS RVIA REQUIREMENTS FOR USE ON RECREATIONAL VEHI-
CLES AND COMPLIES WITH REVISED UL 144 REQUIREMENTS
(JUNE 1998) AND NFPA REQUIREMENTS.
INSTALLATION:
The regulator will function regardless of the position in which it is mounted.
However, ANSI A119.2, NFPA 501C Recreational Vehicles Code 2-2.7.6
provides in part, "The regulator(s) shall be mounted only in a position
(with the vent pointed) downward within 45 degrees of vertical and the
diaphragm area being drained" (emphasis added). It is important to install
the regulator in a position in which the cover cannot possibly become a
receptacle for water or other foreign material. Marshall suggests following
these
same installation guidelines as it pertains to vent location for all applications.
OPERATION:
Make sure there is propane in both cylinders before you start. Rotate the black
lever on the top front side of the regulator toward the cylinder you want to
use first.
This will be the "service" cylinder and the other will be the "reserve" cylinder.
Slowly open both cylinder valves. The indicator on the top of the regulator
will turn
bright green. The indicator will stay green as long as there is fuel coming
from the service
side. When the service cylinder empties, the regulator will start drawing from
the reserve
cylinder providing an uninterrupted fuel flow to the system. When it switches
over, the
indicator color changes from green to red. This red color indicates the service
cylinder is
empty and needs to be filled. To remove the empty cylinder, rotate the black
lever all the way
over towards the reserve cylinder. The indicator will turn green and the reserve
cylinder
becomes the service cylinder. Now shut off the cylinder valve on the empty cylinder.
Now disconnect the cylinder and have it refilled. After filling, reconnect the
pigtail and slowly
open the cylinder valve. The full cylinder now becomes the reserve cylinder.
IMPORTANT: Only qualified persons should install, adjust or service LP gas
regulators.
If service is needed, contact a qualified LP dealer. Always make sure cylinders
are properly
filled and never accept cylinders that are over filled. When replacing newly
filled cylinders
to the regulator, check all connections for leaks with an approved leak detector
solution or a
mixture of non-ammonia soap and water. Never use matches or an open flame.
Note: Low pressure regulators are designed to regulate LP vapor only.