Emerson 912 Instruction Manual

Instruction Manual

VENT

V
E
N
T

VENT

VENT

VENT

Form MCK-1106

June 1986

Low Pressure Regulators

Single and Second-Stage LP-Gas Regulators

C

VENT CAN BE PLACED IN
POSITION C, D, E, OR F

CLOSING
CAP

D

OUTLET

INLET

WARNING

!

Fisher equipment must be installed, operated,
and maintained in accordance with federal,
state, and local codes and Fisher instructions.
The installation in most states must also
comply with NFPA No. 54 and 58 standards.

Only personnel trained in the proper
procedures, codes, standards, and
regulations of the LP-gas industry should
install and service this equipment. 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.

Things To Tell The Gas Customer:

1. Point out the regulator’s vent to the customer
(or vent assembly or vent tube), and stress that this
opening must remain unobstructed at all times. Tell
the customer to be sure to check the vent opening after a
freezing rain, sleet storm, or snow to make sure ice has not
formed in the vent.

OUTLET

CLOSING
CAP

F

VENT CAN BE
OVER INLET
OR OUTLET

INLET

Figure 1. Typical Regulator Configurations

E

Description

All the regulators are designed for low pressure
(inches of water column) vapor service and are not to be
used for liquid service. Their ou
usually 11-inches w.c (27 mbar).

Single-stage regulators (reducing container pressure
to 11-inches w.c. (27 mbar)) are normally painted gray
while second-stage regulators (reducing the outlet
of a first-stage regulator to 11-inches w.c. (27 mbar))
are normally painted palm green. The units differ in
construction and capacity rating.

tlet pressure setting is

2. Show the customer the shutoff valve on the container.
The customer should close this valve immediately if gas can
be smelled, appliance pilot lights fail to stay on or appear
higher than usual, or any other abnormal situation occurs.

3. Tell the customer to call your company to service the
regulator. If the regulator vents gas or leak develops in
the system, only qualifie

d gas serviceman should install or

service the regulator.

Introduction

Scope of Manual

This instruction manual covers installation and maintenance
for the following single and second-stage LP-gas regulators:
Types 912, R322 (integral two-stage), R352, R722, R922,
R932, and S102L.

R

Specifications

The Specifications table lists the specifications for the
regulators. Contact the factory if the regulators are to be
used on any service other than LP-gas, natural gas, or
air. Temperature li
Second-stage regulators are limited to 20 psig (1,4 bar) inlet
pressure and must be used with a first-stage regulator.

Installation

All vents should be kept open to permit
free flow of air into and out of the regulator.
Protect openings against the entrance of
rain, snow, ice formation, paint, mud, insects,
or any other foreign material that could plug
the vent of vent line.

www.FISHERregulators.com/lp

mits are -20° to 160° F (-29° to 71° C).

WARNING

!

D450023T012

Low Pressure Regulators

VENT

Specifications

TYPE NUMBER

†

912

R322 1/4 1/2 or 3/4 Integral Two-Stage 250 (17,2) 660,000

R352 3/4 3/4 Second-Stage 20 (1,38) 1,250,000

R722

R922

R932

S102L 3/4 – 1-1/2 3/4 – 1-1/2 Second-Stage 20 (1,38) 2,000,000

*320,000 BTU/Hr. with pigtails

INLET CONNECTION OUTLET CONNECTION

3/4 or F. POL

1/4, 1/2 or F. POL 1/2 or 3/4 Single-Stage 250 (17,2) 725,000

3/4 or F. POL

SIZE, INCH FNPT

1/4 1/4 or 3/8 Single-Stage 250 (17,2) 350,000*

3/4 Single-Stage 250 (17,2) 4,250,000

3/4 3/4 Second-Stage 20 (1,38) 2,500,000

1/2 1/2 or 3/4 Second-Stage 20 (1,38) 750,000

3/4 Single-Stage 250 (17,2) 1,200,000

1/2 3/4 Second-Stage 20 (1,38) 1,250,000

#

437,500 BTU/Hr. with pigtails

POINT VENT
DOWN

†

Vent not normally tapped for vent tubing

TYPE OF SERVICE

TO APPLIANCES

VENT
LINE

BASEMENT

MAXIMUM INLET

PRESSURE,

PSIG (bar)

VAPOR CAPACITY,

BTU/HR.

PROPANE

#

VENT
ASSEMBLY

VENT OPENING
MUST BE AT LEAST
3-FEET (0,91 meters)
HORIZONTALLY
FROM ANY BUILDING
OPENING BELOW IT

Figure 2. Point Vent Down on Outdoor Installations

LP-gas may discharge to the atmosphere
through the vent. An obstructed vent which
limits air or gas flow can cause abnormally
high pressure that could result in personal
injury or property damage. Failure to use a
vent line on indoor installations can cause a
hazardous accumulation of gas which could
result in personal injury or property damage.

Never use a first-stage (pounds to pounds)
regulator on low pressure (inches of water
column) service because personal injury or
property damage could occur.

Make sure gas flow through the regulator is in the same
direction as the arrow on the body – ”Inlet” and “Outlet”
connections are clearly marked. The installation should be
adequately protected from vehicular traffic and damage from
other external sources. Install the regulator so that any gas
discharge through the vent or vent assembly is over 3-feet
(0,91 meters) horizontally from any building opening below
the level of the discharge.

Install the regulator high enough above ground level – at least
18-inches (457 mm) – so that rain splatter cannot freeze in the

FROM FIRST STAGE
REGULATOR

Figure 3. Typical Indoor Installation With
Vent Line and Vent Assembly

vent. Whether a protective hood is used or not, do not install
the regulator in a location where there can be excessive water
accumulation or ice formation, such as directly beneath a
down spout, gutter, or roof line of a building.

A regulator installed outdoors without a protective hood
must have its vent pointed vertically down, see figure 2, to
allow condensate to drain. This minimizes the possibility of
freezing and of water or other foreign material entering the
vent and interfering with proper operation.

Before installing the regulator, check for damage which might
have occurred in shipment. Also check for and remove any
dirt or foreign matter which may have accumulated in the
regulator body or the pipeline. Apply pipe compound to the
male threads of the pipe.

Some installations, such as in areas with heavy snow fall
or on recreational vehicles where there is road splatter,

2