Emerson 912 Instruction Manual

Instruction Manual

VENT

V E N T

VENT

Form MCK-1106

June 1986

Low Pressure Regulators

Single and Second-Stage LP-Gas Regulators

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

CLOSING CAP

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

VENT CAN BE OVER INLET OR OUTLET

INLET

Figure 1. Typical Regulator Conﬁgurations

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.

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,

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