Fisher R110, R961, and R962 Automatic Changeover Regulators Manuals & Guides

Instruction Manual

MCK-1096

March 2010

Types R110, R961, and R962

Types R110, R961, and R962 Automatic
Changeover Regulators

WARNING

!

TYPE R110

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. If used
on recreational vehicles, installation
and use must comply with NFPA
No. 501C.

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 re causing property damage and

personal injury or death.

Things To Tell The Gas Customer:

1. Point out the regulator’s vent to the customer 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.

2. Show the customer the shutoff valves on the cylinders.
The customer should cIose these valves 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 a leak develops

in the system. Only a qualied gas serviceman should

install or service the regulator.

4. Inform the user that the supply cylinder is not completely

empty until the red warning ag is fully visible in the

indicator window (B), Figure 2.

INLET

OUTLET

Figure 1. Type R962

INLET

TYPER622

VENT
POINT DOWN

Introduction

Scope of Manual

This instruction manual covers installation and maintenance for
Type R110 automatic changeover manifolds and Types R961
and R962 automatic changeover regulators.

Description

The manifold and regulators are designed for low pressure
(inches of water column) vapor service and are not to be
used for liquid service.

Type R110 withdraws gas from one cylinder until pressure
drops to 7 psig (0,48 bar) and then automatically switches
to the reserve cylinder. The Type R110 must be used in
conjunction with a second-stage regulator.

Types R961 and R962 are composed of the Type R110
connected to the inlet of either a Type 912 or R622 second­stage regulator.

D450018T012

R

www.FISHERregulators.com/lp

Types R110, R961, and R962

Specications

TYPE NUMBER

R110/21 1/4-inch Inverted Flare 1/4-inch FNPT - - - - Hole 500,000

R961/21 1/4-inch Inverted Flare 3/8-inch FNPT 912 Drilled and Screened 125,000

R962/21 1/4-inch Inverted Flare 1/2-inch FNPT R622 3/4-inch FNPT 600,000

INLET AND OUTLET CONNECTIONS

Inlet Outlet

Note

These instructions assume that the
Type R110 manifold has been assembled
to a suitable second-stage regulator.

Specications

Specications are shown above for the manifold and the

regulators. Contact the factory if the equipment is to be
used on any service other than LP-gas, natural gas or air.
Temperature limits are -20° to 16 0°F (-29° to 71°C) and the
maximum inlet pressure is 250 psig (17,2 bar).

Installation

WARNING

!

SECOND-STAGE

REGULATOR

accumulation or ice formation, such as directly beneath a
down spout, gutter, or roof line of a building.

Types R961 and R962 can be installed without a protective
hood if their vent is pointed vertically down, see Figure 1.
When any of the regulators are used on recreational vehicles,
a hood or enclosure is required to protect the regulator’s vent
from road splatter.

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. The
outlets of the cylinder valves should be cIeaned to remove
dirt or water. One method of doing this is by cracking the
cylinder valve open for a short period of time to blow out the
dirt. Apply pipe compound to the male threads of the pipe.

VENT OPENING

Operation

On recreational vehicle applications,
the regulators must be installed in a
compartment or under a protective cover.

All vents should be kept open to permit

free ow 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.

LP-gas may discharge to the
atmosphere through the vent. An
obstructed vent which limits air or gas

ow can cause abnormally high pressure

that could result in personal injury or
property damage.

Make sure gas ow through the regulator is in the correct
direction. There are two 1/4-inch inverted are inlet

connections and the “Outlet” connection is clearly marked
on the regulator. The installation should be adequately

protected from vehicular trafc and damage from other

external sources.

Install the regulator high enough above ground Ievel-at least
18-inches (457 mm) – so that rain splatter cannot freeze in the
vent. Whether a protective hood is used or not, do not install
the regulator in a location where there can be excessive water

Place one of the two cylinders in “Supply” by rotating the
changeover knob (A), see Figure 2, either way as far as
it will go. The arrow will denote the “Supply” service side.
Open both cylinder valves slowly.

Gas will now ow from both cylinders through pigtails into
the rst-stage section of the Type R110 by way of the inlet
ttings. When a pressure of 7 psig (0,48 bar) is reached

beneath the Type R110 diaphragm, the closing spring in the

inlet tting will shutoff gas from the “Reserve” cylinder.

Gas from the “Supply” cylinder will continue to enter the
rst-stage regulator in the inlet tting until approximately
15 psig (1,03 bar) is maintained. The second-stage
regulator (Type 912 or R622) reduces this pressure to
11-inches wc (0,03 mbar) for the appliances.

The “Supply” side of the rst-stage regulator will continue to
supply gas as long as sufcient gas remains in the “Supply”

cylinder. When pressure in the cylinder drops to about 7 psig

(0,48 bar), the “Reserve” side of the rst-stage regulator will

open and maintain 5 psig (0,35 bar) pressure to the second­stage regulator, which continues to regulate at 11-inches wc
(0,03 mbar). At the time the “Supply” cylinder becomes

exhausted, a red warning ag appears in the indicator window

(B) and also on the remote indicator if used.

VAPOR CAPACITY,
BTU/HR PROPANE

2

Types R110, R961, and R962

A

B

C

Figure 2. Typical Hook-up

Exchange of Cylinders

Before removing the empty cylinder, be sure to rotate the
changeover knob (A) so that it points to the other cylinder.
Then close the valve of the empty cylinder to prevent air from
entering the cylinder and disconnect the cylinder. Clean
the cylinder valve’s outlet in the new cylinder. After the new
cylinder is in place, slowly open the cylinder valve.

CAUTION

There will still be pressure in the
empty cylinder.

The new cylinder now becomes the reserve cylinder, and the

red warning ag will not be visible at the indicator window.

If only one cylinder is left connected, the pigtail or hose to
the other cylinder must be capped to prevent leakage or
contamination.

The pigtail or hose must be capped because
gas will escape to the atmosphere through
the open connection if pressure in the
supply cylinder drops to 5 psig (0,35 bar)

(red indicator ag visible). Turning the

changeover knob to the disconnected side
will also permit gas to escape.

WARNING

!

Adjustment

Type R110 is factory set and is non-adjustable. Each
second-stage regulator is individually factory set to deliver
11-inches wc (0,03 mbar). If it becomes necessary to
increase outlet pressure, remove the closing cap (C), Figure
2, and turn the adjusting screw clockwise. Turn the adjusting
screw counterclockwise to decrease the outlet pressure. A
pressure gauge or water manometer is needed to determine
the regulator’s outlet setting after adjustment. Always
replace the closing cap after the adjustment is made.

Overpressure Protection

WARNING

!

Personal injury or system damage may result
if these regulators are installed without
appropriate overpressure protection. Outlet
pressures greater than 3 psig (0,21 bar) above
the set point may cause damage to regulator
parts, leaks in the regulator, or personal injury
due to bursting of pressure-containing parts
or explosion of accumulated gas.

If the regulator is exposed to an
overpressure condition, it must be inspected
for any damage that may have occurred.

Large volumes of gas may discharge through
the regulator vent during internal relief

valve operation which can result in re or

explosion from accumulated gas.

The regulators have an internal relief valve that opens
when downstream pressure reaches approximately 1 psig
(0,07 bar) on regulators set at 11-inches wc (0,03 mbar).
When the internal relief valve opens, gas escapes to the
atmosphere through the regulator’s vent. The internal relief
valve gives overpressure protection against excessive build­up resulting from seat leakage due to worn parts or chips of

foreign material on the orice.

Some type of external overpressure protection must be
provided if inlet pressure will be high enough to damage
downstream equipment. Common methods of external
overpressure protection include relief valves, monitoring
regulators, shutoff devices, and series regulation. The internal
relief valve with the 3/4-inch (19,1 mm) vent (Type R962)
limits downstream pressure to 2 psig (0,14 bar) as long as
inlet pressure to the second-stage portion does not exceed
20 psig (1,40 bar) and the vent is unobstructed.

3

Types R110, R961, and R962

Maintenance

WARNING

!

To avoid personal injury or equipment
damage, do not attempt any maintenance

or disassembly without rst isolating the

regulator from system pressure and relieving
all internal pressure.

Regulators that have been disassembled for
repair must be tested for proper operation
before being returned to service. Only parts
manufactured by Fisher should be used
for repairing Fisher regulators. Relight
pilot lights according to normal startup
procedures.

Due to normal wear or damage that
may occur from external sources, these
regulators must be inspected and maintained
periodically. The frequency of inspection
and replacement of the regulators depends
upon the severity of service conditions or
the requirements of local, state, and federal
regulations. Even under ideal conditions,
these regulators should be replaced after 15
years from the date of manufacture or sooner

should inspection reveal the need.

Failure to do the above could result in personal injury or
property damage.

Make sure the regulator’s vent does not become plugged
by mud, insects, ice, snow, paint, etc. The vent screen aids
in keeping the vent from becoming plugged, and the screen
should be clean and properly installed.

Replace any regulators that have had water in their spring
case or show evidence of external or internal corrosion.
Checking for internal corrosion may require complete removal
of the adjusting screw and shut down of the gas system.
Correct any improper installations.

Older regulators are more likely to catastrophically fail
because of worn or corroded parts. Replace regulators over
15 years of age; other service or environmental conditions
may dictate replacement of the regulator before it becomes
15 years old, refer to Fisher Bulletin LP-32.

Regulator Repair

Regulators that have been disassembled for repair must
be tested for proper operation before being returned to
service. Fisher Type Y499-2 test rack can be furnished for
this purpose. Only parts manufactured by Fisher should be
used for the repair of Fisher regulators. Be sure to give the
complete type number of the regulator when corresponding
with the factory.

Visually inspect the regulator each time a gas delivery is
made for:

1. Improper installation.

2. Plugged or frozen vent.

3. Wrong regulator or no regulator in the system.

4. Internal or external corrosion.

5. Age of the regulator.

6. Any other condition that could cause the

uncontrolled escape of gas.

LP-Gas Equipment

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75069-1872 USA
Telephone: [phone]
Telephone: [phone]

For further information visit www.sherregulators.com/lp

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business of Emerson Process Management.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or

guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications of such

products at any time without notice.

Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson
Process Management product remains solely with the purchaser.

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