Grain-systems PNEG-526 User Manual download pdf (Page 170)

To Change Spring

A. The outlet pressure ranges of spring 9 are given in the tables

on Pages 3 and 4. To change the spring:

1. Remove top cap 1.

2. Unscrew and remove adjustment button 3, 3a or 6 by turn-

ing counterclockwise, and remove spring 9.

3. Insert new spring. Make sure it is positioned correctly at the

bottom before replacing adjustment button 3, 3a or 6.

4. Adjust for the desired outlet pressure per previous section

“Set Point Adjustment”.

5. When adjustment is complete, replace top cap 1. Screw it

securely into place. Leaving it off could result in unstable

regulator operation.

6. New spring range should be marked on regulator. If old spring

range appears on regulator, it should be removed.

Shutdown

A. To take the regulator out of service, close the inlet stop valve

first. Close it carefully. Then close the outlet stop valve.

Before working on regulator, read the next section “General

Servicing Instructions” and the applicable servicing instructions.

Set Point Adjustment

A. The 121 is factory adjusted as specified on the order. To change

the set-point, readjust as follows:

1. Remove the top cap 1.

2. Adjust set-point with adjustment button 3, 3a or 6. Turn clock-

wise to increase and counterclockwise to decrease the

outlet pressure.

NOTE: a. Only make this adjustment when gas is actually

flowing through the regulator. The flow should be

small (approximately 1000 SCFH). Do not adjust

when the regulator is closed and there is no flow.

b. Do not increase the set-point beyond the upper

limit of the outlet pressure range for the spring 9

(refer to spring tables, Page 3).

c. Always check the outlet pressure with a pressure

gauge while adjusting the set-point.

3. When adjustment is complete, replace top cap 1. Screw it

securely into place. Leaving it off could cause unstable regu-

lator operation.

CAUTION

It is the user’s responsibility to assure that all

regulator vents and/or vent lines exhaust to a

non-hazardous location away from any po-

tential sources of ignition. Where vent lines

are used, it is the user’s responsibility to as-

sure that each regulator is individually vented

and that common vent lines are not used.

CAUTION

The diaphragm case vent must be positioned

to protect against flooding, drain water, ice

formation, traffic, tampering, etc. The vent

must be protected against nest building

animals, bees, insects, etc. to minimize the

chances for foreign material from collecting

in the vent side of the regulator diaphragm.

General Servicing Instructions

A. Before any disassembly of the regulator make sure it is com-

pletely depressured. Pressure must be fully released from the

inlet, the outlet and the control line connection. Failure to ad-

equately depressure could result in serious personal injury.

B. Carefully note the location and position of all disassembled

parts to be certain reassembly is correct. Inspect each part

carefully and replace any that are worn or damaged or other-

wise unsatisfactory.

C. Upon completion of servicing, make certain that the regulator

installation is entirely free of leaks.

CAUTION

Turn gas on very slowly. If an outlet stop valve is

used, it should be opened first. Do not overload

diaphragm with a sudden surge of inlet pressure.

Monitor the outlet pressure during start-up to

prevent an outlet pressure overload.

CAUTION

Regulators are pressure control devices with

numerous moving parts subject to wear that

are dependent upon particular operating

conditions. To assure continuous satisfactory

operation, a periodic inspection schedule

must be adhered to with the frequency of

inspection determined by the severity of

service and applicable laws and regulations.

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Grain-systems PNEG-526 User Manual Page 170

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