Maxitrol 325-3L48 User Manual

Line Pressure Regulators and Over-Pressure Protection Devices

For piping systems up to 5 psi

SYSTEM COMPONENTS

Maximum Inlet Pressure:

CSA Certied ............................................. 5 psi (345 mbar)

Emergency Exposure Limits:

(inlet side only) ............................................. 65 psi (4.5 bar)

Outlet Pressure Range:

Certied spring .......................................... 7 - 11 inches w.c.

Maximum Individual Load:

Largest single appliance served (regulator with OPD)

325-3L47 (3/8”, 1/2”) (w/OPD 47 attached) ... 125,000 Btu/hr

325-3L48 (1/2”) (w/OPD 48 attached) ............ 200,000 Btu/hr

325-5AL48 (1/2”) (w/OPD 48 attached) ......... 235,000 Btu/hr

325-5AL48 (3/4”) (w/OPD 48 attached) ......... 320,000 Btu/hr

325-5AL600 (3/4”) (w/OPD 600 attached) ...... 425,000 Btu/hr

325-5AL600 (1”) (w/OPD 600 attached) ......... 465,000 Btu/hr

CSA Design Certied Z21.80 / CAN 6.22

Attention: Line pressure regulators with separate overpressure protection devices shall be factory preassembled, and supplied to the eld as a unit.

Capacity:

Total load of all appliances combined (regulator with OPD)

325-3L47 (3/8”, 1/2”) (w/OPD 47 attached) ....125,000 Btu/hr

325-3L48 (1/2”) (w/OPD 48 attached) ........... 200,000 Btu/hr

325-5AL48 (1/2”) (w/OPD 48 attached) ......... 235,000 Btu/hr

325-5AL48 (3/4”) (w/OPD 48 attached) ......... 320,000 Btu/hr

325-5AL600 (3/4”) (w/OPD 600 attached) ...... 425,000 Btu/hr

325-5AL600 (1”) (w/OPD 600 attached) ......... 465,000 Btu/hr

Venting:

OPD 47 ................... integral vent limiting orice w/dust cap

OPD 48 (optional 12A09 vent limiter) .................... 1/8” NPT

OPD 600 (optional 12A09 vent limiter) .................... 1/8” NPT

Gases: Intended for application in natural gas piping systems up to 5 psi.

Ambient Temperature Limits: -40° to 205°F (0° to 96°C)

Note: All Maxitrol gas appliance regulators must be installed

and operated in accordance with Maxitrol’s ‘Safety Warning’ bulletin.

The 325 Series is suitable for limited horizontal mounting (less than or equal to 90° from upright). But when using the vent limiting device, the regulator must be mounted in a horizontal upright position.

Upright

Install the regulator properly

with gas owing as indicated by the arrow on the casting (also see the Safety Warning Instructions bulletin).

NOTE: Vent limiters are designed for use indoors and in spaces where limiting the amount of gas escapement due to diaphragm failure is critical. Vent

limiters should not be used outdoors if they are exposed to the environment. 13A15 vent protector

is available for outdoor use when vent protection is required.

FEATURES

• CSA certied for up to 5-psi inlet pressure

• Over-pressure protection device (OPD) to limit downstream pressure in case of regulator failure

• Maxitrol OPD approved and tested with the regulator

• Self-aligning valve with lever action for dead end regulator lockup

• Optional vent limiter eliminates the need to run vent piping to an outside area

BENEFITS

• Meets ANSI standard Z21.80 for line pressure regulators — for use on piping systems such as CSST or semi-rigid copper tubing up to 5-psi

• OPD provides required downstream over pressure protection for supply pressures in excess of 2-psi

• Pounds to inches regulator provides precise control from pilot ows to full regulator capacity

• Meets many utility specications

THE NEW LINE PRESSURE REGULATOR STANDARD - ANSI Z21.80

Although Maxitrol’s 325 Series are certied (ANSI Z21.18) as appliance regulators (see bulletin 325LVR_MS_EN), in the past they have often been used as line pressure regulators. Until very recently, there was no standard for line pressure regulators.

Z21.80 is the new ANSI standard for line pressure regulators, intended for application in natural gas piping systems. As of May 1, 2002, CSA requires that all line pressure regulators above 2-psi must leave the factory pre-assembled and leak tested. At supply pressures in excess of 2-psi, the new line regulator standard requires a means (an over-pressure protection device / OPD) — approved and tested with the regulator — to limit the downstream pressure to 2-psi maximum, in the event of regulator failure. Line pressure

regulators with separate overpressure protection devices shall be factory preassembled, and supplied to

the eld as a unit. Maxitrol-built OPDs provide the required downstream over-pressure protection.

As optional accessories, the regulators and OPDs offer an automatic vent limiting device. The 12A09 or 12A39 vent limiters eliminate the need to run vent piping to an outside area - in the event of a diaphragm rupture, gas escapement is limited to within the ANSI standards level. The 325 Series are suitable for limited horizontal mounting (less than or equal to 90° from upright) - but when using a vent limiting device, the regulator must be mounted in a horizontal upright position for best performance. Install the regulator properly with gas owing as indicated by the arrow on the casting.

To deliver positive dead-end lock up, the 325 Series feature a high leverage valve linkage assembly. Lockup pressure can vary with the speed of the solenoid valve and its location. The regulators are capable of precise regulating control from full ow down to pilot ows.

The self-aligning valve is made of nitrile rubber. Housings are durable aluminum die castings and all internal parts are carefully selected and corrosion resistant. The diaphragms are of high quality supported synthetic rubber compounds.

The regulator with OPD is certied for inlet pressures up to 5-psi, and can withstand emergency exposure inlet pressure up to 65-psi. The regulator alone provides no downstream over-pressure protection in the event of failure.

Other 325 Series regulators will continue to be available as CSA certied appliance regulators, as well as noncertied models for up to 10-psi inlet pressure (see bulletin 325LVR_MS_EN).

NOTE: Immediately after installation and prior to operating any appliance: It is important to check the preassembled pipe connection between the regulator and OPD for leakage. Even though the Maxitrol 5 psi line

regulator with OPD is shipped as an assembly, installation of the assembly can result in turning (tightening or loosening) of the preassembled connection. If gas leakage is detected, follow the same procedures to stop the leak as you would use with any eld pipe connection, and repeat step number 5 according to the ‘Safety Warning’ bulletin.

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