MCDonald 6480 User manual

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Step 1. Turn inlet valve 90º clockwise to Step 2. Turn outlet valve 180º counter clockwise to Step 3. Turn inlet valve clockwise 90º to
Position 1. Position 2. Position 3.
Step 5. Turn outlet valve 180º clockwise to Step 6. Turn inlet valve 90º counterclockwise to
Position 4. Position 5.
Inlet valve at position 5, outlet valve at
position 4 (both arrows toward meters) .
Normal Operating Flow Mode
Bypass Flow Mode
Meter Maintenance
PROCESS 1PROCESS 4 PROCESS 3 PROCESS 2
Purge Mode
Back To Normal Operation Flow Mode
SHUT OFF POSITION
WARNING: This position will shut-off the ow of gas and require shut-off
procedure and pilots re-lit.
Step 4. 1. Fully assemble meter to the bar. 2. Remove purge port plug to allow gas to ow to atmosphere (reference gure above for purge port location).
3. Slowly turn inlet valve to Position 1. 4. Purge meter until the smallest increment dial makes two full revolutions. 5. Replace purge port plug once meter
is purged. DO NOT PURGE IN CONFINED SPACE.
Perform required maintenance to the meter, when the meter change out or meter maintenance has been completed, purge the air out of the new meter
before taking the meter bar out of bypass mode.
To stop the ow of Gas to meter and structure, turn valves to Position 3 & 4.
Natural Gas
6480 By-Pass Procedure
NOTE: Failure to follow this procedure may result in interrupted gas service and loss of pilot lights.
NOTE: It is recommended that a manometer be installed at the downstream pressure tap prior to operating the bypass. The manometer will monitor the downstream pressure. In
the event the pressure drops below your stated system requirements, an improper sequence may have occurred. The valves should be returned to normal operation immediately
to restore ow of gas. Once pressure is restored, the bypass procedure can then be started again. If the pressure drops below your stated system requirements at any time,
pilots need to be checked and possibly relit.
- Bypass application only at regulated pressure.
- Follow all applicable codes and procedures.
5/213210-538
By-Pass Mode
PATENT 7,347,219
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5
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5
Downstream
Pressure Tap
Purge Port

800.292.2737 | [email protected] | aymcdonald.com
Natural Gas
6480 By-Pass Procedure
5/213210-538
Valve Rating 25 PSIG
NOTE: These valves are designed for use with natural, manufactured or LP gas only.
1. Read instructions and reference pressure rating on integral valves before installation or maintenance of meter bar.
2. Inspect valves for foreign material. Remove any foreign material.
3. Always apply a quality grade pipe thread sealant to the pipe before installation - do not use teon tape. Excess pipe
sealant contacting the ball surface may cause the valve to leak.
4. Always wrench nearest to connection point. Never insert a tool into the port area of the valves to thread bar onto
the pipe. A backup wrench should be used on the end pieces when installing swivels. Incorrect tightening or
overtightening of the bar on installation can cause bar failure.
5. Installation torques should be reduced when using pipe heavier than schedule 40.
6. Reference the bypass procedure shown below and on reverse side.
7. Lock the valves to prevent unwanted operation or access. Valves can be locked in "NORMAL FLOW" (through the
meter) or in "BYPASS MODE".
8.
The bypass meter bars are designed to provide uninterrupted gas service to a service during gas meter maintenance. The
ability to maintain gas ow to the service comes from the valves' oversized ports, which allow for a minimum-ow condition
during valve operation.
WARNING: This product can expose you to chemicals including lead, which is known to the State of CALIFORNIA to cause cancer and birth defects or other reproductive harm. For more
information go to: www.P65Warnings.ca.gov.
PORTPORT
PORT
INTEGRAL VALVE FEATURES