Installation Instructions
A. Unpack all components carefully and inspect for potential damage in shipment. If a lower pressure is required downstream at the intended
point of use than the setting of the line regulator, use an appropriate line regulator.
B. The changeover panel is equipped with (4) mounting slots for ¼” bolts for simplified installation. This panel may be mounted directly to the
wall or other structural support. The bottom of the panel should be mounted approximately 65½” from the floor. Mount the unit to the wall or
sturdy surface with bolts, nuts and washers (not included).
NOTE: This unit can be installed outdoors, but it must be under a roof to protect it from direct rain and snow.
C. Connect gas distribution tubing (stainless steel or copper) consistent with your purity applications to the outlet ¼” FNPT fitting provided.
D. After cylinders are moved into position at the changeover regulator, remove the cylinder cap and examine the cylinder valve outlet for
contamination. Crack-open the cylinder valve briefly before attaching the pigtails (except when using hydrogen, methane or other reactive
gases or mixtures).
Additional items required for installation (not supplied with changeover):
1. Mounting bolts, nuts and washers
2. Gas cylinders
3. Optional cylinder rack, mounting brackets, chains or straps to secure the cylinders
4. Bubble-type leak detector solution
Cylinder Storage and Use
A. When storing and using cylinders, secure to a wall or vertical support using brackets, restraining straps, chains, clamps, or other approved
devices.
B. When moving cylinders, use a cylinder cart or truck with chain restraint in place.
Do not drag or roll cylinders.
C. Do not drop or roll cylinders in a horizontal position, as the cylinder valve might be broken off releasing high-pressure gas and turning the
cylinder into a projectile.
Attaching Cylinders to Changeover Panel
A. Close changeover panel isolation valves (at bottom of panel). Connect the pigtails to the cylinder valves with either the wrench-tight or
optional hand-tight CGA connection.
Do not allow any oil, grease, or other potential contaminating lubricants to come in contact with
any components.
These panels are factory assembled under rigorous high-purity conditions without any use of hydrocarbon or halocarbon
lubricants.
B. Check for leaks at the cylinder valve and other connections using a leak detector or by using an approved bubble-type leak detection solution.
NOTE: While soap solution is suitable for safety consideration, this is not the preferred method for high purity systems. Should a
leak be present, aspiration of the soap solution into the process piping may present a contamination concern.
C. If a leak is found, depressurize component and tighten where necessary. Contact your gas supplier immediately if you have a leaking cylinder.
If the cylinder is of flammable or toxic mixture, immediately close the cylinder valve and follow the safety instructions provided with the
cylinder for proper venting of the gas. Even a leaking cylinder of an inert gas presents a danger in an enclosed area due to the displacement
of air.
Operation (refer to fig. 1- PD&I schematic diagram on pg 4)
A. Turn large knob to cylinder 1. The change-over system is now drawing gas from cylinder 1.
B. Adjust the delivery pressure on the line regulator to the desired outlet pressure.
C. When cylinder 1 depletes, the change-over system will automatically begin to draw from cylinder 2.
D. Before replacing depleted cylinder 1, turn the large knob to cylinder 2. This will ensure that cylinder 2 will be depleted before the panel
switches back to the new cylinder 1.
NOTE: Do not use this system with toxic or corrosive gases requiring inert gas purging.
Changeover Manifold Operation Theory
Combination Regulator System
The left manifold and the right manifold supply regulators are mounted back-to-back with a single outlet and a single adjustment knob. The left
manifold regulator is set to deliver product from the left bank cylinder or cylinders when the arrow on the primary regulator knob is pointing to the
left side. Likewise the right manifold regulator is set to deliver product from the right bank cylinder or cylinders when the right side is acting as
the primary source and the arrow on the selector knob is pointing to the right.
