Pentair PRF-RO Installation And Maintenance Manual page 7

2 - THE BASIC REVERSE OSMOSIS SYSTEM
Location of system
The reverse osmosis system is designed for installation under a sink, usually in the kitchen or bathroom. The RO
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assembly can be placed on the cabinet floor in any position that does not apply pressure on the disconnect
elbows. The RO product water faucet installs on the sink or on the countertop next to the sink.
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The RO system can also be located in a location away from the faucet. A nearby water source and drain point are
required.
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NOTE:
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• Keep the lengths of tubing short. Longer lengths of tubing will decrease system performance. A booster pump
can be used on the supply line.
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• All plumbing should be done in accordance with state and local plumbing codes.
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Some codes may require installation by a licensed plumber. Check with the local plumbing authority prior to
installation.
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WARNING:
Water Supply: To provide supply water to the RO system inlet, a feed supply fitting is required or install pipe fittings
as needed. The feed water valve should be located as close to the manifold assembly as possible. USE A POTABLE
COLD WATER SUPPLY ONLY. Softened water is preferred as it will extend the life of the RO membrane element.
Drain Point: A suitable drain point is needed for reject water from the RO system. A floor drain, laundry tub,
standpipe, sump, etc. are all acceptable. If discharging into the utility sink or standpipe, an air gap of greater than
1/2" above the flood rim must be provided.
A sink p-trap drain adapter is included to install as an optional drain point where codes permit.
Do not connect the system drain line to the dishwasher drain or near the garbage disposal. Back pressure from
these units may cause the air gap to overflow.
Faucet: The faucet should be placed near the sink where drinking water is normally obtained. Convenience of use
(filling of water pitchers and glasses) and an open area beneath the faucet under the sink for attaching product
and drain tubing are considerations.
A 2" diameter flat surface is required above and below the installation site. The thickness of mounting surface
should not exceed 1"1/4. Avoid any strengthening webbing on the underside of the sink.
RO Manifold Assembly: The manifold can be installed on either the right or left side of the under-sink area or
cabinet. Installation in the basement is also an option. One possible location is near the laundry/ utility sink where
cold potable water and drain access are close. The location chosen should allow adequate clearance and
accessibility for membrane element changes.
In restricted under-sink areas, it may be easier to install the faucet first. Allow adequate tubing lengths for final
system placement.
All components and tubing should be located in an area which is not exposed to freezing
temperatures. Do not expose unit or tubing to direct sunlight.
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