Culligan Medallist Series Installation And Operation Instructions With Parts List page 8

Pressure
The filter is designed to operate within a pressure range of 20 to 125 psi. Pressures below 20 psi may
cause the unit to perform and recharge inefficiently, while pressures above 125 psi can cause damage and
noisy operation of the control valve.
Low pressure is generally not a problem with municipal water supplies, although some adjustments of the
well pump system may be required on private supplies. Although uncommon, some municipal supplies
may exceed the high pressure limit. A pressure reducing valve should be installed if such pressures are
encountered. Keep in mind, also, that some municipal supplies have higher pressure during nighttime
hours.
Check the available water pressure with a gauge assembly to determine what adjustments, if any, are
necessary (Figure 1). Place the gauge on a raw water line and open a nearby faucet. Adjust the faucet
until the flow is about 5 gallons per minute and check the pressure. In the case of a private well system,
allow water to run until the pump cuts in. If the pressure is less than 20 psi at this point, adjust the pump
pressure switch as required to raise the cut-in pressure above 20 psi.
Pressure Drop
Figure 1
Whenever water is flowing, a certain amount of pressure is lost due to resistance from pipe, fittings, and
appliances connected to the water supply. The amount of pressure drop encountered depends on how fast
the water is flowing and how much resistance it meets. The amount of pressure available at a tap is also determined by its height
above the source of the supply. For example, if water pressure in the basement is 50 psi, it will be about 45 psi on the ground
floor, and about 40 psi on the second floor, or a reduction of about 5 psi for every 10 feet of elevation.
Particularly in the case of private water supplies, it may be necessary to increase the pump pressure to overcome pressure drop
through the conditioner so that adequate pressure is available at all taps.
As the filter bed becomes loaded with the particulate matter it has removed, pressure drop will increase. The filter must be
backwashed when the pressure drop reaches unacceptable levels. The filter should always be installed prior to the water heater.
Caution! The use of a pressure reducing valve may limit the flow of water in the household.
Temperature
Do not install the unit where it might freeze, or
next to a water heater or furnace or in direct
sunlight. Outdoor installation is not recommended,
and voids the warranty. If installing in an outside
location, you must take the steps necessary to
assure the filter installation plumbing, wiring, etc.
areas well protected from the elements (sunlight,
rain, wind, heat, cold), contamination, vandalism,
etc. as when installed indoors.
Figure 2
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5 Culligan Medallist Series Water Filters