Franklin Electric Inline 1100 Owner's Manual page 9

4. Install inlet and outlet plumbing and pressure tank as shown in FIGURE 2. A check valve
must be installed in the inlet and outlet plumbing. The outlet check valve should be between
the pump and the pressure tank to prevent the possibility of backflow into public water
systems and to ensure proper system operation. The inlet check valve should be used when
no other backflow prevention device is present. This inlet check valve should be installed
before the optional bypass loop if that plumbing is used. Franklin Electric recommends that
all system check valves be spring-loaded to provide best system performance. Be sure
to check all local plumbing codes to ensure that all requirements pertaining to backflow
prevention are met.
s
WARNING WARNING
!
5. Install the pressure sensors at the pressure tank tee downstream of the pressure tank. (The
pressure tank should be between the pressure sensor and the pump.) The pressure sensor
has a 1/4-18 National Pipe Thread (NPT) connection. The pressure sensor should not be
installed in an inverted orientation (upside down). Make sure the pressure sensor and tank
are not located more than 5 feet off the main piping.
6. Install a pressure relief valve downstream of the check valve. The discharge must be
plumbed to a drain rated for maximum pump output at relief pressure setting.
Electrical Diagram
Inline Constant Pressure System
Failure to install check valves properly may prevent the pump
from shutting off. FAILURE TO FOLLOW THIS WARNING may
result in heating of water, personal injury, pump damage, and/or
property damage.
Inline Systems can develop
WA R N I N G
very high pressure in some
situations. Always install a
pressure relief valve able to
pass full pump flow at 100
psi (6.9 bar). Install the
pressure relief valve near the
pressure tank.
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