Xylem Goulds ResiBoost RB111512, Instruction Manual

Page: 13 / 40

• Suction piping should be no smaller than the suction connection on the pump. Keep
suction piping as short and direct as possible. Avoid multiple elbows and unnecessary
fittings to minimize friction loss. Refer to the pump manual to ensure that the NPSHr is
maintained.
• To avoid air pockets, no part of the suction piping should be above the pump suction
connection. Suction piping should slope upward from the liquid source to the pump
suction.
• In cases where the water level is below the suction of the pump (lifting water), install a
check valve (foot valve) on the suction of the pump to make sure that the pump stays
primed.
– The ResiBoost Package configuration (with eHM pump) is supplied with a
multistage pump and NOT recommended for priming applications.
• Install a gate valve to allow maintenance of the controller and pump or of the pressure
tank.
• It is advisable to install a tap for use during commissioning of the system if there is not
already an outlet near the pump.
• The controller plus electric pump can be used to connect the system directly to the
municipal supply line or to take water from a primary water supply tank.
– If connecting to a municipal supply, follow the applicable provisions set by the
authorities having jurisdiction.
– If connecting to a municipal supply, install a bypass loop to allow servicing of the
pump and controller without turning off the municipal supply.
– It is advisable to install a pressure switch on the suction side for turning off the
pump if there is low pressure in the in-coming supply line. Protects against dry
running.
– If connecting to a primary water supply tank, it is advisable to install a float for
turning off the pump when there is no water. Protects against dry running. In this
application ResiBoost package with eHM model multistage pump must be installed
with minimum fittings to reduce suction losses.
• Refer to the instruction manual of the pump for further information.
4.3.1 Pressure tank installation
• A diaphragm tank must be installed on the discharge side of the controller (See
Components for correct installation on page 12). The tank that is included with the
assembled ResiBoost Package with eHM model is a 2 Liter tank. This tank is the
minimum size needed for stable operation in most applications. Some applications
may require a larger tank.
• Set the air pressure (pre-charge) in the tank with the tank empty of water. Pre-charge
must be adjusted to be 20 psi below the Pressure Setpoint (
SP
) based on 5 psi
pressure drop.
WARNING:
• Make sure the pressure tank can withstand the maximum pressure of the system.
• Install a pressure relief valve large enough to limit the system pressure below the
maximum working pressure of the tank and controller. Plumb the pressure relief valve
to a drain to prevent damage due to flooding.
4 Installation
ResiBoost INSTRUCTION MANUAL 11