Instructions
EZ Boost
TM
System
14
PRE-INSTALLATION
Before beginning installation procedures,
these installation and operating instructions
should be studied carefully. The installation
and operation should also be in accordance
with local regulations and accepted codes of
good practice.
The sound pressure level of the BMQE is <74 db[A] at a
distance of 3 feet (1 meter).
It is recommended by Grundfos
that the pump be installed with sound and vibration
dampening equipment such as; flexible piping adapters
and anti-vibration mounting. The pump should not be
mounted in or adjacent to living quarters. The pump can
also be wrapped with sound proofing insulation to reduce
noise. (See page 16, EZ Boost System Diagram.)
1. A guide to the EZ Boost System
The EZ Boost Constant Pressure System automatically
balances water surges and equalizes flow and pressure
according to consumption. In other words, the system
maintains a constant water pressure in spite of varying
water consumption. The pressure is registered by means of
the pressure sensor and transmitted to the controller. The
controller adjusts the EZ Boost BMQE pump performance
accordingly. The EZ Boost Constant Pressure System
features:
• Quick and easy installation: ready-to-use system
requiring minimum space
• High user convenience: constant pressure regardless of
water consumption
• Easily adjustable pressure level: push button control
• Continuous control and monitoring of pump operation
• Integrated dry-running protection
• Integrated overload protection
• Integrated protection against over voltage and under
voltage
• Soft start system
1.1 Function
When a tap is opened, the pressure in the tank will start
to drop. The system maintains a constant pressure within
the maximum pump performance in spite of varying water
consumption.
The pressure is registered by means of the pressure sensor,
which transmits a signal to the controller. The controller
adjusts the pump performance accordingly to maintain
constant pressure by changing the pump speed.
At low flow the pressure will drop slowly. When the
pressure in the tank is 7 PSI below the setpoint, the pump
will start. When the pressure is 7 PSI above the setpoint, the
pump will stop.
Even though the EZ Boost controller is controlling the
pressure within ±3 PSI, larger pressure variations may occur
in the system. If the consumption is suddenly changed, e.g.
if a tap is opened, the water must start flowing before
the pressure can be made constant again. Such dynamic
variations depend on the pipe work, but, typically, they
will lie between 7 and 14 PSI. If the desired consumption is
higher than the quantity the pump is able to deliver at the
desired pressure, the pressure follows the pump curve as
illustrated in the far right of fig. 1.
Fig. 1
At large flow rates, the pressure will drop quickly and
the pump will start immediately and maintain constant
pressure. When the system is running, the EZ Boost
controller makes small adjustments to the pressure to
detect whether there is consumption. If there is none,
the pump will simply refill the tank and stop after a few
seconds.
1.2 Power line communication
The communication between the EZ Boost controller
and the EZ Boost BMQE pump is via the power supply
cable. This communication principle is known as power
line communication. Using this principle means that
no additional cables to the pump are required. The
communication of data is effected by means of a high-
frequency signal transmitted to the power supply cable.
In situations where multiple EZ Boost BMQE pump power
cables are run parallel in wiring trays or conduit and
less than 12 inches apart, the possibility for undesired
communication between units exists.
When this occurs,
intermittent or continuous NO CONTACT is typically seen.
Other unexpected errors may also be seen.
There are two ways to eliminate the possibility of cross
communication:
Pressure
Flow
A
Stop
+7 PSI
Start
-7 PSI
Controlling
±3 PSI
Dynamic
variations
±7 PSI
GPM
0.8
A = Pressure setting
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