Instructions
EZ Boost
TM
System
1
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 regula-
tions 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 perform-
ance 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 pres-
sure 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 pres-
sure 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 pres-
sure. 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 com-
munication. 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 paral-
lel 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
