Bell & Gossett S14141B 70X Multiple Pump Pressure Booster Systems - Manual (Page 2)

UNIT IDENTIFICATION
The unit nameplate gives identification and rating information
as identified in Figure 1.
UNIT IDENTIFICATION
Records for this unit are kept by the order number (Q______)
and it must therefore be used with all correspondence and
spare parts orders.
PRESSURE BOOSTER SYSTEM
PREFACE
The 70X modular variable speed pressure booster system is
designed to maintain a constant discharge pressure while
minimizing power consumption by combining a variable
speed lead pump with one or two constant speed lag pumps.
This system creates an efficient and practical solution to a
building’s low demand water usage profile. A typical building’s
water demand varies throughout the course of a day and
often a single pump is capable of meeting the demand for
more than half of the day. The 70X controller manages pump
operation to match the wide range of pressure boosting sys-
tem conditions. The pump controller uses a combination of
kW, pressure and speed to calculate the most efficient points
to stage on and off pumps for operation.
PREFACE
Power consumption is minimized by varying the speed of the
lead pump to satisfy a varying system demand. As the system
demand exceeds the capacity of the lead pump, a constant
speed lag pump is staged on. The constant speed lag pump
operates at full capacity while the lead variable speed pump
adjusts its speed to supplement the system requirement.
When speed demand decreases the lead pump slows down.
While monitoring system pressure, pump speed and power
consumption, the constant speed lag pump is staged off at an
optimal point and the variable speed pump takes over.
FIGURE 1 - Technologic 500X Control Panel Nameplate
2