R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P B S e r i e s - 6 0 H z P u ro n
®
R e v : 4 A p r i l , 1 4
10
Integrated Variable Speed Water Flow Control Heat Pump Applications
Overview
Figure 12a: Typical Closed-Loop Application (with
Internal Flow Controller Shown)
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Internal Flow
Controller
Water In
Water Out
Figure 12b: Typical Open Loop Application (with Internal
Modulating Motorized Valve Shown)
For use on applications using external source for fl ow
Internal Motorized
Modulating Valve
Water Out
Shut Off
Ball Valves
for Isolation
Water In
Pressure
Tank
Optional
Filter
Boiler
Drains
Integrated Variable Speed Water Flow Control is a
revolutionary new, intelligent, and ef
fi
cient way to circulate
water (or water plus antifreeze) using INTERNAL, variable
water
fl
ow control. The factory-installed high-ef
fi
ciency
variable-speed pump uses 60%-80% less wattage than a
traditional
fi
xed speed pump. Integrated Variable Speed
Water Flow Control technology improves performance of the
unit by reducing the amount of energy required to optimize
the
fl
ow of water throughout a GHP System and also reduces
the space, cost, and labor required to install external water
fl
ow control mechanisms (
fl
ow controllers, solenoid and
fl
ow
control valves).
Integrated Variable Speed Water Flow Control Con
fi
gurations:
1)
Internal Flow Controller - For Closed
Loop Applications
This is the most common con
fi
guration for closed loops.
With this factory-installed standard option, the unit is
built with an Internal Variable Speed Pump and other
components to
fl
ush and operate the unit correctly
(including an expansion tank,
fl
ush ports and
fl
ushing
valves). The pump speed is controlled by the DXM2
control based on the difference in entering and leaving
water temperatures (
Δ
T). The Internal Flow Controller
pump includes an internal check valve for multiple unit
installations. A copper water coil is standard with this
option.
Note: Internal Flow Controllers are also very suitable
for multiple unit installations depending on pump
performance requirements.
2)
Internal Modulating Motorized Valve – For Large
Closed Loop Applications (external central pumping)
Primarily for use on multi-unit closed loop applications
with central pumping. With this factory-installed option,
the unit includes a low pressure drop modulating
motorized valve that is controlled by the DXM2
microprocessor control based on the difference in the
entering and leaving water temperatures (
Δ
T). A Copper
Water Coil is standard with this option. The modulating
valve in this option has a higher Cv than the open loop
option.
3)
Internal Modulating Motorized Valve - For Open
Loop Applications
For use on open loop applications. With this factory-
installed, standard option, the unit is built with an
internal modulating motorized valve controlled by
the Communicating DXM2 control board based on
entering and leaving water temperatures (
Δ
T). A low Cv
modulating motorized valve is used for this application to
provide more precise control against the higher system
pressure differential of open loop applications. A Cupro-
Nickel water coil comes standard with this option.
Details on these options are included in the following sections
on ground loop and ground water applications.
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