I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
14
W A T E R - S O U R C E H E A T P U M P S
JE-Series
I s s u e D a t e :
M a y 1 0 , 2 0 2 1
Variable Water Flow Heat Pump Applications Overview
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Internal Motorized
Modulating Valve
Water Out
Shut Off
Ball Valves
for Isolation
Water In
Pressure
Tank
Optional
Filter
Boiler
Drains
Typical Closed-Loop Application (with Internal Variable
Pump Shown)
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Internal Variable
Pump
Water In
Water Out
Typical Open Loop Application (with Internal
Modulating Motorized Valve Shown)
For use on applications using external source for flow.
Variable water flow is a revolutionary new, intelligent, and
efficient way to circulate water (or water plus antifreeze)
using internal, variable speed water flow control. The
factory installed high efficiency variable speed pump
uses almost half the wattage of traditional fixed speed
pump. Variable water flow technology improves the
life expectancy of the unit by reducing the amount of
energy required to optimize the flow of water throughout
the system and also reduces the space, cost, and labor
required to install external water flow control mechanisms
(flow controllers, solenoid and flow control valves).
Variable Water Flow Configurations:
1. Low System Pressure Drop Modulating Motorized
Valve – Typical for External Central Pumping.
Primarily for use on multi-unit applications with central
pumping. With this option the unit includes a low
pressure drop, high Cv modulating motorized water
valve that is controlled by the DXM2 control based
on the difference in the entering and leaving water
temperature delta T. This valve is a standard factory
installed feature for the JE unit.
2. High System Pressure Drop Modulating Motorized
Valve – Typical for High Pressure Water System
such as Water Well Pumps.
With this option the unit includes a high pressure
drop modulating water valve that is controlled by the
DXM2 control based on the difference in the entering
and leaving water temperature delta T. A low Cv valve
is used to provide more precise control against high
system pressure differential type of loops. This valve
is a factory installed option for the JE unit and when
selected replaces the modulating valve.
3. Standard Head Variable Pump – Typical for Multiple
Unit Central Pumping.
With this option the unit includes an internal variable
speed pump that is best suited to low pressure drop
systems such as primary/secondary pumping. The
pump speed is controlled by the DXM2 control based
on the difference in the entering and leaving water
temperature delta T. This pump can be selected with
an internal check valve for multiple unit installations.
This pump is a factory installed option for the JE unit
and when selected replaces the modulating valve.
4. High Head Variable Pump – Typical for Individual
Unit Pumping.
With this option the unit includes an internal variable
speed pump that is capable of higher system pressure
drops. The pump speed is controlled by the DXM2
control based on the difference in the entering and
leaving water temperature delta T. This pump can be
selected with an internal check valve for multiple unit
installations. This pump is a factory installed option for
the JE unit and when selected replaces the modulating
valve.
Variable speed pump or motorized modulating valve delivers variable
water-flow, controlled by DXM2 control, based on loop water delta T.
