Specifications

9
GT-PCS Split Units - 60Hz Puron
®
Created: 29 Aug., 2013
Integrated Variable-Speed Water Flow Control
Heat Pump Applications Overview
Figure 4a: Typical Closed-Loop Application (with
Internal Flow Controller Shown)
Figure 4b: Typical Open Loop Application (with Internal
Modulating Motorized Valve Shown)
For use on applications using external source for fl ow
 CAUTION! 
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth
coupled heat pump systems. Instructions are provided
to assist the contractor in installing trouble free ground
loops. These instructions are recommendations only.
State/provincial and local codes MUST be followed and
installation MUST conform to ALL applicable codes. It is
the responsibility of the installing contractor to determine
and comply with ALL applicable codes and regulations.
Vibration Isolation Pad
Internal Flow
Controller
Water In
Water Out
High and Low
Voltage Knockouts
To Thermostat
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
Integrated Variable-Speed Water Flow Control is a
revolutionary new, intelligent, and effi cient way to circulate
water (or water plus antifreeze) using INTERNAL, variable
water fl ow control. The factory-installed high-effi 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 Confi gurations:
1) Internal Flow Controller - For Closed
Loop Applications
This is the most common confi 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 (ΔT). 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 (ΔT). A Copper
Water Coil is standard with this option. The modulating
valve in this option has a higher Cv than the open loop
option. (50YGS Models only)
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 (ΔT). 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.
(50YGS Models only)
Details on these options are included in the following sections
on ground loop and ground water applications.