System information

16
Geothermal Applications
Carrier: Turn to the Experts.
Integrated Variable-Speed Water Flow Control
Employing the Two-Way Communicating System, the GT-
PC (50YG), GT-PB (50YF) and GT-PCS (50YGS/50YGP)
Digital series utilize an Integrated Variable-Speed Water Flow
Control. This technology is built inside the unit with intelligent
variable speed components, controlled directly by the DXM2
control based on information from the pump (or motorized
water valve) and sensors across the system.
Integrated Variable-Speed Water Flow Control delivers three
main benefi ts:
1) Easier and quicker install as the fl ow control is built in to
the unit
2) Superior reliability by varying the water fl ow to deliver
stable operation
3) Higher cost savings by slowing down the fl ow (and pump
watt consumption) to match the unit’s mode of operation.
Internal components
GT-PC (50YG), GT-PB (50YF) and GT-PCS (50YGS/50YGP)
can be installed more easily and compactly than their
predecessors by building water-fl ow components internal to
the unit. This saves installing contractors labor and time by
eliminating the need to install a bulky external fl ow regulator
or pumping module.
Variable fl ow
Integrated Variable-Speed Water Flow Control technology
enables variable water fl ow through the unit, with the DXM2
control maintaining entering and leaving water ∆T. Refrigerant
pressures are maintained at levels closer to optimal by
precisely managing the water fl ow and thus indirectly the
heat of extraction and rejection.
Integrated Variable-Speed Water Flow Control is available for
three applications:
1) Closed loop – individual unit pumping: Integrated
Variable-Speed Water Flow Control Internal Flow
Controller model would be used. This includes variable
speed pump, fl ushing ports, 3 way fl ushing valves and
expansion tank. Copper water coil is standard with this
option.
2) *Closed loop – multi unit / central pumping: Integrated
Variable-Speed Water Flow Control Internal Motorized
Modulating Valve would be used. Copper water coil is
standard with this option.
3) *Open loop: Integrated Variable-Speed Water Flow
Control Internal Motorized Modulating Valve would be
used. Cupro-Nickel water coil is standard with this option.
Valves in open loop models have higher pressure drop
than the valves in the closed loop (modulating valve)
models for better fl ow control when used in systems
with higher pressure water supply pumps, and are not
recommended for closed loop applications.
*Not available on 50YGP Outdoor Split
Energy Savings with water circulation
Units with Integrated Variable-Speed Water Flow Control
technology deliver higher operating cost savings by varying
the water fl ow to match the unit’s operation (ex: slows down
when unit is in 1st stage). Reducing the fl ow results in
lower energy consumption by the water pump (=higher cost
savings) in Integrated Variable-Speed Water Flow Control
units (with pump either inside the unit or outside the unit).
Specifi cally, units with Integrated Variable-Speed Water Flow
Control technology with INTERNAL ECM/Variable speed
pump consume fewer watts than a PSC/fi xed speed pump,
even at full speed / load. When demand and load are lower
(ex: 1st stage), the ECM pump slows down to consume less
than 50% of the watts compared to its PSC counterpart. On
average, the savings can be over 60 watts/ton by using the
ECM pump vs. a fi xed speed PSC pump.
193
74
430
Pump
Watts
3 Ton
System
4 Ton
System
External
Pump
96
448
141
5 Ton
System
Integrated Variable-Speed
Water Flow Control
Integrated Variable-Speed Water Flow Control
Variable speed pump or motorized modulating valve
delivers variable water-fl ow, controlled by DXM2 control,
based on entering/leaving water ∆T.