User Guide

4
Design Guide - HZH/HZV Series
THE HZ SERIES
As one of the highest efciency water-source heat
pump on the planet, the HZ Series raises the bar for
water-source heat pump efciencies, features and
application exibility. Not only does the HZ Series
far exceed ASHRAE 90.1 efciencies, but it also
uses EarthPure
®
(HFC-410A) zero ozone depletion
refrigerant, making it an extremely environmentally-
friendly option. HZ is eligible for additional LEED
®
(Leadership in Energy and Environmental Design)
points because of its “green” technology design.
Available in sizes 2 tons (7.0 kW) through 6 tons (19.3
kW) with multiple cabinet options (vertical upow,
vertical downow and horizontal) the units offer a
wide range of units for most any installation. The HZ
has an extended range refrigerant circuit, capable of
ground loop (geothermal) applications as well as water
loop (boiler-tower) applications. Standard features
are many. Copeland UltraTech™ two-stage unloading
scroll compressor, ECM variable communicating
fan motor, communicating microprocessor controls,
galvanized steel cabinet, polyester powder coat
paint, stainless steel drain pan and foil-backed air
handler insulation are just some of the features of the
innovative HZ Series.
Comfort-Aire/Century’s exclusive double isolation
compressor mounting system makes the HZ one
of the quietest units on the market. Compressors
are mounted on specially engineered sound tested
EPDM grommets to a heavy gauge mounting plate,
which is then isolated from the cabinet base with
rubber grommets for maximized vibration/sound
attenuation. User friendly installation and maintenance
are provided by the multiple removable access panels
and easy access control box. Options such as DDC
controls, internal variable speed pumps, modulating
water valves, and high efciency MERV rated air lters
allow customized design solutions.
iGate
®
technology is the next generation in intelligent
control by using two-way communication to provide
a gateway into the system. The iGate
®
control system
allows end-users and contractors to monitor the
performance of the unit, custom tailor its operation,
and diagnose any issues, right from the thermostat.
Unit Features
The iGate
®
communications hub is the DXM2
intelligent controller, which analyzes the status of
sensors and smart components (which are also
two-way communicating) to determine how best to
operate the system for optimal comfort, efciency
and long-term reliability. All of this information is
passed to the iGate
®
thermostat (or diagnostic tool),
where it can be displayed in plain English. And since
communication is both ways, the iGate
®
thermostat
can also be used to congure and tailor the system
without even touching the unit.
vFlow
®
variable water ow technology represents a
major advance in geothermal system performance
made possible through the iGate
®
system. vFlow
®
not
only builds the major water circulation components
into the unit for a clean installation, it also intelligently
varies the water ow to minimize pump energy
consumption and improve system reliability.
The heart of vFlow
®
is either a variable-speed pump
(for ground loops) or modulating water valve (for
ground water or central variable speed pumps)
directly linked into the iGate
®
system. Water ow
is automatically varied based on changes in unit
capacity level (stage) and source water temperature
to maintain optimum system performance. vFlow
®
allows the use of direct return piping, while
eliminating external two-ways valves and automatic
ow regulators. vFlow
®
systems are inherently self-
balancing.
vFlow
®
systems provide reduced water pumping
power compared to traditional xed-speed
pumping and protects the unit against extreme
operating conditions, extending the life of the
compressor and air coil. Since vFlow
®
is built
inside the unit, it also saves on installation
time and makes for a very clean and compact
installation. The HZ Series water-source heat
pumps are designed to meet the challenges of
today’s HVAC demands with one of the most
innovative products available on the market.