Carrier AQUAZONE 50KQL-1PD - Manual (Page 22)

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Aquazone™ water source heat pump products are available
in a flexible, efficient array of models, which can be used in
all types of water loop, ground water, and ground loop
type systems. Use Aquazone products to provide optimal
energy efficient solutions and adapt to the most challeng-
ing design requirements.
AQUAZONE PRODUCT GUIDE
Water loop system
Water loop (or boiler/tower) system applications typically
include a number of units plumbed to a common piping
system. For optimal performance, design this system be-
tween 2.25 and 3 gpm per ton of cooling capacity. The
system is comprised of highly efficient packaged reverse
cycle heat pump units interconnected by a water loop. The
water circuit serves as both a sink and source for heat ab-
sorption and rejection and is designed for entering water
temperatures between 60 F and 90 F. Within this temper-
ature range, units can heat or cool from the same water
source. Transferring heat from warm to cold spaces in the
building, whenever they coexist, conserves energy rather
than creating new heat.
Refer to the Carrier Water Source Heat Pump Sys-
tem Design Guide for assistance designing water loop
systems. The guide includes a practical approach for the
latest and most current design recommendations including:
• Horizontal, vertical, console, rooftop and water-to-
water product applications.
• Ventilation methods and system design including energy
recovery.
• Acoustical considerations for different product types.
• Addressing IAQ issues such as condensate removal,
humidity control.
• Air distribution design including diffuser selection/
layout and ductwork design.
• Hydronic system design including pipe sizing/layout
and boiler/tower sizing.
• Control configurations such as stand alone, DDC, DCV,
and VVT®.
• WSHP efficiency/operational cost comparison chart.
• System variations such as a system without a boiler,
variable pumping, and VAV for interior use.
Ground water systems
To use Aquazone units in ground water applications, you
should specify extended range. This will provide factory-
installed coaxial coil insulation to prevent condensate from
dripping when entering water temperatures are below
60 F. In addition, the copper coaxial coil installed on the
Aquazone units may not be suitable for all water condi-
tions. Refer to the Water Conditioning section for proper
coaxial coil material selection.
Surface water system — This system is typically located
near a lake or pond. In this application, the loop can be
submerged in a series of coils beneath the water surface.
The number of coils required depends on system load and
design. This application requires minimum piping and
excavation.
Open loop system — Use this system where ground
water is plentiful. In this application, ground water is
pumped through supply piping from the well to the build-
ing. The water is then pumped back into the ground
through a discharge well as it leaves the building. An addi-
tional heat exchanger is usually installed between the build-
ing water piping system and the ground water piping sys-
tem. This design limits piping and excavation.
Aquazone units include a standard TXV and are rated to
extremely low temperatures to self-adjust the refrigeration
circuit. Therefore, open loop systems do not require water
regulating valves. Use a slow opening/closing solenoid
valve to conserve water.
Ground loop systems
There are many commonly specified designs for ground
loop applications. Typical designs include vertical loops
and horizontal loops. In some applications, water is piped
from the ground or lake directly to the water source heat
pump. This system only requires piping to get the water
from the source to the unit.
NOTE: When utilizing Aquazone water source heat pumps
in ground loop systems, refer to the design considerations
in the ground water system section.
Horizontal ground loop — Use this system when ade-
quate space is available and trenching can be easily accom-
plished. A series of parallel pipes are laid out in trenches 3
to 6 feet below the ground surface, and then back-filled.
Often, multiple pipes are used to maximize each trench’s
heat transfer capability. Ground conditions, heating and
cooling requirements, and system design determine piping
requirements and ground loop field size.
Vertical ground loop — Use this system in vertical bore-
hole applications. This design is well suited for retrofit
applications when space is limited or where landscaping is
already complete and minimum site disruption is desired.
The vertical ground loop system contains a single loop of
pipe inserted into a hole. The hole is back-filled and
grouted after the pipe is inserted. The completed loop is
50 SERIES
TYPE
SIZE (tons)
APPLICATION
50RHC,RVC
Horizontal/Vertical
Standard
Efficiency
1 /
2
-5
Efficient, compact, low cost
alternative for retrofit or new
boiler/tower systems.
50RHR,RVR
Horizontal/Vertical
High
Efficiency
1 /
2
-5
Efficient, adaptable unit for
new boiler/tower, ground
water, or ground loop systems.
50RHS,RVS
Horizontal/Vertical
Premium
Efficiency
1 1 /
4
-6
Premium, ultra efficient unit for
new boiler/tower, ground
water, or ground loop systems
50HQ,VQ
Horizontal/Vertical
Large Capacity
6 1 /
2
-25
Designed to handle large
zoned areas for all
applications.
50KQ
Console
1 / 2 -1 1 / 2
Attractive design for finished
interior, under-window
installations.
50RTG
Rooftop
3-20
Economical solution for IAQ
problems and tempering
ventilation air.
50RWS
Water-to-
Water
3-30
Used to pre-heat or cool
air and can be used as a
stand-alone or supplemental
boiler/chiller in most hydronic
heating applications. Also
conditions process fluids,
lubricants and refrigerants.
Application data