Carrier 50HQ User Manual download pdf (Page 26)

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. Utilize Aquazone products to provide opti-

mal energy efficient solutions and adapt to the most chal-

lenging 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, this system should be

designed between 2.25 and 3 gpm per ton of cooling ca-

pacity. The system is comprised of highly efficient pack-

aged reverse cycle heat pump units interconnected by a

water loop. The water circuit serves as both a sink and

source for heat absorption and rejection and is designed

for entering water temperatures between 60 F and 90 F.

Within this temperature range units can heat or cool as re-

quired from the same water source. Transferring heat from

warm to cold spaces in the building, whenever they coex-

ist, conserves energy rather than creating new heat.

Refer to the Carrier Water Source Heat Pump Sys-

tem Design Guide for assistance with the design of water

loop systems. The guide includes a practical approach for

the latest and most current design recommendations

including:

• Product application including horizontal, vertical, con-

sole, rooftop and water-to-water applications.

• Ventilation methods and system design including energy

recovery.

• Acoustical considerations for different product types.

• Addressing indoor air quality (IAQ) issues such as con-

densate 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

controls.

• 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 utilize Aquazone units in ground water applications, ex-

tended range should be specified. This will provide factory-

installed insulation on the coaxial coil to prevent conden-

sate 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 — This system is used where ground

water is plentiful. In this application, ground water is

pumped through supply piping from the well to the building.

The water is then pumped back into the ground through a

discharge well as it leaves the building. An additional heat

exchanger is usually installed between the building water

piping system and the ground water piping system. This de-

sign limits the amount of piping and excavation required.

Aquazone units are provided with a standard TXV and

are rated to extremely low temperatures to self-adjust the

refrigeration circuit, therefore water regulating valves are

not required on open loop systems. To conserve water on

this type of system, a slow opening/closing solenoid valve

is recommended.

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. Piping is limited to the amount of pipe required to

get the water from the source to the unit.

NOTE: When utilizing Aquazone water source heat pumps

in ground loop systems, refer to design considerations in

the ground water system section.

Horizontal ground loop — This system is used when

adequate space is available and trenching can be easily ac-

complished. A series of parallel pipes are laid out in trench-

es 3 to 6 feet below the ground surface, and then back-

filled. Often, multiple pipes are used to maximize the heat

transfer capability of each trench. The amount of pipe and

the size of the ground loop field are based on ground

conditions, heating, and cooling requirements of the appli-

cation and system design.

50 SERIES

TYPE

SIZE (tons)

APPLICATION

50HQP,VQP Large Capacity

6-10 (HQP)

-25 (VQP)

Environmentally sound unit with Puron

refrigerant (R-410A) designed to handle

large zoned areas for all geothermal and

boiler/tower applications.

50PC Compact

-5

Compact WSHP with Puron refrigerant

(R-410A) for boiler/tower, ground water, or

ground loop systems.

50PS Premium

Efficiency

-6

Premium, ultra efficient unit with Puron

refrigerant (R-410A) for new boiler/tower,

ground water, or ground loop systems

50PEC High Efficiency

Console

-1

Efficient console unit with Puron refrigerant

(R-410A) and attractive design for finished

interior, under-window installations.

50PT Premium

Efficiency

2-6

Premium, ultra efficient 2-stage unit with

Puron refrigerant (R-410A) for new boiler/

tower, ground water, or ground loop

systems

50PSW Water-to-Water

3-28

Efficient unit with Puron refrigerant

(R-410A) serves as an alternative to pre-

heat or cool air. Unit can be used as a

stand-alone or supplemental boiler/chiller

in most hydronic heating applications. Also

conditions process fluids, lubricants, and

refrigerants.

50RTG Rooftop

3-20

Economical solution for indoor air quality

(IAQ) problems and tempering ventilation

air.

50VS Premium Effi-

ciency Vertical

Stack Heat Pump

to 3 Tons

Ultra efficient unit with environmentally

sound Puron refrigerant (R-410A) for

boiler/tower and geothermal applications

(condominiums, hotels, etc.). Stacked

design allows for common piping and sim-

plistic design.

Application data

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Carrier 50HQ User Manual Page 26

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