ClimateMaster DC Series Installation Manual download pdf (Page 13)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

climatemaster.com

Unit Power

Disconnect

Flow

Controller

Insulated

Hose Kit

P/T Plugs

Thermostat

Wiring

ASP30 Air Pad or

Extruded polystyrene

insulation board

Rev.: 06/10/05D

Do not install bricks or

blocks under air pad.

Figure 12: Typical Ground-Loop Application

Ground-Loop Heat Pump Applications

GROUND-WATER HEAT PUMP APPLICATIONS

Open Loop - Ground Water Systems

Typical open loop piping is shown in Figure 13. Shut off

valves should be included for ease of servicing. Boiler drains

or other valves should be “tee’d” into the lines to allow acid

ﬂ ushing of the heat exchanger. Shut off valves should be

positioned to allow ﬂ ow through the coax via the boiler drains

without allowing ﬂ ow into the piping system. P/T plugs

should be used so that pressure drop and temperature can

be measured. Piping materials should be limited to copper

or PVC SCH80. Note: Due to the pressure and temperature

extremes, PVC SCH40 is not recommended.

Water quantity should be plentiful and of good quality.

Consult table 3 for water quality guidelines. The unit can

be ordered with either a copper or cupro-nickel water

heat exchanger. Consult table 3 for recommendations.

Copper is recommended for closed loop systems and open

loop ground water systems that are not high in mineral

content or corrosiveness. In conditions anticipating heavy

scale formation or in brackish water, a cupro-nickel heat

exchanger is recommended. In ground water situations

where scaling could be heavy or where biological growth

such as iron bacteria will be present, an open loop system

is not recommended. Heat exchanger coils may over time

lose heat exchange capabilities due to build up of mineral

deposits. Heat exchangers must only be serviced by a

qualiﬁ ed technician, as acid and special pumping equipment

is required. Desuperheater coils can likewise become scaled

and possibly plugged. In areas with extremely hard water,

the owner should be informed that the heat exchanger

may require occasional acid ﬂ ushing. In some cases, the

desuperheater option should not be recommended due to

hard water conditions and additional maintenance required.

Water Quality Standards

Table 3 should be consulted for water quality requirements.

Scaling potential should be assessed using the pH/Calcium

hardness method. If the pH <7.5 and the Calcium hardness

is less than 100 ppm, scaling potential is low. If this method

yields numbers out of range of those listed, the Ryznar

Stability and Langelier Saturation indecies should be

calculated. Use the appropriate scaling surface temperature

for the application, 150°F [66°C] for direct use (well water/

open loop) and DHW (desuperheater); 90°F [32°F] for

indirect use. A monitoring plan should be implemented in

these probable scaling situations. Other water quality issues

such as iron fouling, corrosion prevention and erosion and

clogging should be referenced in Table 3.

Expansion Tank and Pump

Use a closed, bladder-type expansion tank to minimize

mineral formation due to air exposure. The expansion tank

should be sized to provide at least one minute continuous

run time of the pump using its drawdown capacity rating to

prevent pump short cycling. Discharge water from the unit

is not contaminated in any manner and can be disposed

of in various ways, depending on local building codes (e.g.

recharge well, storm sewer, drain ﬁ eld, adjacent stream

or pond, etc.). Most local codes forbid the use of sanitary

sewer for disposal. Consult your local building and zoning

department to assure compliance in your area.

The pump should be sized to handle the home’s domestic

water load (typically 5-9 gpm [23-41 l/m]) plus the ﬂ ow rate

required for the heat pump. Pump sizing and expansion

tank must be chosen as complimentary items. For example,

an expansion tank that is too small can causing premature

pump failure due to short cycling. Variable speed pumping

Section 10 - Packaged IOM 13 4/24/09 3:16:50 PM

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ClimateMaster DC Series Installation Manual Page 13

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