ClimateMaster DC Series Installation Manual download pdf (Page 16)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

Hot Water Generator

The HWG (Hot Water Generator) or desuperheater option

provides considerable operating cost savings by utilizing

excess heat energy from the heat pump to help satisfy

domestic hot water requirements. The HWG is active

throughout the year, providing virtually free hot water when

the heat pump operates in the cooling mode or hot water at

the COP of the heat pump during operation in the heating

mode. Actual HWG water heating capacities are provided in

the appropriate heat pump performance data.

Heat pumps equipped with the HWG option include a built-

in water to refrigerant heat exchanger that eliminates the

need to tie into the heat pump refrigerant circuit in the ﬁ eld.

The control circuit and pump are also built in for residential

equipment. Figure 14 shows a typical example of HWG

water piping connections on a unit with built-in pump. This

piping layout minimizes scaling potential.

Electric water heaters are recommended. If a gas, propane,

or oil water heater is used, a second preheat tank must be

installed (Figure 15). If the electric water heater has only a

single center element, the dual tank system is recommended

to insure a usable entering water temperature for the HWG.

Typically a single tank of at least 52 gallons (235 liters) is used

to limit installation costs and space. However, a dual tank, as

shown in Figure 15, is the most efﬁ cient system, providing the

maximum storage and temperate source water to the HWG.

It is always advisable to use water softening equipment on

domestic water systems to reduce the scaling potential and

lengthen equipment life. In extreme water conditions, it may

be necessary to avoid the use of the HWG option since the

potential cost of frequent maintenance may offset or exceed

any savings.

Consult Table 3 for scaling potential tests.

R-410 systems inherently have a lower hot gas temperature

Shut-off Valve #2

Cold Inlet

Hot Outlet

to home

Insulated water lines -

5/8” OD, 50 ft maximum

Powered

Water

Heater

Upper

element to

120 - 130°F

[49 - 54°C]

Lower

element to

100 - 110°F

[38 - 43°C]

Domestic

Cold Supply

Tee and drain

Shut-off Valve #3

[16mm OD, 15 meters maximum]

Shut-off Valve #

Shut-off

Valve #4

than R-22 systems because the equipment is more efﬁ cient

(i.e. less waste heat is available). It is possible that energy

could be transferred from the water heater to the hot gas line

instead of from the hot gas line to the water heater during

certain times of the year. To prevent this from occuring,

a temperature switch will deactivate the pump at those

conditions that typically occur in the cooling mode with

entering water temperatures of less than 50°F [10°C].

Figure 14: Typical HWG Installation

Shut Off Valve #2

Insulated water lines - 5/8” OD, 50 ft maximum

[16mm OD, 15 meters maximum]

Upper element to 130°F [54°C]

(or owner preference)

Cold Inlet

Hot Outlet to

house

Powered

Water Heater

Cold Inlet from

Domestic supply

Hot Outlet

Unpowered

Water Heater

Field Supplied 3/4” brass nipple and “T”

Lower element to 120°F [49°C]

Shut-off

Valve #1

Shut-off

Valve #4

Shut-off

Valve #3

Figure 15: HWG Double Tank In stal la tion

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

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 49 50

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ClimateMaster DC Series Installation Manual Page 16

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