Hot Water Generator - Carrier 50YER036 Installation, Operation And Maintenance Instructions

Gt-pw water-to-water series

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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.

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 field.

The control circuit and pump are also built in for residential

equipment. Figure 3 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 should

be considered (Figure 4). Also, 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.

Figure 3: Typical HWG Installation

Cold Inlet from

Domestic supply

Hot Outlet

to home

Shut-off

Valve #1

Shut-off

Valve #4

Upper

element to

120 - 130°F

Shut-off

Valve #3

[49 - 54°C]

Lower

element to

Powered

Water

100 - 110°F

Heater

[38 - 43°C]

Shut Off

Valve #2

Insulated water lines -

5/8" OD, 50 ft maximum (one way) meters

[16mm OD, 15 meters maximum]

W a t e r- t o - W a t e r ( 5 0 Y E R ) S e r i e s - P u r o n

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 4, is the most efficient 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.

HFC-410A systems inherently have a lower hot gas

temperature than R-22 systems because the equipment is

more efficient (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

occurring, a temperature switch will deactivate the pump

at those conditions that typically occur in the cooling mode

with low entering water temperatures.

Figure 4: HWG Double Tank Installation

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