Bryant TSTATBBN2S01-C Manual de Instalação descarregar pdf (Página 11)

Page 11

Shut-off Valve with Waste

Vent at high point

Cold Inlet

Hot Outlet

to home

Insulated water lines -

5/8” OD 50 ft maximum

Powered

Water

Heater

Upper

element to

120 - 130°F

Lower

element to

100-110°F

Domestic

Cold Supply

Tee and drain

Shut-off Valve

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.

All heat pumps equipped with the HWG option include a

built-in water to refrigerant heat exchanger to eliminate

the need to open and tie into the heat pumpʼs refrigerant

circuit in the ﬁ eld. The control circuit is also built in.

Figure 14 is a typical example of HWG water piping

connections on an GT-X unit with a built-in pump. Using

a concentric or coaxial hot water tank connection ﬁ tting

eliminates the need to tie into the hot water tank cold

water piping (See Figure 16).

Typically a single tank of at least 52 gallons 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 desuperheater. Using a concentric hot water

tank connection ﬁ tting eliminates the need to tie into

the hot water tank water piping. In high liming areas

(hardness>100ppm or 6 grains per gallon) the alternative

piping scheme in Figure 16 may be used to eliminate the

possible scaling of the smaller cross-sectioned area of

the concentric ﬁ tting. It is always advisable to use water

softening equipment on domestic well water systems

to reduce the liming potential and lengthen equipment

life. In extreme water conditions, it may be wise to not

use the HWG option since the probable cost of frequent

maintenance may offset or exceed any savings.

Installation

The HWG aquastat is set at 125°F and is located on the

HWG heat exchanger “Water In” line. If the HWG is

connected incorrectly or if circulation is reversed, the

aquastat will sense leaving water temperature and prevent

HWG operation. UNDER NO CIRCUMSTANCES

DISCONNECT OR REMOVE THE HWG AQUASTAT!

Full load conditions could drive hot water tank

temperatures far above desirable temperature levels if the

aquastat has been disconnected or removed.

The heat pump, water piping, pump, and hot water tank

should be located where the ambient temperature does not

fall below 50°F. Keep water piping lengths at a minimum

– DO NOT use a one way length greater than 50 feet.

All installations must be made in accordance with local

codes. The installer is responsible for knowing the local

requirements, and for performing the installation accordingly.

Figure 14. Typical GT-X HWG Installation

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