Hot Water Generator - ClimateMaster Tranquility 30 Digital TE Series Installation, Operation & Maintenance Instructions Manual

The HWG (Hot Water Generator) or desuperheater option
provides considerable operating cost savings by utilizing
heat energy from the compressor discharge line 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 field. The control
circuit and pump are also built in for residential equipment.
Figure 21 shows a typical example of HWG water piping
connections on a unit with built-in circulating pump. This piping
layout prevents sludge/debris from the bottom of the tank
being pulled into the HWG pump.
The temperature set point of the HWG is field selectable to
125°F or 150°F. The 150°F set point allows more heat storage
from the HWG. For example, consider the amount of heat that
can be stored by the HWG when using the 125°F set point,
versus the amount of heat that can be generated by the HWG
when using the 150°F set point.
In a typical 50 gallon two-element electric water heater
the lower element should be turned down to 100°F, or the
lowest setting, to get the most from the HWG. The tank will
eventually stratify so that the lower 80% of the tank, or 40
gallons, becomes 100°F (controlled by the lower element).
The upper 20% of the tank, or 10 gallons, will be maintained
at 125°F (controlled by the upper element).
Using a 125°F set point, the HWG can heat the lower 40
gallons of water from 100°F to 125°F, providing up to 8,330
btu's of heat. Using the 150°F set point, the HWG can heat
the same 40 gallons of water from 100°F to 150°F and the
remaining 10 gallons of water from 125°F to 150°F, providing a
total of up to 18,743 btu's of heat, or more than twice as much
heat as when using the 125°F set point.
Electric water heaters are recommended. If a gas, propane,
or oil water heater is used, a second preheat tank must be
installed (Figure 22). 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 50 gallons (189 liters) is used
to limit installation costs and space. However, a dual tank, as
shown in Figure 22, is the preferred system, as it provides the
maximum storage and temperate source water to the HWG.
⚠
WARNING!
WARNING! A 150°F SETPOINT MAY LEAD TO
SCALDING OR BURNS. THE 150°F SETPOINT MUST
ONLY BE USED ON SYSTEMS THAT EMPLOY AN
APPROVED ANTI-SCALD VALVE.
Tranquility 30 Digital ( TE) Series IOM - 60Hz HFC-410A
®
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 5 for scaling potential tests.
Figure 21: Typical HWG Installation
Figure 22: HWG Double Tank Installation
⚠
c l i m a t e m a s t e r . c o m
R e v . : O c t o b e r 5 , 2 0 2 1

Hot Water Generator

Cold
Hot Outlet
Inlet
to home
Shut Off
Valve #1
Shut Off
Valve #4
Back Flow
Powered
Check Valve
Water
Shut-off
Heater
Valve #3
Manual
Shut Off
Air Vent
Valve #2
Field supplied 3/4' brass nipple and 'T'
Insulated water lines -
5/8" OD, 50 ft maximum (one way)
[16mm OD, 15 meters maximum]
Y-Strainer
Hot Outlet to
house
Cold Inlet
Cold Inlet from
Domestic supply
Hot Outlet
Upper element to 130°F [54°C]
Shut-off
Valve #1
Shut-off
Valve #4
Powered
Lower element to 120°F [49°C]
Water Heater
Back Flow
Check Valve
Unpowered
Water Heater
Shut-off
Valve #3
Manual
Air Vent
Shut Off
Valve #2
Y-Strainer
Field Supplied 3/4" brass nipple and "T"
Insulated water lines - 5/8" OD, 50 ft maximum (one way)
[16mm OD, 15 meters maximum]
Upper
element to
120 - 130°F
[49 - 54°C]
Lower
element to
100 - 110°F
[38 - 43°C]
(or owner preference)
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