Page 14
The HWG (Hot Water Generator) 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 pro-
vided in the Add-on HWG literature.
The GT-S utilizes an add-on Hot Water Generator
module that ties into the hot gas line of the GT-S outdoor
unit. The HWG module is remotely mounted near the
water heater and includes a water to refrigerant heat
exchanger, pump and controls. Figure 13 is a typical
example of HWG water piping connections on a GT-S.
Using a concentric hot water tank connection fitting
Refrigeration Installation
Install the Add-On HWG kit using its installation
instructions. Locate the HWG as close to the water heater
as possible.
Unbraze the hot gas u-bend as shown in Figure 11. Take
care to avoid overheating components. Install the dual
1/2" lineset to the HWG. Maximum length should be 30
feet one way. Evacuate the lineset to 200 microns
through the hot gas valves inside the GT-S unit. Open the
valves up fully (CCW looking up from cap end). Check
the lineset for leaks. Pinch the bypass tubing as shown in
Figure 12 being careful not to damage the tubing. Verify
lineset tubing is completely insulated with a minimum 1/
2" thick closed cell and painted to prevent deterioration
of the insulation due to ultra violet light and weather.
Water Piping
Connect water piping as shown in Figure 13. 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.
HOT WATER GENERATOR
Figure 12. HWG Service Valve Detail
Figure 11. GT-S HWG Connection Detail
eliminates the need to tie into the hot water tank cold
water piping. Under 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.
Unbraze u-tube
Hot water generator service
valve assembly
(inside cabinet)
Hot Gas to Reversing Valve
Hot Gas from
Compressor
Field connection of Hot
Water lineset
Pinch off here after evacuating lineset
and opening valves
Open Valves CW Close valves
CCW as looking up from
underneath
Insulated line
set with UV
Paint
Add-On Hot Water Generator
with internal pump
Waste Vent
Coupling
Cold Inlet
Hot
Outlet
Water Heater
Coaxial
Fitting
Insulated lineset
enters structure
Insulated water lines
Figure 13. Typical GT-S HWG Installation
