Econergy THD3500 User manual
THD3500 HEAT PUMP WATER
HEATER INSTALLATION GUIDE
FOR QUALIFIED PERSONNEL ONLY
14072022
2
NOTE TO INSTALLERS:
Installation must be completed by qualified and licensed
Tradesmen to National Codes and in strict accordance with this
manual.
WARNING:
A pre– made CAT –5/6 cable is required for installation of Econergy
heat pumps
3
CONTENTS
Location of the Water Heater Unit ___________________________ 4
Installation Design _______________________________________ 5
Design to Avoid Cavitation ____________________________ 5
Distance from Hot Water Cylinder ______________________ 5
Wetback Systems________________________________________ 5
Solar Water Heating Systems ______________________________ 6
Ring Main Management ___________________________________ 6
Hot Water Cylinders ______________________________________ 7
New Construction ___________________________________ 8
Retrofit ___________________________________________ 8
Ordering Econergy Accessories_____________________________ 9
Installation ____________________________________________ 11
Typical Installation Detail _________________________________ 13
Installation Procedures___________________________________ 14
Mounting Systems _________________________________ 14
Pre-Wiring & Pre-Plumbing for Renovations & New Builds __ 15
Piping Diagrams ________________________________________ 16
Retrofit to Generic Single Inlet Hot Water Cylinder ________ 16
Retrofit to Coopers Ready Mains PressureWater Cylinder _ 17
Connection to Econergy HP Ready Hot Water Cylinder ____ 18
Piping Instructions ______________________________________ 19
Commissioning_________________________________________ 21
Troubleshooting ________________________________________ 23
Important Information ____________________________________ 26
Field Wiring Diagram ____________________________________ 27
Typical Heat Pump Ready Water Cylinder Product Specifications _ 28
Econergy HP Series Water Heater Specifications ______________ 30
Company Information____________________________________ 31
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LOCATION OF THE WATER HEATER UNIT
Econergy® water heater units are designed to be installed outside, in the ceiling
cavity (if one exists), under the house or in a garage, adjacent to the hot water
cylinder (HWC). The Econergy® water heater should not be located within living
areas as the unit produces cold air.
Location of the Econergy® water heater will be determined by a combination of
factors including proximity to the hot water cylinder, proximity to bedrooms and
whether there is usable space where the unit is going to be located.
For installation to existing homes, the unit should be installed with a maximum
insulated pipe run of 9 metres.
For new homes, the layout should be designed so that the unit can be installed as
close to the HWC as practical within the 9 metre maximum pipe run. The HWC can
be installed inside or outside but as close to main points of use as possible.
Econergy® Water Heaters must be installed in a well-ventilated
space outside the living areas
The Econergy® Water Heater emits 52 dbA at 1.5 metres
(THD3500) and should not be installed adjacent to bedrooms.
Ensure that the unit is located so that noise will not affect the
residents. The unit must be seismically restrained and located
away from bedrooms to avoid noise breakthrough.
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INSTALLATION DESIGN
Design to Avoid Cavitation
The installation must be designed so that the unit will operate reliably and with no
water flow issues due to cavitation.
Cavitation of the circulating pump may occur when there is less
than 50kPa pressure at the heat pump inlet. This can lead to a
malfunction of the Econergy® water heater and MUST BE AVOIDED
by ensuring adequate pressure at the system inlet.
To ensure successful operation of the Econergy® water heater on open vent
application where operating pressure is less than 50kPa (or 5m static head), a valve
vented system should be used. This has the added benefit of increasing the pressure
of supply in the house. The installer should be aware of and avoid adding a relief
valve to an old HWC of questionable structural integrity since it could cause the HWC
to fail.
Distance from Hot Water Cylinder
The Econergy® water heater should be mounted as close as possible to the HWC to
ensure best efficiency. This is because each leg of supply/ return piped water loses
its heat during the off-cycle despite being insulated. The cylinder should be located
within 9 metres of the Econergy® water heater for retrofit installations and directly
adjacent for new installations.
WETBACK SYSTEMS
The Econergy® system cannot be used with a wetback system
where the piping design allows a thermosyphon to develop
Wetback systems involve large bore copper pipes running into the cylinder and back
again. Because the heat source is uncontrolled, temperatures can rise to 100°C,
generating steam. Plumbing codes dictate that an open vent is used to eliminate the
possibility of an explosion occurring due to rapid pressure rise in the system.
Econergy® units can be combined with wetback systems but only with strict
constraints as the temperature limit on the Econergy® water heater is 80°C. The
Econergy® water heater unit must be mounted level with the hot water cylinder or
below, and the piping designed to eliminate a thermosyphon loop to stop the
possibility of over temperature hot water circulating from the cylinder to the unit.
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SOLAR WATER HEATING SYSTEMS
The Econergy® system cannot be used with a solar water heating
system where the piping design allows a thermosyphon loop to
develop
Solar water heating systems, like wetback systems, are usually uncontrolled
systems. Temperatures can rise to 100°C, boiling the water. As the Econergy®
system is super-efficient it would not normally be required to integrate the unit with a
solar water heating system, however if this was specified or required by the customer
then the piping design (as per wetback) must be designed to avoid thermo-syphoning
of high temperature water through the unit while not running.
RING MAIN MANAGEMENT (OPTIONAL)
A ring main should not be used on an Econergy cylinder setup without management
unless it is operated from a separate cylinder. Ring main management is a software
update that can be installed during production. A switch or PIR sensor(s) can be
wired to the heat pump and the heat pump will control the ring main circulation pump
(ring main pumps are not supplied as part of a typical Econergy system unless
specifically requested). Once the mechanism is triggered, the ring main pump will be
activated for 60 seconds to flood the ring main with hot water. A minimal amount of
hot water may be reintroduced back to the cylinder as a result. The ring main pump
will then be locked out for 30 minutes regardless of additional triggers.
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HOT WATER CYLINDERS
The Econergy® water heater requires a well-insulated hot water cylinder to function
correctly. The tank must be sized to the maximum anticipated draw off in an 8-hour
period so that the consumer does not run out of hot water. As a guide, we
recommend 300L for a family of 4. The water heater unit can be retrofitted to any
electric cylinder as long as it has PU or EPS insulation. Econergy® water heaters
cannot be installed into gas HWC’s as they are generally inefficient and there is no
electrical backup .
Econergy Heat Pump Ready HWC—Recommended Storage Sizes
Household Size
#Adults Recommended Size Ordering Code
2180L EC180L
3250L EC250L
4 – 6 300L EC300L
6+ / High Use 350L+ EC [capacity] L Custom
The Econergy cannot be retrofitted to gas hot water cylinders, or
any storage tank that cannot deliver more than 50kPa pressure to
the pump inlet.
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B) Retrofit
Retrofit can be made to any electric hot water cylinder with PU or EPS in good
condition by teeing into the cold-water line just before the tank isolation valve and by
fitting a tank outlet fitting (code HPTP) into the hot water outlet line. It is
recommended not to fit a pressure relief valve to an old LP cylinder as this could
cause leaks.
A) New Construction
We recommend Econergy® heat pump ready hot water cylinders. Available in mains
pressure stainless steel, these contain dual 20 mm inlet fittings, dedicated 20 mm
return fittings and dual sensors integrated into the tank. They are guaranteed from
the factory with a 10-year warranty. Use of Econergy® heat pump ready cylinders
avoids any potential warranty issues resulting from modification to fit sensor pockets.
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ORDERING ECONERGY ACCESSORIES
Part No. Application Picture
Tank Pocket
HPTP
Tank Pocket - For
retrofit to Rheem
Stainless Solar
Ready HWC
Condensate Fitting
PF0128-B
For outdoor
installations requiring
a condensate drain
Generic Retrofit Kit
HPGRK For retrofit to existing
hot water cylinders
Coopers Solar Ready
Retrofit Kit
HPCRK For retrofit to Coopers Solar
Ready Hot Water Cylinders
Dux/Rinnai Retrofit Kit
HPTSK
For retrofit to Dux
Proflow and Rinnai
Hotflow Hot Water
Cylinders (aka Tank
Sensor
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