Sanden GS3-45HPA-US User manual

SandenHeatPump–InstallationManual
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Page title
Covering model numbers for residence
Heat Pump Unit GS3-45HPA-US


This appliance is not to be installed by unqualified and unlicensed
persons, please read and understand this manual prior to installing
and operating the unit.
※This manual is for TO BE USED
by the installing Contractor
only.

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Contents
Page title..............................................................................................................................1
Contents ..............................................................................................................................2
Introduction..........................................................................................................................3
How it works ........................................................................................................................3
Installation details................................................................................................................4
Installation location..............................................................................................................5
Heat pump Unit Installation..................................................................................................6
Water Piping Installation – Heat Pump Unit & Tank.............................................................7
Heat Pump Unit Water piping ..............................................................................................9
Mains Power/Electrical Installation ....................................................................................10
Electrical connections........................................................................................................10
How to connect Main Power..............................................................................................10
How to connect Tank thermistor cable to Heat Pump unit.................................................12
System operation using continuous Power Supply............................................................13
System operation if connected to Demand Response Power............................................13
Filling the System & Purging Air ........................................................................................15
Freeze protection...............................................................................................................16
Time setting.......................................................................................................................17
Controller Operation ..........................................................................................................19
Commissioning Mode ........................................................................................................19
How to switch to Commissioning Mode .............................................................................19
Error Codes .......................................................................................................................24
Water Supply Quality (Supplemental)................................................................................26
Change of water supply.....................................................................................................27
Technical data ...................................................................................................................28
Warranty Policy..................................................................................................................32
Warranty period.................................................................................................................33
Check sheet.......................................................................................................................34
Replace controller assembly..............................................................................................35
Memo.................................................................................................................................36
PATENTS
This water heater may be protected by one or more patents or registered designs
in the name of Sanden International (USA), Inc.
TRADE MARKS
® Registered trademark of Sanden International (USA), Inc.
Note: Every care has been taken to ensure accuracy in preparation of this publication.
No liability can be accepted for any consequences that may arise as a result of its application.

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Introduction
The Sanden SANCO₂Heat Pump Water Heater System has been designed using the
latest refrigeration technology to remove the heat from the air to heat water. The
refrigerant we use is CO
2
which does not contribute to global warming so it allows us to
help keep a clean healthy earth for future generations.
By using CO
2
as the refrigerant, we have produced one of the most energy efficient units
currently available. It is even more efficient when connected to demand response power
and the noise level is so low it will operate unobtrusively at any time.
How it works
The Sanden SANCO₂Heat Pump Water Heater System heats water by transferring the
heat from the surrounding air to the water using a refrigerant. The refrigerant is heated by
a heat exchanger that absorbs heat from the surrounding air (Figure 1).
Figure 1: Heat Pump Water Heater System
Note:
The unit must have a minimum of 5 hours continuous power available at all time to allow
the unit to operate without affecting reliability.

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Installation details
This Sanden SANCO₂Heat Pump Water Heater System must be installed by licensed
personnel in accordance with local building codes:
Installing contractor should be licensed by applicable state/province and municipal
authorities to install an Electrical & Plumbing product.
The unit has been designed for heating potable domestic hot water. Any other
usage, such as use for DHW in combination with space heating requires both a
heat exchanger suitable for local codes to be installed on the system to separate
potable and non-potable water and consultation with Sanden.
The unit is designed to operate when connected to the water supply with a
maximum operating pressure of 95PSI (655 kPa). To ensure the mains pressure
does not exceed this, first check incoming cold water mains pressure, and then a
pressure regulating device must be connected to the water supply line.
This system delivers hot water exceeding 120
o
F (50
o
C).
Installation of a temperature tempering device is MANDATORY to avoid potential
scalds and burns.
The unit must be stored and transported in an upright position. Failure to do so may
render the unit faulty. Such failure is not covered under any warranty agreements.
Failure to comply with the above conditions will void the warranty.
Figure 2: Typical installation layout

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Installation location
For the most efficient operation of the heat pump unit, the optimum location is the
warmest side of the property and there should be sufficient space for the air to
circulate through the unit.
The tank unit should be located as close as possible to the most frequently used
hot water outlet such as a bathroom. It may be located either outside or inside. The
heat pump unit must be located outside and as close as practicable to the tank unit
but not further than 50ft (15m) away from the tank.
Ensure sufficient clearance around the heat pump unit to allow air to circulate and
provide adequate space for service maintenance of the unit (Figure 3).
Although the heat pump unit is very quiet, it is preferable to avoid installing it
directly below a bedroom window.
Install the heat pump unit in an area which allows sufficient ventilation. Poor
ventilation may cause the unit to short cycle and this could increase power
consumption by more than 10%.
Do not install the heat pump unit in a confined space without making provision for
intake or exhaust airflow for the unit.
If the heat pump unit is installed facing a wall, exhaust air may stain the wall.
Figure 3: Restrictions on where the heat pump unit can be installed (overhead view)
※１ Unit should have a minimum of 18” or 500mm space above the unit to ensure correct operation
２ Discharge Air blowing against a wall/obstacle in front of the unit may stain the wall/obstacle
３ If the unit is not able to operate with adequate airflow due to obstacles and reduced clearances,
Then heating output will be reduced by approx. 10% and power consumption increased by approx.10%
４ For optimum operation install the unit per the above or in a location with no obstacles

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Figure 4: Restrictions on installation with the space between the tank unit and the
heat pump unit
Heat pump Unit Installation
The surface to which the heat pump unit is installed must be firm, preferably a
concrete pad or block. If the surface is firm there is no need to fix the unit to a base
surface, unless there is a likelihood of high wind or local vibration.
If the heat pump unit and tank unit are to fixed, appropriate fixing devices for the
weight/expected duty should be used. It is permissible to install the Heat Pump on
the side of a wall provide an adequate support is used.
Note: For California installation the Tank section water heater must be braced,
anchored, or strapped to avoid falling or moving during an earthquake. For Tank
size over 52 Gallons (236l) consult your local building jurisdiction for appropriate
bracing designs.
Note: For Florida installation the Heat Pump unit should be installed in accordance
with all local codes regarding Hurricane winds.
Use appropriately treated lumber or pre-fabricated “pump ups” to raise the Heat
Pump unit 4”-6” from the ground – this will allow defrost condensate to drain. In
areas with significant snowfall ensure unit is mounted above the anticipated
snowfall depth.
A Pressure Relief (PR) valve MUST be installed during the installation of the tank
unit. This is installed in a defined point near the top of the tank unit. The PR Valve
must have clear drainage where escaping steam or water can flow freely. PR Valve
setting should be 100 Psig.
The installation site must be well drained so that any water accumulating (such as
rain or pipe leakage) will drain away and not enter the heat pump unit and the tank
unit.
Supply water pressure must be a minimum of 29 PSI (200 kPa) to ensure Heat
Pump unit operation – If pressure is below 29 PSI install a booster pump to water
supply.
Caution
Keep the piping run to a minimum
as the longer the pipe run, the
greater the potential for heat loss
.
Side view
Overhead view
Standard layout
(A) Difference in height between
the base of tank and base o
f
Heat pump should be no more
than: 16ft(5
m) Max.
>24” or 600mm
(Minimum Separation
Maximum pipe length50ft (15m)pe
r
line between Tank & Heat Pump
Unit.
Maximum number of bends–6, use
long radius bends not street “L’s”
2”or
more
2”or
more

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Note:
The entire system is set up and fully functional when supplied. Once all the water and
electric connections have been made, the system will operate automatically provided that
mains power is available.
The only adjustments to the unit are to set the desired hot water supply temperature & set
the current time on the operation panel under the top housing cover, especially if the block
out time setting is desired. See Set point adjustment, current time setting, and block out
time section on page 19.
Figure 5: Heat pump installation example and dimensions
Attach the drain elbow to the drain opening located on the bottom of the heat pump
unit. The drain elbow is included in the installation kit for the heat pump unit.
Attach a drain hose with 5/8 inch (16mm) of inner diameter to the drain elbow to guide
the drained water to an appropriate drain.
Water Piping Installation – Heat Pump Unit & Tank
All piping that connects to the water supply must be installed by a licensed contractor.
The water supplied to the system must comply with the potable water quality standard.
Use of water that does not comply with this standard could result in a malfunction of
the system.

Description PH TDS (Total
Dissolved
Solids)
Total
Hardness
(calcium Ion
concentration)
Aluminium Chlorides Copper Iron Manganese Zinc
Maximum
Levels 6.0 to
9.0
Up to
500 ppm Up to 200ppm or
12 grains
hardness
Up to
0.2 ppm Up to 200
ppm
Up to
1.0
ppm
Up
to
0.3
ppm
Up to
0.05 ppm Up to 5
ppm
The water supply must have a pressure of 29 PSI (200 kPa) or higher.
A drain trap must be installed on the drain pipe if water is to be drained to a drain pan.

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This product cannot be connected to a solar water heater.
The piping must be insulated with ¾” to 1” closed cell insulation.
Self Regulating Heat tape (3-5W per foot) must be installed on both Water Lines to the
Heat Pump to protect the water piping in areas with freezing temperatures.
If the piping needs brazing, make sure that all flux and flux splatter is wiped away with
a wet cloth. When brazing, ensure connections are protected using a wet cloth.
As the hot-water supply pipe will expand and contract, use sleeves when penetrating
through concrete walls or slabs.
With buried piping, an outer cover will need to be used that has had both ends sealed
to avoid any ingress of rain.
Use only heat-resistant and corrosive-resistant material to seal the pipe joints.
Cutting and wrenching the piping material may result in oil and dust adhering to it. After
processing, clean the material with a mild detergent before doing any piping work and
smooth the edges to remove any scratches and burrs. (After flowing water through it
verify whether any debris has accumulated on the filter of the faucet and heat pump
unit pipe.)
When using PTFE sealing tape, ensure that no tape is sticking out of the threads.
Any heat-resistant PVC piping use is NOT recommended due to high outlet water
temperature for between the heat pump and the tank as well as the tank and the
mixing valve.
Follow the manufacturer’s instruction manual for the type of bond, amount to be
applied, curing time, and other specifications.
If any bond or flux has entered the tank unit and the hot water has a chemical/acrid
smell, take the following countermeasures.
a) After heating the water in the tank unit, drain it and clean inside the tank unit. Fill
the tank unit with 26 gallons (100 litres) of water and exchange twice.
b) Clean or change the filter.
c) Fill up the tank unit.
d) Drain water from the relief valve for one to two minutes.
e) Run water from all the hot water supply faucets in the house for about ten minutes
to clean inside the pipes.

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Heat Pump Unit Water piping
ALL PIPING BETWEEN HEAT PUMP & TANK SHOULD BE ½” NO EXCEPTIONS
Connect the heat pump unit COLD supply to the tank unit fitting marked Cold Supply. –
½” NPT Connection (Certain early units may use ½” BSP connections).
Connect the heat pump unit HOT return to the tank unit fitting marked Hot Return – ½”
NPT Connection (Certain early units may use ½” BSP connections).
Connect the mains water supply to the lower fitting on the tank unit marked Cold Water
Inlet.
Connect the hot water supply pipe to the top of the tank unit marked Hot Water Outlet.
Install the PR valve to the fitting on the tank unit marked PR valve, pipe from PR valve
directly to a Building drain; do not install any shut off valve between PR valve and
Building drain.
Run water through the pipe(s) to remove any debris inside before connecting the
pipe(s).
After all the piping connections are completed, run water through the system.
Remove the air from the system according to the instructions below on Page 15.
Make sure all the necessary devices are mounted to the pipes as shown in diagram.
If the heat pump unit piping is kinked or clogged or the air inside was not removed
during the test operation, temperature of the supplied hot water may become
inconsistent.
Figure 6: System piping (Typical System piping)

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Mains Power/Electrical Installation
All Electrical Wiring should be done in accordance with the latest edition of the
National Electrical Code (NEC) and all local State/Province and Municipality codes.
The power requirement for the system is a dedicated 15 amp circuit fitted with a
circuit breaker. This circuit may be connected to constant power or off-peak power.
A local disconnect should be installed adjacent to the Heat Pump unit in
accordance to NEC and local codes.
Installation of this system must be carried out only by a qualified installation
technician (electrical, HVAC or plumbing).
Electrical connections
Breaker size and wiring must be sized per NEC rules for the rating plate amperage,
MCA and MOP or Max Circuit Breaker.
Power Supply is 208/230V-1Ph-60Hz
Verify that the tank unit is full of water and the
water shut off valves are open before turning on the
power.
How to connect Main Power
Remove the terminal block cover (Philips head screwdriver required)
Connect the power wiring to the terminal block per the wiring diagram/manual.
Ensure ground wire is connected.
Secure the field power supply wiring below the terminal block with the screw clamp
fitting.
Re attach the terminal block cover to the heat pump unit.

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Figure 7: Main Power Connection

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How to connect Tank thermistor cable to Heat Pump unit
The thermistor cable and conduit length are provided to cover 16.5 feet between the
tank and the Heat Pump.
If the units are located closer, the thermistor cable and conduit may be cut to the
desired length (Figure 8).
If the units are further apart, the thermistor cable may be extended by connecting an
18-2 AWG Shielded wire to the existing thermistor cable – connections are not
polarity sensitive.
Attach the conduit connector to the conduit end. Push the conduit into the opening on
the connector until the conduit does not go any further. Pull the conduit several times
to ensure the connector is fixed properly to the conduit.
Unscrew and carefully remove the terminal block cover on the tank. Do not use
unnecessary force to remove the cover as this could pull and break the cable coming
out of the tank unit.
Attach the connector on the end of the thermistor conduit coming from the heat pump
unit side to the opening on the bottom of the cover on the tank unit.
Confirm the gasket is adhered to the thread of the conduit connector before attaching
the connector to the cover. If the gasket is not present, there is a risk of water getting
inside the cover and this may result in a malfunction of the terminal block.
Connect the thermistor cables to the bottom of the terminal block.
Replace the terminal block cover back onto the tank unit and tighten the screws.

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Figure 8: Connecting tank unit thermistor cable – GAUS Tanks shown as example
System operation using continuous Power Supply
If the block out time function is selected (setting is covered on Page 18) the unit will
not operate during the block out times – this function is typically used on
installations that have time of use electricity tariffs.
The water heating cycle operation starts automatically when the residual hot water
in the tank unit is less than 40 gallons (150 litres).
The system will not run if the electrical power supply is cut off. However, the system
will automatically start operation, once the electric power supply is restored.
System operation if connected to Demand Response Power
There are no special settings for the Demand Response. The system will run once
power becomes available and the temperature in the tank drops below the set point
of the tank thermistor.
If connecting the unit to Demand Response power ensure that the power supply
provides a minimum of 5 hours continuous power, as it can take at least four hours
to fill the tank unit with hot water.
If the ambient temperature is lower than 50
o
F (10
o
C) this can be longer.

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If the unit is connected to Demand Response power and hot water consumption has
been higher than normal, hot water might not be available until the next power
supply cycle.
 Daily frequency and amount of hot water consumption may also affect the duration
of the heating cycle operation.
Figure 9: Outline of electrical system connections
The basic system installation is now complete; the unit is
now ready for initial water filling, air purge and then start up
Check the Installation against the Installation Check list
provided at the end of this manual
Ensure that the work site is tidy; Sanden International recommends the use of Slim Duct or
Fortress product to cover water piping on the outside of the house.

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Filling the System & Purging Air
The following steps must be taken to ensure all air is removed from the system.
Incorrect purging of air may cause the water temperature to vary during operation, and
lead to possible error codes.
Ensure that all piping to tank unit and heat pump unit are installed and connections
are tight, then open the Cold Water Supply Valve to the system.
Push up the lever on the PR valve to open, and fill the tank unit with water.
Confirm that water comes out of the relief valve, and then close the lever.
Open the hot water faucets to remove air from the house piping system.
Close the faucets after no air is seen in the water.
Open the water drain plugs (two places) on the heat pump unit.
Close the plugs after no air is seen in the water or a steady stream of water is
present.
Supply power to the heat pump unit and leave the hot water faucets open for 3
minutes. Close the faucets after no air can be seen in the water.
Figure 10: Air removal process

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Freeze protection
Even if the water pipes have been insulated, the piping can freeze if the
surrounding temperature falls below freezing (32
o
F). This could cause damage to
the equipment and piping so make sure the appropriate freeze protection measures
are taken.
Follow the instructions in the installation manual provided with the freeze protection
heat tape.
After completion of the piping, inspect the plumbing for any water leaks from the
joints before installing freeze protection.
Wrap the freeze protection heater around the pipes, up to the water connectors of
the Heat Pump unit.
Ensure the freeze protection heaters are connected to a 24 hours continuous
power supply.
It is important to fully explain the use and operation of the freeze protection heater
to the customer.
When turning off the power, because the unit will not be in use, ALL water
must be drained from the unit and piping.
N
ote: Heat tape that uses the outside temperature to energize, may not maintain
the temperature of the pipes correctly. It is important to use a heat tape that
directly senses the pipe’s temperature.
Figure 11: Details on wrapping thermal insulation around the piping connector

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Unit Operation
Time setting
This product contains a built-in clock.
As part of the water heating cycle logic refers to the current time, it is necessary to set the
clock before starting to use the product. The current time can be set in the Clock Setting
Mode as described below.
Note:
There is no need to adjust the time setting for the daylight saving period. Even if the
installation is conducted during the daylight saving period, the clock setting to the ordinary
time (not daylight saving time) is preferable.
1. Switching to Clock Setting Mode
With the display reading 000X (X being the time elapsed from starting the unit)
Press the “Enter” key to switch to the Clock Setting Mode.
Time Display starts flashing once the mode is switched.
2. Setting the Clock
The time setting can be adjusted by pressing “Up” and “Down” keys. Fast forward
and rewind are available by pressing and holding down either the Up or Down key.
3. Confirming Time Setting
After the clock is adjusted to the current time, press the Enter key to confirm the
setting. The time display stops flashing once the setting is finished.
Caution
The setting automatically cancels when no panel operation is performed for more
than 60 seconds in the Clock Setting Mode. If this occurs, changes made will not be
reflected to the setting. If the clock setting is rewound to a time that is earlier than
the time when a heating cycle is triggered, the system will start the heating cycle.
Note: IF NO BUTTONS ARE PRESSED ON THE CONTROL PANEL FOR MORE THAN
60 SECONDS, THE DISPLAY GOES TO SLEEP AND THE PANEL IS BLANK
EXCEPT FOR THE OPERATION STATUS LIGHT
GREEN IS NORMAL, RED IS AN ERROR
SLEEP MODE IS TURNED OFF WHEN ANY BUTTON IS PRESSED (UP, DOWN
or ENTER).

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Figure 12: How to operate the controller

How to remove the operation panel
1. Remove Top Panel (4 screws)
2. Pull up Operation Panel
Pull up
Operation Panel
Operation Panel

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Commissioning Mode
Commissioning mode is a function to check the heat pump unit status and to check and
perform other settings. It should generally be assumed that the owner does not operate
this function. The following modes can be found in this mode.
Heat setting mode
Set the heating mode to either ON (Unit Runs) or OFF (Unit cannot operate)
Outlet water temperature setting mode
Set the Outlet Hot water temperature 130～175°F
Block out time setting mode (Time of use)
Set the block out time
Error history display mode
Check the history of any errors that may have occurred.
Parameter display mode
Check the values measured by the thermistors in the unit.
How to switch to Commissioning Mode
Press and hold down the Up and Down keys together to enter the Commissioning mode.
After the mode is selected, press the Enter key to select an option mode from the six
described above.
To exit Commissioning maintenance mode, either press and hold down the Enter key, or
do not touch the control panel for more than 60 seconds so it goes to sleep.

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Figure 13 Commissioning mode diagram

Heat Setting
Enter into Commissioning Mode
First option is the Heat Setting – Press Enter one more time to access this
Use UP/DOWN arrow keys to toggle between Heat On and Heat Off
Press Enter to confirm choice
To bypass the Heat Setting simply press the UP key to access the next parameter in the
Commissioning menu
Temperature Setting
Enter into Commissioning Mode
First option is the Heat Setting –
Press the UP Key to access Temperature Setting then Press Enter to access
Use UP/DOWN arrow keys to toggle between the various Temperature Settings
Press Enter to confirm choice
Settings available 130, 140, 150, 160, 165, 175°F
To bypass the Temperature setting simply press the UP key to access the next parameter
in the Commissioning menu
Display Sleep Mode
Clock Display Mode
Clock Setting Mode
Outlet water Temp Setting Mode
Block out Time Setting Mode
Heat Setting Mode
Error History Display Mode
UP
UP
UP
UP
Any Key
Enter
Enter
or
No Operation
for 60sec.
No Operation
for 60sec.
Hold down“UP”and
“DOWN”together
Press and
hold down Enter
or
No Operation
for 60sec.
Parameter Display Mode
“DOWN”is reverse
Enter
Enter
Enter
Enter
Enter
UP