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ENGLISH
OUTDOOR UNIT
OPERATION MANUAL
TANK UNIT OUTDOOR UNIT
TAW-270NH2A / RAW-25NH2A
TAW-270NH2A
MODEL
TANK UNIT
Instruction manual Page 1~26
To obtain the best performance, please read this instruction manual completely.
SANITARY HOT WATER HEAT PUMP
RAW-25NH2A
FRANÇAIS
DEUTSCH
SVENSKA
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Thank you for choosing a sanitary hot water heat pump from Hitachi. To obtain the optimum performance and
ensure years of trouble-free operation, please read through this instruction manual. After reading, be sure to keep
this manual conveniently available for future reference.
There are two systems for supplying power to the heat pump; a full-time power supply system and an
off-peak power supply system. Available functionality depends on your power contract. Further details are
provided below.
A: Full-time power supply
B: Off-peak power supply
Contents
Safety precautions O SAFETY PRECAUTIONS ...........................................................3-5
Preparation O Name of each part..........................................................................6
O Name and function of control panel ...............................................7
O Preparing for Operation .................................................................8
O Setting the current time (only when connected to a .......................9
full-time power supply)
O Setting hot water temperature ......................................................10
Operation O Standard Operation .....................................................................11
Instruction of each function
O Timer Function
– Sets the same mode every day .......................................12, 13
– Sets a different mode for each day .................................14, 15
O ECO Mode Function ....................................................................16
O Anti-bacteria Function .................................................................17
O Boost Function ............................................................................18
O Emergency Function ...................................................................19
Maintenance O Precautions during maintenance ................................................20
O Regular inspection and maintenance ..........................................20
O Monthly inspection and maintenance ..........................................20
O
Yearly inspection and maintenance ............................................21
O Power failure ...............................................................................22
O Suspension of the water supply ..................................................22
O When the unit will not be used for an extended period ...............22
O Installation .............................................................................23, 24
Troubleshooting O Sounds ........................................................................................25
O Operation .....................................................................................25
After-sales service O Call your sales agent immediately if any of the ...........................26
following symptoms occur
O Speci cations ..............................................................................26
Safety precaution
s
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ENGLISH
SAFETY PRECAUTION
PRECAUTIONS DURING INSTALLATION
CAUTION
To learn how to used the sanitary hot water heat pump correctly and prevent personal injury and damage to
property, the user must read through the “Safety Precautions” before operating the sanitary hot water heat pump.
Pay special attention to instructions preceded by the WARNING and CAUTION symbols.
Q Precautions in this manual
This manual uses the following signal words and symbols, which are categorized according to the degree of injury
or damage that could occur from incorrect use when signal words or instructions are ignored.
WARNING
CAUTION
This symbol indicates a potentially
hazardous situation, which if not avoided,
could result in death or serious injury.
This symbol indicates a potentially
hazardous situation, which if not avoided,
may result in minor injury (or property
damage).
Type and Degree of Injury and Damage
Pictorial Examples
Make sure to connect earth line
Indicates a prohibited action
Indicates a mandatory action
Q After reading the precautions, store the operation manual in a location where it can be easily accessed by anyone
using the unit.
WARNING
O Installation of the unit must be performed by the sales agent or other
authorized personnel
Installation by the user could lead to water leakage, electric shock hazards
or re.
O Connect the unit to ground
O Have your sales agent or other authorized personnel connect the unit
to ground
Ground connections must not be made to gas pipes, water pipes, lightning
rods or telephone ground connections.
An improperly made ground connection may cause damage or short-circuits
that could result in electrical shock and re.
O Do not modify the unit
Modi cations could lead to water leakage, breakdowns, electrical shocks and
re.
O Install an earth leakage circuit breaker
Failure to install an earth leakage circuit breaker may lead to an electric
shock hazard.
O Install a pressure-relief valve
Failure to install a pressure-relief valve may lead to tank damage.
O Provide proper drainage of water resulting from dehumidi cation
Drainage problems could cause water to drip from the outside unit and onto
furniture.
O Supply the unit with tap water (French hardness (Th) 15 to 20°F, PH7)
Do not use well water, water from a hot spring or ion exchanged water.
If the hardness of the water exceeds (TH) 25°F, install a demineralizer to
lower hardness to 15 – 20°F.
O Do not connect the unit to other than speci ed power source
Connecting the unit to an unspeci ed power source may cause overheating
and re.
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PRECAUTIONS DURING INSTALLATION
Handling and Maintenance
CAUTION
WARNING
O Check that the tank is securely installed
Otherwise, it could tip over in an earthquake causing personal injury.
Contact your sales agent if it is not securely installed.
O Check that the oor where the unit is installed is waterproof and has
proper drainage
Otherwise oors below may suffer damage from possible leakage.
Consult your sales agent for details.
O Do not set it up in the place where water in piping and the tank freezes
Poor insulation could cause pipe damage from freezing up which could result
in burn injuries and water leakage.
O Do not install the unit in a location where there is a risk of ammable
gas leaks
Flammable gas coming into contact with the unit could ignite and result in
a re.
O If you notice anything abnormal (burning smell, etc.), immediately stop
operation, turn the breaker off and contact your sales agent.
Continued operation under these conditions may result in damage, electric
shock or re.
O When a thunderstorm approaches, immediately stop operation and turn
the breaker off
A severe thunderstorm could lead to equipment damage.
O If the water will not boil or takes unexpectedly long to boil, a refrigerant
leak may have occurred and contact your sales agent.
The refrigerant used in this water heater is harmless. However, in the unlikely
event of a leak, refrigerant that comes into contact with the ame in a fan
heater, stove, gas cooker, etc. will generate a toxic substance. If you notice
an irritating odor, immediately turn the water heater off and open the windows
for ventilation, before contacting your sales agent.
O Use hot water from the heater mixed with cold water
The water from pump is otherwise so hot that it could cause burn injuries.
Please install thermostat type mixer tap.
O Do not block the inlet or outlet vents in the outdoor unit, or insert your
ngers or objects into the vents
You could injure yourself by coming into contact with the high-speed internal
fan or you could damage the unit. The performance of the unit may also drop.
O Do not use wire or conductors in place of the fuse in the circuit breaker
This could lead to damage or re.
O Do not disassemble the unit
Disassembly exposes you to the risk of electrical shock.
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ENGLISH
Handling and Maintenance
CAUTION
O Be sure to stop the unit and turn the breaker off before cleaning it
During operation, the internal fan rotates at high speed and coming into
contact with it will result in injury or damage.
O Fill up the tank before starting operation
Failure to ll up the tank will cause overheating and could result in damage.
O Drain the tank of water when it will not be used for an extended period
of time
The quality of water may change if it is left standing in the tank for a month
or longer.
O Check that the pressure-relief valve works
Using a faulty pressure-relief valve could damage the tank or result in water
leakage. If the valve is damaged, consult your sales agent.
O Do not use an outdoor mounting frame damaged from long use
The outdoor unit could tip over causing injury.
O Do not drink water from the tank unit directly
O Do not drain hot water unmixed
Hot water can cause injury and damage the drain pipes.
Mix it with cold water before draining.
O Do not touch the switch with wet hands
This may result in electric shock.
O Do not wash the unit with water and do not place vases lled with water
on top of it
This may result in electric shock or re from leaking electricity.
O Do not touch the water or pipe when draining the tank
You could suffer burn injuries.
O Do not touch the mixer tap when lling the tank with hot water
You could suffer burn injuries from the hot water.
O Do not touch the pressure-relief valve or the drain pipe when inspecting
the valve
You could suffer burn injuries from the hot water.
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TANK UNIT
OUTDOOR UNIT
PREPARATION
Hot water outlet (G 3/4"B)
Control panel
Leak water receiver
Cold water inlet (G 3/4")
Mg-Anode
When heating operation, drain or
defrosted water flows out from
outdoor unit.
Don’t close drain outlet portion in
chilly area so as not to freeze these.
CAUTION
Refrigerating pipe
Air inlet (back and left side)
Air outlet
Condensed water outlet
NAME OF EACH PART
Note:
– Mg-Anode should be changed yearly, it may loose its function
for corrosive protection if exceeds the time frame.
– It is recommended to replace the Mg-Anode every 1 year
depends on the quality of water.
– Type number for Mg-Anode is <SPX-WTA1>. Use this number
for ordering when wants to replace.
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ENGLISH
NAME AND FUNCTION OF CONTROL PANEL
7-segment LED indicator:
Indicates water temperature, time and
other information
(Refer to page 9-19)
Timer LED indicator:
Lights while timer is set
(Refer to page 12-15)
ECO button:
Sets/releases ECO mode
(Refer to page 16)
ECO LED indicator:
Lights in ECO mode
(Refer to page 16)
Heating operation LED indicator:
O Lights during heating operation.
O
Blinks during boost operation.
(Refer to page 11, 18)
START/STOP button:
Turns the unit on and off
(Refer to page 11)
Operation LED indicator:
O Lights during operation
(Refer to page 11)
O
Blinks during defrosting
(Refer to page 11)
Function button:
To change function mode when setting
(Refer to page 9-10, 12-17, 19)
Boost button:
Use to quickly reach boiling
temperature by operating the heater
pump at full power
(Refer to page 18)
Set button:
Con rms changes made to water
temperature, time and other settings
(Refer to page 9-10, 12-17)
Up button/Down button:
Changes water temperature, time
and other settings
(Refer to page 9-10, 12-17, 19)
Anti-bacteria LED indicator:
O Lights during Anti-bacteria setting
O Blinks during Anti-bacteria operation
(Refer to page 17)
Each push of the function button changes the
indications as shown below.
Current water temperature
Time
Day of the week
Hot water temperature setting
Timer setting
Anti-bacteria function setting
Each push of the button changes
the indications as shown below.
Timer 1 setting: day/operation mode
Timer 1 setting: start time
Timer 2 setting: day/operation mode
Timer 2 setting: start time
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1
2
3
4
5
PREPARING FOR OPERATION
O USE THE FOLLOWING STEPS TO START UP THE UNIT THE FIRST TIME OR WHEN IT HAS NOT BEEN
USED FOR EXTENDED PERIOD OF TIME.
FILLING UP THE TANK
Turn on the water tap and close the drain valve.
Turn on all connected mixer tap (hot water side).
It takes about 20 to 30 minutes to ll up the tank. Please keep all taps open for a while in order to clean
the tank and the drain pipes by running water.
Close all connected mixer taps (hot water side) and open all taps (cold water side).
Let the cold water run for awhile to clean out the tank.
Turn off all connected mixer taps.
Inspection
1
After lling the tank, check all pipe joints and the tank for leakage.
2
Check operation of the pressure-relief valve.
3
After heating water for the rst time, again check pipe joints and the tank for water leaks.
1
TURNING ON THE POWER
Turn on circuit breaker.
When the circuit breakers have been turn on, “-- : --”. will start to blink on the control panel of the tank unit.
CAUTION
Fill up the tank completely before turning the
power on.
Turning the power when the tank is empty will
overheat it and damage the unit.
In case that the electric power is supplied to both of tank unit and outdoor unit, please always turn on the
outdoor unit side rst.
If the tank side is turned on rst, it may fall into error mode of “E0 03” and the unit is unable to operate.
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