Mitsubishi Heavy Industries ESA30EH2 Series User manual

This user’s manual describes cautions for safety. Please read this manual carefully before use in order to
operate the unit properly.
Keep this manual, after reading, at a safe place where you can consult it whenever it is necessary.
When the ownership of the unit is changed, please be sure to transfer this manual and the “Installation
Manual” to a new owner.
It is not recommended for a user to install or move the unit by the user’s own discretion. (Safety or functions
may not be assured.)
The emission sound pressure level from the heat pump unit is under 70dB (A).
Thank you very much for your purchasing the heat pump water heater for com-
mercial use.
PJZ012A188B
202205
Air To Water Heat Pump
Natural refrigerant CO2 Water Heater ESA30EH2 series
This air to water heat pump complies with Machinery Directive 2006/42/EC, Low Voltage Directive 2014/35/EU, EMC Directive 2014/30/EU,
Pressure Equipment Directive 2014/68/EU, RoHS Directive 2011/65/EU, (EU) 2015/863, Ecodesign requirement Directive 2009/125/EC.
CE marking is applicable to the area of 50 Hz power supply.
USER’S MANUAL ORIGINAL INSTRUCTIONS

−2−

−1−
Contents
●
In order to protect the heat pump unit, be sure to
turn the power on at least 6 hours before starting
operation. (Supply the power to the crankcase
heater and warm up the compressor) And do not
turn the power off when stopping.
(During stopping of compressor, the crankcase
heater is kept energized for the compressor to be
kept warm in order to prevent compressor from
breakdown due to the migration of liquid refrigerant
in the compressor.)
●
If the ambient air temperature becomes below 0°
C, the water pipe may freeze.
It may cause break of the water pipe and the heat
pump unit.
Please consult with the dealer and take proper
measure for anti-freezing water.
If water may freeze, be sure to keep the power
turning on during Pause as well.
This unit has a function to start anti-freeze
operation during Pause, when water may freeze.
●
If do not use hot water for one month or more, be
sure to shut off the main power and drain off the
water in the heat pump unit and the unvented
cylinders.
When power failure happens and the water may
freeze, be sure to drain off immediately.
Regarding the way to drain off, please consult with
the installer or the dealer.
●
Warning: This appliance may deliver water at high
temperature refer to the plumbing code of Australia
(PCA), local requirements and installation
instructions to determine if additional delivery
temperature control is required.
Note
■
Before use …………………………………… 2
Safety Precautions ……………………………………………2
Component replacement guide for maintenance check and
preventive maintenance ……………………………………… 10
Water Quality Criteria ………………………………………… 11
General description of CO2heat pump water heater …………… 12
Description of functions and contents of CO2heat pump water
heater ……………………………………………………… 16
Names and functions of sections on the R/C…………………… 19
Screen flow ………………………………………………… 23
■
Operation method of basic operation …… 25
Hot water operation method ………………………………… 25
Space heating operation method ……………………………… 26
How to Run/Pause…………………………………………… 27
How to go to TOP screen …………………………………… 28
Setting of HW temp for the operation to top up ………………… 29
How to start heating operation………………………………… 30
How to set Heating temperature ……………………………… 31
Schedule setting …………………………………………… 32
How to set weekly schedule ………………………………… 33
How to set annual schedule ………………………………… 37
How to set day off …………………………………………… 39
How to set peak-cut ………………………………………… 41
How to do the [Operation to fill up] …………………………… 44
How to set to increase or decrease the hot water amount uniformly …45
How to set Silent mode ……………………………………… 46
How to set Legionella mode ………………………………… 49
Display hot water amount …………………………………… 51
Display of operation mode …………………………………… 51
■
Operation method for menu manipulation …52
Limited items for Sub remote control ………………………… 52
How to operate on the menu screen…………………………… 53
Notabilia for each setting screen ……………………………… 54
■
Operation method for various settings …55
How to set [Initial settings] …………………………………… 55
How to set Administrator settings……………………………… 59
How to check the remote control setting ……………………… 71
■
For maintenance ……………………………72
Maintenance of remote control, heat pump unit and hot water
storage unit, and components for space heating ……………… 72
Measure for anti-freezing water in winter ……………………… 73
When stopping the unit for long period.………………………… 73
When power failure occurs …………………………………… 73
■
When error happens ………………………74
■
Contact company……………………………78
■
Next service date ……………………………78
■
When [Periodical check] is displayed …79
■
After-sales service. …………………………79
Operation data ……………………………………………… 81
■
Specifications ………………………………82

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■
Before use
Safety Precautions
●
Please read the precautions written here carefully to operate the
unit properly. You are required to observe these fully because
every item of these instructions is important for safety.
WARNING
Failure to follow these instructions may result in
serious consequences such as death, severe
injury, etc.
CAUTION
Failure to follow these instructions may cause
injury, property damage or, serious consequences
depending on.
●
The following pictograms are used in the text.
Never do. Always follow the
instructions given.
Be sure to ground the unit. Absolutely keep wet hands
away.
Absolutely keep water
away.
●Keep this manual at a safe place where you can consult with
whenever necessary. Show this manual to installers when moving
or repairing the unit. When the ownership of the unit is transferred,
this manual and the “Installation Manual” should be given to a new
owner.
●
Electrical wiring work must be implemented only by qualified
specialists.
■
Precautions for installation
WARNING
Consult your dealer or a professional contractor to install
the unit.
Be sure to use the genuine optional parts specified by
MHI.
Improper installation made on your own may cause electric
shocks, fire or dropping of the unit.

−3−
WARNING
Consider measures not to exceed the critical concentration
of refrigerant in the event of leakage especially when the
unit is installed in a small room. Regarding the measure not
to exceed the critical concentration, please consult with our
dealer.
If the refrigerant leaks and exceeds the critical concentration,
it may cause oxygen deficiency accident.
Take care to protect terminal connections from external
forces or stress caused by wiring.
Improper connection or fixing could cause heat generation,
smoke or fire.
The maximum voltage connectable to the remote control
is DC 18 V. Do not connect to AC220~240V or 380/415V.
It could cause breakage, ignition or fire.
Do not operate HP unit or remote control whose panel or
cover is kept opened.
Operation with the electric live part kept opened may cause
electric shocks, fire.
The unit should not be used in inappropriate environment.
Using the unit at the following places could deteriorate its
performance significantly or cause electic shocks, break-
down, smoke or fire as a result of corrosion.
· Where air contains dense oil mist, steam, organic solvent
vapor, corrosive gas (ammonium, sulfuric compound, acid
etc)
· Where acidic or alkaline solution, cosmetics, special spray,
etc. are used frequently
· Where oil mist generates
· Where dense cigarette smoke exists
· Where dust floats in air
· Where water vapor generates or heavily humid area
· Where inflammable gas may generate, flow in. accumulate
or leak
· Where cosmetics or special spray is used.

−4−
WARNING
Grounding work shall be done securely.
Do not connect the grounding wire to a gas pipe, a water
pipe, a lightening rod or a earth wire of telephone
Improper grounding may cause, malfunction or electric
shocks at electric leak.
The earth leakage breaker should be installed
If the earth leakage breaker is not installed, it may cause
electric shocks.
Please ask the dealer where you purchased it or the
qualified specialist who installed it.
The remote control should not be installed where it is
exposed to direct sunlight or the ambient temperarures
become higher than 40°C or lower than 0°C.
It could cause deformation, discoloration or break-down.
CAUTION
The drain pipe work shall be done in order for the drain
water to drain off without fail.
Improper drain pipe work may cause getting the household
goods wet in flooded water or failure of heat pump unit due
to blockage of drain water.
Install the remote control on a place which can endure
its weight sufficiently.
In sufficient strength or improper installation could cause the
remote control to drop off.

−5−
■
Precautions for usage
WARNING
Avoid using combustible substances (hair spray,
insecticide, etc) near the unit.
Do not use benzene or paint thinner to clean the unit.
It could cause cracks, electric shocks or fire.
Stop operation under abnormal situation.
If continued, it could result in break-down, electric shocks,
fire, etc.
If any abnormal condition (burnt odor etc.) occurs, stop
operation, turn off the power switch and consult your dealer.
Stop operation when any anomaly is detected.
If operation is continued, it could cause fire or break-down.
Consult you dealer.
Do not use any liquid except clean water.
It may cause fire or explosion.
Do not touch the hot water pipe with bare hands in order
to check the hot water temperature.
It may cause a scald.
Do not change setting or cancel the protection device.
Change setting or cancelation of protection device may cause
fire, electric shocks or injury.
When using the unit together with combustion appliance,
be sure to ventilate frequently.
Insufficient ventilation may cause oxygen deficiency accident.
Do not insert your fingers or any sticks into the air outlet
port of the fan.
Since the fan rotates at high speed inside, it may cause injuries.
Even if the fan is stopping, it may suddenly start operation.
CAUTION
Do not use or let use the unit or remote control as play
equipment.
Improper operations could cause ill health or health disorder.
Never disassemble the remote control.
If you touch internal parts accidentally, you could get electric
shocks or cause trouble.
Consult your dealer when it is necessary to inspect its interior.

−6−
CAUTION
Do not wash the remote control with water or liquid.
It could cause electric shocks, fire or break-down.
Do not touch electric parts or operate buttons or screens
with wet hands.
It could cause electric shocks, fire or break-down.
Be sure to stop operation and shut down the circuit
breaker before starting maintenance work.
It could cause electric shocks or injury.
The cleaning of the inside of cylinder shall not be done
by yourself. Please consult with the dealer where you
purchased it
Cleaning with improper selection of detergent or improper usage
way may cause damage of the section coated with resin or
leakage. And if the detergent splashes on the electric part or
motor, it may cause failure, smoke or fire.
Do not use the base frame for installing unit which is
corroded or damaged after long term use.
If leaving it corroded or damaged, it may cause a fall of the unit
or injury.
Do not ride on the unit or put something on the unit.
It may cause falling or turnover.
Do not put anything which will be troubled by getting wet
under or near the unit.
If dew condenses on the unit, refrigerant pipe or water pipe or
drain water sticks depending on the operation state, it may
be damaged by dropping water.
Do not put anything such as a vase filled with water on
the unit.
It may cause electric shocks, ignition or malfunction of the
unit.
Do not put anything or not pile up fallen leaves around
the unit.
If there are fallen leaves, insects may intrude in the unit. And
if they touch the electrical components inside of the unit, it
may cause malfunction of the unit, ignition or smoke.

−7−
CAUTION
Do not touch the aluminum fin of the heat exchanger
with bare hands
If touching, it may cause injury.
Do not use benzene, paint thinner, wipes etc. to clean the
remote control.
It could discolor or break-down the remote control. Wipe it
with a piece of cloth which is squeezed tightly after wetting
with diluted neutral detergent. Finish up the cleaning by
wiping with a piece of dry cloth.
Do not pull or twist the cable of the remote control.
It could cause break-down.
Do not use the unit for special use such as preservation
of foods, animals, plants, precision apparatuses and art
objects.
It may cause deterioration in quality of stores.
Be sure to use only the fuse with proper capacity.
If steel wire or copper wire is used, it may cause malfunction
of the unit or fire.
Do not make the unit run or stopped with power switch.
It may cause fire or water leak. And if the auto-restart
function is set [Valid], it may cause injury by sudden rotation
of the fan.
Do not use the water for drinking
It may affect the health.
Do not leave the water piping filled with water, when stopping
the unit for long period.
It may cause deterioration of the water quality or malfunction
of the unit due to freezing water.
Please shut off the power of the unit and drain off.
Do not shut off the power.
It may cause malfunction of the unit due to freezing water.
If shutting off the power of the unit, please drain off.
If water could freeze due to power failure, shut off the power
immediately and drain off.

−8−
CAUTION
Use clean water conform to the water quality criteria. (Refer
to the criteria in page 7)
Deterioration of water quality may cause malfunction of the
unit and water leak.
If a solid body, discolored water, impurity or unusual order is
found, plea
se ask inspection.
This appliance can be used by children aged from 8 years
and above and persons with reduced physical, sensory or
mental capabilities or lack of experience and knowledge if
they have been given supervision or instruction concerning
use of the appliance in a safe way and understand the
hazards involved. Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by
children without supervision.

−9−
■
Precautions for relocation or maintenance
WARNING
Consult your dealer when moving, disassembling or
repairing the unit.
Never modify the unit.
Improper handling may result in injury, electric shocks, fire,
etc.
If the unit is submerged due to the natural disaster such
as flooding or typhoon, please consult with the dealer
where you purchased.
If starting operation of the unit, it may cause malfunction,
electric shocks and fire.
Do not use any refrigerant other than the specified
refrigerant (CO2).
The maximum high pressure is 14MPa.
If using the refrigerant which is not specified, it may cause
fire or explosion.
When repairing or inspecting the unit, be sure to stop the unit
and shut off the breaker
If the power breaker is not shut off, it may cause electric
shocks or injury by operating fan.
When repairing the unit, no one other than the service man must
not approach to the unit.
It may cause an unexpected risk involving danger.
■
Precautions for waste disposal
Your air to water heat pump should be marked with this
symbol. It means that waste electrical and electronic
equipment (WEEE as in directive 2012/19/EU) should not
be mixed with general household waste. Air to water heat
pump should be treated at an authorized treatment facility
for re-use, recycling and recovery and not be disposed of
in the municipal waste stream. Please contact the installer
or local authority for more information.

−10−
Component replacement guide for maintenance check and preventive maintenance
In order to maintain the safety and the function of the product, we would like to ask all customers owing this product to have
a periodical maintenance and to replace components by our authorized servicing company.
This list shows the contents and the interval of periodical maintenance under the general usage conditions and the rough
indication of the time to replace components.
Especially, regarding the timing of component replacement, the actual time for replacement should be decided in
consideration of the usage conditions such as water quality, air quality, setting of hot water operating hours and etc.
Concerning the concrete plan of maintenance check, please consult with our dealer.
Since we are preparing some plans of service contract, we would like to recommend you to conclude such service contract.
●The list is base on the condition to operate the unit for 10hours per day with applying night tariff.
Component Check point Inspection cycle
(Time/Year)
Estimated time
for replacement
Components of
refrigeration
circuit
Compressor
High pressure, intermediate pressure, low pressure (Is there any
big pressure deviation from standard operation data?) Vibration,
sound, insulation resistance, loose connection of terminal
1 40,000 hours
Heat exchanger
(Evaporator)
High pressure, intermediate pressure, low
pressure, cleanness of fin 1 10 years
Gas cooler (water heat
exchanger)
High pressure, intermediate pressure, low pressure (Is there any big
deviation from standard operation data?)
Pressure loss of water (Is the pressure loss of heat pump unit excessive?)
Discharge pipe temperature (Is the discharge pipe temp. protection control
activated frequently?)
1 10 years 
Solenoid valve
Behavior, leak, clogging (Is the defrost operation activated
frequently?, Is the hot water supplying capacity reduced?)
1 10 years
EEV (Electronic
expansionvalve)
Behavior, leak, clogging (Are LP and/or HP protection control
activated frequently?, Is the hot water supplying capacity reduced?)
1 10 years
Strainer
Temp. difference between inlet and outlet ports of strainer
(Is there any temperature drop at outlet port of strainer?)
1 At heavy service
Capillary tube Contact wear, vibration 1 10 years
Refrigerant pipe Contact wear, vibration 1 10 years
Components of
electrical circuit
Relay
Behavior, contact resistance at contact point, insulation resistance 1 10 years
Coil, solenoid
(SolenoidValve & EEV)
Insulation resistance 1 10 years
Crank case heater
Insulation resistance (Is any whitening or carbonizing found?) 1 20,000 hours
Anti-freezing heater
(Drain pan, Water piping)
Insulation resistance (Is any whitening or
carbonizing found?) 1 20,000 hours
Fuse Apparent condition 1 5 years
PCB (for Control,
Inverterand Water pump)
Apparent condition 1 10 years
High pressure switch (63H1)
Pressure sensors
Contact resistance at contact point
Is any rubbing on the capillary tube found? 1 10 years
Terminal block Loose connection of terminal 1 10 years
Wiring and connector
Disconnection, looseness, deterioration, rubbing 1 10 years
Capacitor Leakage of electrolysis solution,deformation 1 25,000 hours
Cooling fan Insulation resistance, anomalous sound 1 10 years
Magnet contactor (52C)
Contact resistance at contact point, behavior 1 25,000 hours
Outdoor fan Fan propeller Balance, crack 1 10 years
Fan motor
Insulation resistance, anomalous sound, vibration 1 20,000 hours
Components of
water circuit
Water pump (DC) Behavior, vibration, anomalous sound,
insulation resistance, water leakage 1() 5 years ()
Flow regulating valve
(CWFV1)
Behavior, vibration, anomalous sound,
insulation resistance, water leakage 1() 5 years ()
Motor valve (CWFV2 to
CWFV5)
Behavior, vibration, anomalous
sound,insulation resistance, water leakage 1() 5 years ()
Decompression valve
Behavior, anomalous sound, water pressure, water leakage 1() 5 years ()
Check valve
Behavior, anomalous sound, water pressure, water leakage 1() 5 years ()
Strainer Clogging, water leakage 1()Cleaning
2times/year ()

The inspection interval and component replacement interval marked () are greatly influenced depending
on the water quality to be used. Please consult with our dealer where you purchased for detail.

−11−
Water Quality Criteria
Makeup water and cyclic water shall be the water within the range of water quality criteria
mentioned below.
If water quality is out of the range of criteria, it may cause a trouble such as scale adhesion and
corrosion.
Item Cyclic water
(60°C<≦90°C)
Makeup water
Standard items
pH (25
°C ) − 7.0−8.0 7.0−8.0
Electric conductivity (25
°C ) mS/m
≦
30
≦
30
Chloride ion mgCl−/L
≦
30
≦
30
Sulphate ion mgSO4
2−/L
≦
30
≦
30
Acid consumption (pH4.8) mgCaCO3/L
≦
50
≦
50
Sulphate ion/Acid consumption −
≦
0.5
≦
0.5
Total hardness mgCaCO3/L
≦
70
≦
70
Calcium hardness mgCaCO3/L
≦
50
≦
50
Ionic silica mgSiO2/L
≦
30
≦
30
Reference items
Iron mgFe/L
≦
1.0
≦
0.3
Copper mgCu/L
≦
1.0
≦
0.1
Sulphide ion mgS2−/L Not detected Not detected
Ammonium ion mgNH4
+/L
≦
0.1
≦
0.1
Residual chlorine mgCl/L
≦
0.1
≦
0.3
Free carbon mgCO2/L
≦
0.4
≦
4.0
Stability index − −

−12−
General description of CO2heat pump water heater
1. Composition of CO2heat pump water heater
This heat pump water heater for commercial use is a heat pump water hater that is composed of
a heat pump unit with natural refrigerant such as CO2which can produce hot sanitary water with
heat pump technology and a hot water storage unit which can store hot water.
A touch panel type remote control is applied to this heat pump water heater for commercial use
and various function settings can be done with simle oeration.
It is available to operate up to 16 units of heat pump units simultaneously with one remote
control.
2. Mechanism of CO2heat pump water heater
The way to produce hot water with this heat pump water heater is that the heat energy retrieved
from the outdoor air heats up the refrigerant and such refrigerant circulated in the system
increases the water temperature.
Therefore, the heating amount to be given to the hot water as heating energy is “[The power
consumption of heat pump unit] + [the heat retrieved from the air]”.
Accordingly, the consumed energy efficiency becomes more than 1 (one). In other words so that
this system allows very high efficiency operation.
Merit of CO2refrigerant
· The global warming potential (GWP) is [ 1 ] and it is environment-friendly.
·
Since high temperature water can be produced efficiently, it is possible to adjust the heat
reserving volume by controlling the hot water temperature and to use the hot water for high-
temperature cleaning.
Retrieve
heat from
the air
Supply
hot water
Heat pump unit Hot water storage unit
Water Circulation
pump
Compressor
Feed
water
Expansion
valve
CO2
ref.
cycle
Gas cooler
(for heating
water)
Heat exchanger
(cooled by air)

−13−
3. Operation pattern of CO2heat pump water heater (for Hot Water)
This heat pump water heater is operated with the target hot water amount set at each set time
The typical operation pattern and setting items are explained with following figure.
Setting of hot water storage operation (Refer to the setting method in Page 20)
①Hot water temp
Store hot water in the hot water storage unit at the hot water temp set with remote control.
The heat reserving volume of the hot water storage unit can be increased or decreased by
increasing or decreasing the hot water temp.
If multiple heat pump units are connected to one remote control, it is available to set the hot
water temp individually.
②Hot water amount at each set time
Hot water amount can be set at each set time with remote control.
Set the hot water amount to meet the state of hot water usage.
③Peak-cut timer
It is available to prohibit or save operation of the heat pump unit at the designated time.
The contract amount of power can be reduced by applying peak-cut operation of heat pump
unit according to the power demand.
④Hot water amount setting
The hot water amount at each set time can be increased or decreased uniformly on the day
of a week basis.
In case that the usage amount of hot water may vary depending on the season or the day
of a week, please use this function.
Ex. 1 In summer: More In winter: Less
Ex. 2 From Monday to Thursday: Less Friday, Saturday: More Sunday: Normal
⑤Setting [Pause]
If it is a day off and no hot water is required to store, it can make hot water storage
operation prohibited.
Operation Operation Operation
100%
Set hot water amount
50%
0% 22:0014:008:0022:00
③In Pause by
peak-cut timer
Actual hot water amount
②Set hot water amount at each time
Store hot water during the night time
applied cheaper tariff.
If the hot water amount becomes lower than
the set value, hot water storing operation starts.

−14−
4. Operation pattern of CO2 heat pump water heater (for heating)
This heat pump can be used as space heating system also. The typical operation pattern and
setting items are explained with following figure.
Different heating mode is available.
①Mode AUTO
The heating set temperature changes automatically according to the outdoor temperature.
When the mode AUTO is selected, the shift temperature can be set.
②Mode MANUAL
The heating set temperature is directly set by user. It does not change with outdoor
temperature.

−15−
5. Operation pattern of CO2 heat pump water heater (for combination use)
This heat pump can be connected to the space heating system and hot water storage tank at the
same time. The typical operation pattern and setting are explained with following figure.
Setting in case of HW & Heating application (Combination use)
①Priority setting (Go to Page 57)
There are 2 schedules, 1 for Hot Water mode and 1 for heating mode. When both Hot Water
and Heating are required, the heat pump decides which operation mode is prioritized.
· HW priority
Every time, “HW operation” is prioritized over “Heating operation”.
· Heating priority
Always the “Heating operation” is prioritized.
Notice:
Even if the Heating priority is set, if there is a risk of water shortage, the Heat pump unit
could decide to move on the HW operation.
②Day off, Peak cut timer (Go to Page 32)
For these setting, they are common for both HW operation and Heating operation.

−16−
Description of functions and contents of CO2heat pump water heater
The following settings can be done with this remote control.
Regarding the detailed setting methods, please check each function mentioning in reference page.
Setting and display item Contents Reference
page
Run The heat pump unit can be started operation.
The heat pump unit is operated according to the set operation
pattern.
Page 27
Pause The heat pump unit can be paused operation.
The set operation pattern becomes invalid and the heat pump
unit does not start hot water storage operation.
Protection operation of heat pump unit (Anti-freeze protection
operation) may start.
Page 27
Schedule setting Setting of weekly
operation pattern
(Hot water)
Set the operation pattern on the day of a week.
■Maximum 8 patterns in a day can be set. Page 34
Setting of weekly
operation pattern
(Heating)
Set the operation pattern on the day of a week.
■Maximum 8 patterns in a day can be set. Page 35
Setting of annual
operation pattern
Set the operation pattern on a weekly basis Page 37
Setting of day off
①Every week
②Specific period of
time
③Specific day
On the day that the hot water storage operation is no necessary
such as holiday and day off, it can be set [Day off].
①Set the day in every week [Day off].
②
Set the [Start day] and the [End day], and set [Day off]
through this period.
③Set the specific day, and set it [Day off].
Page 39
Peak-cut timer Set the [Start time] and [End time] of the operation to limit the
capacity and saving rate of capacity.
■Maximum 4 patterns in a day can be set.
■From 0% to 80% (at 20% intervals) of the saving rate of
capacity can be selected.
The clock setting is required.
Page 41
Operation to fill up The heat pump unit is operated until the hot water storage
unit is filled with hot water up to 100%. Page 44
Setting of hot water temp Hot water temp can be set. Page 25
Setting of hot water amount Hot water storage amount can be increased or decreased
uniformly. Page 45
Setting of heating temp Heating temperature can be set. Page 31
Setting of heating mode Heating mode can be set between AUTO and MANUAL Page 31
Setting of silent mode Set the [Start time] and [End time] of the operation to limit the
noise level.
■Maximum 4 patterns in a day can be set.
Page 46
Setting of Legionela mode Set the [Starting date] and [Start time] and the frequency of
the Legionela operation. Page 49
Note
*When connecting to an external device such as Modbus to control the unit, do not operate from remote control.

−17−
Setting and display item Contents Reference
page
Display of
operation mode
Display contents on RC
Page 51
· Now stopping The heat pump unit is stopping
The heat pump unit does not start operation
· It makes a Pause by
switch Run/Pause,
· Paused by “Day
OFF”setting
The heat pump unit is stopping by operating [Run/Pause]
switch or by the “Day off” setting.
The heat pump unit does not start operation but it may start
protection operation.
· It is in operation by
standby
Since the current hot water amount exceeds the target amount,
it makes the heat pump unit standby.
· It is in operation to
top up
The heat pump unit is in operation to top up.
· It is in operation to
fill up
The heat pump unit is in operation to fill up.
· It is in heating
operation
The heat pump unit is in heating operation.
· Preparing for
heating
The heat pump unit is in standby before heating operation.
· In operation for anti-
freezing
In order to prevent water in the pipe from freezing, the water
pump is operating.
· In operation for
defrosting
The defrost operation is ongoing.
· In operation for
peak-cut
Peak-cut rate is set.
· Standby It makes the heat pump unit standby for starting operation.
Initial settings Clock setting Current time and date can be set or corrected
■In case of power failure within 80hours, the clock is kept going
by built-in battery for backup. If the period of power failure
exceeds 80hours, it is necessary to set clock time again.
Page 55
Date and time display On/Off, 12H/24H, display position of AM/PM can be set. Page 56
Contrast The contrast of LCD can be adjusted. Page 56
Backlight On/Off and lighting time of backlight can be set. Page 57
Controller sound On/Off of beep sound at touch panel operation can be set. Page 57
Priority setting The priority of operation pattern between HW and heating
can be set. Page 57
Summer time The adjustment of summer time can be set. Page 58
Note
*When connecting to an external device such as Modbus to control the unit, do not operate from the remote
control.

−18−
Setting and display item Contents Reference
page
Administrator
settings
Enable/Disable setting Permission/Prohibition setting of each operation can be set Page 60
HP unit selection The heat pump unit to be displayed on RC can be selected.
If not selected, RC select a heat pump unit automatically. Page 60
RC display setting •RC name and HP unit name can be registered.
•On/Off of [Defrost operation display] and [Display status of
HW amount] can be set.
•HW amount display can be changed the design by operating
[HW amount display setting] switch. (Usual/set1/set2)
Page 61
Step size of HW temp Step size of HW temp (at 5°C or 1°C intervals) can be set.
Factory default is 5°C. Page 65
Change administrator
password
Administrator password can be change. Page 65
User environment By selecting the operation pattern of typical business type,
the detailed operation pattern can be set easily. Page 66
Operation lamp
setting
[Usual] Turns ON when HP unit starts to operate.
[Set1] Turns ON if Run/Pause button is pushed. Page 68
Upper limit setting of
HW temp
This is used to set the upper limit value for the hot water
storage temperature. Page 68
Open tank
information
This allows checking the detection temperature of open tank
temperature sensor. Page 69
Application setting The use of the HP unit (HW, Heating, HW&Heating) can be
set. Page 70
Cancel weekly timer
(HW)
This is used when the HP unit is controlled by external control
system. Page 70
Check of RC setting Current setting list of RC and HP unit can be checked Page 71
Contact company Contact company and phone No. are displayed Page 78
Select the language Page 80
Note
*When connecting to an external device such as Modbus to control the unit, do not operate from the remote
control.