Mitsubishi Heavy Industries ESA30E-25 User manual

Manual No. '15tHM-T-246
TECHNICAL MANUAL
Air to Water Heat Pump
Including hot water recirculation system
Q-Ton Natural refrigerant CO2water heater
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CONTENTS
◦Service code history of ESA30E ...................................................................... 4
◦Service code history of RC-Q1E ...................................................................... 7
◦Software changes for units with service code / C ......................................... 8
1. GENERAL DESCRIPTION ............................................................................... 9
1.1 Mechanism of CO2 heat pump water heater for commercial use ............... 9
1.2 As for hot water storage unit ...................................................................... 10
1.3 CO2heat pump water heater: Operation chart ........................................... 11
1.4 Feature of natural refrigerant CO2 .............................................................. 12
1.5 Relation between recirculation load and cylinder volume .......................... 15
2. SPECIFICATIONS .......................................................................................... 18
2.1 Specifications of product ............................................................................ 18
2.2 Exterior dimensions ................................................................................... 29
2.3 Inner structure ............................................................................................ 30
2.4 System diagram ......................................................................................... 33
2.5 Electrical wiring .......................................................................................... 34
2.6
Heating system performance charcteristics for the operation to top up with recirculation loop .... 35
2.7
Performance correction method by the effects of outdoor relative humidity
..... 49
2.8 Operation sound ........................................................................................ 50
2.9 Control ....................................................................................................... 52
2.10 Technical infromation of European regulations ......................................... 64
(1) Lot2 ......................................................................................................... 64
(2) Lot11 (Grandless circulators) .................................................................. 67
3. APPLICATION DATA ..................................................................................... 69
3.1 Installation work for heat pump water heater ............................................. 69
(1) Before installation ................................................................................... 72
(2) Installation location (Obtain approval from the customer
when selecting the installation area) ....................................................... 78
(3) Carrying in and installation of unit ........................................................... 80
(4) Water piping work ................................................................................... 81
(5) Insulation work ........................................................................................ 86
(6) Electrical wiring work for the heat pump water heater ............................ 88
(7) Electrical wiring work for the unvented cylinder ...................................... 93
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(8) Control setting ....................................................................................... 101
(9) Anti-legionnaires’ disease control ......................................................... 106
(10) Connection to existing cylinder ........................................................... 109
(11) Commissioning and handover .............................................................. 110
(12) Inspection report ................................................................................... 111
(13) Notabilia for servicing (for CO2heat pump water heater) ..................... 113
(14) The behavior after power recovery ....................................................... 114
3.2 Installation work for remote control .......................................................... 115
(1) Safety precautions ................................................................................ 115
(2) Accessories & parts prepared at site .................................................... 116
(3) Installation place ................................................................................... 116
(4) Installation and wiring work ................................................................... 117
(5) Main/Sub setting when more than one remote controls are used ......... 119
(6) Power source and initial setting ............................................................ 120
(7) Installation settings and test run ........................................................... 121
(8) User environment (Simplified setting for operation pattern) .................. 123
(9) R/C function settings ............................................................................. 124
(10) Service & maintenance ......................................................................... 125
3.3
Setting and operation modes for unvented cylinder and configuration of master-slave units
.... 127
3.4
Design guidelines for CO2heat pump water heater with under floor heating and water recirculation
......... 131
3.5 External input and output ......................................................................... 135
3.6 Guideline for indoor installation of CO2heat pump water heater ............. 141
4. SERVICING ................................................................................................... 145
4.1 General description of servicing ............................................................... 145
4.2 Error code list ........................................................................................... 155
4.3 Troubleshooting ....................................................................................... 158
4.4 Component replacement as a guide ........................................................ 194
4.5 Disassemble and reassemble method ..................................................... 195
4.6 Cleaning procedure of CO2water heater gas cooler ............................... 215
4.7 Method of draining water from gas cooler ................................................ 220
4.8 7-segment display and compressor stop factor ....................................... 225
4.9 Compatibility table for water pump ........................................................... 232
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4.10 How to reset the accumulated water pump and compressor operating time ........ 233
4.11 Reference for control PCB replacement ................................................ 234
4.12 Operation start/stop condition ................................................................ 234
4.13 Power off in a system with multiple units ............................................... 235
4.14 Additional information for cylinder temperature sensor connection ....... 237
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Adaptation with Service Code A Adaptation with Service Code B Adaptation with Service Code C
Adapted to the E U E rp Directive
(Lot 2, Lot 11)
Adapted to MSC, UK
1. E xpansion of the width of fork inserts
for fork lift truck 1. Changed the fan guard pitch. (For adaptation to the revised LV D
Directive)
1. Changed the water pump to a high
efficiency model. (For adaptation to
the E rP Directive)
(N ew and old specifications are
compatible with each other.) Increased the number of fun guard wires,
and reduced the mesh size in order to
protect children’s fingers.
SSA451A010A ⇒SSA451A010B
E xpanded the width of fork inserts
provided at the base of heat source unit.
50mm x 180mm ⇒60mm x 230mm 2. Changed the size of letters on the
nameplate. (For adaptation to the
revised LV D Directive)
2. Changed descriptions on equipment
nameplates. (For adaptation to MCS, UK.)
Changed the size of letters on labels
attached to the heat source unit to
2.8mm or more (Capital letters)
Added new items and certification marks,
and changed the label size for adaptation
to MCS, UK.
2. Changed the mounting position of
intercooler. 160mm x 100mm ⇒210mm x 100mm
(N ew and old specifications are
not compatible with each other.)
3. Adaptation of warning label marks to
international standards
P CM303A011 ⇒P CM303A011A
Unified warning label marks attached to
the heat source units to those compliant
to international standards.
3. Improved the rustproof property
P ainted external panels (Base plate,
drain pan and heat exchanger clamp),
and added a cover to the water pump,
in order to enhance the rustproof property.
4. Structure of front service panel hook
In order to prevent the front service
panel from dropping off in the event
threads on the panel are dented, it has
been changed to secure the panel with hooks.
4. Changed the air vent valve specification
Added a handle to the air vent valve to
improve the serviceability.
5. Changed the anti-freeze heater capacity.
Total 352 W ⇒Total 191 W
(P arts changed)
・Front panel
・Side panel
・Upper panel
・Frame
・Fin guard
Software
version WCMC-1, 384 WCMC-1, 609 WCMC-1, 813
Compatibility See above. See Compatibility list Table1.See Compatibility list Table2.
N ewly adapted
regulation −Adapted to the revised E U LV D
Directive (2006/95/E C)
Service code history of ESA30E
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Parts compatibility
Table1. OK or N O for mounting parts in the specification category A to the specification category B
○：for OK to mount
×：for N O
Application to
Specification category B
Table2. OK or N O for mounting parts in the specification category A to the specification category A
○：for OK to mount
×：for N O
It has brackets to hook the front panel, but it can be
mounted. It is, however, limited to the front side only.
Front panel R：P CB122A122 ×
Front panel in Category B has hooks so that
it cannot be mounted on conventional models.
L：P CB122A122A ×
P CB131A042A ○
Frame P CB115A116B ○
P arts in category B
Fan guard P CB131A041 ○
Appearance is changed. (Mesh size of fan guard
in Category B is smaller than that in Category A.)
Side panel R：P CB123A090N ○
L：P CB123A090P ○
Fin guard P CB131A042 ○
Appearance is changed. (Fin guard in Category
B has the base section shorter by 5 mm after
the structural change to hook the front panel.)
Frame P CB115A116 ×
Frame in Category A has not brackets to hook
the front panel so that it cannot be mounted.
Item P art N o.
Application to current model
(Specification category A)
Remark
Fin guard P CB131A030 ×
Base section of fin guard in Category A is
5 mm longer. This makes difficult to remove
the front panel so that it cannot be mounted.
P CB131A030A
Front panel R：P CB122A091 ○
L：P CB122A091C ○
Item P art N o. Remark
P arts in category A
Fan guard P CB131A025A ○
Appearance is changed. (Mesh size of fan guard in
Category A is larger than that in Category B.)
Side panel R: P CB123A090D ×Side panel in Category B has hooks to
hold the front panel. Conventional parts
without the hooks cannot be mounted.
L: P CB123A090F ×
×
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Table3.
Compatibility of spare parts relative to the specification categories C.
Current model N ew model
(Adapted to E rP ) Remark
E SA30E-25/B E SA30E-25/C
P CM003A012 P CM003A017
SSA451A010A SSA451A010B △ ※1 ×
・Cannot ship current SSA451A010A to
E urope after 1/8/2015.
・There is no problem for shipments to
South Korea.
P CM505A008 
Detail DWG N o.: P CM505A007AA Detail DWG N o.: P CM505A007AB
[Conditions]
*1: It can be replaced at site if a pair of water pipes are changed to
P CM421A001A and 011A, and 2 sets of socket (P CM422N 011)
and O ring (P CM925C002A) are provided.
*2: If any error occurs in the master slave communications after
replacing the P CB, it can be solved by using P SZ 008A022

N ame
Type
E /I
Water pump
Spare P CB ○ ○ ※2
Compatibility
N ew spare parts
to current model Current spare parts
to new model

1
2
N o

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Service code history of RC-Q1E
Service code of the CO2water heater remote control RC-Q1E is changed to A from May 2015 after
arrangements to improve specifications and to add new functions.
Major changes are as listed below.
Item Adaptation with service code / A
Hardware
Appearance
・Design
・Touch screen, etc. N o change from current models.
P acking nameplate ・Added the description “service code / A”.
・P acking size is not changed.
Additional
function
Setting of upper
limit temperature for
hot water in the cylinder
Menu 
Added Upper limit setting of HW temp to the Administrator settings
menu, and enabled to set the upper limit temperature at 70 – 90℃.
It can be selected Usual ⇔Set 1 ⇔Set 2 by selecting
R/C function settings ⇒ HW amount display setting from the
Administrator settings menu.
LE D lights always if it is operated with the Run/P ause switch after
selecting Operation lamp setting from the Administrator settings menu.
E xample)
If the upper limit temperature at 80℃, the range of hot water temperature
that the user can set becomes 60 – 80℃. This is a measure to cope with
the problem of water quality at site likely to cause clogging.
Designs of the hot water
amount graph are
selectable.
Menu
Menu
Menu


Multiple language French and South Korean language can be used.
Improved
specifications
Deleted
More information Deleted from the display items because the More information
function is not provided.

and select E rror history or Maintenance code history ,
you can view these histories.
Added
Save HP Unit setting
Added following items to the save data in the Save HP unit setting operation.
・Flow regulating valve aperture correction value
・Initial setting operation status
・N umber of hermetic tank temperature sensors
・Hot water amount judgment differential value
・Upper limit of hot water temperature in the tank
N ote) Conventional save data (Hot water temperature in the tank,
heat-retention temperature, etc.) are saved in the same way.
Histories of error codes
(E N o.) and maintenance
codes (M N o.) can be
displayed separately.

N ote 1) Functions indicated in the rectangular frame (E x: Menu ) are items selectable on the LCD display,
by touching the screen.
For details, refer to the installation manual P JZ 12D103 and the instruction manual P JD012A111.
N ote 2) N ew and old remote controls are compatible with each other. It is compatible also between new and old heat
source water heaters (Service codes / 1, A, B and C).
Setting of LE D lamp
lighting
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4PGUXBSFDIBOHFTGPSVOJUTXJUITFSWJDFDPEF$
Software WCMC-1.813 is upgraded with changes and additions as described hereafter.
Item Changes
New defrost control
In order to shorten the defrost time, the new defrost control improves operation of
①E lectric E xpansion V alve (E E V ) control
②Water pump control
In the case of outside air temperature above -5℃, the water
pump is stopped during defrost operation.
Limited unit control
In the case of master - slave system, power input and therefore also capacity output, can be
controlled by reducing the number of heat pump water heaters running.
Refer to page 152 for the setting method.
All units defrost
All the heat pump water heaters connected in a master - slave configuration can be
symchronise to perform defrost at the same time.
This avoids some adjacent units to recirculate cold air during defrost, while others
are still running on top up or fill up operation.
Refer to page 152 for the setting method.
External output of hot
water amount
An external output signal can be sent out when the hot water amount has reached
a set point programmed by the user using the schedule setting.
This allows better interaction with external heat sources.
Refer to page 153 for the setting method.
Checking of
operations of CWFV 3
When SW5 -3 is on, the opening and closing check of electric water
valve CWFV 3 and 5were attained in OFF ⇔ON of SW6-7.
Refer to page 154 for the setting method.
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1. General description
1.1 Mechanism of CO2heat pump water heater for commercial use
• The CO2heat pump water heater for commercial use is a 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 applied to this heat pump water heater can control up to 16 units of
heat pump units.
• The way to produce hot water with this heat pump water heater is that the heat energy retrieved from the outdoor air
through the air to refrigerant heat exchanger of heat pump unit heats up the refrigerant and such refrigerant is increased its
temperature and its pressure much higher through the compressor and is transferred to the gas cooler (the refrigerant to water
heat exchanger). In the gas cooler, the refrigerant releases its heat to increase the water temperature and is returned to the air
to refrigerant heat exchanger after depressurized through expansion valve in order to evaporate easily.
On the other hand, the water stored in the hot water storage unit is circulated by the water circulation pump to the heat pump
unit through the connection pipe between the hot water storage unit and the heat pump unit. In the gas cooler, the water
exchanges the heat from the high temperature refrigerant and is heated up to higher temperature. Such hot water is returned
to the hot water storage unit and stored in the hot water storage unit.
The hot water in the hot water storage unit is distributed to the end of hot water supply system for utilizing.
•The power actually consumed is the power supplied to the compressor, fan and water circulation pump only. However the
total energy added to produce hot water is the power actually consumed and the heat retrieved from the outdoor air so that


temperature 16℃DB/12℃WB, water inlet temperature 17℃and water outlet temperature 65℃。
 
Retrieve
heat from
the air
Supply
hot water
Heat pump unit Hot water storage unit
Water Circulation
pump
Compressor
Feed
water
Expansion
valve
CO
2
ref.
cycle
Gas cooler
(for heating
water)
Heat exchanger
(cooled by air)
Retrieve
heat from
the air
Supply
hot water
Heat pump water heater Hot water storage unit
Water Circulation
pump
Compressor
Feed
water
Expansion
valve
CO
2
ref.
cycle
Gas cooler
(for heating
water)
Heat exchanger
(cooled by air)
<Merit of CO2as refrigerant>
 

• It has following advantage.
Hot water at 90℃
The size of hot water cylinder can be minimized.
The storage of heat can be controlled by adjusting storage water temperature.
The hot water can be used for washing.
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1.2 As for hot water storage unit
Heat pump water heater can be connected to an unvented hot water storage cylinder and it is applicable to various type of hot
water supply system.
What is the unvented hot water storage cylinder?

• The hot water can be supplied by the pressure in the cylinder.
• It is sanitary because the hot water is not exposed to the air.
• It is good for retaining heat
 
Unvented hot water storage cylinder
Operation
to top up Hot water
Water
Water
Hot water
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In case of 󲩭n󲩮ented hot water stora󲩟e s󲩱stem
󲨻loc󲩣 time 󲩀o󲩭r 21 22 2󲨫 0 1 2 󲨫 󲨬 5 󲨮 7 󲨰 󲨱 10 11 12 1󲨫 1󲨬 15 1󲨮 17 1󲨰 1󲨱 20 21
󲩅in󲩭tes 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱
Electricit󲩱 tariff
󲩈ea󲩣-c󲩭t settin󲩟 󲩈ea󲩣-c󲩭t: 0󲨝 󲩈ea󲩣-c󲩭t: 󲨮0󲨝
󲩀ot water amo󲩭nt
settin󲩟
󲩀󲩏 amo󲩭nt
100󲨝
󲩀󲩏 amo󲩭nt
󲨮0󲨝
󲩀󲩏 amo󲩭nt
󲨬0󲨝
󲩀󲩏 amo󲩭nt
20󲨝
󲩀eat p󲩭mp
󲩭nit
operation
󲩇N
󲩇󲨾󲨾
󲩀ot water
amo󲩭nt
100󲨝 1
󲨰0󲨝 2
70󲨝 󲨫
󲨮0󲨝 󲨬
50󲨝 5
󲨬0󲨝 󲨮
󲨫0󲨝 7
20󲨝 󲨰
0󲨝 -
Start Start Stop
󲩀ot water operation to fill 󲩭p
󲩀󲩏 operation to top 󲩭p 󲩀󲩏 operation to top 󲩭p
󲨼ashed - 2 dotted line
shows the tar󲩟et hot
water amo󲩭nt per ho󲩭r
set 󲩚󲩱 remote control.
󲩌ar󲩟et hot water amo󲩭nt
󲨻ircled with shows
the 󲩀󲩏 amo󲩭nt 󲨝 to 󲩚e set
󲩚󲩱 remote control
Solid line shows the
act󲩭al hot water
amo󲩭nt in the c󲩱linder
[󲩈reparation for
󲩚rea󲩣fast] 󲩀ot water
amo󲩭nt is decreased d󲩭e
to m󲩭ch 󲩭sa󲩟e of hot
󲩇peration is stopped
d󲩭e to pea󲩣-c󲩭t 0󲨝
󲩌he 󲩭nit is operated
at most 󲨮0󲨝 of max
rps d󲩭e to pea󲩣-c󲩭t
󲨮0󲨝
[󲩈reparation for l󲩭nch]
󲩇peration is started
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
decreases lower than the
tar󲩟et amo󲩭nt of 󲨮0󲨝
󲩇peration is stopped
󲩚eca󲩭se the tar󲩟et 󲩀󲩏
amo󲩭nt chan󲩟es from
󲨮0󲨝 to 󲨬0󲨝
[󲩈reparation for dinner󲩵
󲩇peration is started
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
decreases lower than
tar󲩟et amo󲩭nt of 󲨬0󲨝
󲩇peration is stopped
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
exceeds the tar󲩟et
amo󲩭nt of 󲨬0󲨝
󲩀󲩏 operation to top 󲩭p
󲩇ff-pea󲩣 rate period for thermal stora󲩟e 󲩭nit
Example: If the sensor No. 7 detects [(Set temp) - (15℃)] or hi󲩟her temperat󲩭re󲨤 it 󲩢󲩭d󲩟es the 󲩏󲩀 amo󲩭nt of 󲨫0󲨝󲨤
and if the sensor No. 7 detects [(Set temp) - (20℃)] or lower temperat󲩭re󲨤 it 󲩢󲩭d󲩟es the 󲩀󲩏 amo󲩭nt
is less than 󲨫0󲨝
S󲩭ppl󲩱 hot
󲩀eat p󲩭mp
water heater
[In case of 󲩭n󲩮ented hot water stora󲩟e s󲩱stem]
]
󲩅en󲩭
󲩅en󲩭
󲩏ee󲩣l󲩱 sched󲩭le settin󲩟 󲩏ee󲩣l󲩱 sched󲩭le settin󲩟
󲩈ea󲩣-c󲩭t timer 󲩅en󲩭
Next
SetSa󲩮e Next
SetSa󲩮e
󲩅on 󲩅on
Set End time
In󲩮alid
In󲩮alid
󲩎alid
󲩎alid
Start time 󲨻ontrol ratio
󲩌ime Stora󲩟e 󲩮ol󲩭me Stora󲩟e 󲩮ol󲩭me
󲩌ime
Start from 22:00 on pre󲩮io󲩭s da󲩱
Set 100󲨝 from 22:00 󲩭p to 󲨰:00
󲩌ar󲩟et 󲩀󲩏 amo󲩭nt is chan󲩟ed
from 100󲨝 to 󲨮0󲨝 at 󲨰:00
[󲩈ea󲩣-c󲩭t ratio chan󲩟ed 󲩚󲩱 remote control]
ll ]
[Stora󲩟e 󲩮ol󲩭me settin󲩟 󲩚󲩱 remote control]
ll ]
Select the No. col󲩭mn and ta
p
[Set
]
Select the No. col󲩭mn and ta
p
[Set
]
Set
Select the No. col󲩭mn and ta
p
[Set
]
󲨾eed water
Back
Back
Back
1.3 CO2heat pump water heater: Operation chart (Ex1. In case of unvented hot water storage system)
In case of 󲩭n󲩮ented hot water stora󲩟e s󲩱stem
󲨻loc󲩣 time 󲩀o󲩭r 21 22 2󲨫 0 1 2 󲨫 󲨬 5 󲨮 7 󲨰 󲨱 10 11 12 1󲨫 1󲨬 15 1󲨮 17 1󲨰 1󲨱 20 21
󲩅in󲩭tes 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱 00 5󲨱
Electricit󲩱 tariff
󲩈ea󲩣-c󲩭t settin󲩟 󲩈ea󲩣-c󲩭t: 0󲨝 󲩈ea󲩣-c󲩭t: 󲨮0󲨝
󲩀ot water amo󲩭nt
settin󲩟
󲩀󲩏 amo󲩭nt
100󲨝
󲩀󲩏 amo󲩭nt
󲨮0󲨝
󲩀󲩏 amo󲩭nt
󲨬0󲨝
󲩀󲩏 amo󲩭nt
20󲨝
󲩀eat p󲩭mp
󲩭nit
operation
󲩇N
󲩇󲨾󲨾
󲩀ot water
amo󲩭nt
100󲨝 1
󲨰0󲨝 2
70󲨝 󲨫
󲨮0󲨝 󲨬
50󲨝 5
󲨬0󲨝 󲨮
󲨫0󲨝 7
20󲨝 󲨰
0󲨝 -
Start Start Stop
󲩀ot water operation to fill 󲩭p
󲩀󲩏 operation to top 󲩭p 󲩀󲩏 operation to top 󲩭p
󲨼ashed - 2 dotted line
shows the tar󲩟et hot
water amo󲩭nt per ho󲩭r
set 󲩚󲩱 remote control.
󲩌ar󲩟et hot water amo󲩭nt
󲨻ircled with shows
the 󲩀󲩏 amo󲩭nt 󲨝 to 󲩚e set
󲩚󲩱 remote control
Solid line shows the
act󲩭al hot water
amo󲩭nt in the c󲩱linder
[󲩈reparation for
󲩚rea󲩣fast] 󲩀ot water
amo󲩭nt is decreased d󲩭e
to m󲩭ch 󲩭sa󲩟e of hot
󲩇peration is stopped
d󲩭e to pea󲩣-c󲩭t 0󲨝
󲩌he 󲩭nit is operated
at most 󲨮0󲨝 of max
rps d󲩭e to pea󲩣-c󲩭t
󲨮0󲨝
[󲩈reparation for l󲩭nch]
󲩇peration is started
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
decreases lower than the
tar󲩟et amo󲩭nt of 󲨮0󲨝
󲩇peration is stopped
󲩚eca󲩭se the tar󲩟et 󲩀󲩏
amo󲩭nt chan󲩟es from
󲨮0󲨝 to 󲨬0󲨝
[󲩈reparation for dinner󲩵
󲩇peration is started
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
decreases lower than
tar󲩟et amo󲩭nt of 󲨬0󲨝
󲩇peration is stopped
󲩚eca󲩭se the 󲩀󲩏 amo󲩭nt
exceeds the tar󲩟et
amo󲩭nt of 󲨬0󲨝
󲩀󲩏 operation to top 󲩭p
󲩇ff-pea󲩣 rate period for thermal stora󲩟e 󲩭nit
Example: If the sensor No. 7 detects [(Set temp) - (15℃)] or hi󲩟her temp󲨤 it 󲩢󲩭d󲩟es the 󲩏󲩀 amo󲩭nt of 󲨫0󲨝󲨤
and if the sensor No. 7 detects [(Set temp) - (20℃)] or lower temp󲨤 it 󲩢󲩭d󲩟es the 󲩀󲩏 amo󲩭nt
is less than 󲨫0󲨝
S󲩭ppl󲩱 hot
󲩀eat 󲩈󲩭mp
󲩍nit
[In case of 󲩭n󲩮ented hot water stora󲩟e s󲩱stem]
]
󲩅en󲩭
󲩅en󲩭
󲩏ee󲩣l󲩱 sched󲩭le settin󲩟 󲩏ee󲩣l󲩱 sched󲩭le settin󲩟
󲩈ea󲩣-c󲩭t timer 󲩅en󲩭
Next
SetSa󲩮e Next
SetSa󲩮e
󲩅on 󲩅on
Set End time
In󲩮alid
In󲩮alid
󲩎alid
󲩎alid
Start time 󲨻ontrol ratio
󲩌ime Stora󲩟e 󲩮ol󲩭me Stora󲩟e 󲩮ol󲩭me
󲩌ime
Start from 22:00 on pre󲩮io󲩭s da󲩱
Set 100󲨝 from 22:00 󲩭p to 󲨰:00
󲩌ar󲩟et 󲩀󲩏 amo󲩭nt is chan󲩟ed
from 100󲨝 to 󲨮0󲨝 at 󲨰:00
[󲩈ea󲩣-c󲩭t ratio chan󲩟ed 󲩚󲩱 remote control]
ll ]
[Stora󲩟e 󲩮ol󲩭me settin󲩟 󲩚󲩱 remote control]
ll ]
Select the No. col󲩭mn and ta
p
[Set
]
Select the No. col󲩭mn and ta
p
[Set
]
Set
Select the No. col󲩭mn and ta
p
[Set
]
󲨾eed water
Back
Back
Back
AMP Air Conditioning
www.ampair.co.uk | [email protected]

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1.4 Feature of natural refrigerant CO2
1.4.1 General characteristics
The general characteristics of CO2is as follows.
Under the atmospheric pressure, since CO2is gaseous state and has following characteristics, be careful to handle it.
a) It is colorless and odorless gas, but when interacting with water, it produces mild acidity and irritating odor.
b) When dissolving it with water, it will be mild acidic and may cause metal to corrode.
c) It is heavier than air and remains on the floor in the unvented room.
d) In case of high density, it may have a risk for addiction or suffocation.
e) Carbon oxide gas is effective for fire extinction because of noncombustible and nonflammable gas.
f) Liquefied carbon oxide is ordinarily stored in the bomb at -20℃
when releasing it into the air, it will be solid “Dry Ice Snow (frozen carbon oxide)” and CO2gas.
g) Solid carbon oxide is so called “Dry Ice” which is solidified “Dry Ice Snow” mentioned above. Since it has very low
temperature of -78.5℃under the atmospheric pressure, it may have a risk for frostbite when touching it with one’s bare
hands. And if it gets into someone’s eye, it may have a risk for loss of one’s eyesight. Therefore when releasing it, espe-
cially be careful to handle it.
Appearance Gas: Colorless
Liquid: Clear and Colorless
Solid: Milky white
If releasing the liquid CO2into the air, it will be a low-temperature
solid (Dry Ice)
Smell Odorless (When interacting with water, it produces mild acidity and
irritating odor.)
Absolute vapor pressure ℃)
℃)
℃)
Density of gas 1.977kg/m3 (0℃
Since it is heavier than air, it remains on the floor or in the dimple
Density of liquid 1.030kg/liter (-20℃
When varying to gas from liquid, it will expand its volume to roughly
500 times (At purging to the air)
Density of solid 1.566kg/liter (-80℃)
Solid CO2(Dry Ice) has extremely low-temperature at -78.5℃
Flash point 
Ignition point 
 

extinguishing gas.
Solubility into water 1.713 literCO2/liter H2O (0℃
1.194 literCO2/liter H2O (10℃
0.878 literCO2/liter H2O (20℃
CO2is easily dissolved into water and carbonic water can be made by
dissolving 1 liter of CO2into 1 liter of water.
Others The liquid CO2
Act
Table 1.1 General characteristics of CO2
AMP Air Conditioning
www.ampair.co.uk | [email protected]

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1.4.2 Characteristics of CO2refrigerant
CO2refrigerant is so called R744 and its physical property and saturated vapor pressure at each temperature are shown in
table 1.2.
For comparison purpose, it is shown in contrast with those of R410A refrigerant generally using for current air-conditioners.
The feature of CO2
2. This point of R410A is inferior
to CO2.
However the pressure of CO2
of R410A. And the critical point of CO2refrigerant is 31℃or higher. Therefore even if increasing pressure, it has a property
not to be liquefied.
Above features are suitable for producing hot water by heating up water from low temperature to high temperature at once
and are utilized widely for this purpose.
The pressure of CO2refrigerant at the temperature above the critical point is decided by the refrigerant temperature and refrig-

to high pressure is needed much more than that for R410A.
Items CO2(R744) R410A
Composition CO2R32/R125 (50/50%)

mixed refrigerant
 0 0
 1 1975*1
Saturated vapor pressure

-20℃1.97 0.40
0℃3.49 0.80
20℃5.73 1.44
25℃6.40 1.65
30℃7.21 1.88
Boiling point (℃) -78.4 -51.4
Critical temperature (℃) 31.0 71.4
 7.38 4.90
*1BasedonRegulation(EC)N0.842/2006
Table 1.2 Physical property and saturated vapor pressure of refrigerant
AMP Air Conditioning
www.ampair.co.uk | [email protected]

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1.4.3 Handling precaution of CO2refrigerant
Regarding the safety considerations to high pressure, be careful not to give any damage on the refrigerant circuit piping of
heat pump water heater during servicing, and to purge a small amount of the refrigerant gradually by adjusting valve opening
properly to a place where there is no person. (See 4.1 (2) Method to purge CO2refrigerant)
CO2refrigerant itself is harmless, but if sucking the high concentration CO2refrigerant, it may exert various influences on the
human body.
The influence on the human body exerted by the concentration of CO2gas in the atmosphere is shown in the table 1.3.
Concentration of CO2gas
(vol%) 
0.036 
0.5 Long-term safety limit (Critical concentration by weighted time average calculated
with 8 hours of averaged permissible time)
1.5  
phosphorus.
3.0 Workability comes down and alternation of physiological function will emerge as the
alternation on weight, blood pressure and heart rate.
4.0 Breathing becomes deeper and breathing rate is increased. It will be the state of
slightly gasping that is considerably discomfort feeling.
5.0  
results symptoms of poisoning.
7 to 9 It is the allowable limit. It will be the state of severely gasping and leads to
unconsciousness within about 15 minutes.
15 to 20 It produces more serious symptoms, but it is not fatal within 1 hour.
25 to 30 
and paralysis. It leads to death within a few hours.
Table 1.3 The influence on the human body exerted by the concentration of CO2gas in the atmosphere
As shown in the table 1.3, when the concentration of CO2becomes 3% or more, it leads to the alternation of physi-
ological function and at 7to 9% it leads to unconsciousness within about 15 minutes and at 25 to 30% it leads coma
and then to death. Therefore be careful for handling it.
Since CO2refrigerant is heavier than air and is likely to remain at the lower place, when CO2refrigerant may leak or is
released, be careful to work with taking a measure to prevent from remaining CO2on the floor by ventilating or such
ways.
The emergent measures at following states are mentioned below.
a) When sucking high concentration CO2gas.
Move the victim immediately to the place filled with fresh air and warm up him and keep him at rest.
If he is unconscious, loosen his clothing, clear his air way and give artificial respiration and then make him
received treatment by medical doctor promptly.
b) When liquid CO2stays on the skin
In case of mild frostbite, it is OK to rub down the affected area. However in case of severe frostbite, warm up the
affected area with lukewarm water and wrap it with gauze softly and then make him received treatment by medi-
cal doctor promptly.
c) When liquid CO2gets into one’s eye
Flush the eye with freshwater immediately and then make him receive treatment by medical doctor promptly.
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1.5 Relation between recirculation load and cylinder volume
1.5.1 Features
The CO2heat pump water heater allows converting a set of one way system composed of heat pump water heater and hot
water cylinders, without change and immediately, to a recirculation system by adding up a mixing valve and a recirculation
pump at site. Its 4,000 L cylinder volume composed of eight 500 L cylinders of which 2to 5cylinders (depending on the hot

of these cylinders is 4,000 L, remaining 3to 6cylinders can be used as the hot water supply load. This system, in this way, is
used where recirculation load and hot water supply load are present in mixture *1. With this system, risk of the short-supply
of hot water is small even if the hot water temperature is not increased remarkably so far as the recirculation load in use and
the hot water supply load are balanced well. When the water supply side of mixing valve is interrupted accidentally, hot water

use the system by lowering the hot water temperature *2.

*2: Take note that if anticipated balance is lost between the recirculation load and the hot water supply load, the supply of hot
water becomes likely to exhaust.
Hot water recirculation load
(see the next page)
*3: Regarding as recirculation system diagram, refer to page73.
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1.5.2 Example of calculation for recirculation load
●

Heat loss from piping (W)
=Heat loss per unit length of recirculation feed pipe diameter (see table below) ×recirculation feed pipe length ×(Recircu-
lation feed hot water temperature −Temperature around pipe) ＋Heat loss per unit length of recirculation return pipe
diameter (see table below) ×recirculation feed pipe length ×(recirculation return hot water temperature −Temperature
around piping)
=Heat loss from pipe (W)/(4.18 ×(Temperature difference between feed hot water
and return hot water on recirculation circuit) ×1,000) ×60
Table of heat loss from hot water supply piping [W/(m•℃)]
2•℃2•℃
of thermal conductivity for copper pipe is 388 W (m•℃), coefficient of thermal conductivity for stainless steel pipe is 16 W (m•℃),
•℃) and pipe heat insulator thickness (15 A ~ 50 A) is
20 mm.
Heat loss from hot water pipe [W/(m•℃)]

 15 20 25 30 32 40 50
Inch 1/2 3/4 1 11/8 11/4 11/2 2
Heat insulated steel pipe 0.2 0.24 0.29 −0.33 0.37 0.44
Heat insulated copper pipe 0.2 0.24 0.29 0.30 −0.37 0.41

Recirculation feed pipe 32 A ×50 m, recirculation return pipe 20 A ×50 m
Feed hot water temperature 60℃, return hot water temperature 55℃, ambient temperature 10℃
Heat loss amount =0.33 ×50 ×(60 – 10) ＋0.24 ×50 ×(55 – 10)
=1,365 (W)
=1,365/(4.18 ×(60 – 55) ×1,000) ×60
=3.9 (L/min)


Heat required for recirculation when the recirculation pump is operated for 24 hours continuously is:
Heat required for recirculation =1,365 W ×24 H ×3,600
=1.18 ×108J
When the hot water temperature is set at 80℃and the return hot water temperature is made at 55℃
required for recirculation is:
Hot water volume for recirculation =1.18 ×108/(4.18 ×(80 – 55) ×1,000)
=1,128 kg ≒1,128 L
This is nearly equal to 1,000 L. Therefore, two 500 L cylinders are required for the recirculation load.
As it is learned from the formula, the recirculation load varies largely depending on the setting of hot water temperature and the
operation time of recirculation pump.
From the viewpoint of energy saving, it is recommended to use lower hot water temperatures and to stop the recirculation
pump in time zones or seasons that do not require recirculation, by a timer, or the like.
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
If the hot water outlet temperature is changed, the number of cylinders as the recirculation load also changes.
For the calculation at 60℃
Hot water outlet temperature ℃90 85 80 75 70 65
Recirculation temperature setting ℃60 60 60 60 60 60
Recirculation return temperature ℃55 55 55 55 55 55
Feed pipe length m 50 50 50 50 50 50
Return pipe length m 50 50 50 50 50 50
Ambient temperature ℃10 10 10 10 10 10
Heat loss from recirculation circuit W 1365 1365 1365 1365 1365 1365
 L/min 3.9 3.9 3.9 3.9 3.9 3.9
Operation time H 24 24 24 24 24 24
Heat required for recirculation kJ ＋08 ＋08 ＋08 ＋08 ＋08 ＋08
Hot water volume required for recirculation kg≒L 806.1 940.5 1128.6 1410.7 1881.0 2821.4
 Qty 1.6 1.9 2.3 2.8 3.8 5.6
 Qty 6.4 6.1 5.7 5.2 4.2 2.4


loss and the recirculation load decrease.
Hot water outlet temperature ℃90 85 80 75 70 65
Recirculation temperature setting ℃60 60 60 60 60 60
Recirculation return temperature ℃55 55 55 55 55 55
Feed pipe length m 50 50 50 50 50 50
Return pipe length m 50 50 50 50 50 50
Ambient temperature ℃10 10 10 10 10 10
Heat loss from recirculation circuit W 1365 1365 1365 1365 1365 1365
 L/min 3.9 3.9 3.9 3.9 3.9 3.9
Operation time H 12 12 12 12 12 12
Heat required for recirculation kJ ＋07 ＋07 ＋07 ＋07 ＋07 ＋07
Hot water volume required for recirculation kg≒L 403.1 470.2 564.3 705.4 940.5 1410.7
 Qty 0.8 0.9 1.1 1.4 1.9 2.8
 Qty 7.2 7.1 6.9 6.6 6.1 5.2

Check of seasonal effect and setting of seasonal recirculation return hot water outlet temperature
 and it is
used, unchanged, in summer (ambient temperature at 30℃):
Heat loss amount =0.33 ×50 ×(60 – 30) ＋0.24 ×50 ×(55 – 30)
=795 (W)
=60 – 55), it
becomes 5deg/1,350×795 =3 deg so that temperature difference in summer and winter becomes 2deg. Therefore, provided the
recirculation return hot water temperature is 53℃in winter while it is 55℃in summer, it can be used regardless of seasons. Since
the calculation of heat loss amount is a guide, there will be no problem even if it is calculated with the recirculation temperature
at 60℃and the recirculation return hot water temperature at 55℃, as they are. Determine the recirculation return hot water
temperature by calculating the temperature difference in summer and winter as above and taking the season for test run into account.
AMP Air Conditioning
www.ampair.co.uk | [email protected]

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'15 • HM-T-246
Model
Item ESA30E-25
P ower source －3 P hase 380V ± 5%, 400V ± 5%, 415V ± 5%, 50/60Hz
Operation to top up
(In intermediate season)*1
Heating capacity kW 30.0
(Water amount) L/min 8.97
(P ower consumption) kW 6.98
COP － 4.30
Operation to top up
(In cold season)*2
Heating capacity kW 30.0
(Water amount) L/min 5.06
(P ower consumption) kW 10.73
COP － 2.80
Operating sound pressure (In intermediate season)*1、3dB(A) 58
Operating sound power (In intermediate season)*1dB(A) 70
E xterior dimensions
Height mm 1690
Width mm 1350
Depth mm 720 ＋35 (Water pipe connection)
Current Max Ａ21
Starting Ａ5
Unit weight kg 375 (During operation 385)
Color Stucco white (4.2 Ｙ7.5/1.1approx.)
Compressor Type× P cs Hermetic inverter compressor× 1
N ominal output kW 6.4
Refrigerant Type Ｒ744(CO2)
Charged amount kg 8.5
Refrigerant oil type ＭＡ 68
Charged volume cc 1200
Crankcase heater W 20
Anti-freezing heater
for water pipe W 21× 3
for drain pan W 40× 2
for drain hose W 16× 3
Heat exchanger ,Air side 
Heat exchanger ,Water
side (Gas cooler)
Type Copper pipe coil, indirect heat exchanger
P ossession quantity of water kg 10
Fan
Type 
Output× P cs W 386× 2
Air volume m3/min 260
E xternal static pressure P a 50
Water pump
Type× Output N on-self-suction spiral type inverter pump× 100W
Materials contacting to water PPS
Actual pump head m (kP a) 5m(49kP a) @ 17L/min
Usage temperature range
Outdoor air temperature ℃-25 to+ 43
Feed water inlet temperature ℃Top up 5-35,Warm up 35-63
Hot water outlet temperature ℃60-90
Water pressure range kP a 500 or lower (Keep water pressure more than 0kP a at the inlet of
heat pump water heater)
Defrost Hot gas type
 Compressor ; placed on anti-vibration rubber and wrapped with
sound insulation
P rotection devices High pressure switch，over current protection, power transistor overheat protection and
anomalous high pressure protection
P ipe connection
Feed water inlet Rc3/4 (Copper20A)*4
Hot water outlet Rc3/4 (Copper20A)*4
Drain water outlet Rc3/4 (Copper20A)*4
E lectric wiring
E arth leakage breaker 30A, 30mA, 0.1sec
P ower cable size □8mm2× 4 (Length70m)
Molded-case circuit breaker Rated current 30A, switch capacity 30A
Grounding wire size M6
Remote control wire size 0.3mm2× 2cores shielding wire(MV V S)
Design pressure MP a High pressure; 14.0 Low pressure; 8.5
IP code IP 24
2. SPECIFICATIONS
2.1 Specifications of product
(1) Heat pump water heater
AMP Air Conditioning
www.ampair.co.uk | [email protected]

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19
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'15 • HM-T-246
(2) Performance in MCS (Microgeneration Certification Scheme) conditions (UK only)
The performance based on MCS007 V 3.0 is as follows.
Operation to top up*1Heating capacity kW 28.0
COP 3.51
A-weighted sound power level*1,2 dB(A) 71
Usage temperature range on MCS conditions*3Outdoor air temperature
° C -15 to + 35
Feed water inlet temperature
° C 5-30
Hot water outlet temperature
° C 60-75
(N otes)1. P erformance of operation to top up in MCS condition shows the capacity measured under the conditions that outdoor air
temperature is 7
° C DB/6 ° C WB, water inlet temperature is 15 ° C , hot water outlet temperature is 65 ° C 
is 0.135L/sec.
2. Sound power level is in accordance with BS E N ISO 3741:2010 and BS E N 12102:2008.
3. Usage temperature range shows the range which can be operated on MCS conditions. E ach range differs from the product’s
usage temperature range.
(N otes)1. P erformance of operation to top up in intermediate season shows the capacity measured under the conditions that outdoor
air temperature is 16
° C DB/12 ° C WB, water inlet temperature is 17 ° C and hot water outlet temperature is 65 ° C .
2. P erformance of operation to top up in cold region shows the capacity measured under the conditions that outdoor air
temperature is -7
° C DB/-8 ° C WB, water inlet temperature is 5 ° C and hot water outlet temperature is 90 ° C excluding
heater for anti-freezing water(191W).

sound is resonated a little. Accordingly if the unit is installed on actual site, it is normal that the measured sound there is

4. P ipe size 20A= DN 20= 20mm= 3/4in
5. The actual hot water outlet temperature may vary ± 3
° C from target temperature according to the change of outdoor
air temperature and water inlet temperature And then if feed water inlet temperature is 30
° C or higher and outdoor air
temperature is 25
° C or higher, hot water outlet temperature may be controlled not to increase too high.

the standard, it may cause troubles such as scale buildup and/or corrosion.
7. These articles mentioned above may vary without any notice according to the development status.

of the country. E lectrical installation work must be executed according to the technical standards and other regulations
applicable to electrical installations in the country.
AMP Air Conditioning
www.ampair.co.uk | [email protected]