Hitachi RHUE-3AVHN1 Installation and operating manual

V1 – 2/15
Model Numbers
RHUE-3AVHN1
RHUE-(3-6)A(V)HN-HM
Hitachi Air Conditioning Europe SAS
UK Branch.
Whi ebrook Park, Lower Cookham Road, Maidenhead, Berkshire SL6 8YA
Hi achi Yu aki Hea pump
Ins alla ion reference manual

Page 2 of 61
General
This manual is provided by Hi achi Air Condi ioning Europe (HACE) for reference use by qualified
ins allers of he Yu aki range of hea pumps. Qualified ins allers will have a ended he Hi achi
recognised raining course before ins alling any Hi achi produc . Non a endance of such a course in a
recognised Hi achi raining cen re may void he warran y on any produc s supplied.
This manual does no replace he service manual which is referred o wi hin hese pages. This manual
provides guidance only as o he key elemen s of he design and ins alla ion of hea pumps and hea ing
sys em design (docking op ions) referred o on he fron cover of his manual.
This manual refers o he Yu aki M series hea pump service manual SMGB0090 rev.0 – 01/2014
No par of his publica ion may be reproduced, copied, filed or ransmi ed in any shape or form wi hou
he express permission of HACE.
All regula ions for wa er usage, energy efficiency, elec rical safe y and o hers as applicable o he
ins alla ion in force a he ime of he ins alla ion mus be adhered o and all such regula ions shall ake
precedence over any advice and inference given herein.

Page 3 of 61
Contents Page
Quick S ar .................................................................................................. 4
Configura ion selec ion guide ....................................................................... 5
In roduc ion ................................................................................................... 6
Lis of Accessories ...................................................................................... 8
Key ins alla ion considera ions ......................................................................... 11
Transpor a ion of hea pump ......................................................................... 13
Hea Pump hydraulic ins alla ion considera ions ........................................... 16
Advanced Sys em Con roller pack ............................................................ 18
Elec rical ins alla ion ...................................................................................... 19
Hea ing sys em hydraulics ......................................................................... 25
Hea ing circui examples ......................................................................... 26
Configura ion H ..................................................................................... 30
Configura ion 1.0 ...................................................................................... 32
Configura ion 1.2 ...................................................................................... 34
Configura ion 2.0 ...................................................................................... 38
Configura ion 2.1 ...................................................................................... 42
Configura ion 2.2 ...................................................................................... 46
Configura ion 3.1 ...................................................................................... 48
Configura ion 3.2 ...................................................................................... 50
Configura ion 4.1 ...................................................................................... 52
Commissioning procedure ......................................................................... 55
Commissioning cer ifica e ......................................................................... 58
Service record ................................................................................................... 60

Page of 61
Quick Start
1. Selec which ype of sys em you wish o ins all. See flowchar overleaf.
2. De ermine where he various sys em componen s should be ins alled.
3. Moun he sys em componen s.
4. Connec he sensors, RF receiver, Hea pump and o her sys em componen s o he sys ems
con roller according o your selec ed sys em configura ion.
5. Power up he sys em con roller and perform a fac ory rese by pressing he RESET bu on, selec
language and hydraulic configura ion.
6. Se he da e, ime and essen ial sys em parame ers according o he selec ed sys em
configura ion.
7. Se he DHW program if required.
8. Ensure room uni is communica ing wi h he sys em con roller. If no , perform binding
procedure.
9. Se ime/ empera ure profile in accordance wi h cus omer’s wishes.
10. Review all parame er se ings according he chosen sys em configura ion.
11. Tes he sys em
12. Comple e commissioning documen a ion and show end user how o opera e he room uni .
13. Leave all li era ure wi h he cus omer.
14. Re urn Commissioning cer ifica e o Hi achi in order o ac iva e warran y.
Important Considerations
Pre-Installation
Iden ify sui able space for Hea Pump, Domes ic Ho Wa er (DHW) cylinder and hea ing buffer ank.
Consider loca ion of key plumbing componen s bearing in mind requiremen for main enance access.
Availabili y of sui able wa er supply.
Availabili y of sui able elec rici y supply, N.B. many supply distribution authorities require notice prior to
connection heat pumps.
Installation
As Quick s ar above
Post-Installation
Thorough explana ion of sys em and hea ing con rols o cus omer a handover.
Regis ra ion for Renewable Hea Incen ive (RHI) or o her benefi s ha may be eligible if applicable.
Regis ra ion of sys em wi h he Micro-genera ion Cer ifica ion Scheme (MCS).
Servicing
Recommend annual servicing o check for debris in s rainer and ensure hea pump airways are clear.
Replace ba eries in room uni .
Always check sys em parame ers have no been al ered and check alarm his ory for anomalies.

Page 5 of 61

Page 6 of 61
Introduction
Where correc ly ins alled and main ained he Yu aki hea pump will provide adequa e hea ing and ho
wa er all year round. I is impor an ha he correc sys em configura ion (docking op ion) has been
chosen by he sys em designer o ensure ha comfor is main ained for he cus omer under ypical
ou door empera ures and ho wa er usage condi ions relevan o he geographical area and household
demands.
The performance of Micro-genera ion hea pump sys ems is impossible o predic wi h cer ain y due o
he variabili y of he clima e and i s subsequen effec on bo h hea supply and demand. HACE
endeavors o provide he bes available informa ion a all imes bu is given as guidance only and should
no be considered as a guaran ee.
The sys em designs ou lined in his manual include provision for hea ing only (Configura ion H), hea ing
and ho wa er genera ion using he Hea Pump alone (Configura ion 1.0 and 1.2), he Hea Pump wi h
elec ric backup (Configura ion 2.0, 2.1 and 2.2) and he Hea Pump wi h boiler backup (configura ion
3.2 and 4.1). There is also an op ion o include Domes ic Ho wa er only from he boiler and hea ing
from hea pump wi h boiler suppor (configura ion 3.1).
The defros cycle uses hea from wa er in he hea ing sys em. The designs ou lined assume ha here
will be sufficien sys em wa er volume and flow available a all imes for he Hea Pump o defros . The
defros cycle will normally ake wa er from he buffer ank bu where his is no sufficien or no buffer
ank is fi ed, here mus be sufficien wa er volume wi h no res ric ions of he hea ing wa er flow by
closed zone valves, underfloor hea ing ac ua ors or hermos a ic radia or valves.
If in doub , please con ac HACE Technical Suppor for fur her advice.
The able shown below provides heore ical informa ion abou he available volume of sys em wa er for
defros ing and he reduc ion of empera ure of he sys em wa er during he defros opera ion.
Model
Water tempera-
ture drop
RHUE-3AVHN1 RHUE-3A(V)HN1-HM RHUE- AVHN1-HM RHUE-5A(V)HN1-HM RHUE-6A(V)HN1-HM
5°C
232
212
276
342
410
10
°C
118
106
138
171
205
1
5°C
77
71
92
114
137
20°C
58
53
69
86
103
2
5°C
46
42
55
68
82
Note: The values shown above are based on theoretical installation conditions. Values can vary for different
hydraulic circuit configurations. Installers should recalculate these values for the real conditions of their installation.

Page 7 of 61
Domes ic Ho Wa er (DHW) is normally main ained a around 50°C in he ho wa er cylinder hus
preven ing he grow h of harmful bac eria even in normal use. However, pro ec ion agains he grow h
of legionella bac eria is provided by periodically raising he wa er empera ure in he DHW cylinder.
The hea pump provides a variable power ou pu depending on he hea ing and ho wa er load. The
power ou pu varia ion is achieved by a varia ion of speed of he compressor and fan sys ems wi hin he
hea pump. The con rol of he hea pump power is main ained a op imum efficiency and effec iveness
by he Advanced Sys em Con roller (ASC). Hea ing and ho wa er load is de ermined au oma ically by
he use of sensors which moni or he ou side air empera ure, indoor empera ure and wa er sys em
empera ures.
Full hea loss calcula ions in accordance wi h BS EN 12831 mus be carried ou by he sys em designer in
order o accura ely de ermine he size of he required Hea Pump.
A he ime of wri ing, planning permission is no generally required for air source hea pumps in he
Uni ed Kingdom. However, planning considera ions and calcula ions mus be carried ou in accordance
wi h MCS 020 which can be found on he following web si e:
h p://www.microgenera ioncer ifica ion.org/mcs-s andards/ins aller-s andards
No e: The Yu aki hea pump has been approved under he Micro-genera ion Cer ifica ion Scheme
(MCS). The ins aller of he equipmen mus also be accredi ed under MCS for he appropria e
echnology and he ins alla ion mus mee he requiremen s of MCS in order o be eligible for any
benefi under he Renewable Hea Incen ive (RHI) scheme.
Elec rici y supply au hori ies may need o be informed prior o ins alla ion of curren using equipmen .
Always check wi h your local dis ribu ion company before planning he ins alla ion.

Page 8 of 61
List of Accessories
The following accessories are available from Hi achi in order o assis he ins aller in mee ing design
requiremen s. Ins allers may choose o source heir own par s a heir discre ion. In order o ensure
equipmen warran ies are preserved i is impor an ha ins allers sa isfy hemselves ha such par s will
allow he sys em perform wi hin specified parame ers.
Accessory
Drawing symbol
Notes
Wilo ERP
Approved buffer
loading pump
Addi ional
accessories are
required in order o
fi he his pump
inside he Hea Pump
casing as hydraulic
fi ings wi hin he
hea pump are
differen from
s andard UK
plumbing sizes.
Pump adap or ki
n/a
An i
-
vibra ion
fee
Mus be
securely
anchored o he hea
pump and o he
ground.
Hea Pump
compa ible
DHW Cylinders
wi h G3 ki
Avai
l
able as
180L,
210L, 250L (solar
op ion), 300L (solar
op ion)

Page 9 of 61
4 Por Buffer
ank
Available as
50L,
95L,
150L,
210L
Flexible hose ki
Con ains 2 x hoses
wi h 1” BSP M hread
and fibre washers.
Full bore
isola ion valve
Full bore
isola ion valve
wi h s rainer
3 Way Valve
1 x 3 por zone valve

Page 10 of 61
Hydraulic
separa or
Only o be used in
sys ems wi h
sufficien open flow
wa er volume o
mee he
requiremen s of he
Hea Pump.
Elec ric Wa er
-
Hea er
Mus be fi ed in
accordance wi h
Hi achi
recommenda ions
for pump and bypass
as required.
2nd empera ure
ki
Con ains Mixer valve
and sensor o enable
con rol of a low
empera ure hea ing
circui
Advanced
Sys em
Con roller Pack
Refer o Advanced
Sys em Con rol
Reference Manual

Page 11 of 61
Key installation considerations
Ins alla ions wi hin 4km of he Sea or Ocean will require an an i-corrosion pro ec ion rea men . In such
circums ances he Blygold op ion mus be chosen when he Hea Pump is ordered.
The hea pump mus be moun ed ex ernally away from obs ruc ions which migh preven smoo h air
flow hrough he uni . Moun ings shall be such as o preven noise and vibra ions from causing nuisance
o building occupan s or neighbouring proper y’s. The hea pump should be si ed away from sleeping
areas and shall be si ed away from he influence of s rong winds.
Provision shall be made for main enance access o he uni , par icularly from behind and o he righ
looking a he machine from he fron .
Provision shall be made for he safe removal of was e evapora ive wa er from he hea pump which is
produced during he defros cycle. This is par icularly impor an during win er mon hs when ground
freezing may occur. The run off from he defros process mus be direc ed away from foo pa hs, pa ios
and roadways.
Pipework ex ernal o he building shall be insula ed agains ex reme empera ures in order o preven
loss of hea from he sys em.
Freeze pro ec ion of working uni s is no required due o he au oma ic fros pro ec ion func ion of he
hea pump. Cau ion mus be exercised under cold condi ions as he hea pump may s ar unexpec edly.
In excep ional circums ances or when here is a possibili y of power loss during cold condi ions, i is
recommended ha an an i-freeze solu ion be added o he hea ing sys em in order o provide freeze
pro ec ion.
All elec rical wiring shall be sui ably pro ec ed agains acciden al damage and ingress of mois ure o any
par of he hea pump.
The hea pump may be connec ed o he hea ing sys em via a hea ing buffer ank which provides a
ready supply of hea ed wa er for he hea ing sys em o draw on a any ime. The wa er in he buffer
ank will be hea ed o a empera ure ha is se by he opera ing parame ers of he sys em and is
dependen on he ou side empera ure, he desired comfor level wi hin he building and he selec ed
hea curve wi hin he con roller.
I is impor an ha he end user unders ands ha he empera ure of he buffer se by he above
parame ers may limi he flow empera ures wi hin he hea ing sys em irrespec ive of local con rol
se ings a radia or or under-floor hea ing zone con rol level.
Sys ems ha do no include a buffer ank are relian on he rapid delivery of hea ed wa er from he hea
pump and any backup hea sources in order o mee hea ing demand.

Page 12 of 61
Domes ic ho wa er hea ing is priori ised over space hea ing by he con roller during he 2 periods ha
are se in he sys em con roller. This priori y may be periodically disabled by he use of he Tariff/Timer
inpu on he sys em con roller in order o preven excessive reduc ions in hea ing capaci y if he ho
wa er empera ures canno be achieved by he hea pump during he normal ho wa er genera ion
cycle.
Diversion of wa er o hea ing or ho wa er genera ion is facili a ed by he sys em con roller and carried
ou by he use of pumps and/or valves. Where possible i is recommended ha pumps only are used in
order o main ain sys em reliabili y and in order o maximise opera ing efficiency and minimise he
likelihood of breakdown be ween sys em servicing.

Page 13 of 61
Transportation
The hea pump mus be ranspor ed in i s original packaging in an uprigh posi ion only.
If lif ed by hois or crane observe he following precau ions.
•Use sui able wire lif ing ropes only
•Pro ec he uni agains abrasion from he lif ing ropes
•Lif smoo hly
•When handling manually, ensure adequa e personal are involved o preven damage or injury.
•Do no remove wooden base from uni un il final ins alla ion
•Always lif using sui able slings
•The Cen re of gravi y of single fan uni s is 440mm from base of hea pump
•The Cen re of gravi y of win fan uni s is around 550mm from base of hea pump
•See he service manual Page 12 for grea er de ail of weigh dis ribu ion
Installation space
Sufficien space shall be provided around he hea pump o allow fresh clean air o be drawn from he
rear of he uni , hrough he fan(s) and expelled safely from he fron . Cold air expressed from he fron
of he uni mus no be allowed o re-circula e o he rear of he uni . Access mus be made available
from he sides and above he uni for main enance purposes.
A minimum space of 200mm mus be lef be ween rear of he hea pump and he neares wall. Ideally
his dis ance will be grea er han 200mm in order o allow sufficien access for main enance of he uni .
Any roof or s ruc ure connec ed o he rear wall shall be a leas 1000mm above he hea pump.

Page 1 of 61
A clear space of a leas 600mm shall be made in fron of he hea pump. Plan s or foliage in fron of he
hea pump may provide a good source of visible pro ec ion and absorb some of he high frequencies
genera ed by he inver er bu a his dis ance, should no be allowed o grow above half he heigh of
he uni . The air expressed from he fron of he hea pump shall of en be a sub zero empera ures
which may damage such flora .
Ideally 500mm should be made available ei her side of he hea pump o facili a e efficien air flow and
allow main enance access. In excep ional condi ions, his space may be reduced o he absolu e
minimums expressed in he service manual, al hough performance may be affec ed and main enance
access may be compromised.
The hea pump should be si ed away from sources of falling leaves, build up of snow and s rong winds.
De ails of space limi a ions for more complex spaces are shown on page 13 of he Service manual.
Mounting
Ideally he hea pump shall be moun ed on a concre e base of dimensions grea er han 440mm x
1250mm. The base shall be separa ed from any dwelling and shall provide drainage for any condensa e
run off. A ypical base is shown below.
Drainage mus be made available from he slab for rainwa er runoff and hea pump condensa e.
Condensa e is fresh wa er wi hou con aminan s bu may be very cold and subjec o freezing during
cold wea her. Such run off mus be direc ed away from walk ways and shall ideally be o gravel
surrounding he concre e base o aid na ural drainage.

Page 15 of 61
The hea pump should be fi ed wi h an i-vibra ion moun s. Af er levelling he hea pump on he base,
he moun ings mus be secured o he hea pump and he ground o preven acciden al ipping of he
machine. Addi ional pro ec ion mus be provided be ween he rear of he machine and he neares wall
o fur her safeguard agains acciden al ipping due o unforeseen loads being applied o he op or rear
of he machine. Where rigid fixings are used, an i vibra ion elemen s mus be provided be ween he
bracke and he wall.
Fur her moun ing op ions and de ailed dimensions of he hea pump fee are given on page 14 of he
service manual.
Op ional par s are available o assis opera ion in posi ions exposed o wind and snow. De ails of hese
par s are given in he service manual on pages 16 o 20.

Page 16 of 61
Hydraulic installation
Where he hea pump is no delivered wi h an in ernal buffer loading pump fi ed, he pump and
adap or accessories mus be ob ained. Please check op ions when ordering.
The buffer loading pump flow direc ion varies on differen models. I is essen ial ha wa er flow is in he
correc direc ion. Ex reme care mus be aken when fi ing he pump accessory o ensure correc pump
opera ion.
Where he buffer loading pump is no fi ed inside he hea pump, i may be fi ed elsewhere bu as
close o he hea pump as is reasonably prac icable.
The hea pump mus be fi ed wi h wo flexible hoses which mus be connec ed direc ly o he hea
pump in order o preven vibra ions from he uni affec ing adjacen buildings and in ernal pipe-work.
Hea ed wa er flows from he hea pump wa er ou le and re urns from he sys em o he hea pump
wa er inle . These connec ions are a he rear of he machine as shown below.
N.B.
Wa er ou le is hea ing flow
Wa er inle is hea ing re urn.
NOTE: Failure o observe correc connec ion of flow and re urn pipe-work will preven correc sys em
opera ion and may resul in damage o he hea pump.
The s rainer mus be fi ed immedia ely af er he flexible hose from he wa er inle o preven ingress of
par icles o he hea pump hea exchanger. The s rainer mus be securely fixed on bo h sides wi h
bracke s on solid pipe-work. Posi ioning of he s rainer mus be such ha easy access for regular
inspec ion and cleaning of he fil er elemen can ake place. Full bore isola ion valves mus be fi ed in
bo h he flow and re urn pipe-work in order o facili a e s rainer removal wi h minimal loss of sys em
wa er. A combined isola ion valve and s rainer is available from HACE as an accessory.

Page 17 of 61
All ex ernal pipe-work, valves and fi ings mus be properly fixed, soundly insula ed and wea her proof.
Iden ifica ion of flow and re urn pipe-work and accessibili y of s rainer and isola ion valves is essen ial
for ease of main enance.
All pipe-work from he hea pump o he sys em componen s (Hydraulic separa or, DHW cylinder, Buffer
ank e c.) mus be 28mm copper in order o minimise pressure drop and main ain sys em efficiency
under wors case opera ing condi ions. All remaining pipe-work shall be selec ed and sized according o
sys em design considera ions as se ou in his documen , local requiremen s and regula ions in force a
he ime of ins alla ion.
Sensors mus make a mechanically sound and hermally efficien connec ion o pipe-work and sensor
pocke s. Use of hermal ransfer (e.g. hea -sink) compound, mechanical fixings and aluminium ape are
recommended, surrounded by good quali y hermal insula ion.

Page 18 of 61
Advanced System Controller (ASC) pack
The Hea Pump is supplied wi h an Advanced Sys em Con roller pack. This comprises he following
componen s:
•Advanced sys em Con roller (ASC)
•Terminal packs (1 whi e (power), 1 black (con rol and communica ions))
•Wire rou ing bar
•Safe y covers x 2
•Tempera ure sensors x 2
•RF Receiver
•Remo e RF room uni wi h ba eries
•Manuals
Brief echnical reference informa ion abou he hardware connec ions and opera ion of he ASC are
given in he reference manual accompanying his documen .
De ailed Ins alla ion and usage ins ruc ions for he ASC and room uni are provided in he manuals
enclosed in he ASC pack.
A simple user guide for he opera ion of he Room Uni is provided a he end of his manual.

Page 19 of 61
Electrical installation
General
The ins alla ion of elec rical sys ems comprise:
a) Power dis ribu ion
b) Power con rol
c) Moni oring and communica ion
All of he above elemen s mus be considered a he planning s age in order for he ins alla ion o be
efficien and effec ive.
The Power dis ribu ion elemen s are here o make sure ha power is available from he mains power
source or consumer uni and is available in a safe and pro ec ed manner o all aspec s of he sys em.
All installations must comply with BS7671. The requirements of BS7671 always take priority over any
information implied or given in this document.
The Advanced Sys em Con roller dis ribu es bo h power and con rol func ionali y o he sys em pumps,
valves e c. and provides mains power con rol o he cylinder immersion relay. Some con rol func ions
be ween he hea pump and con roller opera e a mains vol age and hence i also falls wi hin he power
con rol ca egory.
The moni oring and communica ion wires are mainly ex ra low vol age and as such mus be run
separa ely from he power and power con rol wiring.
Elec rical power is generally required for he following sys em elemen s:
1) Hea pump
2) Advanced Sys em Con roller (ASC)
3) Cylinder immersion hea er
4) Cylinder immersion relay
5) Addi ional hea sources and associa ed relays as required e.g. boiler, elec ric hea er e c.
The wireless room uni is powered by ba eries and does no require a mains power supply.
Each elemen should have a separa e power sys em wi h sui able fuse pro ec ion. All sys em elemen s
shall be powered from he same phase and where spli load consumer uni s are used and full isola ion of
Neu rals canno be guaran eed. All sys ems shall be powered from he same side of he consumer uni .
Where 3 phase uni s are ins alled, L1 shall be used for all con rol func ions.

Page 20 of 61
The following able shows he power ra ing for each hea pump model.
Model
Power supply
Max. Vol age ()
Min vol age (V)
Max. Curren (A)
RHUE
-
3AVHN1
1
~
230V 50Hz
253
207
21.8 (*18.5)
RHUE
-
3AVHN
-
HM
1
~
230V 50Hz
253
207
21 (*18)
RHUE
-
4AVHN
-
HM
1
~
230V 50Hz
253
207
21 (*18)
RHUE
-
5AVHN
-
HM
1
~
230V 50Hz
253
207
29 (*26)
RHUE
-
6AVHN
-
HM
1
~
230V 50Hz
253
207
32 (*29)
RHUE
-
5AHN
-
HM
3N
~
400V 50Hz
440
360
14 (*11)
RHUE
-
6AHN
-
HM
3N
~
400V 50Hz
440
360
18 (*15)
*Curren excluding buffer loading pump
The cylinder immersion hea er is ra ed a 3kW. A 13A fused ou le should be provided for his i em.
All con rol circui s are rela ively low power wi h he grea es of hese being he circula ion pumps. These
pumps may be powered from he sys em con roller providing each accessory is ra ed a less han 3A and
ha he o al load on he sys em con roller does no exceed 10 Amps.