Mitsubishi Electric Fresh Master GUF-50RDH4 User manual

Installation Instructions
1301875HF8601
Fresh Master
Models:
GUF-50RDH4
GUF-50RD4
GUF-100RDH4
GUF-100RD4

Caution:
1. Always use an all pole disconnection for the main switch (breaker) for the power connection.
2. Always use double insulated PVC cable for the transmission lines.
Vorsicht:
1. Verwenden Sie als Hauptschalter immer einen Schalter, der alle Pole der Stromversorgung
trennt.
2. Verwenden Sie für die Übertragungsleitungen ausschließlich doppelt isoliertes PVC-Kabel.
Précaution:
1. Utilisez toujours comme connexion sur le secteur un disjoncteur principal de mise hors tension
de tous les pôles.
2. Utilisez toujours un câble en PVC à double isolation pour les lignes de transmission.
Cautela:
1. Per l’interruttore principale (interruttore di circuito) per il collegamento di alimentazione elettrica,
bisogna usare un’interruttore di disconnessione di tutti i poli.
2. Per le linee di trasmissione, usare solo un cavo in PVC a doppio isolamento.
Cuidado:
1. Utilice siempre una desconexión de todos los polos para el interruptor (disyuntor) principal de
la conexión del suministro eléctrico.
2. Utilice siempre cable de PVC con doble aislamiento para las líneas de transmisión.
Cuidado:
1. Desligue sempre todos os pólos do interruptor (disjuntor) principal para ligação da electricidade.
2. Utilize sempre cabos de PVC de isolamento duplo para as linhas de transmissão.
Voorzichtig:
1. Gebruik voor de hoofdschakelaar van de elektrische voeding (stroomverbreker) altijd een
schakelaar, waarbij alle polen verbroken worden.
2. Gebruik altijd dubbel geïsoleerde PVC-kabel voor de transmissieleidingen.
Προσοχή:
1. ×ñçóéìïðïéåßôå ðÜíôá ìç÷áíéóìü áðïóýíäåóçò üëùí ôùí áêñïäåêôþí ãéá ôïí êýñéï äéáêüðôç
(áóöáëåéïäéáêüðôç) ãéá ôç óýíäåóç ìå ôçí ðáñï÷Þ ñåýìáôïò.
2. ×ñçóéìïðïéåßôå ðÜíôá êáëþäéï PVC ìå äéðëÞ ìüíùóç ãéá ôéò ãñáììÝò ìåôÜäïóçò.
注意:
1. 電源連接用的主開關（斷路器）一定要使用所有電極都能脫開的結构型式。
2. 傳輸線路一定要使用雙重絕緣的PVC電纜。

ENGLISH
1
- Pleasetakethetimetoreadthroughtheseinstructions
beforecommencingwiththeinstallationwork.Theywill
help to install the Fresh Master properly and safely.
- The separate Operating Instructions are for the user.
Make sure that they are handed over to the customer.
The warranty will not apply to damage resulting
from failureto follow thewarnings and precautions
set forth in the Installation Instructions .
Contents
1. Safety precautions.............................................1-5
2. Accessories..........................................................5
3. Outline drawings................................................... 5
4. Selecting an installation site.................................6
5. Installing the Fresh Master................................6-7
6. Supply pipe and drain pipe work.......................... 8
7. Refrigerant pipe work...................................... 9-11
8. Electrical wiring .............................................12-16
9. Feature settings.............................................17-19
10. Check points after installation work....................19
11. Test run..........................................................19-20
12. Troubleshooting..................................................21
Fresh Master
Models:
GUF-50RDH4, GUF-50RD4
GUF-100RDH4, GUF-100RD4
Installation Instructions (For use by dealer/contractor)
GUF-50RDH4 shown above.
Humidier function not available on GUF-50RD4 and
GUF-100RD4.
English is original. The other languages versions are
translation of the original.
For use with the R410A & R407C
- Do not modify or disassemble.
- It could cause re, electric shock or injury.
- The Fresh Master and remote controller
should not be installed where it is highly hu-
mid, like a bathroom, or other wet place.
- It could cause electric shock or power leakage.
- Connect the product properly to ground.
- Malfunctioning or power leaks can cause elec-
trical shock.
- Usethespeciedpowersupplyandvoltage.
-Use of incorrect power supply or voltage could
cause re or electric shock.
- Selectaplacewithsufcientstrengthand
install the main unit securely.
- It could cause injury if it falls.
Do not
disassemble
Prohibition of use in
bath or shower room
Connect the
grounding wire.
The instructions
given must be
followed.
- Wiringworkmustbeperformedbyqualiedprofessionals,andbe
implemented safely and securely in accordance with the engineering
standards and the extension wiring rules for electrical equipment.
- Poor connection or improper wiring work could cause electric
shock or re.
- Install a power supply isolator at the power supply side as
per local electrical regulations. All supply circuits must be
disconnected before obtaining access to the terminal de-
vices.Usethespeciedcablesizeandconnectthecables
securelytopreventdisconnectionwhentheyarepulled.
-
If there is a defect in the connection, there is a possibility of re.
- Select an adequate place for the opening to introduce
outdoor air, where it will not intake the exhaust fumes like
combustion gas, or others, and there is no risk of blockage.
- Shortage of fresh air could put the room in a state of oxygen deciency.
- A duct made of steel must be installed with care not to be
connected electrically with metals such as metal , wire ,
stainless steel plate, or others.
- It could cause re when power leakage occurs.
WARNING
The instructions
given must be
followed.
1. Safety precautions

2
ENGLISH
1.1. Installation
Afteryouhavereadthismanual,keepitandtheInstallation
Manualinasafeplaceforeasyreferencewheneveraquestion
arises. If the unit is going to be operated by another person,
makesurethatthismanualisgiventohimorher.
Warning:
- Neverchargeanytypesofrefrigerantotherthanthosespeci-
edbyMitsubishiElectric.Failuretofollowthiswarningmay
resultinviolationoflaw,orblowout,explosionorrewhen
theproductisused,serviced,ordisposedof.Thetypesof
refrigerantthatcanbeusedarespeciedinthemanualsup-
plied with the product or on the product nameplate. Mitsubi-
shiElectricshallassumenoliabilityforanydamage,break-
down, malfunction, or accident resulting from the charging of
arefrigerantnotspeciedbyMitsubishiElectric.
- The unit should not be installed by the user. Ask the dealer
oranauthorizedcompanytoinstalltheunit.Iftheunitis
installedimproperly,waterleakage,electricshockorremay
result.
- UseonlyaccessoriesauthorizedbyMitsubishiElectricand
askyourdealeroranauthorizedcompanytoinstallthem.If
accessories are installed improperly, water leakage, electric
shockorremayresult.
- The Installation Manual details the suggested installation
method. Any structural alteration necessary for installation
must comply with local building code requirements.
Before operating the unit, make sure you read all
the “Safety precautions”.
“Safety precautions” lists important points about
safety. Please be sure to follow them.
Symbols used in the text
Warning:
Describesprecautionsthatshouldbeobservedtoavoidthe
risk of injury or death to the user.
Caution:
Describesprecautionsthatshouldbeobservedtopreventdam-
age to the unit.
Symbols used in the illustrations
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock. (This symbol is displayed on the
main unit label.) <Colour: Yellow>
Warning:
Carefullyreadthelabelsafxedtothemainunit.
Prohibited
- Do not place a burning appliance in a place
where it is exposed directly to the air from the
Fresh Master.
- It could cause an accident as a result of incom-
plete combustion.
- Do not use at a place where it is exposed to
hightemperatures(40˚Corhigher),naked
ames,orinenvironmentwithcombustible
fumes.
- It could cause re.
- Donotuseinanenvironmentsuchasa
chemicalfactory,wherehazardousgasessuch
as acidic gases, alkaline gases, organic sol-
ventfumes,paintfumes,orgasescontaining
corrosivecomponentsaregenerated.
- It could cause malfunction.
- Do not install this product in a place where it
isexposedtoultravioletlight.
- UV may damage covering insulation.
- Putonglovesduringinstallation.
- It could cause injury.
-
Make sure the power supply isolator is turned off on
the power distribution panel when Fresh Master is not
used for a long period of time after the installation.
- It could cause electric shock, power leakage, or re
as a result of deteriorated insulation.
- Alwaysusethespeciedsuspensionbolts,nutsand
washers and correctly rated wire / chain hangers.
- Use of hardware with insufcient strength could result
in the product dropping.
- The outside ducts must be tilted at a gradient (1/30
ormore)downtowardtheoutdoorlouvresfrom
Fresh Master, and properly insulated.
- The entry of rain water may cause power leakage,
re, or damage to household property.
-
Thecontrolboxcovermustbeclosedaftertheinstallation.
- Dust or humidity may cause power leakage or re.
- Whenconnectingexternaldevices(electrically
operated damper, lamp, monitoring unit, etc.) using
output signals of the Fresh Master, make sure to
installsafetyequipmentfortheexternaldevices.
-
It could cause re, damage, etc. without safety equipment.
CAUTION
CAUTION
- When using the product where it is exposed to high temperatures
and humidity (40˚C) or higher, RH 80% or higher), or where fog
occurs frequently, moisture is likely to condense in the core, and may
result in condensation build up in the unit. The product should not be
used under such conditions.
- Outdoor air may enter the Fresh Master owing to the pressure
difference between indoor and outdoor or external winds even
when the product is not operated. It is recommended to install an
Electrically operated damper to block the outdoor air.
- In a cold weather area, an area with strong external winds or where
fog occurs frequently, cold outdoor air, external winds or fog may
be introduced into the product when its operation is stopped. It is
recommended to install an electrically operated damper.
- When using the product in an environment where there is a window,
or opening near the outdoor louvre , where insects are likely to
gather around the interior or exterior light , take note that small
insects may intrude into the product.
- In a cold weather area, or others, dewing or freezing could occur
on the main unit, where the duct is connected, or other sections,
depending on the conditions of outdoor air and indoor temperature
and moisture, even if they are within the range of operating conditions.
Make sure to conrm the operating conditions and other precautions,
and do not use the product if dewing or freezing is anticipated.
* Example of dewing condition - Outdoor air: -5˚C or lower, dew-point
temperature at installation place: 10˚C or higher (When the indoor temperature
is 22˚C or higher with the relative humidity higher than 50%, or other)
The instructions
given must be
followed.

3
ENGLISH
- Neverrepairtheunitortransferittoanothersitebyyourself.
If repair is performed improperly, water leakage, electric
shockorremayresult.Ifyouneedtohavetheunitrepaired
ormoved,consultyourdealer.
1) Outdoor unit
Warning:
- Theoutdoorunitmustbeinstalledonastable,levelsurface,
inaplacewherethereisnoaccumulationofsnow,leavesor
rubbish.
- Do not stand on, or place any items on the unit. You may fall
down or the item may fall, causing injury.
Caution:
- The outdoor unit should be installed in a location where air
and noise emitted by the unit will not disturb the neighbours.
2) Fresh Master
Warning:
- The Fresh Master should be securely installed. If the unit is
loosely mounted, it may fall, causing injury.
- Installtheunitonarigidstructuretopreventexcessiveop-
erationsoundorvibration.
3) Remote controller
Warning:
- The Remote controller should be installed in such a way that
children cannot play with it.
4) Drain hose
Caution:
- Make sure that the drain hose is installed so that drainage
can go ahead smoothly. Incorrect installation may result in
water leakage, causing damage to furniture.
5) Refrigerant pipe
Warning:
- Be sure to wrap insulation around the piping. Direct contact
with the bare piping may result in burns or frostbite.
6) Power Supply, fuse or circuit isolator
Warning:
- Make sure that the unit is powered by a dedicated power sup-
ply. Other appliances connected to the same power supply
couldcauseanoverload.
- Make sure that there is a mains power switch.
- Besuretoadheretotheunit'svoltageandfusecircuitisola-
torratings.Neveruseacableorafusewithahigherrating
thantheonespecied.
7) Grounding
Caution:
- Theunitmustbeproperlygrounded.Neverconnectthe
grounding wire to a gas pipe, water pipe, lightning conduc-
tor or telephone grounding wire. If the unit is not grounded
properly, electric shock may result.
- Check frequently that the ground wire from the outdoor unit
is properly connected to both the unit's ground terminal and
the grounding electrode.
1.2. Precautionsfordevicesthatuse
R407C refrigerant
Caution:
- Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping con-
tains a large amount of chlorine which may cause the refrigera-
tor oil of the new unit to deteriorate.
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidizedcopperasspeciedintheJISH3300“Copperand
copper alloy seamless pipes and tubes”. In addition, be sure
that the inner and outer surfaces of the pipes are clean and
freeofhazardoussulphur,oxides,dust/dirt,shavingpar-
ticles, oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause
the refrigerant residual oil to deteriorate.
- Store the piping to be used during installation indoors and
keepbothendsofthepipingsealeduntiljustbeforebrazing.
(Store elbows and other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of
the oil and compressor trouble may result.
- Useesteroil,etheroiloralkylbenzene(smallamount)same
astherefrigeratoroiltocoataresandangeconnections.
- The refrigerator oil will degrade if it is mixed with a large
amount of mineral oil.
- Useliquidrefrigeranttollthesystem.
- If gas refrigerant is used to seal the system, the composition of
the refrigerant in the cylinder will change and performance may
drop.
- Do not use a refrigerant other than R407C.
- If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the refrigerator oil to deteriorate.
- Useavacuumpumpwithareverseowcheckvalve.
- The vacuum pump oil may ow back into the refrigerant cycle
and cause the refrigerator oil to deteriorate.
- Donotusethefollowingtoolsthatareusedwithconvention-
al refrigerants.
 (Gaugemanifold,chargehose,gasleakdetector,reverseow
checkvalve,refrigerantchargebase,vacuumgauge,refriger-
antrecoveryequipment)
- If the conventional refrigerant and refrigerator oil are mixed in
the R407C, the refrigerant may deteriorate.
- If water is mixed in the R407C, the refrigerator oil may deterio-
rate.
- Since R407C does not contain any chlorine, gas leak detectors
for conventional refrigerants will not react to it.
- Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deterio-
rate.
- Be especially careful when managing the tools.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant
may deteriorate.
- Refrigerantleakagemaycausesuffocation.Provideventila-
tioninaccordancewithEN378-1.
1.3. Precautionsfordevicesthatuse
R410A refrigerant
- Make sure to use new refrigerant piping.
- When using the existing piping which used R22, take care of
the following points.
- Replace the are nut with that is attached to the product. Flare
section must be nished with the are processing. (See P.10.)
- Use of piping with thin wall should be avoided. (See P.10.)
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidizedcopperasspeciedintheJISH3300“Copper
and copper alloy seamless pipes and tubes”. The pipes must
havethewallthicknessasshowninthetablebelow.Inad-
dition, be sure that the inner and outer surfaces of the pipes
arecleanandfreeofhazardoussulphur,oxides,dust/dirt,
shavingparticles,oils,moisture,oranyothercontaminant.

4
ENGLISH
ø6.35, Wall thickness 0.8 mm ø9.52, Wall thickness 0.8 mm
ø12.7, Wall thickness 0.8 mm ø15.88, Wall thickness 1.0 mm
It is strictly prohibited to use pipes with thin wall not listed in
theabovetable.
If the inside of pipe is contaminated, it could cause deterioration
of refrigerator oil, or other problems.
- Store the piping to be used during installation indoors and
keepbothendsofthepipingsealeduntiljustbeforebrazing.
(Store elbows and other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration
of the oil and compressor trouble may result.
- Useesteroil,etheroiloralkylbenzene(smallamount)same
astherefrigeratoroiltocoataresandangeconnections.
- The refrigerator oil will degrade if it is mixed with a large
amount of mineral oil.
- Do not use a refrigerant other than R410A.
- If another refrigerant (R22, etc.) is used, the chlorine in the refrig-
erant may cause the refrigerator oil to deteriorate.
- Useavacuumpumpwithareverseowcheckvalve.
- The vacuum pump oil may ow back into the refrigerant cycle
and cause the refrigerator oil to deteriorate.
- For the following tools, use only the tools special to the
refrigerant R410A.
- Tools as listed in the following table are required for the refrig-
erant R410A. Tool name (For R410A)
Gauge manifold Flare tool
Charging hose Protrusion adjust copper pipe gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Balance for refrigerant charging
- Be especially careful when managing the tools.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant
may deteriorate.
- Do not use a charging cylinder.
-
Using a charging cylinder may cause the refrigerant to deterio-
rate.
- Refrigerantleakagemaycausesuffocation.Provideventila-
tioninaccordancewithEN378-1.
1.4. Before conducting supply pipe
and drain pipe work
[Supply pipe work is not required for GUF-50, 100RD4]
Caution:
- Thewaterqualityofthepermeablelmhumidier'ssupply
watershouldmeetpublicwaterworksstandards,andhavea
hardness less than 100 mg/ . If the supply water does not
meetthesestandards,useadeionizer.
- The supply pressure must be within the range of 2×104pa to
49×104pa.
- Supply pressure that is lower than the specied range will cause
the water to not supplied the permeable-lm humiditier, and the hu-
midier may not work. Supply pressure that exceeds the specied
range may cause damage to the solenoid valve and result in water
leaks.
- Drain pipe gradient must be more than 1/100.
- Drain water will not be properly discharged.
- Forareasthatareextremelycoldinwinter,performfreeze-
preventiononthesupplypipebywrappingafreezepreven-
tion heater and thermal insulation.
- Cold temperatures may freeze water, and damage supply pipe.
- Install the drain piping according to this installation Manual
to ensure proper drainage. Wrap thermal insulation around
thepipestopreventcondensation.
- Improper drain piping may cause water leakage and damage to
furniture and other possessions.
1.5. Before getting installed
Caution:
- Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion
may result.
- Do not use the Fresh Master where food, pets, plants, preci-
sion instruments, or artwork are kept.
- The quality of the food, etc. may deteriorate.
- DonotusetheFreshMasterinspecialenvironments.
- Oil, steam, sulfuric smoke, etc. can signicantly reduce the
performance of the Fresh Master or damage its parts.
- When installing the unit in a hospital, communication station,
orsimilarplace,providesufcientprotectionagainstnoise.
- The inverter equipment, private power generator, high-frequency
medical equipment, or radio communication equipment may
cause the Fresh Master to operate erroneously, or fail to oper-
ate. On the other hand, the Fresh Master may affect such equip-
ment by creating noise that disturbs medical treatment or image
broadcasting.
- Do not install the unit on a structure that may cause leakage.
- When the room humidity exceeds 80% or when the drain pipe
is clogged, condensation may drip from the Fresh Master.
Perform collective drainage work together with the outdoor unit,
as required.
1.6. Beforegettinginstalled(moved)-
electrical work
Caution:
- Ground the unit.
- Do not connect the ground wire to gas or water pipes, lightning
rods, or telephone ground lines. Improper grounding may result
in electric shock.
- Install the power cable so that tension is not applied to the cable.
- Tension may cause the cable to break and generate heat and
cause a re.
- Install an leak circuit isolator, as required.
- If an leak circuit isolator is not installed, electric shock may
result.
- Usepowerlinecablesofsufcientcurrentcarryingcapacity
and rating.
- Cables that are too small may leak, generate heat, and cause a
re.
- Useonlyacircuitisolatorandfuseofthespeciedcapacity.
- A fuse or circuit isolator of a larger capacity or a steel or copper
wire may result in a general unit failure or re.
- Do not wash the Fresh Master.
- Washing them may cause an electric shock.
- Be careful that the installation base is not damaged by long
use.
- If the damage is left uncorrected, the unit may fall and cause
personal injury or property damage.
- Beverycarefulaboutproducttransportation.
- Only one person should not carry the product if it weighs more
than 20 kg.
- Fresh Master use PP bands for packaging. Do not use any PP
bands for a means of transportation. It is dangerous.
- Do not touch the heat exchanger ns. Doing so may cut your
ngers.
- When transporting the outdoor unit, suspend it at the specied
positions on the unit base. Also support the outdoor unit at four
points so that it cannot slip sideways.
- Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden
parts, may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that chil-
dren can not play with them. If children play with a plastic bag
which was not torn apart, they face the risk of suffocation.

5
ENGLISH
The unit is provided with the following accessories:
No. Accessories Qty
1Pipe insulation 2
2Flare insulation 2
3Tie band 4
4Duct connecting anges 4
5Mounting screws 16
3. Outline drawings
2. Accessories
G
P
ML
20
100
øH
øJ
C
(N) A
FE
ND
B
79 79
N
T
150 - 250
60
Q
79
R30
K
Air exhaust fan
Damper plate
Air supply fan
Ceiling suspension xture
(4-13×30 length hole for GUF-50RDH4, 50RD4)
Ceiling suspension xture (4-15×30 length hole for GUF-100RDH4, 100RD4)
RA
(Return air)
Control box
Maintenance cover
EA
(Exhaust air)
High efciency lter
(Optional part)
Gas pipe
Drain discharge hole
(VP25 connection)
Lossnay core
Liquid pipe
Heat exchanger
Air lters
SA
(Supply air)
OA
(Outdoor air)
Ceiling suspension xture Maintenance cover
Location at which the duct direction can be changed
Lossnay core
Air lter
High efciency lter
Fan
Maintenance space
Inspection
opening Inspection opening
Solenoid valve unit with
pressure regulator*
Solenoid valve
Heat exchange unit
Humidifying element
Maintenance space
Power cable instal-
lation port
Can install upper area of ceiling suspension xture
(GUF-100RDH4, 100RD4)
Location at which the duct direction can be changed
Humidifying element*
S (Water intake)
(Discharge hole)
Water intake strainer
with check valve*
(PT1/2 External thread)
More than 600
(* GUF-50, 100RDH4 only)
Unit (mm)
Model External dimension Ceiling suspension
xture pitch Duct connection ange Duct pitch Humidication
Inspection
opening
Weight
(kg)
A B C D E F
Nominal
diameter
G H J K L M N P Q R S T
GUF-50RDH4,
GUF-50RD4 1288 1016 317 1185 1048 22 200 158.5 192 208 745 372.5 435 124 347 135 99 266 450 57
(54)
GUF-100RDH4,
GUF-100RD4 1580 1231 398 1465 1271 16 250 199 242 258 920 460 670 149 361 169 110 280 600 98
(92)
*Values shown in parentheses “( )” are for RD4.
1.7. Before starting the test run
Caution:
- Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power
switch can result in severe damage to internal parts. Keep the
power switch turned on during the operational season.
- Donottouchtheswitcheswithwetngers.
- Touching a switch with wet ngers can cause electrication.
- Do not touch the refrigerant pipes during and immediately after operation.
- During and immediately after operation, the refrigerant pipes are may be
hot or cold, depending on the condition of the refrigerant owing through
the refrigerant piping, compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the refrigerant pipes.
- Do not operate the Fresh Master and outdoor unit with the
panelsandguardsremoved.
- Rotating, hot, or high-voltage parts can cause injuries.
- Do not turn off the power immediately after stopping operation.
- Always wait at least ve minutes before turning off the power.
Otherwise, water leakage and trouble may occur.

6
ENGLISH
4. Selecting an installation site
- Select a site with sturdy xed surface sufciently durable against
the weight of unit.
- Before installing unit, the route to carry the unit to the installation
site should be determined.
- Select a site where the unit is not affected by entering air.
- Select a site where the ow of supply, return, exhaust and outdoor
air is not blocked.
- Select a site where refrigerant piping and exhaust/outdoor ducts
can easily be led to the outside.
-
Select a site which allows the supply air to be distributed fully in
room.
- Select a location where the inspection opening can be installed.
-
Do not install unit at a site with oil splashing or steam in large quanti-
ties .
- Do not install unit at a site where combustible gas may generate,
ow in, stagnate or leak.
-
Do not install unit at a site where equipment generating high frequen-
cy waves (a high frequency wave welder for example) is provided.
- Do not install unit at a site where re detector is located at the
supply air side. (Fire detector may operate erroneously due to the
heated air supplied during heating operation.)
- When special chemical product may be scatter all around such
as site chemical plants and hospitals, full investigation is required
before installing unit. (The plastic components may be damaged
depending on the chemical product applied.)
- Do not install this product in a refrigerated warehouse, heated
swimming pool or other location where the temperature and hu-
midity are signicantly different.
(Failure to heed this warning may result in electrical shock or
malfunction.)
- The electro-magnetic susceptibility has been chosen at a level
that gains proper operation in residential areas, on business and
light industrial premises and on small-scale enterprises, inside as
well as outside of the buildings. All places of operation are charac-
terised by their connection to the public low voltage power supply
system.
5. Installing the Fresh Master
5.1. Fixing hanging bolts
(Use M10 or M12 hanging bolts. The bolts and washers should be
supplied in the eld.)
(Give site of suspension strong structure.)
Hanging structure
- Ceiling: The ceiling structure varies from one building to another.
For detailed information, consult your construction company.
1 Reinforcing the ceiling with additional members (edge beam,
etc.) must be required to keep the ceiling at level and to prevent
the ceiling from vibrations.
2Cut and remove the ceiling members.
3 Reinforce the ceiling members, and add other members for xing
the ceiling boards.
- Mount the washers (outer diameter of >21 mm for M10, >24 mm
for M12) and nuts obtained from a eld supply onto the pre-
recessed hanging bolts (M10 or M12) also obtained from a eld
supply, as shown in the gure.
4.1. Install the Fresh Master on a ceiling
strong enough to sustain its weight
Warning:
- The unit must be securely installed on a structure that can
sustain its weight. If the unit is mounted on an unstable
structure, it may fall down causing injuries.
4.2. Securinginstallationandservice
space
- Select the optimum direction of supply airow according to the
conguration of the room and the installation position.
- As the piping and wiring are connected at the side surfaces, and
the maintenance is made at the same surfaces, allow a proper
space properly. For the efcient suspension work and safety,
provide a space as much as possible.
4.3. Standard installation examples
EA
(exhaust)
Maintenance
space
Exhaust grille
Hanging bolt location
Inspection opening
Supply grille
OA
(outdoor)
Duct downward
gradient to wall
(more than 1/30)
Cistern tank Deionizer
Duct (provided by
customer) Hanging bolt
(provided by customer)
Deep hood or
weather cover
EA
(exhaust)
OA
(outdoor)
Drain pipe gradient to wall
(more than 1/100)
Supply pipe Inspection
opening
Servicing
valve Exhaust
grille
Supply
grille
RA
(return) SA (supply)
Hanging bolt (M10 or M12)
Nut
Washer
Nut

7
ENGLISH
5.2. Attaching the duct connecting
anges
Use the screws supplied to secure the duct connecting anges to the
Fresh Master.
Caution:
- Beforeattachingtheductconnectinganges,checkthatno
foreignmatter(scrapsofpaper,vinyl,etc.)hasfounditsway
inside the main unit.
- Replacethescrewsthatwereremovedwhentheductcon-
nectingangewasremovedbackinplaceandsecurely
tighten them.
5.3. Hanging the unit body
1. Hang the ceiling suspension xtures on the hanging bolts and
adjust in such a way that the main unit is level.
2. Tighten up securely using double nuts in order to prevent loose-
ness.
Caution:
- When suspending the main unit from the ceiling, do not
handle it in such a way that force will be applied to the con-
trol box.
- Fastenthebodysothatitisorientedhorizontally.(within1°)
5.4. When changing the direction of
theoutdoorsideduct(EA/OA)
Removetheangecoverandsuspensionxture.
1. Remove the four mounting screws for the ange cover and re-
move the ange cover.
2. Remove the screws at the top mounting position.
3. Remove the ceiling suspension xtures and attach them at higher
mounting positions.
4. Tighten up the screws in the screw hole where the ceiling suspen-
sion xtures were removed in order to prevent air leaks.
Mounting screw
Duct connecting ange
Mountingtheductconnectionange
1. Use the mounting screws provided to mount the duct connection
ange to the main body.
2. Use the four mounting screws that were removed to attach the
ange cover.
5.5. Connecting the ducts
1. Fit the ducts securely into the duct connecting anges, and wind
aluminium tape available from a eld supply around them to pre-
vent air leaks.
2. Suspend the ducts from the ceiling so that their weight will not be
applied to the Fresh Master.
3. The exhaust/outdoor and supply ducts must be covered with heat-
insulating material in order to prevent condensation from forming.
Caution:
- The main unit is equipped with connection locations for equi-
potential connection of ducts.
- Down ward gradient of outdoor duct: 1/30 or more (toward
wall side)
- Provisionofdistancefortheexhaust/outdoorductsintable
below(topreventrainwaterfromseepingin)
Model Distance
GUF-50RDH4, GUF-50RD4 1 m or more
GUF-100RDH 4 , GUF-100RD 4 2.5 m or more
- Before connecting the ducts, check that no sawdust or any
otherforeignmatter(scrapsofpaper,vinyl,etc.)hasfound
its way inside the ducts.
- Do not touch the damper plate inside the main unit when con-
necting the ducts.
- Do not install the ducts in the ways illustrated below. Do-
ingsowillreducetheairvolumeandgiverisetoabnormal
sounds.
Duct
Taping
Aluminium tape
Heat-insulating material
Exhaust/outdoor/supply ducts
Duct connecting ange
Main unit
- Extremely
sharp bends
- Multiple bends
- Bends right next
to the outlet
- Extreme reduction in
the diameter of the
connected ducts
Fresh Master
Nut Washer Celling suspension xture
GUF-100RDH4
GUF-100RD4 GUF-50RDH4 GUF-50RD4
Screw
Flange cover Ceiling suspension xture
Screw

8
ENGLISH
6. Supply pipe and drain pipe work
Supply pipe work is not required for GUF-50, 100RD4. Only perform
the drain pipe work.
6.1. Supply pipe work
1. Connect a commercially available interlocked exible metal hose
or the equivalent between the water supply pipe and the water ller
hole when performing pipe work for the water supply.
- Set the water pressure between 2×104Pa to 49×104Pa.
- Install the servicing valve near the strainer then install the
supply pipe.
Caution:
- The supply water should meet public waterworks standards,
andhaveahardnesslessthan100mg/ , otherwise the hu-
midierwillclogup.
- Installthedischargeandservicingvalveinlocationsacces-
sible from the inspection opening.
- Securely lock the supply pipe so that no force is applied to
the strainer.
- When performing the supply pipe work, wash the pipe with
freshwaterpriortoinstallationtopreventsawdust,etc.from
entering,orinstalladischargevalveinthepipingandsuf-
ciently conduct water discharge before using until the water is
clear.
- Take caution as to not let cutting oil or detergent from entering.
- The supply and drain pipes must be installed as such that
theydonotrestontheMaintenancecoverandcover(humidi-
er).
- The supply and drain pipes must be properly installed so that
there is no water leak.
- Topreventfreezingwhennotusingtheunitforlongperiods
oftime,closetheservicingvalve,openthedischargevalve,
andremovetheservicingvalveandanywaterintheunit's
supplywaterentrance.Afterremovingtheservicingvalve
andwater,closethedischargevalve.
2. Freeze-prevention work for extremely cold areas
Perform freeze prevention by wrapping a freeze-prevention
heater (eld supply) on the supply pipe.
-
Wrap a freeze-prevention heater all the way to the Fresh Mas-
ter.
- Insulation work must be performed upon the heater as well.
Wrapping the freeze-prevention
heater.
6.2. Drain pipe work
1. Connect a vinyl chloride VP25 elbow to the drain discharge port.
2. The drain pipe must be properly insulated from the drain dis-
charge port.
Caution:
- The pipe must be installed with gradient of more than 1/100.
- The drain pipe must be installed so that water does not ac-
cumulate inside.
- Check to make sure that the end of the drain pipe is at a
location where discharge is possible and that the pipe can be
properly drained.
- Do not install the drain pipe as shown below.
 (Thiswillresultininsufcientdrainage)
- Do not insert the tip of the drain pipe into a gutter or the like.
Doingsowillcausetheguttertofreezeintheeventofheavy
snowfall, resulting in water leakage from the main unit.
3. Make sure the pipe drains water properly.
(1) Remove the maintenance cover (for humidifying).
- Remove the seven mounting screws, slide the maintenance
cover to the right, and remove it from the potbelly-shaped
holes (six locations for Model 50).
(2) Pull out the inner lid.
(3) Pour approximately 1,000 cc of water onto the drain tray.
(4) Conrm that the drain pipe drains away water at the pipe's nal
exit.
(5) Replace the inner lid and the maintenance cover (for humidify-
ing).
* The diagram shows GUF-50, 100RDH4
Drain discharge port
VP25 elbow
Drain pipe (gradient: 1/100 or more)
Vinyl chloride pipe VP25
→
Drained
water
Odor trap
Air-bleeding
→
Drained
water
Pass-over
Maintenance Cover
(humidier)
Drain tray
Water supply
hose
(eld supply)
Inner lid
Supply pipe
Servicing valve
Discharge valve
Cap

9
ENGLISH
7. Refrigerant pipe work
Warning:
Neverchargeanytypesofrefrigerantotherthanthosespeci-
edbyMitsubishiElectric.Failuretofollowthiswarningmay
resultinviolationoflaw,orblowout,explosionorrewhenthe
productisused,serviced,ordisposedof.Thetypesofrefriger-
antthatcanbeusedarespeciedinthemanualsuppliedwith
theproductorontheproductnameplate.MitsubishiElectric
shall assume no liability for any damage, breakdown, malfunc-
tion, or accident resulting from the charging of a refrigerant not
speciedbyMitsubishiElectric.
7.1. Refrigerantpipespecications
To avoid dew drops, provide sufcient insulation to the refrigerant
and drain pipes.
When using commercially available refrigerant pipes, be sure to use
commercially available insulation (with a heat-resisting temperature
of more than 120°C and thickness given below) onto both liquid and
gas pipes.
Be also sure to use commercially available insulating material (with
a formed polyethylene's specic gravity of 0.03 and thickness given
below) onto all pipes which pass through rooms.
1 Select the thickness of insulating material by pipe size.
Pipe size Insulating material's thickness
6.4 mm to 25.4 mm More than 12 mm
28.6 mm to 38.1 mm More than 15 mm
2If the unit is used on the highest story of a building and under
conditions of high temperature and humidity, it is necessary
to use pipe size and insulating material's thickness more than
those given in the table above.
e.g. 30 mm thickness is necessary under 30°C and 80%RH.
3 If there are customer's specications, simply follow them.
4 Refrigerant pipe specications
Model
Item GUF-50RDH4
GUF-50RD4 GUF-100RDH4 GUF-100RD4
Refrigerant pipe
(Flare connection) Liquid pipe ø6.35 ø9.52
Gas pipe ø12.7 ø15.88
5 Torque specications
Outerdia of copper pipe Tightening torque
ø6.35 14 - 18 N.m
ø9.52 34 - 42 N.m
ø12.7 49 - 61 N.m
ø15.88 68 - 82 N.m
6 Refrigerant system diagram
Gas pipe thermistor TH3
Liquid pipe thermistor TH2
Strainer Flare con-
nection
Heat exchanger
Strainer Linear expansion valve
7.2. Refrigerant piping work
This piping work must be done in accordance with the installation
manuals for both outdoor unit and BC controller (simultaneous cool-
ing and heating series R2).
- With R2 systems connect Fresh Masters to BC controllers.
- For constraints on pipe length and allowable difference of eleva-
tion, refer to the outdoor unit manual.
- The method of pipe connection is are connection.
- After nishing the piping work, check gas leakage.
Cautions On Refrigerant Piping
Besuretousenon-oxidativebrazingforbrazingtoensure
that no foreign matter or moisture enter into the pipe.
Besuretoapplyrefrigeratingmachineoiloverthearecon-
nection seating surface and tighten the connection using a
double spanner.
Provideametalbracetosupporttherefrigerantpipesothat
no load is imparted to the Fresh Master end pipe. This metal
braceshouldbeprovided50cmawayfromtheFreshMas-
ter’sareconnection.
Warning:
Wheninstallingandmovingtheunit,donot
charge it with refrigerant other than the refrigerant
(R410A,R407C)speciedontheunit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant
cycle to malfunction and result in severe damage.
Caution:
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidizedcopperasspeciedintheJISH3300“Copperand
copper alloy seamless pipes and tubes”. In addition, be sure
that the inner and outer surfaces of the pipes are clean and
freeofhazardoussulphur,oxides,dust/dirt,shavingpar-
ticles, oils, moisture, or any other contaminant.
- Neveruseexistingrefrigerantpiping.
- The large amount of chlorine in conventional refrigerant and
refrigerator oil in the existing piping will cause the new refriger-
ant to deteriorate.
- Store the piping to be used during installation indoors and
keepbothendsofthepipingsealeduntiljustbeforebrazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will
deteriorate and the compressor may fail.
- Useesteroil,etheroiloralkylbenzene(smallamount)asthe
refrigeratoroiltocoataresandangeconnections.(Forus-
ing R407C, R410A)
- The refrigerant used in the unit is highly hygroscopic and mixes
with water and will degrade the refrigerator oil.

10
ENGLISH
- Make sure to use new refrigerant piping.
- When using the existing piping which used R22, take care of
the following points.
- Replace the are nut with that is attached to the product. Flare
section must be nished with the are processing.
- Use of piping with thin wall should be avoided.
A
Pipe Dia. (mm) Dimension A (mm) R410A Flare Tool When using conventional are tool (R407C)
Rigid (clutch type) Imperial (wing nut) type
ø6.35 (1/4”) 0~0.5 1.0 - 1.5 1.5 - 2.0
ø9.52 (3/8”) 0~0.5 1.0 - 1.5 1.5 - 2.0
ø12.7 (1/2”) 0~0.5 1.0 - 1.5 1.5 - 2.5
ø15.88 (5/8”) 0~0.5 1.0 - 1.5 1.5 - 2.5
* When applying the are processing for the refrigerant R410A using conven-
tional tools, conduct the work referring to the above. If you use the copper
pipe gauge for the adjustment of protrusion margin, you can secure the
dimension A.
Copper pipe
Dise
øB
R0.4~R0.8
Copper Pipe O.D.
ø6.35
ø9.52
ø12.7
ø15.88
8.7~9.1
12.8~13.2
16.2~16.6
19.3~19.7
Flare Dimension
Dimension øB(
mm )
Coat small amount of ester oil, ether oil or hard alkylbenzen oil over
the entire periphery of are seat surface.
* Do not coat at the threaded section.
(Otherwise, you cannot lock the are nut securely.)
* Make sure to use only the are nut attached to the main unit. (Off-the-shelf
product could be cracked.)

11
ENGLISH
7.3. Request for application of insula-
tiontotheconnectorsoftheeld
refrigerant pipe
Check if the parts listed below are included in the package before
installation.
Flare insulation Pipe insulation Tie band
2 pieces 2 pieces 4 pieces
Locally Procured Materials
(Refrigerant pipe, Tape for piping installation)
After the refrigerant pipe connection is complete,
besuretoapplyinsulationtotheconnector(are
connection) using the attached insulated pipe as
showninthegurebelow.
- Makesurenottoleaveagapbetweentheinsulatedpipeand
theindoorunitaswellastheinsulatedpipeandtheeld
refrigerant piping.
- Faulty insulation application may cause condensation to form
resulting in water leakage.
1. Insert the are nut in the eld refrigerant piping, pull the insulating
material when performing flare pipe expansion, and put the
insulating material back so that the copper pipe is not exposed.
* Condensation may occur.
2. Wrap the insulating material around the are connection and the
eld refrigerant piping (no gap should exist) and temporarily x
using the tape for piping construction. (It will be clipped by the
insulating pipes described in the step 3 to x.)
Insulating
material
Insulating
material Pull
Flare nut Put it back
Insulating
material Flare nut
* No gap should exist
Insulating
material
Field refrigerant
piping
* No gap should exist on
the refrigerant piping body
(Condensation may occur)
3. Wrap the insulated pipe around the are area and x the
each insulating pipe with a tie band.
* Be sure to perform construction so as not to leave a gap on
the insulated pipe joint area. (Condensation may occur in
the ared area.)
4. Wrap the tape for piping construction around the joint between
the insulated pipe and the eld refrigerant piping to prevent the
insulated joint from being exposed.
Insulating material
can stick out from
the insulated pipe
Insulated
pipe
Body side
panel
* No gap should exist
on the unit body
Field refrigerant
piping
Unit body
Joint is the upper
side (Target: Within
the range of 30°
right or left from the
right above)
* No gap
should exist
(Condensation
may occur)
Insulated pipe * No gap should exist
(Condensation may
occur)
Tie band
[Good
example] [Bad example]
Unit (mm)
Field refrigerant
piping
(Locally prepared)
Tape wrapped area
Unit body

12
ENGLISH
8.Electricalwiring
8.1. Precautionsonelectricalwiring
Warning:
- Electricalworkshouldbedonebyqualiedelectricalengi-
neersinaccordancewith“EngineeringStandardsForElectri-
cal Installation” and supplied installation manuals. Special
circuits should also be used. If the power circuit lacks capac-
ity or has an installation failure, it may cause a risk of electric
shockorre.
1. Be sure to take power from the special branch circuit.
2. Be sure to install an earth leakage isolator to the power.
3. Install the unit to prevent that any of the control circuit cables (Re-
mote controller, transmission cables) is brought in direct contact
with the power cable outside the unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, Remote controller, transmission cables)
above the ceiling may be bitten by mice. Use as many metal pipes
as possible to insert the cables into them for protection.
6. Never connect the power supply cable to leads for the transmis-
sion cables. Otherwise the electronic circuit would be broken.
7. Be sure to connect control cables to the Fresh Master, Remote
controller, and the outdoor unit.
8. Put the unit to the ground on the outdoor unit side.
9. Select control cables from the conditions given below.
Caution:
- Be sure to put the unit to the ground on the outdoor unit side.
Do not connect the earth cable to any gas pipe, water pipe,
lightening rod, or telephone earth cable. Incomplete ground-
ing may cause a risk of electric shock.
8.2. Typesofcontrolcables
1.WiringM-NETtransmissioncables
- Types of transmission cables
Design wiring in accordance with the following table <Table 1>.
- Cable cross-sectional area 1.25 mm2to 2.00 mm2
<Table 1>
System conguration For a single-refrigerant system For a multi-refrigerant system
Transmission cable length Less than 120 m More than 120 m Regardless of length
Facility example
(for noise judgment) Residence or independent store without noise
Building, clinic, hospital or communica-
tions station without noise supposedly
generated from inverter equipment,
private power generator, high-frequency
medical equipment, radio-used com-
munications equipment and so on
All facilities
Types of transmission
cables
VCTF, VCTFK, CVV,
CVS, VVR, VVF, VCT or
shielding wire CVVS or
CPEVS Shielding wire CVVS or CPEVS
2. Remote controller cables
MA Remote controller (PAR-21MAA) ME Remote controller (PAR-F27MEA, PAC-SE51CRA)
Wire Type
Type VCTF, VCTFK, CVV, CVS,
VVR, VVF, VCT
10 m or shorter If the length exceeds 10 m.
VCTF, VCTFK, CVV, CVS,
VVR, VVF, VCT M-NET transmission cable
Number of conductors 2-conductor cable
Wire diameter 0.3 - 1.25 mm2(Note 1) 0.3 - 1.25 mm2(Note 1)
(0.75 - 1.25 mm2) (Note 2)
Total Length Max. 200 m Max. 10 m
If the length exceeds 10 m, keep the
length within the maximum length of
communicationslinesbetweenindoor
and outdoor units.
Note1 For work purposes, a wire diameter of 0.75 mm2is recommended.
Note2IfyouarerunningthewirestothePAC-SE51CRAterminalblock,usethewirediametershownin().

13
ENGLISH
8.3. Electricalwiringdiagram
GUF-50, 100RDH4
NOTE 1. TM1, TM2, TM3 shown in dotted lines are eld work.
2. Be sure to connect the grounding wire.
3. Isolator should be provided by the customer.
4. MARK : indicates terminal block, : connector
: board insertion connector or fastening connector of control board.
C
C
FUSE1
<PAR-F27MEA>
<PAR-21MAA>
Remote Controller
L
N
TM2
TM3
PE
N
Uncharged a-contact
Humidistat
240VAC more than 10mA
31
Operation monitor output
AC240V 1A AC220V 100mA
DC 24V 1A DC 5V 100mA
MAX MIN
Malfunction monitor output
MAX MIN
AC240V 1A AC220V 100mA
DC 24V 1A DC 5V 100mA
Shield wire
M-NET Remote controller
Fresh Master
To Outdoor Unit, BC Controller
X09
X08
M-NET transmission cable
DB901
1
6
7
1
5
1
5
1
ZNR901ZNR902 DSA1
X05
X04
X07
X06
X03
X02
POWER SUPPLY
RSV(1kΩ)
TM1
L
Liquid
pipe
TH2
Gas
pipe
TH3
SUPPLY FAN
EXHAUST FAN 250V 6.3A
1
3
1
3
ISOLATOR
LED3
8
S
B
A
2
7
9
10
11
BROWN BROWN
BLUE
RED
BLUE
BROWN
FAN1
FAN4
TR
CN3T
CNT
CND1 CND2
GREEN/YELLOW
1
12
TH4(RA)
TH1(OA)
YELLOW
YELLOW
BLACK
BLACK
PINK
PINK
GRAY
GRAY
YELLOW
YELLOW
ORANGE
ORANGE
BLUE
WHITE
RED
BLACK
PINK
BLACK
PINK
BLUE
WHITE
RED
CN22
CN29
CN21
SW1
SW2
SW3
SW12
LED1
LED2
SW11
SW14
CN20
SV1
SV2
LS
W.S
GM
M1
M2
RED
RED
PURPLE
PURPLE
BROWN
RED
PURPLE
ORANGE
PINK
WHITE
LEV CN60
CN70
CNL
CN27
CN4D
RED
RED
FAN2
FAN3
220-240V 50Hz
-
+
Warning
Before obtaining access to terminals, all supply circuits
must be disconnected.
SYMBOLEXPLANATION
Symbol Name Symbol Name Symbol Name
M1
M2
C
W.S
SV1
SV2
TH1
TH2
TH3
TH4
LEV
RSV
Fan motor (exhaust)
Fan motor (supply)
Capacitor
Water sensor
Solenoid valve (pressure regulator)
Solenoid valve (exhaust)
Thermistor (outdoor air temp. detection)
Thermistor (pipe temp. detection/liquid)
Thermistor (pipe temp. detection/gas)
Thermistor (room air temp. detection)
Electronic linear expansion valve
Resistance(solenoid valve)
TM1
TM2
TM3
SW1
SW2
SW3
SW11
SW12
SW14
1, 2
A, B
S
Terminal block (power supply)
Terminal block (transmission)
Terminal block (humidistat, monitor)
Switch (function selection)
Switch (capacity code setting)
Switch (function selection)
Switch (1st digit address set)
Switch (2nd digit address set)
Switch (branch NO. set)
Remote control terminal
M-NET transmission terminal
Shield
CND1, CND2
X02-X09
TR
GM
LS
LED1
LED2
LED3
Connector (power supply)
Relay
Transformer
Damper motor
Limit switch
Power supply monitor
MA Remote controller Power
supply monitor
M-NET Power supply monitor

14
ENGLISH
GUF-50,100RD4
-
+
C
C
AC240V 1A AC220V 100mA
DC 24V 1A DC 5V 100mA
MAX MIN
Malfunction monitor output
MAX MIN
AC240V 1A AC220V 100mA
DC 24V 1A DC 5V 100mA
TM1
<PAR-F27MEA>
L
<PAR-21MAA>
Remote Controller
220-240V 50Hz
N
L
TM2
TM3
PE
N
31
Operation monitor output
Shield wire
M-NET Remote controller
Fresh Master
To Outdoor Unit, BC Controller
X09
X08
M-NET transmission cable
DB901
1
6
7
1
5
1
5
1
ZNR901ZNR902 DSA1
X05
X04
X07
X06
X03
X02
POWER SUPPLY
Liquid
pipe
TH2
Gas
pipe
TH3
SUPPLY FAN
EXHAUST FAN
3
1
1
3
FUSE1
250V 6.3A
ISOLATOR
FAN4
TR
CN3T
CNT
CND1 CND2
GREEN/YELLOW
1
12
TH4(RA)
TH1(OA)
YELLOW
YELLOW
PINK
PINK
GRAY
GRAY
YELLOW
YELLOW
ORANGE
ORANGE
BLACK
PINK
BLUE
CN22
CN29
CN21
SW1
SW2
SW3
SW12
LED1
LED2
SW11
SW14
CN20
LS
W.S
GM
M1
M2
BROWN
RED
PURPLE
ORANGE
PINK
WHITE
LEV CN60
CN70
CNL
CN27
CN4D
FAN2
FAN3
LED3
S
B
A
2
7
8
9
10
11
BROWN BROWN BLUE RED
BLUE
BROWN
FAN1
RED
WHITE
PINK
BLACK
RED
WHITE
BLUE
BLACK
BLACK
NOTE 1. TM1, TM2, TM3 shown in dotted lines are eld work.
2. Be sure to connect the grounding wire.
3. Isolator should be provided by the customer.
4. MARK : indicates terminal block, : connector
: board insertion connector or fastening connector of control board.
Warning
Before obtaining access to terminals, all supply circuits
must be disconnected.
SYMBOLEXPLANATION
Symbol Name Symbol Name Symbol Name
M1
M2
C
W.S
TH1
TH2
TH3
TH4
LEV
Fan motor (exhaust)
Fan motor (supply)
Capacitor
Water sensor
Thermistor (outdoor air temp. detection)
Thermistor (pipe temp. detection/liquid)
Thermistor (pipe temp. detection/gas)
Thermistor (room air temp. detection)
Electronic linear expansion valve
TM1
TM2
TM3
SW1
SW2
SW3
SW11
SW12
SW14
1, 2
A, B
Terminal block (power supply)
Terminal block (transmission)
Terminal block (humidistat, monitor)
Switch (function selection)
Switch (capacity code setting)
Switch (function selection)
Switch (1st digit address set)
Switch (2nd digit address set)
Switch (branch NO. set)
Remote control terminal
M-NET transmission terminal
S
CND1, CND2
X02-X09
TR
GM
LS
LED1
LED2
LED3
Shield
Connector (power supply)
Relay
Transformer
Damper motor
Limit switch
Power supply monitor
MA Remote controller Power
supply monitor
M-NET Power supply monitor

15
ENGLISH
8.4. Powersupplywiring
Powercablesize:1.5mm2or more
[Selecting non-fuse isolator (NF) or earth leakage isolator (NV)]
To select NF or NV instead of a combination of Class B fuse with
switch, use the following:
- In the case of Class B fuse rated 15 A or 20 A,
NF model name (MITSUBISHI): NF30-CS (15 A) (20 A)
NV model name (MITSUBISHI): NV30-CA (15 A) (20 A)
Use an earth leakage isolator with a sensitivity of less than 30 mA
0.1 sec.
Caution:
- Do not use anything other than the correct capacity isola-
tor and fuse. Using fuse, wire or copper wire with too large
capacitymaycauseariskofmalfunctionorre.
8.5. ConnectingtheRemotecontrol-
ler, the Fresh Master and outdoor
transmission cables
(The Remote controller is optionally available.)
- Connect Fresh Master TM2 and outdoor unit TB3. (Non-polarized
2-wire)
The “S” on Fresh Master TM2 is a shielding wire connection. For
specications about the connecting cables, refer to the outdoor
unit installation manual.
- Install the Remote controller following the manual supplied with
the Remote controller.
[ForusingtheMERemotecontroller]
Connect the “A” and “B” on Fresh Master TM2 to the Remote
controller. (Non-polarized 2-wire) Connect the Remote controller's
transmission cable within 200 m. If the distance is more than 10 m,
use a 1.25 mm2to 2.0 mm2cable.
[For using the MA Remote controller]
Connect the “1” and “2” on Fresh Master TM2 to the Remote control-
ler. (Non-polarized 2-wire) Connect the Remote controller's transmis-
sion cable within 200 m.
S B A 2 1 S B A 2 1
S B A 2 1
Switch 16 A
Over current
protection 16 A Total operating current
be less than 16 A Pull box
Fresh Master
Switch 16 A
Over current
protection 16 A
Fresh Master
Terminal block for outdoor
transmission cable
TM2
(Fresh Master) TM2
(after Fresh Master)
Terminal block for the
Fresh Master transmis-
sion cable
TB3 MA Remote controller
(PAR-21MAA)
ME Remote
controller
(PAR-F27MEA)
- 24 to 30 V DC between M1 and M2
Longest wiring length (L1+L2+L4 or L1+L3): less than 200 m
Longest wiring length (L2+L3+L4): less than 500 m
Length between the Fresh Master and the Remote controller ( ):
within 10 m
Notes:
*1 Putthetransmissioncableearthviatheoutdoorunit'searth
terminal to the ground.
*2 If the Remote controller cable exceeds 10 m, use a 1.25 mm2
to 2.0 mm2cableovertheexceededportion,andaddthat
exceeded portion to within 200 m.
*3 The BC controller is required only for simultaneous cooling
and heating series R2.
[Constraints on transmission cable]
G
IJJJ
KK
KK
J J
LK
H
*1
*3
L1
L2 L4
L3
*2
GOutdoor unit
HEarth
IBC controller
JFresh Master
KRemote controller
L Non-polarized 2-wire

16
ENGLISH
8.6. Connectingelectricalconnections
1. Remove the 4 screws to remove the control box cover.
2. Install a PG connection or the like, then connect the power supply
cable to the TM1 terminal block.
PE
N
L
Caution:
- Wire the power supply so that no tension is imparted. Other-
wisedisconnection,heatingorremayresult.
Screw Controller box cover
3. Connect the transmission line to the TM2 terminal block as shown
in the diagram.
11
10
9
8
7
1
2
A
B
S
12
4. When connecting the humidistat input, remove the short-circuit
piece from the TM3 terminal block as shown in the diagram, then
install a PG connector and connect to the TM3 terminal block.
* The humidistat is the sensor designed specically for the control
of moisture environment.
The suitable model in this stage :
Uncharged a-contact turns on when atmospheric moisture
content becomes less than your preset minimum allowable
percentage.
Terminal block (TM1)
Terminal block for power supply cable (for TM1)
Grounding wire
PG connection or the like
Power supply cable
Name plate
Terminal block for TM2
M-NET trans-
mission
cable
Shield
wire
Terminal block (TM3)
Transmission cable
to terminal block
for Fresh Master
outdoor and BC
controller
Humidistat *
Uncharged
a-contact
240 V AC more
than 10 mA
Short-circuit
piece
Terminal block (TM2)
Humidistat cable
PVC insulated PVC
jacketed control cable 0.75
mm2. Recommended type
H03VV-F, H05VV-F.
PAR-21MAA
(Remote
controller)
PG connection
or the like
Terminal block for TM3
Humidistat
Malfunction
monitor
output
Operation
monitor
output
Remote
Controller

17
ENGLISH
9. Feature settings
Caution:
* Always turn off the main power supply.
*Removethecontrolboxcover.
9.1. Address setting
(Determining the address depends on the own-site system. Please
see to technical references, etc.)
Remove the control box cover.
Turn the address setting switch on the board using a Phillips screw-
driver.
- The left side (SW12) shows the second digit and the right side
(SW11) shows the rst digit.
- The switch is set to 00 when factory shipped.
- Set the address between 1 and 50.
9.2. When using an R2 series external
unit, setting for the branch No. is
also required.
Turn the branch controller No. setting switch (SW14) on the board
using a Phillips screwdriver.
- Set the refrigerant pipe of the external unit and the connected
branch controller to the same number.
- The switch is set to 0 when factory shipped.
SW12 SW11 SW14
Second digit First digit Branch No.
9.3. Feature select switches
(SW1, SW3, SW2)
* When shipped from the factory
Items concerning humidifying is for GUF-50, 100RDH4 only.
SW1
OFF ON
Fan test operation switch (test operation when ON)
Filter maintenance display (displayed when ON)
Filter maintenance time setting switch
Do not touch
Damper motor test operation (test operation when
ON)
Solenoid valve test operation for humidier water supply
(test operation when ON) Do not touch GUF-50, 100RD4
Auto-recovery during power failure (active when on)
Power supply ON/OFF (test operation when on)
SW3 ----GUF-50, 100RDH4
OFF ON Synchronous air-conditioning switch (async when
ON)
Humidier mode (OFF: humidier; ON: heat save)
Heater operation during synchronous operation/
stop temperature switch
Exhaust fan operation when supply fan is stopped
(exhaust fan also stopped when ON)
Do not touch
Automatic humidier control (active when ON)
Do not touch
SW3 ----GUF-50, 100RD4
OFF ON Synchronous air-conditioning switch (async when
ON)
Do not touch
Exhaust fan operation when supply fan is stopped
(exhaust fan also stopped when ON)
Do not touch
Room temperature detected at main unit is decreased
by 4°C when heating. (OFF: active; ON: inactive)
Room-temperature sensor location (OFF: main
unit; ON: remote control)
Do not touch
SW2
OFF ON
Do not touch
Fan speed control method select switch
7: OFF, 8: ON x to High speed.
Both ONs x to Low speed.
Do not touch
Notes:
* Theswitchesareverticalforexplanationpurposes.
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10

18
ENGLISH
9.3.1. Filter maintenance time setting
Set the lter maintenance display ON/OFF and time according to
use.
2
3
4
2
3
4
3
4
3
4
When the accumulated operation time reaches the set time, indica-
tion for lter cleaning is notied to the Remote controller.
After cleaning, press the lter button twice to reset the accumulated
operation time.
9.3.2. Power-failureauto-recoveryselect
(independent of Fresh Master)
Set the Fresh Master operation condition when power failure is
recovered.
9
9
9.3.3. Power ON feature
Set whether to operate the Fresh Master or not when the main
power is turned ON.
10
10
9.3.4. Indoor unit and synchronous setting
Setting to synchronize with the indoor unit.
1
1
Maintenance time
Filter maintenance display ON
Filter maintenance display OFF*
1,500 hours
3,000 hours*
4,500 hours
Unrestricted
Switch
SW1
OFF ON
Mode
Fresh Master stopped when power failure is
recovered.*
Fresh Master recovers to the prior state
when power failure is recovered.
Switch
SW1
OFF ON
Mode
Inactive: operates according to the SW1-9
setting*
Active: operation starts with power ON
Switch
SW1
OFF ON
9.3.5. Humidiermodeselect(GUF-50,
100RDH4 only)
Setting the humidier mode.
2
2
Used when operating only the Fresh Master and the temperature
during heating becomes too hot. The heating capability can be
saved lower temperature than normal.
9.3.6. Heat operation stop temperature setting
(GUF-50, 100RDH4 only)
Stopping the heating operation when synchronous with the indoor
unit.
It becomes invalid when SW3-1 is ON.
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
9.3.7. Exhaustfanoperationsetting
Setting the exhaust fan operation, although the supply fan will stop
when defrosting during heating or when withdrawing the refrigerant.
6
6
9.3.8. Automatichumidiercontrolsetting
(GUF-50, 100RDH4 only)
Although the permeable-lm humidier is supplied with water for
humidifying when heating, there is a feature to automatically stop the
water supply depending on the outside temperature.
8
8
Mode
Synchronizing with the indoor unit*
Asynchronous with the indoor unit. The
Remote controller operation only.
Switch
SW3
OFF ON
Mode
Standard humidier mode*
Heat save humidier mode (see below)
Switch
SW3
OFF ON
Switch
SW3
OFF ON
Set outside
temperature
6°C
7°C
8°C
9°C
OFF ON
Set outside
temperature
10°C*
12°C
14°C
16°C
Mode
Exhaust fan in operation even when the
supply fan is stopped*
Exhaust fan is stopped wen the supply fan
is stopped
Switch
SW3
OFF ON
Mode
Automatic humidier control prohibited*
Water is supplied to the permeable-lm
humidier constantly when the heater is in
operation.
Automatic humidier control permitted
When the outside temperature is below
12°C during heating operation, supply water
to the permeable-lm humidier.
Switch
SW3
OFF ON