Mitsubishi Electric PURY-P72 How to use
--~~--~
Tab 1
IN
THIS SECTION
.Air Conditioners
I-IARRIS
~IR
SY-STE~S,
INC.
Heat;inB
&..-Air
Condit;ioninB
Inst;allat;ion
&,,-Service
Changes
for the
Better
•
41
4&
Safety Precautions
-Before installing the unit, thoroughly read the following safety precautions.
-Observe these safety precautions for your safety.
LtWARNING
This symbol is intended to alert the userto the presence
of
important instructions that must be followed to avoid
the risk
of
serious injury
or
death.
L!l
CAUTION
This symbol is intended to alert the userto the presence
of
important instructions that must
be
followed to avoid
the risk of serious injury or damage to the unit.
-After reading this manual, give it to the userto retain for future reference.
-Keepthis manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these
services.
When the user changes, make sure that the new user receives this manual.
I.&.
WARNING
Ask
your
dealer
or
aqualified technician
to
install the
unit.
Improperinstallation
by
the user may result
in
water leak-
age, electric shock, smoke, and/or fire.
Properly
install
the
unit
on
a
surface
that
can
with-
stand
the
weight
of
the
unit.
Unit installed on
an
unstable surface mayfall
and
cause in-
jury.
Only
use
specified cables. Securely connect each
ca·
ble
so
that
the
tenninals
do
not
carry
the
weight
of
the
cable.
Improperly connected or fixed cables may produce heat
and start afire.
Take
appropriate
safety measures against
strong
winds
and
earthquakes
to
prevent
the
unit
from
falling.
Ifthe unit is not installed properly, the unit may
fall
and
cause serious injury to the person or damage to the unit.
Do
not
make any
modifications
or
alterations
to
the
unit.
Consult
your
dealer
for
repair.
Improperrepairmay result
in
waterleakage, electric shock,
smoke, and/or fire.
Do
not
touch
the heat exchanger
fins.
The fins are sharp and dangerous.
In
the
event
of
arefrigerant leak,
thoroughly
ventilate
the
room.
Ifrefrigerant
gas
leaks and comes
in
contact with
an
open
flame, poisonous gases will be produced.
When installing the All-Fresh
type
units, take
it
into
consideration
that the
outside
air
may
be
discharged
directly
into
the room
when
the
thenno
is
turned
off.
Direct exposure to outdoor air may have an adverse effect
on health. It may also result
in
food spoilage.
Properly
install the
unit
according
to
the
instructions
in
the
installation manual.
Improper installation may result
in
water leakage, electric
shock, smoke, and/or fire.
Have
all
electrical
work
perfonned
by
an authorized
electrician
according
to
the
local
regulations
and
in-
structions
in
this
manual, and adedicated
circuit
must
be used.
Insufficient capacity ofthe powersupply circuit
or
improper
installation may result
in
malfunctions
of
the unit, electric
shock, smoke, and/or fire.
HWE0803A GB
IAWARNING
Securely
attach
the
terminal
block
cover
(panel)
to
the
unit.
Ifthe terminal block cover (panel) is not installed properly,
dust andlor water may infiltrate and pose arisk ofelectric
shock, smoke, andlor fire.
Only
usethe
type
of
refrigerant
that
is
indicated
on the
unit
when
installing
or
reinstalling
the
unit.
Infiltration ofany other type ofrefrigerant orair into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
When
installing
the
unit
in asmall
room,
exercise cau-
tion
and take measures against leaked
refrigerant
reaching
the
limiting
concentration.
Consult your dealer with any questions regarding limiting
concentrations and for precautionary measures before in-
stalling the unit. Leaked refrigerant gas exceeding the lim-
iting concentration causes oxygen deficiency.
Consult
your
dealer
or
a
specialist
when
moving
or
re-
installing
the
unit.
Improper installation may result
in
water leakage, electric
shock, andlor fire.
HWE0803A
ii
After
completing
the
service
work,
check
for
a
gas
leak.
Ifleaked refrigerant
is
exposed to aheat source, such as a
fan heater, stove, or electric grill, poisonous gases may
be
produced.
Do
not
try
to
defeat
the
safety
features
of
the
unit.
Forced operation
of
the pressure switch
or
the temperature
switch by defeating the safety features
of
these devices, or
the use
of
accessories other than the ones that are recom-
mended by MITSUBISHI may result
in
smoke, fire, and/or
explosion.
Only
use accessories
recommended
by
MITSUBISHI.
Ask aqualified technician to install the unit. Improper instal-
lation by the user may result in water leakage, electric
shock, smoke, and/or fire.
Control
box
houses
high-voltage
parts.
When opening orclosing the front panel
of
the control box,
do not let it come into contact with any
of
the internal com-
ponents. Before inspecting the inside
of
the control box,
tum offthe power, keep the unit
off
for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on
INV Board has dropped to DC20V
or
less. (It takes about
10minutes to discharge electricityafterthe powersupply is
turned off.)
GB
..
-
-----
Precautions for handling units for use with R410A
I
Lt:,.
CAUTION
Do
not
use
the
existing
refrigerant
piping.
-A large amount
of
chlorine thatis contained
in
the residual
refrigerant and refrigerator oil
in
the existing piping may
cause the refrigerator oil
in
the new unit to deteriorate.
tR410A is ahigh-pressure refrigerant and
can
cause the
existing pipes to burst.
Use
refrigerant
pipes made
of
phosphorus
deoxidized
copper.
Keep
the
inner
and
outer
surfaces
of
the
pipes
clean
and
free
of
such
contaminants
as
sulfur,
oxides,
dust,
dirt,
shaving
particles, oil,
and
water.
These types
of
contaminants inside the refrigerant pipes
may cause the refrigerant oil to deteriorate.
Store
the
pipes
to
be
installed
indoors,
and keep
both
ends
of
the
pipes
sealed
until
immediately
before
braz-
ing. (Keep
elbows
and
other
joints
wrapped
in
plastic.)
Infiltration of dust, dirt, orwater into the refrigerant system
may cause the refrigerating machine oil to deteriorate or
cause the unit to malfunction.
Use a
small
amount
of
ester
oil,
ether
all,
or
alkylben-
zene
to
coat
flares
and flanges.
Infiltration
of
alarge amount
of
mineral oil may cause the re-
frigerating machine oil
to
deteriorate.
Charge
liquid
refrigerant
(as
opposed
to
gaseous
re-
frigerant)
into
the
system.
Ifgaseous refrigerant
is
charged into the system, the com-
position of the refrigerant
in
the cylinder will change and
may result
in
performance loss.
HWE0803A iii
Use avacuum
pump
with a
reverse-flow
check valve.
Ifavacuum pump that is not equipped with areverse-flow
check valve
is
used, the vacuum pump oil mayflow into the
refrigerant cycle and cause the refrigerating machine oil to
deteriorate.
Prepare
tools
for
exclusive
use
with
R410A. Do
not
use
the
following
tools
If
they
have
been
used
with
the
con-
ventional
refrigerant (gauge
manifold,
charging
hose,
gas
leakdetector,reverse-flow
check
valve,refrigerant
charge base,
vacuum
gauge, and
refrigerant
recovery
equipment.).
-If
the refrigerant or the refrigerating machine oil left
on
these tools are mixed
in
with R410A, it may cause the re-
frigerating machine oil
to
deteriorate.
-Infiltration ofwater may cause the refrigerating machine
oil to deteriorate.
-Gas leak detectors for conventional refrigerants will not
detect an R410A leak because R410A is free ofchlorine.
Do
not
use acharging cylinder.
If acharging cylinder
is
used, the composition of the refrig-
erant will change, and the unit may experience power loss.
Exercise
special care when
handling
the
tools
for
use
with
R410A.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.
Only
use
refrigerant R410A.
The use
of
other types ofrefrigerant that contain chlorine
(Le. R22) may cause the refrigerating machine oil to deteri-
orate.
GB
_
..
_---------------
Before installing the unit
I
Lt.
WARNING
Do
not
install
the
unit
where agas leak
may
occur.
Ifgaseous refrigerant leaks and piles up around the unit, it
may
be
ignited.
Do
not
use
the
unit
to
keep
food
items, animals, plants,
artifacts,
or
for
other
special
purposes.
The unit
is
not designed to preserve food products.
Do
not
use
the
unit
in
an
unusual
environment.
•
Do
notinstall the unit where alarge amount ofoil orsteam
is present orwhere acidic or alkaline solutions or chemical
sprays are used frequently. Doing so may lead
to
are-
markable drop
in
performance, electric shock, malfunc-
tions, smoke, and/or fire.
•The presence
of
organic solvents or corrosive gas
(Le.
ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.
HWE0803A
iv
When
installing
the
unit
in
a
hospital,
take
appropriate
measures
to
reduce
noise
interference.
High-frequency medical equipment may interfere with the
normal operation
of
the air conditioner or vice versa.
Do
not
install
the
unit
on
or
over
things
that
cannot
get
wet.
When the humidity level exceeds 80% or if the drainage
system
is
clogged, the indoor unit may drip water. Drain wa-
teris also discharged from the outdoor unit. Install acentral-
ized drainage system
if
necessary.
GB
Before installing the unit (moving and reinstalling the unit) and performing
electrical work
[Lt.CAUTION
Properly
ground
the
unit.
Do
notconnectthe grounding wire to agaspipe, waterpipe,
lightning rod, or grounding wire from atelephone pole. Im-
proper grounding may result
in
electric shock, smoke, fire,
and/or malfunction due to noise interference.
Do
not
put
tension
on
the
power
supply
wires.
If
tension
is
put
on
the wires, they may break and result
in
excessive heat, smoke, and/or fire.
Install an earth leakage breaker
to
avoid the
risk
of
electric
shock.
Failure
to
install
an
earth leakage breaker may result in
electric shock, smoke, and/orfire.
Use
the
kind
of
power
supply
wires
that
are specified
in
the
installation
manual.
The use
of
wrong kind of power supply wires may result
in
current leak, electric shock, and/or fire.
Use
breakers
and
fuses
(current breaker, remote
switch
<switch
+Type-B fuse>,
moulded
case
circuit
breaker)
with
the
proper
current capacity.
The use
of
wrong capacity fuses, steel wires, or copper
wires may result
in
malfunctions, smoke, and/orfire.
Do
not
spray
water
on
the
air
conditioner
or
Immerse
the
air
conditioner
in
water.
Otherwise, electric shock and/or fire may result.
When
handling
units, always wear protective gloves
to
protect
your
hands
from
metal parts and high.tempera-
ture
parts.
HWE0803A v
Periodically check the installation base
for
damage.
Ifthe unit is left
on
adamaged platform, it may fall and
cause injury.
Properly install
the
drain
pipes
according
to
the
in-
structions
in the installation manual. Keep
them
insu-
lated
to
avoid
dew
condensation.
Improper plumbing work may result
in
water leakage and
damage to the furnishings.
Exercise caution when
transporting
products.
-Products weighing more than 20
kg
should not be carried
alone.
-
Do
notcarrythe productbythe
PP
bandsthat are used
on
some products.
•Do nottouch the heat exchangerfins. They are sharp
and
dangerous.
-When lifting the unit with acrane, secure all four comers
to prevent the unit from falling.
Properly
dispose
of
the
packing
materials.
·Nails and wood pieces
in
the package may pose arisk
of
injury.
·Plastic bags may pose arisk
of
choking hazard to chil-
dren. Tear plastic bags into pieces before disposing of
them.
GB
1-
Before the test
run
!6CAUTION
Turn on the
unit
at
least 12 hours before the
test
run.
Keep the unitturned
on
throughout the season. Ifthe unit
is
turned off
in
the middle
of
aseason, it
may
result in malfunc-
tions.
To
avoid
the
risk
of
electric
shock
or
malfunction
of
the /
unit,
do
not
operate switches with
wet
hands.
Do
not
touch
the refrigerantpipes
with
bare hands
dur-
ing
and
immediately
after
operation.
During orimmediately after operation, certain parts
of
the
unit such
as
pipes and compressor may be either very cold
or hot, depending
on
the state ofthe refrigerant
in
the unit
at the time. To reduce the risk offrost bites and bums, do
not touch these parts with bare hands.
Do
not
operate the
unit
without
panels and
safety
guards.
Rotating, high-temperature,
or
high-voltage parts on the unit
pose arisk of burns and/or electric shock.
Do
not
turn
off
the
power
immediately
after
stopping
the
operation.
Keep the unit
on
for at leastfive minutes before turning off
the power
to
prevent water leakage
or
malfunction.
Do
not
operate the
unit
without
the
air
filter.
Dust particles
may
build up in the system and cause mal-
functions.
HWEOB03A
vi
GB
CONTENTS
IRead Before Servicing
[1] Read Before Servicing 3
[2] Necessary Tools and Materials 4
[3] Piping Materials 5
[4] Storage of Piping 7
[5] Pipe Processing 7
[6] Brazing 8
[7] Air Tightness Test 9
[8] Vacuum Drying (Evacuation) 10
[9] Refrigerant Charging 12
[10] Remedies to be taken
in
case
of
aRefrigerant Leak 12
[11] Characteristics
of
the Conventional and the New Refrigerants 13
[12] Notes on Refrigerating Machine Oil 14
IT
Restrictions
[1] System configuration 17
[2] Types and Maximum allowable Length
of
Cables 18
[3] Switch Settings and Address Settings 19
[4] Sample System Connection 25
[5] An Example
of
aSystem to which an MA Remote Controller is connected 26
[6] An Example of aSystem to which an M-NET Remote Controller is connected 38
[7]
An Example
of
aSystem to which both MA Remote Controller and M-NET Remote
Controller are connected 40
[8] Restrictions on Pipe Length 43
ill
Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit.. 57
[2] Control Box ofthe Outdoor Unit... 60
[3] Outdoor Unit Circuit Board 64
[4] BC Controller Components 74
[5] Control Box of the BC Controller 77
[6] BC Controller Circuit Board 78
IV
Remote Controller
[1] Functions and Specifications
of
MA
and ME Remote Controllers 83
[2] Group Settings and Interlock Settings via the ME Remote Controller 84
[3] Interlock Settings via the
MA
Remote Controller 88
[4] Using the built-in Temperature Sensor on the Remote Controller 89
VElectrical Wiring Diagram
[1] Electrical Wiring Diagram
of
the Outdoor Unit 93
[2] Electrical Wiring Diagram
of
the BC Controller 96
[3] Electrical Wiring Diagram
of
Transmission Booster 105
VI
Refrigerant Circuit
[1] Refrigerant Circuit Diagram 109
[2] Principal Parts and Functions 116
VII
Control
[1] Functions and Factory Settings
of
the Dipswitches 125
[2] Controlling the Outdoor Unit 132
[3] Controlling BC Controller 145
[4] Operation Flow Chart 146
VITI
Test
Run
Mode
[1] Items to
be
checked before aTest Run 155
[2] Test Run Method 156
[3] Operating Characteristic and Refrigerant Amount.. 157
[4] Adjusting the Refrigerant Amount... 157
[5] Refrigerant Amount Adjust Mode 160
[6] The following symptoms are normal. 162
[7]
Standard Operation Data (Reference Data) 163
HWEOB03A GB •
CONTENTS
IX
Troubleshooting
[1] Error Code Lists 179
[2] Responding to Error Display on the Remote Controller 182
[3] Investigation
of
Transmission Wave Shape/Noise
270
[4] Troubleshooting Principal Parts
273
[5] Refrigerant Leak 314
[6J
Compressor
Replacement
Jnstructions
316
[7] Servicing the BC controller 327
[8J
Troubleshooting Using the Outdoor Unit LED Error Display 330
XLED Monitor Display
on
the Outdoor Unit Board
[1J
How
to Read the
LED
on the Service Monitor 333
HWE0803A GB
I
I
IRead Before Servicing
[1] Read Before Servicing 3
[2] Necessary Tools
and
Materials 4
[3] Piping Materials 5
[4] Storage of Piping 7
[5] Pipe Processing 7
[6] Brazing 8
[7] Air Tightness Test 9
[8] Vacuum Drying (Evacuation) 10
[9] Refrigerant Charging 12
[10] Remedies
to
be taken
in
case of aRefrigerant Leak
12
[11] Characteristics
of
the Conventional and the New Refrigerants
13
[12] Notes
on
Refrigerating Machine Oil 14
HWE0803A - 1 - GB
- 2 -
[I
Read Before Servicing]
[1] Read Before Servicing
1. Check the type
of
refrigerant used
in
the system
to
be serviced.
Refrigerant Type
Multi air conditioner for building application CITY MULTI
R2
THMU-A, YHMU-A series
R41
OA
2. Check the
symptoms
exhibited
by
the
unit
to
be
serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3.
Thoroughly
read the safety precautions at the beginning
of
this
manual.
4. Preparing necessary tools: Prepare a
set
of
tools
to
be
used
exclusively
with each type
of
refrigerant.
Refer
to
"Necessary Tools and Materials" for information
on
the use oftools.(page
4)
5.
Verification
of
the connecting pipes: Verify the type
of
refrigerant used
for
the unit
to
be moved
or
replaced.
tUse refrigerant pipes made of phosphorus deoxidized copper. Keep the inner
and
outer surfaces ofthe pipes clean
and
free
of
such contaminants as sulfur, oxides, dust, dirt. shaving particles, oil, and water.
tThese types of contaminants inside the refrigerant pipes may cause the refrigerant
oil
to
deteriorate.
6.
If
there
is
aleak
of
gaseous refrigerant and the remaining refrigerant is exposed to an open flame, apoisonous gas
hydrofluoric
acid may form. Keep workplace well ventilated.
Lh
CAUTION
tlnstall new pipes immediately after removing old ones to keep moisture out ofthe refrigerant circuit.
tThe use
of
refrigerant that contains chloride, such as
R22,
will cause
the
refrigerating machine oil to deteriorate.
HWEQ8Q3A
- 3 -
GB
[I
Read Before Servicing]
[21
Necessary Tools and Materials
Prepare the following tools and materials necessary for installing and servicing the unit.
Tools
for
use with R410A
(Adaptability
of
tools
that
are
for
use
with
R22
or
R407C)
1.
To
be
used
exclusively
with
R410A (not
to
be used
if
used
with
R22
or
R407C)
Tools/Materials Use Notes
Gauge Manifold Evacuation and refrigerant charging Higherthan 5.09MPa[73Bpsi] on the
high-pressure side
Charging Hose Evacuation and refrigerant charging The hose diameter is larger than the
conventional model.
Refrigerant Recovery Cylinder Refrigerant recovery
Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The
cylinder
is
pink.
Charging Port
on
the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger
than that of the current port.
Flare Nut Connection
of
the unit with the pipes Use Type-2 Flare nuts.
2.
Tools
and materials
that
may
be
used
with
R410A
with
some
restrictions
TOOls/Materials Use Notes
Gas Leak Detector Gas leak detection The ones foruse with HFC refrigerant
may be used.
Vacuum Pump Vacuum drying May be used
if
acheck valve adapter
is
attached.
Flare Tool Flare processing Flare processing dimensions for the
piping
in
the system using the new re-
frigerant differ from those
of
R22. Re-
fer to I
[3]
Piping Materials.
Refrigerant Recovery Equipment Refrigerant recovery May be used
if
compatible with
R410A.
3.
Tools
and
materials
that
are
used
with
R22
or
R407C
that
may
also
be
used
with
R410A
Tools/Materials Use Notes
Vacuum Pump with aCheck Valve Vacuum drying
Bender Bending pipes
Torque Wrench Tightening flare nuts Only the flare processing dimensions
for pipes that have adiameter
of
012.70 (1/2") and 015.BB (5/B") have
been changed.
Pipe Cutter Cutting pipes
Welder and Nitrogen Cylinder Welding pipes
Refrigerant Charging Meter Refrigerant charging
Vacuum Gauge Vacuum level check
4.
Tools
and materials
that
must
not
be used
with
R410A
Tools/Materials Use Notes
Charging Cylinder Refrigerant charging Prohibited to use
Tools for R410A must
be
handled with special care
to
keep moisture and dust from infiltrating the cycle.
HWEOB03A
-4-
GB
[I
Read Before
Servicing]
[3] Piping Materials
(
Do
not
use
the
existing
piping!
)
1. Copper pipe materials
O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily
be
bentwith hands.
1/2H-material (Drawn) Hard copperpipes (straight pipes). They are strongerthan the O-material (Annealed)
at the same radial thickness.
-
The
distinction between G-materials (Annealed)and 1/2H-materials(Drawn)ismade based on the strengthofthe pipesthem-
selves.
2.
Types
of
copper pipes
Maximum working pressure Refrigerant type
3.45 MPa [500psi] R22, R407C etc.
4.30 MPa [624psi] R410A etc.
3. Piping materials/Radial thickness
Use refrigerant pipes
made
of
phosphorus deoxidized copper.
The operation pressure
of
the units that use R410A is higherthan that
of
the units that use R22.
Use pipes that have at leastthe radial thickness specified in the chart below.
(Pipes with aradial thickness
of
0.7 mm [28mil] or less may not be used.)
Pipe size (mmOn.]) Radial thickness (mm [mil]) Type
06.35 [1/4"] 0.8t [32t]
09.52 [3/8"] 0.8t
[321)
G-material (Annealed)
1il12.7
[1/2"] 0.8t [32t]
1il15.88 [5/8"] 1.0t
[401)
019.05 [3/4"] 1.0t
[401)
1il22.2
[7/8"]
1.01(40t)
1il25.4
[1
"]
1.01
[40t]
028.58 [1-1/8"] 1.0t
[401)
1/2H-material,
H-material (Drawn)
1il31.75 [1-1/4"] 1.1t [44t)
1il34.93 [1-3/8"] 1.2t [48t)
1il41.28 [1-5/8"] 1.4t [56t)
-The pipes
in
the system that uses the refrigerant currently on the market are made with O-material (Annealed), even
if
the
pipe diameteris less than 1il19.05 (3/4"). For asystem that uses R410A, use pipes that are made with 1/2H-material (Drawn)
unless the pipe diameter is at least 019.05 (3/4") and the radial thickness is at least 1.2t.
-The
figures
in
the radial thickness column are based on the Japanese standards and provided only as areference. Use pipes
that meet the local standards.
HWEOB03A
-
5-
GB
------------
-~~-
[I
Read Before Servicing J
4. Thickness and refrigerant type indicated on the piping materials
Ask the pipe manufacturer for the symbols indicated on the piping material for
new
refrigerant.
5.
Flare processing (O-material (Annealed) and OL-material only)
The flare processing dimensions for the pipes that are used in the R410A system are largerthan those
in
the R22 system.
Flare processing dimensions (mm[in.J)
Pipe size (mm[in.J) Adimension (mm)
R410A
R22,R407C
06.35
[1/4"J
9.1
9.0
09.52
[3/8"J
13.2 13.0
012.7
[1/2"J
16.6 16.2
015.88
[5/8"J
19.7 19.4
019.05
[3/4"J
24.0 23.3
«~
c
.2
.~
------
Cl
(019.05 pipes should have aradial thickness
of
1.2 tand be made
of
annealed materials.)
If
aclutCh-type flare tool is used to flare the pipes in the system using R410A, the length
of
the pipes must be between 1.0
and 1.5 mm. For margin adjustment, acopper pipe gauge is necessary.
6. Flare nut
The flare nut type has been changed to increase the strength. The size
of
some
of
the flare nuts have also been changed.
Flare nut dimensions (mm[in.J)
Pipe size (mm[in.J) Bdimension (mm)
R410A
R22,R407C
06.35
[1/4"J
17.0 17.0
09.52
[3/8"J
22.0 22.0
/1112.7
[112"]
26.0 24.0
/1115.88
[5/8'1 29.0 27.0
019.05
[3/4"J
36.0 36.0
g@
Dimension B
The figures in the radial thickness column are based on the Japanese standards and provided only as areference. Use pipes
that meet the local standards.
HWE0803A
- 6 - GB
1--
[I
Read Before Servicing]
[4] Storage of Piping
1.
Storage location
Store the pipes to be used indoors. (Warehouse at site or owner's warehouse)
If
they are left outdoors, dust, dirt,
or
moisture may infiltrate and contaminate the pipe.
2.
Sealing the pipe ends
Both ends
of
the pipes should be sealed until just before brazing.
Keep elbow pipes and T-joints in plastic bags.
The new refrigerator oil
is
10 times as hygroscopic as the conventional refrigerating machine oil (such as Suniso) and, if not
handled with care, could easily introduce moisture into the system. Keep moisture out
of
the pipes, for it will cause the oil to
deteriorate and cause acompressor failure.
[5] Pipe Processing
Use asmall amount
of
ester oil, ether oil,
or
alkylbenzene to coat flares and flanges.
NoteI
·Use
aminimum amount
of
oil.
·Use
only ester oil, ether oil, and alkylbenzene.
HWEOB03A -
7-
GB
-------
[I
Read Before Servicing J
[6] Brazing
No changes have been made
in
the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide
scale, water, and dust) out
of
the refrigerant system.
Example: Inside the brazed connection
Use
of
oxidized solderfor brazing Use
of
non-oxidized solder for brazing
1. Items
to
be
strictly
observed
-Do not conduct refrigerant piping work outdoors
if
raining.
-Use non-oxidized solder.
-Use abrazing material (BCuP-3) that requires no flux when brazing between copper pipes or between acopper pipe and
copper coupling.
-If
installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
-The new refrigerating machine oil is 10 times as hygroscopic as the conventional oil and is more likely to cause unit failure
if
water infiltrates into the system.
-Flux generally contains chloride. Residual flux
in
the refrigerant circuit will cause slUdge to form.
3.
Notes
Do
not use commercially available antioxidants because they may cause the pipes to corrode
or
refrigerating machine oil to
deteriorate.
HWEOB03A
-
8-
GB
[I
Read Before Servicing]
[7] Air Tightness Test
No changes have been made in the detection method. Note that arefrigerant leak detector for R22
will
not detect an R410Aleak.
Halide torch R22 leakage detector
1. Items to be strictly observed
tPressurize the equipmentwith nitrogen up tothe design pressure (4.15MPa[601psij), and then judgethe equipment's airtight-
ness, taking temperature variations into account.
tRefrigerant R410A must be charged in its liquid state (vs. gaseous state).
2.
Reasons
tOxygen,
if
used for an air tightness test, poses arisk
of
explosion. (Only use nitrogen to check airtightness.)
tRefrigerant R410A mustbe charged in its liquid state. Ifgaseous refrigerant in the cylinder is drawn outfirst, the composition
of
the remaining refrigerant
in
the cylinder
will
change and become unsuitable for use.
3.
Notes
Procure aleak detector that is specifically designed to detect an HFC leak. Aleak detectorfor R22 will not detect
an
HFC(R410A) leak.
HWEOB03A -
9-
GB
[I
Read Before Servicing]
[8] Vacuum Drying (Evacuation)
(Phot01) 15010H (Photo2) 14010
Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge
1.
Vacuum
pump
with
areverse-flow
check
valve
(Photo1)
To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use avacuum
pump with areverse-flow check valve.
Areverse-flow check valve may also be added to the vacuum pump currently in use.
2.
Standard
of
vacuum
degree
(Photo
2)
Use avacuum pump thatattains 0.5Torr(65Pa)
or
lowerdegree ofvacuum after 5minutes ofoperation, and connect itdirectly
to the vacuum gauge. Use apump well-maintained with an appropriate lubricant. Apoorly maintained vacuum pump
may
not
be able to attain the desired degree
of
vacuum.
3.
Required
precision
of
vacuum
gauge
Use avacuum gauge that registers avacuum degree
of
5Torr(650Pa) and measures at intervals
of
Horr(130Pa). (A recom-
mended vacuum gauge is shown
in
Photo2.)
Do not use acommonly used gauge manifold because it cannot register avacuum degree
of
5Torr(650Pa).
4.
Evacuation
time
-After the degree ofvacuum has reached 5Torr(650Pa), evacuate for an additional 1hour. (A thorough vacuum drying re-
moves moisture
in
the pipes.)
-Verify that the vacuum degree has not risen by more than
Horr(130Pa)
1hour after evacuation. Arise by less than
Horr(130Pa)
is
acceptable.
-If
the vacuum is lost by more than
Horr(130Pa),
conduct evacuation, following the instructions in section
6.
Special vacuum
drying.
5.
Procedures
for
stopping
vacuum
pump
To prevent the reverse flow ofvacuum pump oil, open the relief valve
on
the vacuum pump side, or draw in air by loosening
the charge hose, and then stop the operation.
The same procedures should be followed when stopping avacuum pump with areverse-flow check valve.
6.
Special
vacuum
drying
-When 5Torr(650Pa) or lowerdegree of vacuum cannot be attained after 3hours
of
evacuation, it is likely that water has pen-
etrated the system
or
that there is aleak.
-Ifwater infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to
O.5kgf/cm2G(O.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree
of
vac-
uum below 5Torr(650Pa)
is
attained
or
until the pressure stops rising.
-Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)
HWE0803A -
10-
GB
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