Mitsubishi Electric PUMY-SP112VKM.TH Operating manual

TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT
HFC
utilized
R410A
November 2020
<Outdoor unit>
[Model Name]
PARTS CATALOG (OCB668)
Salt proof model
[Service Ref.]
CONTENTS
TECHNICAL CHANGES································· 2
1. SAFETY PRECAUTION....................................3
2. OVERVIEW OF UNITS......................................6
3. SPECIFICATIONS........................................... 10
4. DATA................................................................12
5. OUTLINES AND DIMENSIONS...................... 27
6. WIRING DIAGRAM......................................... 28
7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION..... 30
8. TROUBLESHOOTING.................................... 46
9. ELECTRICAL WIRING...................................122
10. REFRIGERANT PIPING TASKS....................128
11. DISASSEMBLY PROCEDURE.......................135
12. REMOTE CONTROLLER.............................. 142
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
No. OCH668
REVISED EDITION-G
OCH668 REVISED
EDITION-F is void.
PUMY-SP112VKM.TH PUMY-SP112VKMR1.TH PUMY-SP112VKMR2.TH
PUMY-SP112VKM-ETR2.TH PUMY-SP112VKM-ERR2.TH
PUMY-SP125VKM.TH PUMY-SP125VKMR1.TH PUMY-SP125VKMR2.TH
PUMY-SP125VKM-ETR2.TH PUMY-SP125VKM-ERR2.TH
PUMY-SP140VKM.TH PUMY-SP140VKMR1.TH PUMY-SP140VKMR2.TH
PUMY-SP140VKM-ETR2.TH PUMY-SP140VKM-ERR2.TH
PUMY-SP112YKM.TH PUMY-SP112YKMR1.TH PUMY-SP112YKMR2.TH
PUMY-SP112YKM-ETR2.TH PUMY-SP112YKM-ERR2.TH
PUMY-SP125YKM.TH PUMY-SP125YKMR1.TH PUMY-SP125YKMR2.TH
PUMY-SP125YKM-ETR2.TH PUMY-SP125YKM-ERR2.TH
PUMY-SP140YKM.TH PUMY-SP140YKMR1.TH PUMY-SP140YKMR2.TH
PUMY-SP140YKM-ETR2.TH PUMY-SP140YKM-ERR2.TH
PUMY-SP112VKM.TH-BS PUMY-SP112VKMR1.TH-BS PUMY-SP112VKM-BSR2.TH
PUMY-SP112VKM-ET-BSR2.TH PUMY-SP112VKM-ER-BSR2.TH
PUMY-SP125VKM.TH-BS PUMY-SP125VKMR1.TH-BS PUMY-SP125VKM-BSR2.TH
PUMY-SP125VKM-ET-BSR2.TH PUMY-SP125VKM-ER-BSR2.TH
PUMY-SP140VKM.TH-BS PUMY-SP140VKMR1.TH-BS PUMY-SP140VKM-BSR2.TH
PUMY-SP140VKM-ET-BSR2.TH PUMY-SP140VKM-ER-BSR2.TH
PUMY-SP112YKM.TH-BS PUMY-SP112YKMR1.TH-BS PUMY-SP112YKM-BSR2.TH
PUMY-SP112YKM-ET-BSR2.TH PUMY-SP112YKM-ER-BSR2.TH
PUMY-SP125YKM.TH-BS PUMY-SP125YKMR1.TH-BS PUMY-SP125YKM-BSR2.TH
PUMY-SP125YKM-ET-BSR2.TH PUMY-SP125YKM-ER-BSR2.TH
PUMY-SP140YKM.TH-BS PUMY-SP140YKMR1.TH-BS PUMY-SP140YKM-BSR2.TH
PUMY-SP140YKM-ET-BSR2.TH PUMY-SP140YKM-ER-BSR2.TH
PUMY-SP112VKM
PUMY-SP112VKM-ET/ER
PUMY-SP125VKM
PUMY-SP125VKM-ET/ER
PUMY-SP140VKM
PUMY-SP140VKM-ET/ER
PUMY-SP112YKM
PUMY-SP112YKM-ET/ER
PUMY-SP125YKM
PUMY-SP125YKM-ET/ER
PUMY-SP140YKM
PUMY-SP140YKM-ET/ER
PUMY-SP112VKM-BS
PUMY-SP112VKM-ET/ER-BS
PUMY-SP125VKM-BS
PUMY-SP125VKM-ET/ER-BS
PUMY-SP140VKM-BS
PUMY-SP140VKM-ET/ER-BS
PUMY-SP112YKM-BS
PUMY-SP112YKM-ET/ER-BS
PUMY-SP125YKM-BS
PUMY-SP125YKM-ET/ER-BS
PUMY-SP140YKM-BS
PUMY-SP140YKM-ET/ER-BS
Revision:
• PUMY-SP112VKM-ER(-BS)R2.TH,
PUMY-SP125VKM-ER(-BS)R2.TH,
PUMY-SP140VKM-ER(-BS)R2.TH,
PUMY-SP112YKM-ER(-BS)R2.TH,
PUMY-SP125YKM-ER(-BS)R2.TH, and
PUMY-SP140YKM-ER(-BS)R2.TH have
been added in REVISED EDITION-G.

2
OCH668G
TECHNICAL CHANGES
PUMY-SP112VKMR1.TH PUMY-SP112VKMR2.TH
PUMY-SP125VKMR1.TH PUMY-SP125VKMR2.TH
PUMY-SP140VKMR1.TH PUMY-SP140VKMR2.TH
PUMY-SP112YKMR1.TH PUMY-SP112YKMR2.TH
PUMY-SP125YKMR1.TH PUMY-SP125YKMR2.TH
PUMY-SP140YKMR1.TH PUMY-SP140YKMR2.TH
PUMY-SP112VKMR1.TH-BS PUMY-SP112VKM-BSR2.TH
PUMY-SP125VKMR1.TH-BS PUMY-SP125VKM-BSR2.TH
PUMY-SP140VKMR1.TH-BS PUMY-SP140VKM-BSR2.TH
PUMY-SP112YKMR1.TH-BS PUMY-SP112YKM-BSR2.TH
PUMY-SP125YKMR1.TH-BS PUMY-SP125YKM-BSR2.TH
PUMY-SP140YKMR1.TH-BS PUMY-SP140YKM-BSR2.TH
• Some connectable indoor units have been added.
PUMY-SP112VKM.TH PUMY-SP112VKMR1.TH
PUMY-SP125VKM.TH PUMY-SP125VKMR1.TH
PUMY-SP140VKM.TH PUMY-SP140VKMR1.TH
PUMY-SP112YKM.TH PUMY-SP112YKMR1.TH
PUMY-SP125YKM.TH PUMY-SP125YKMR1.TH
PUMY-SP140YKM.TH PUMY-SP140YKMR1.TH
PUMY-SP112VKM.TH-BS PUMY-SP112VKMR1.TH-BS
PUMY-SP125VKM.TH-BS PUMY-SP125VKMR1.TH-BS
PUMY-SP140VKM.TH-BS PUMY-SP140VKMR1.TH-BS
PUMY-SP112YKM.TH-BS PUMY-SP112YKMR1.TH-BS
PUMY-SP125YKM.TH-BS PUMY-SP125YKMR1.TH-BS
PUMY-SP140YKM.TH-BS PUMY-SP140YKMR1.TH-BS
• Some connectable indoor units have been added.
Service ref. have been changed as follows.

3
OCH668G
Cautions for units utilizing refrigerant R410A
1-1. CAUTIONS RELATED TO NEW REFRIGERANT
1SAFETY PRECAUTION
Use new refrigerant pipes.
Avoid using thin pipes.
Use a vacuum pump with a reverse ow check
valve.
Vacuum pump oil may ow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the e󰀩ciency will be lowered.
Use the specied refrigerant only.
Never use any refrigerant other than that specied.
Doing so may cause a burst, an explosion, or re when
the unit is being used, serviced, or disposed of.
Correct refrigerant is specied in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a ame, poisonous gases will be released.
Use the following tools specically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A
refrigerant.
Tools for R410A
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Electronic refrigerant
charging scale
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles,
etc.,
which are hazard to refrigerant cycle.
In addition, use pipes with specied thickness.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
The refrigerant oil applied to are and ange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil, etc.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the e󰀩ciency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Precautions during the repair service
• Do not perform the work involving the electric parts
with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
•
Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs
to be done without turning o󰀨 the power, exercise great
caution not to touch the live parts.
Preparation before the repair service
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn
o󰀨 the power-supply breaker.
• Discharge the condenser before the work involving the
electric parts.

4
OCH668G
Unit
Electronic weighing scale
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the
performance of the unit.
(1) Avoid installing the unit in a location where it will be exposed directly to seawater or sea breeze.
(2) If the cover panel may become covered with salt, be sure to install the unit in a location where the salt will be washed away
by rainwater. (If a sunshade is installed, rainwater may not clean the panel.)
(3) To ensure that water does not collect in the base of the outdoor unit, make sure that the base is level, not at angle. Water
collecting in the base of the outdoor unit could cause rust.
(4) If the unit is installed in a coastal area, clean the unit with water regularly to remove any salt build-up.
(5) If the unit is damaged during installation or maintenance, be sure to repair it.
(6) Be sure to check the condition of the unit regularly.
(7) Be sure to install the unit in a location with good drainage.
1-2. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09MPa·G or over.
3Electronic weighing scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —

5
OCH668G
Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is the
same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the work-
ing pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
1 Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness shown
below. (Never use pipes of 0.7 mm or below.)
2 Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that, R410A
is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrigerants.
Therefore, to enhance airtightness and strength, flare cutting dimension of copper pipe for R410A has been specified sepa-
rately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also has partly
been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for
R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.
Use torque wrench corresponding to each dimension.
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8
0.8
0.8
1.0
—
0.8
0.8
0.8
1.0
1.0
Nominal
dimensions (in)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm)
R410A R22
Dimension A
Dimension B
Flare cutting dimensions Flare nut dimensions
Nominal
dimensions (in)
Outside
diameter (mm)
Dimension A
(
+0
-0.4
)
(mm) Nominal
dimensions (in)
Outside
diameter (mm)
Dimension B (mm)
R410A R22 R410A R22
1/4 6.35 9.1 9.0 1/4 6.35 17.0 17.0
3/8 9.52 13.2 13.0 3/8 9.52 22.0 22.0
1/2 12.70 16.6 16.2 1/2 12.70 26.0 24.0
5/8 15.88 19.7 19.4 5/8 15.88 29.0 27.0
3/4 19.05 — 23.3 3/4 19.05 — 36.0
3 Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials Use R410A tools Can R22 tools be used? Can R407C tools be used?
Gauge manifold Air purge, refrigerant charge
and operation check
Tool exclusive for R410A × ×
Charge hose Tool exclusive for R410A × ×
Gas leak detector Gas leak check Tool for HFC refrigerant ×○
Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A × ×
Refrigerant cylinder Refrigerant charge Tool exclusive for R410A × ×
Applied oil Apply to ared section Ester oil, ether oil and alkylbenzene
oil (minimum amount)
×Ester oil, ether oil: ○
Alkylbenzene oil: minimum amount
Safety charger Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Tool exclusive for R410A × ×
Charge valve Prevent gas from blowing out
when detaching charge hose
Tool exclusive for R410A × ×
Vacuum pump Vacuum drying and air purge Tools for other refrigerants
can be used if equipped with
adapter for reverse ow check
( Usable if equipped
with adapter for
reverse flow)
( Usable if equipped with
adapter for reverse flow)
Flare tool Flaring work of piping
Tools for other refrigerants can be
used by adjusting aring dimension
(Usable by
adjusting aring
dimension)
( Usable by adjusting
aring dimension)
Bender Bend the pipes
Tools for other refrigerants can be used
○ ○
Pipe cutter Cut the pipes Tools for other refrigerants can be used
○ ○
Welder and nitrogen gas
cylinder
Weld the pipes Tools for other refrigerants can be used
○ ○
Refrigerant charging scale Refrigerant charge Tools for other refrigerants can be used
○ ○
Vacuum gauge or thermistor
vacuum gauge and vacuum
valve
Check the degree of vacuum. (Vacuum
valve prevents back ow of oil and refri-
gerant to thermistor vacuum gauge)
Tools for other refrigerants can be used
○ ○
Charging cylinder Refrigerant charge Tool exclusive for R410A ×-
×: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
○: Tools for other refrigerants can be used.