Mitsubishi Electric PMFY Series Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Indoor unit
[Model names] [Service Ref.]
No. OC307
REVISED EDITION-E
INDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES.....................2
2. SAFETY PRECAUTION .....................3
3. PART NAMES AND FUNCTIONS......5
4. SPECIFICATIONS ............................12
5. OUTLINES AND DIMENSIONS .......16
6. WIRING DIAGRAM...........................17
7. REFRIGERANT SYSTEM DIAGRAM.... 21
8. TROUBLE SHOOTING.....................22
9. DISASSEMBLY PROCEDURE.........32
10. RoHS PARTS LIST...........................36
Ceiling Cassettes
Series PMFY
R410A
December 2012
Note:
•This manual describes
only service data of the
indoor units.
•RoHS compliant products
have <G> mark on the
spec name plate.
•For servicing RoHS com-
pliant products, refer to
the RoHS Parts List.
Revision:
•
PMFY-P20/25/32/40VBM-ER4
have been added in
REVISED EDITION-E.
•Some descriptions have
been modified.
•Please void OC307
REVISED EDITION-D.
PMFY-P20VBM-E
PMFY-P25VBM-E
PMFY-P32VBM-E
PMFY-P40VBM-E
PMFY-P20VBM-E
PMFY-P20VBM-E#2
PMFY-P20VBM-ER4
PMFY-P25VBM-E
PMFY-P25VBM-E#2
PMFY-P25VBM-ER4
PMFY-P32VBM-E
PMFY-P32VBM-E#2
PMFY-P32VBM-ER4
PMFY-P40VBM-E
PMFY-P40VBM-E#2
PMFY-P40VBM-ER4
PMFY-P20VBM-E1
PMFY-P20VBM-ER3
PMFY-P25VBM-E1
PMFY-P25VBM-ER3
PMFY-P32VBM-E1
PMFY-P32VBM-ER3
PMFY-P40VBM-E1
PMFY-P40VBM-ER3

2
1TECHNICAL CHANGES
PMFY-P20VBM-E PMFY-P20VBM-E1
PMFY-P25VBM-E PMFY-P25VBM-E1
PMFY-P32VBM-E PMFY-P32VBM-E1
PMFY-P40VBM-E PMFY-P40VBM-E1
1. FAN MOTOR (MF) has been changed.
2. CONTROLLER BOARD (I.B) has been changed.
PMFY-P20VBM-E1PMFY-P20VBM-E#2
PMFY-P25VBM-E1PMFY-P25VBM-E#2
PMFY-P32VBM-E1PMFY-P32VBM-E#2
PMFY-P40VBM-E1PMFY-P40VBM-E#2
1. CONTROLLER BOARD (I.B) has been changed.
2. PANEL has been changed.
PMP-40BM →PMP-40BMW
(White : 0.98Y 8.99/0.63) (Pure white : 6.4Y 8.9/0.4)
3. FAN MOTOR (MF) has been changed.
4. THERMISTOR (TH22, TH23) have been changed.
PMFY-P20VBM-E#2 PMFY-P20VBM-ER3
PMFY-P25VBM-E#2 PMFY-P25VBM-ER3
PMFY-P32VBM-E#2 PMFY-P32VBM-ER3
PMFY-P40VBM-E#2 PMFY-P40VBM-ER3
1. DRAIN PIPE has been changed.
2. JOINT SOCKET (FOR DRAIN PIPE) has been added.
PMFY-P20VBM-ER3 PMFY-P20VBM-ER4
PMFY-P25VBM-ER3 PMFY-P25VBM-ER4
PMFY-P32VBM-ER3 PMFY-P32VBM-ER4
PMFY-P40VBM-ER3 PMFY-P40VBM-ER4
1. INDOOR CONTROLLER BOARD has been changed. (S/W version up)
OC307E

3
Cautions for units utilizing refrigerant R410A
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency 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.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
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 specified thickness.
Store the piping indoors, and both ends of the
piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified 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.
Use the specified refrigerant only.
2SAFETY PRECAUTION
OC307E

4
[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) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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 scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adapter 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 —
OC307E

55
3PART NAMES AND FUNCTIONS
3-1. Indoor Unit
Guide vane
Air flow can be changed to horizontal
by moving the Guide vane to the left or right.
Air intake
Returns air from room.
Filters
Remove dust and pollutants
from return air.
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Horizontal Air Outlet
OC307E