Mitsubishi Electric City Multi PFD-P250 500VM-E How to use

AIR CONDITIONERS CITY MULTI
Service Handbook
Issued in Mar. 2006 HWE05250
Printed in Japan
New publication effective Mar. 2006.
Specifications subject to change without notice.
Service Handbook PFD-P250, P500VM-E / PUHY-P250, P500YGM-A
PFD-P250, P500VM-E
PUHY-P250, P500YGM-A
Models PFD-P250, P500VM-E
PUHY-P250, P500YGM-A
Service Handbook
TENTATIVE

- 1 -
I Indoor Unit Components
[1] Indoor Unit Components and Internal Structure ................................................................ 3
[2] Control Box of the Indoor Unit ........................................................................................... 7
[3] Indoor Unit Circuit Board ................................................................................................... 8

- 2 -

- 3 -
[ I Indoor Unit Components ]
I Indoor Unit Components
[1] Indoor Unit Components and Internal Structure
1. PFD-P250VM-E models
(1) Front view of a indoor unit
(2) Rear view of a indoor unit
Lock key X 2
Display lamp
Panel for refrigerant circuit maintenance
Panel for air filter maintenance
Operation panel (remote controller)
Panel for controller/fan related parts maintenance

- 4 -
[ I Indoor Unit Components ]
(3) Front view of internal structure
(4) Rear view of internal structure
Heat exchanger X 2 (front / back)
Sub drain pan
Suction temperature thermistor
(on the right side of heat exchanger)
Linear expansion valve (LEV)
Drain pan
Drain hose
Pulley X 2
Pipes (gas/liquid)
Fan motor
V belt
Controller
Air filter
Fan casing
(on the back of controller)
Discharge temperature thermistor
(on the left side of fan casing)
Drain hose
Pipes (ga /liquid)
Fan casing

- 5 -
[ I Indoor Unit Components ]
2. PFD-P500VM-E models
(1) Front view of a indoor unit
(2) Rear view of a indoor unit
Lock key X 4
Panel for controller maintenance
Display lamp
Operation panel (remote controller)
Panel for fan related parts maintenance
Panel for refrigerant circuit maintenance
Panel for air filter maintenance

- 6 -
[ I Indoor Unit Components ]
(3) Front view of internal structure
(4) Rear view of a refrigerant circuit
Remote controller Float switch X 2
Drain pan
Display lamp
Normal/inspection switching switch
Heat exchanger X 2 (front:No. 1; back:No. 2)
Sub drain pan
Suction temperature thermistor
(on the right side of heat exchanger)
Linear expansion valve (LEV)
Drain pan
Operation panel
Bearing Drain hose
Pulley X 2
Pipes (gas/liquid)
Fan motor
V belt
<Location of drain pan overflow detection float switch>
Controller
Air filter
Fan casing
Discharge temperature thermistor
(on the left side of fan casing)
Bearing
Pipes (gas/liquid)

- 7 -
[ I Indoor Unit Components ]
[2] Control Box of the Indoor Unit
1. PFD-P250VM-E models
2. PFD-P500VM-E models






Circuit board for external I/O
Terminal block for transmission line (upper)
Terminal block for MA remote controller (lower)
Power supply terminal bed
Surge absorber board
Motor wiring
Surge breaker (51F)
Fuse (F1)
Electro magnetic
contactor (52F)
Relay(X11,Z1,Z3)
Controller board
Transformer
Circuit board for external I/O
Terminal block for transmission line on No.2 side (upper)
Terminal block for MA remote controller (lower)
Power supply terminal bed
Terminal block for transmission
line on No.1 side
Motor wiring
Surge breaker (51F)
Electro magnetic
contactor (52F)
Relay(X11,X12,Z1,Z2,Z3)
Controller board
Transformer
Adapter board for LEV
Surge absorber board
Fuse (F1)

- 8 -
[ I Indoor Unit Components ]
[3] Indoor Unit Circuit Board
1. PFD-P250,P500VM-E models
(1) Indoor Control Board
(2) External Input/Output Circuit Board
CND
Power supply
input
(AC 200V)
F901
Fuse
CN2M
Indoor unit
transmission
line
CN3T
Power supply input
(from transformer)
CNT
Power supply output
(to transformer)
CN90
Fan output
CNP
Drain pump
output
CN60
LEV output
SW1,2,3,4
Dip switch
CN24
Control signal
output
CN51
Switch input
LED1
LED2
CN31
Float switch input
CN32
Switch input
SWC
Switching between
discharge/suction control
Thermistor input
CN20
CN21
CN29
CN22
CN33
Lamp output
CN3A
Remote controller connection
CN53
Indoor control board (No.1)
To CN51
CN54
Indoor control board (No.2)
To CN51
TB22 (Relay contact output)
No.1 operation status
No.1 error status
No.2 operation status
No.2 error status
TB23 (Input with voltage)
ON/OFF
TB21 (Input no voltage)
ON/OFF

- 9 -
II Refrigerant Circuit
[1] Principal Parts and Functions .......................................................................................... 11

- 10 -

- 11 -
[ II Refrigerant Circuit ]
II Refrigeran t Circuit
[1] Principal Parts and Functions
2. Indoor unit
(1) PFD-P250,500VM-E
Part
name
Symbols
(functions) Notes Usage Specifications Check method
Linear ex-
pansion
valve
(LEV)
LEV 1.Adjusts superheat at the heat
exchanger outlet of the indoor
unit during cooling
2. Adjusts subcool at the heat
exchanger outlet of the indoor
unit during cooling
DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses
Continuity check
with a tester
Continuity be-
tween white, red,
and orange.
Continuity be-
tween yellow,
brown, and blue.
Ther-
mistor
TH21
(Suction
air tem-
perature)
Indoor unit control (Thermo)
0°C : 15kohm
10°C :9.7kohm
20°C :6.4kohm
25°C :5.3kohm
30°C :4.3kohm
40°C :3.1kohm
Resistance check
TH22
(Pipe tem-
perature)
Indoor unit control (Freeze pre-
vention, Pre-heating stand-by)
TH23
(Gas pipe
tempera-
ture)
LEV control during cooling oper-
ation (Superheat detection)
TH24
(Dis-
charge air
tempera-
ture)
Controls indoor unit discharge
(thermostat)
Float
Switch
33P1
33P2
Detects drain pan water level Contact Resistance:
Under 250 mohm
B contact type
Continuity check
with a tester
Motor MF Sends air PFD-P250VM-E
AC400V Type E 4P
Output 3.7kW
Resistance check
PFD-P500VM-E
AC400V Type B 4P
Output 5.5kW
Resistance check
Yellow
M
BlueBrown
White
Red
Orange
R = 15k
0
R = 3460
R = 15
0/80
t3460
273 t
1
273
1
exp
V
UW
0.45 10%/2 phases
V
UW
1.72 10%/2 phases

- 12 -
[ II Refrigerant Circuit ]

- 13 -
III Control
[1] Functions and Factory Settings of the Dipswitches ......................................................... 15
[2] Controlling the Outdoor Unit ............................................................................................ 20
[3] Operation Flow Chart....................................................................................................... 28
[4] Controlling the Indoor Unit ............................................................................................... 29

- 14 -

- 15 -
[ III Control ]
III Control
[1] Functions and Factory Settings of the Dipswitches
1. Outdoor unit
(1) Main board
Switch Function
Function according to switch setting Switch setting timing
OFF ON OFF ON
SWU 1-2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on
SW1 1-10 For self-diagnosis/op-
eration monitoring
Refer to the LED monitor display on
the outdoor unit board. Anytime after power on
SW2
1- - - -
2Deletion of connec-
tion information Normal control Deletion Before power on
3Deletion of error his-
tory SW
Storage of IC/OC
error history
Deletion of IC/OC
error history
Anytime after power on (When
switched from OFF to ON)
4Refrigerant amount
adjustment Normal control
Refrigerant
amount adjust-
ment mode
Anytime after power on (Will be dis-
abled 2 hours after compressor start
up except during initial start up mode)
5- - - -
6- - - -
7 Forced defrost Normal control Forced defrost
starts
Anytime after
power on (When
switched from
OFF to ON)
10 minutes after
compressor start-
up
8 Defrost timer setting 50 minutes 90 minutes Anytime after power on (When
switched from OFF to ON)
9- - - -
10 - - - -
SW3
1Test run mode: en-
abled/disabled SW3-2 disabled SW3-2 enabled Anytime after power on
2Test run mode: ON/
OFF Stops all ICs Sends a test-run
signal to all IC
After power on and when SW3-1 is
on.
3Defrost start tempera-
ture
-10°C
(-8 °C for 500
model unit)
-7°C
(-5 °C for 500
model unit)
Anytime after power on
4Defrost end tempera-
ture
10°C
( 7°C for 500
model unit)
15°C
(12°C for 500
model unit)
Anytime after power on (except dur-
ing defrost operation)
5- - - -
6 Pump down operation Normal control Pump down oper-
ation
After power on and while compressor
is stopped
7
Target condensing
temperature on the
heating mode Tcm
49°C 53°C Anytime after power on
8- - - -
9- - - -
10 - - - -
Note: All are set to OFF at factory shipment.

- 16 -
[ III Control ]
SW4
1- - - -
2- - - -
3- - - -
4
Reset of the integrat-
ed operation time Val-
id/Invalid
(comp 1 side)
Disabled Enabled Anytime after power on
5
Reset of the integrat-
ed operation time Val-
id/Invalid
(comp 2 side)
Disabled Enabled Anytime after power on
6- - - -
7- - - -
8- - - -
9- - - -
10
Dehumidification pri-
ority control Valid/In-
valid
Enabled Disabled Anytime after power on
SW5
1- - - -
2
Rotation time under
two-refrigerant circuit
system
240hr 120hr Anytime after power on
3- - - -
4Switching thermostat
control function Valid Invalid Anytime after power on
5- - - -
6- - - -
7- - - -
8- - - -
9- - - -
10 - - - -
SWU
3Reset of the integrat-
ed operation time
Resetting the integrated operation
time according to the settings of SW4-
4 and 4-5
After power on. (when switching from
0 or 1 to 2)
Switch Function
Function according to switch setting Switch setting timing
OFF ON OFF ON
Note: All are set to OFF at factory shipment.

- 17 -
[ III Control ]
(2) Compressor INV board
Note1 Except for SW2-1, all are set to OFF at factory shipment. Unless otherwise specified, set the switch to OFF
where indicated by "-," which may be set to a certain setting for a reason.
Note2 Leave SW1-1 to OFF during normal operation. If it is set to ON, errors cannot be detected and the unit may be
damaged.
(3) FAN INV board
Note: Except for SW2-1, all are set to OFF at factory shipment. Unless otherwise specified, set the switch to OFF where
indicated by "-," which may be set to a certain setting for a reason.
Switch Function
Function according to switch
setting Switch setting timing
OFF ON OFF ON
SW1 1 Enabling/disabling the following error
detection functions;
ACCT or DCCT sensor circuit error
(530X Detail No. 115, 116)
ACCT or DCCT sensor failure
(530X Detail No.117,118)
IPM open/Disconnected CNCT2
(530X Detail No. 119)
Detection of erroneous wiring
(530X Detail No.120)
Error detec-
tion enabled
Error detec-
tion disabled
Anytime after power on
2 - - - - -
3 - - - - -
4 - - - - -
SW2 1 Inverter address 0 1 Always leave it to ON
2 - - - - -
3 - - - - -
4 - - - - -
Switch Function
Function according to switch
setting Switch setting timing
OFF ON OFF ON
SW2 1 Inverter address 0 5 Always leave it to ON
2 - - - - -
3 - - - - -
4 - - - - -

- 18 -
[ III Control ]
2. Function of the switch (Indoor unit)
(1) Dipswitches
[SW1,3,7]
[SW2,SW3-2,SW4]
[SW5]
Switch Function
Function according to switch setting
OFF ON
Switch setting timing
OFF ON Notes
SW1
SW3
SW7
1
2
3
4
5
6
7
8
9
10
1
2
3
4
1
2
3
4
5
6
7
9
10
8
Clogged filter detection
Filter check reminder
time setting
Remote display option
External input
Operation switching
Capacity code
100h
Fan output
2500h
Thermo-ON signal
Available
Level
External input MA remote controller
Pulse
Not available Available
Not available Available
Not available Available
Refer to the combination with SW2
Not available
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LEV setting conversion
function
Reset of the integrated
operation time
Valid/Invalid (fan belt)
Reset of the integrated
operation time
Valid/Invalid (fan motor)
--
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While the unit is stopped
(Remote controller OFF)
Note 1. Setting timing for DIPSW 1 and 3 is during unit stoppage (remote controller OFF). It is not necessary to reset the settings by power-off.
Note 2. Settings in the shaded areas are factory settings.
Model System Capacity code SW3-2
123456
P250 50 OFF ON
OFF
P500
Two-refrigerant circuit connection
One-refrigerant circuit connection
One-refrigerant circuit connection 100
50
ON
OFF
SW2 SW4
12345
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
*
* The setting is changed at site under two-refrigerant circuit connection
<Capacity code and function setting>
If the capacity code or the function is set wrongly when the circuit board is replaced, reset the power of both the indoor unit and the outdoor unit.
Function Switch setting timing
During unit stoppage (remote controller OFF)
(when switching from OFF to ON)
Reset of the integrated
operation time
Resetting the integrated operation time
according to the setting of SW7-1 and 7-2
Operation by switch setting

- 19 -
[ III Control ]
[SW8]
(2) Slide switches
3. Function of the switch <Remote controller>
MA remote controller (PAR-20MAA)
The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote
controller main/sub setting or other function settings. Normally, do not change the settings of switches other than the SW1
(main/sub switching switch). (All the switches are set to "ON" at factory setting.)
Anytime
after power on
1
Normal control
Compulsory thermo OFF
23
Compulsory thermo OFF setting during test run
(used in the grouped indoor units connected to
different outdoor units)
ON
OFF
ON
OFF
Function Operation by switch setting Switch setting timing
Switch Function Operation by switch setting
Switch setting timing
SWC 1~2
Switching between
suction/discharge temperature
control
Anytime
after power on
Option
Standard
Option
Standard
Input setting
Suction temperature control
Discharge temperature control
*
* The settings for the two circuit boards must be equivalent to switch between suction/discharge temperature control under
two-refrigerant circuit system.
Remote controllerSwitching switch
1
ON
234
Switch
2
1
Function
Remote controller
main/sub setting
At power on of the
remote controller
Normal
startup
Timer mode
startup
3Cooling/heating display
set by automatic setting Displayed Not displayed
4Suction temperature display
(discharge temperature display) Displayed Not displayed
Operation by switch settings Switch setting timing
ON OFF
Main Sub
Before power on
Before power on
Before power on
Before power on
When two remote controllers are connected
to one group, set either of the remote
controllers to "Sub".
To resume the operation with timer mode
after the power is restored when the
schedule timer is connected, set to
"Timer mode startup".
When the automatic mode is set and the
"Cooling"/"Heating" display is not necessary,
set to "Not displayed".
When the suction temperature (discharge
temperature) display is not necessary,
set to "Not displayed".