Mitsubishi Electric PAC-YU25HT - Manual

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WT05383X01

GB

Air-Conditioners For Building Application

External Heater Adapter

PAC-YU25HT

Installation Manual

This manual describes installation of the External Heater Adapter that connects to CITY MULTI air conditioner R410A series indoor unit. This
products is the special wiring parts to drive an electric heater with the air conditioner. Please refer to the technical manual for details. For your
safety, be sure to read firstly “

” described below thoroughly and then install the PAC-YU25HT.

1

Safety Precaution

●

The following two symbols are used to denote dangers that may be caused by incorrect use.

WARNING

This symbol denotes what could lead to serious injury or death if your misuse the PAC-YU25HT.

CAUTION

This symbol denotes what could lead to a personal injury or property damage if you misuse the PAC-YU25HT.

●

After reading this instruction manual, keep it in a place where the end user can find it anytime he or she wants to it. When someone moves,
repairs or uses the PAC-YU25HT, make sure that this manual is forwarded to the final user.

CAUTION

WARNING

Ask your dealer or technical representative to install the unit.

Any deficiency caused by your own installation may result in an electric
shock or fire.

Ensure that installation work is done correctly following this instruc-
tion manual

Any deficiency caused by installation may result in an electric shock or fire.

Firmly connect the wiring using the specified cables.
Carefully check that the cables do not exert any forces on the termi-
nals.

Improper wiring connections may produce heat and possibly a fire.

Never modify or repair the PAC-YU25HT.

Any deficiency caused by your modification or repair may result in an elec-
tric shock or fire.
Consult with your dealer about repair.

All electrical work must be performed by a licenced technician, ac-
cording to local regulations and the instructions given in this manual.

Any lack of electric circuit or any deficiency caused by installation may
result in an electric shock or fire.

Do not move and re-install the PAC-YU25HT yourself.

Any deficiency caused by installation may result in an electric shock or fire.
Ask your distributor or special vendor for moving and installation.

Do not install in any place where acidic or alkaline solution or special
spray are often used.

Doing so may cause an electric shock or malfunction.

Do not install in any steamy place such a bathroom or kitchen.

Avoid any place where moisture is condensed into dew.
Doing so may cause an electric shock or malfunction.

Do not wash with water.

Doing so may cause an electric shock or malfunction.

Do not install in any place at a temperature of more than 40˚C (104˚F)
or less than 0˚C (32˚F) or exposed to direct sunlight.

Do not install in any place exposed to flammable gas leakage.

Flammable gases accumulated around the body of PAC-YU25HT may
cause an explosion.

Do not use in any special environment.

Using in any place exposed to oil (inculuding machine oil), steam and sul-
furic gas may deteriorate the performance significantly or give damage to
the component parts.

Wire so that it does not receive any tension.

Tension may cause wire breakage, heating or fire.

Stop the operation if any malfunction occurs.

If malfunction occurs (burning smell, etc.) stop the operation and turn off
the power supply. Contact your dealer or technical representative. If the
controller continues to operate after a malfunction occurs, this may cause
damage, electric shock or fire.

Do not turn on the main power until installation has been completed.

Doing so may result in electric shock or fire.

Leave sufficient space between heater and indoor unit to allow for air
movement to prevent the indoor unit from overheating.

If they are installed too closely and the indoor unit temperature exceeds
40 ˚C, malfunctions or fire may result.

Keep the heater clean to keep the indoor unit from sucking in accu-
mulated dust on the heater.

Dust particles that enter the indoor unit may cause fire.

When air conditioner and heater are configured to perform an inter-
locked operation, do not use any other type of cables except this ex-
ternal heater adapter (PAC-YU25HT).

The use of any other type of cables may result in malfunctions or fire.

Do not build a heater into the indoor unit.

Doing so may result in fire.

2

Parts list

Check that the following parts are included in the package.

(1) External output cable (with a yellow connector) ............................. 2 in total

Two types of cables with different connectors are included.

(2) Panel heater connector ................................................................... 3 in total

1

1

1

1

1

White : 1

2

2

2

2

2

Green: 2 (2 types)

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Connection to the Indoor Unit

Use the cables that fit the connectors on the indoor unit control board.

The items listed in this parts list cannot be used with the following models.

• PMFY-BM
• PMFY-AM

(1) External output cable (with a yellow connector)

This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.

Connect the cable to

CN24 on the indoor unit control board.

(2) Panel heater connector (with a green connector)

This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit control board specification,
connect the cable either to CN4Y or CN22 as appropriate.

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Locally Procured Wiring

A basic connection method is shown below.

(1) PEFY-P-NMSU-E and other models

For relay X use the specifications given below Operation coil

Rated voltage : 12VDC
Power consumption : 0.9W or less

* Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.

The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft)
To extend this length, use sheathed 2-core cable.

Control cable type : CVV, CVS, CPEV or equivalent.
Cable size : 0.5 mm

2

~ 1.25 mm

2

(16 to 22 AWG)

Don’t extend the cable more than 10 meters (32ft)

Recommended circuit

5

Wiring Restrictions

Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).
Longer than 10 meters (32ft) could cause improper operation.
Use a transit relay when extending wiring such as remote wiring.

1 Safety Precaution

CN24

CN22

X

X

Remote control board

Relay circuit

Adapter

Indoor unit
control board

Outdoor unit
control board

Electric Heater

power source

Electric Heater
or panel
heater

Red

1

White

2

• PUHY, PURY-P-

TGMU type Dip
switch SW5-2
“ON”

• PUHY, PURY-P-

YHMU type Dip
switch SW5-10
“ON”

• PUMY series Dip

switch SW4-4
“ON”

Preparations in the field

Maximum cable length
is 10 m (32ft)

Y

e

llow

White

R410A Series

Wiring diagram

1-phase power
supply

208V, 230V/60Hz

Control board

FS1, 2 ----- Thermal fuse

H1, H2 ----- Heater

26H --------- Overheat protection

thermostat

88H --------- Electromagnetic contactor

White

1

Dip switch SW3-2 “ON”

(applicable only when a panel
heater is connected)

CN24

CN22

X

X

Remote control board

Relay circuit

Adapter

Indoor unit
control board

Outdoor unit
control board

Electric Heater

power source

Red

1

White

2

• PUHY, PURY-P-

TGMU type Dip
switch SW5-2
“ON”

• PUHY, PURY-P-

YHMU type Dip
switch SW5-10
“ON”

• PUMY series Dip

switch SW4-4
“ON”

Preparations in the field

Maximum cable length
is 10 m (32ft)

Y

ellow

Green

White

1

Dip switch SW3-2 “ON”

(applicable only when a panel
heater is connected)

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H E A D O F F I C E :

T O K Y O B L D G . , 2 - 7 - 3 , M A R U N O U C H I , C H I Y O D A - K U , T O K Y O 1 0 0 - 8 3 1 0 , J A PA N

Authorized representative in EU:

MITSUBISHI ELECTRIC EUROPE B.V.

HARMAN HOUSE, 1 GEORGE STREET, UXBRIDGE, MIDDLESEX UB8 1QQ, U.K.

(2) PEFY-P-NMHU-E, PDFY-P-NMU-E and other models

2

CN4Y

Electric Heater
or panel
heater

FS1

FS2
FS1

FS2

R

S

R

S

CN24

H2

88H

H1

88H

26H

88H

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Dip S/W setting for outdoor units and indoor units

(1) Heater control

*Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the DIP S/W on the
outdoor and indoor units as shown in Table 1. See “ ” for details. The table below shows Heater Control
patterns #A and B.

Outdoor unit
setting

Condition of outdoor unit

Duct unitPE/PD/PF-NR (NL)

(PEFY-P06, 08, 12, 15, 18, 24NMSU-E)

N O N d u c t u n i t
(PL/PK/PC)

a

b

c

d

DIP S/W OFF
In the case of:
<TGMU>
S/W5-2 OFF
<THMU>
S/W5-10 OFF
<PUMY>
S/W4-4 OFF

DIP S/W ON
In the case of:
<TGMU>
S/W5-2 ON
<THMU>
S/W5-10 ON
<PUMY>
S/W4-4 ON

N/A

DIP S/W3-4
OFF (Indoor unit)

Heater control #A
( d e f r o s t / e r r o r
:Heater OFF)

DIP S/W3-4
ON (Indoor unit)

Heater control #A
( d e f r o s t / e r r o r
:Heater ON)

Heater control #A
( d e f r o s t / e r r o r
:Heater ON)

Heater OFF

Heater OFF

DIP S/W3-4
OFF (Indoor unit)

Heater control #A
( d e f r o s t / e r r o r
:Heater OFF)

DIP S/W3-4
ON (Indoor unit)

Heater control #B
( d e f r o s t / e r r o r
:Heater ON)

Heater control #B
( d e f r o s t / e r r o r
:Heater ON)

Defrost drive

H/P drive

H/P stop

P a r a m e t e r s a / b / c / d a r e s e t b y
maintenance tool.

Condition of O/U

Outdoor temp.

H/P stop

H/P drive

Defrost drive

Normal drive

Table.2

Heater control #A

Heater OFF Inlet air temp. set temp.Heater
ON Inlet air temp. < set temp.-4F

Heater control #B

Heater OFF Inlet air temp. set temp.Heater
ON Inlet air temp. < set temp.-1.8F

Note:

<For heater>
Initial setting: 4

˚

C (can be set to a value between 1.8 and 9

˚

F)

Note:

Set temp.

Set temp.-1.8F

Set temp.-4F

ON
OFF

Inlet air temp.

Heater output

Set temp.

Set temp.-1.8F

ON
OFF

Inlet air temp.

Heater output

(2) Fan control

*By using the PAC-YU25HT (optional parts), fan speed can be controlled.

Normal drive

Duct unit PE/PD/PF-NR (NL) (PEFY-P06, 08, 12, 15, 18, 24NMSU-E)

CN4Y for FAN control (YU25)

Not use

Use

DIP S/W3-4 (Indoor unit)

OFF

OFF

ON

ON

Fan in defrost

Stop (Heater OFF)

L / LL / Set *

Stop (Heater OFF)
Stop (Heater ON)

*Depend on SW1-7/1-8 (Heater ON)

SW3-1

OFF

ON

*1 Fan speed

Very low

Low

Remote controller setting

Stop

OFF

OFF
OFF

OFF

ON

ON

OFF

ON

OFF

ON

OFF

ON
ON

SW1-7

SW1-8

STOP (*2 Remote controller setting)

NON duct unit (PL/PK/PC)

CN22 for FAN control (YU25)
N/A

DIP S/W (Indoor unit)

N/A

Fan in defrost

Stop (Heater ON)

Reference (not applicable to the ducted models)

CN4Y for FAN control
(PAC-YU25HT)

<Image>

Table.1

(1) On the ducted model units (except the Fresh air intake type), turning on the heater with the fan setting set to OFF requires that

the DIP S/W and connectors on the indoor units*1 are set on site (in case of PEFY-P06, 08, 12, 15, 18, 24NMSU-E).

*1: DIP SW3-4, CN24, and CN4Y
(2) On the Fresh air intake type units, the heater cannot be turned on with the fan setting set to OFF.
(3) Non-ducted models do not require the settings described in “(1) Heater control” above.
(4) Back-up heating will not be performed when the heater turns on while demand control is performed (not a request item).
(5) This is applicable only to the R410A series. Make the settings for the following dipswitches on the outdoor unit control board

before switching on the power.

Note:

3 Connection to the Indoor Unit

1

2

3

4

Pattern

Note:

*1 The fan operates at the same speed settings as shown in this

table during the Heating Thermo-OFF mode.

*2 If Pattern 2 in the table above is selected for the fan control

pattern, the fan will follow the setting of the remote controller.