Symptom

 

Cause

3 “HO” display on re-

(Without using MELANS)

mote controller does

1)

Outdoor unit address is set to “00”

not disappear and

2)

Erroneous address.

ON/OFF switch is

 

1 Address setting of indoor unit to be coupled with remote controller incorrect.

ineffective.

 

(Indoor unit = remote controller - 100.)

2Address setting of remote controller incorrect. (Remote controller = indoor unit + 100.)

3)Faulty wiring of transmission terminal block TB5 of indoor unit in the same group with remote controller.

4)Centralized control SW2-1 of outdoor unit is turned ON.

5)Setting to interlocking system from indoor unit (Switch 3-1 = OFF), while Fresh Master is intended to be use by remote controller operation (indoor unit attribute).

6)Disconnection or faulty wiring of indoor unit transmission line.

7)Disconnection between indoor unit M-NET transmission line terminal block (TB5) and connector CN2M.

8)More than 2 sets of power supply connector (CN40) are inserted into centralized control transmis- sion line of outdoor unit.

9)Faulty outdoor unit control circuit board.

10)Faulty indoor controller board. 11)Faulty remote controller.

(Interlocking control with MELANS)

12)No grouping registration from MELANS (Neglecting to set the relation between indoor unit and network remote controller).

13)Disconnection of centralized control transmission line (TB7) at outdoor unit.

14)At system connected with MELANS, power supply connector (CN40) is inserted to centralized control transmission line of outdoor unit.

Checking method & countermeasure

In case MELANS is not used

Same symptom for all

NO

units in a single refriger-

 

ant system?

 

YES

Confirm address of remote

 

controller with “HO” displayed

Check outdoor unit

 

 

 

 

 

address

 

 

 

 

 

 

 

 

Address setting

NO

 

 

NO

Outdoor unit

miss of remote

 

Indoor unit + 100?

51 ~ 100?

controller

 

 

 

address set-

 

YES

 

 

ting miss

 

 

YES

 

 

 

 

 

 

 

 

Check address of

Check centralized

 

 

 

 

 

 

 

 

coupling indoor unit

control switch SW2-1 at

 

 

 

 

 

outdoor unit

 

 

 

 

 

 

 

Switch setting

Indoor address

NO

Remote controller

 

YES

setting miss

 

ON?

miss

 

-100?

 

 

 

 

 

Change from

 

 

YES

NO

 

ON to OFF

 

 

 

 

 

 

 

Faulty outdoor unit

Check voltage of indoor unit M-

NET transmission terminal block

control circuit board

 

Transmission line

 

wiring miss of in-

NO

door unit M-NET

17 ~ 30V?

 

YES

Check connection between indoor unit M-NET trans- mission terminal block (TB5) and connector CN2M

Disconnection

YES

of CN2M

Disconnection

connector

NO

 

 

Check Fresh Master SW3-1

Setting miss of

NO

ON?

Fresh Master

 

SW3-1

YES

 

 

Faulty indoor controller board

 

or remote controller

Repair spot in trouble

In case with MELANS used

When MELANS is used, “HO” display on the remote controller will disappear at the group registration of the indoor unit and local remote controller.

If “HO” does not disappear after the registration, check the items 12) ~ 14) in the Cause column.

–80–

Page 81 Page 83
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Image 82
Mitsubishi Electronics P500YMF-C, PURY-P400 specifications Checking method & countermeasure Case Melans is not used
Page 81 Page 83

PURY-P400, P500YMF-C specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, known for its innovative technology and reliable performance. Among its notable offerings are the P500YMF-C and PURY-P400 models, designed to address the diverse needs of commercial and residential applications.

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