Toshiba MMU-AP0242H [118/131] Caution

118

11. P.C. BOARD EXCHANGE PROCEDURES

11-1. Exchange of P.C. Board for Indoor Service

CAUTION

<Model Name: MMU-AP

✻✻✻✻✻✻

✻✻✻ 2H>

For the above models, set the CODE No. to “+- ” and the setting data 0000 (initial) to “0001”

<Note: when replacing the P.C. board for indoor unit servicing>

The nonvolatile memory (hereafter called EEPROM, IC503) on the indoor unit P.C. board before replacement

includes the model specific type information and capacity codes as the factory-set value and the important

setting data which have been automatically or manually set when the indoor unit is installed, such as system/

indoor/group addresses, high ceiling select setting, etc. When replacing the P.C. board for indoor unit servicing,

follow the procedures below.

After replacement completes, confirm whether the settings are correct by checking the indoor unit No., Group

header unit/follower unit settings and perform the cooling cycle confirmation through the trial operation.

Case 1

Before replacement, the indoor unit can be turned on and the setting data can be read out by wired

remote controller operation.

EEPROM data read out [1]

(Refer to page 119.)

Replacement of P.C. board for indoor unit servicing and power on [2]

(Refer to page 119.)

Writing the read out EEPROM data [3]

(Refer to page 120.)

Power reset

(for all indoor units connected the remote controller when the group operation control is performed.)

Case 2

The EEPROM before replacement is defective and the setting data cannot be read out.

Replacement of P.C. board for indoor unit servicing and power on [2]

(Refer to page 119.)

Writing the setting data to EEPROM such as high ceiling installation setting

and optional connection setting, etc., based on the customer information. [3]

(Refer to pace 120.)

Power reset

(for all indoor units connected to the remote controller when the group operation control is performed.)

Part code

431-6V-379

Models

MMU-AP

✻✻✻✻✻✻

✻✻✻ 2H series

P.C. board

MCC-1570