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4-5. Emergency Operation (Heating Operation under<br />

Header Outdoor Unit Backup Scenario)<br />

Leakage from PMV:<br />

Liquid-side service valve<br />

= Full closure<br />

Header unit (MMY-MAP1604*)<br />

Failure<br />

Set Up as Temporary<br />

Header Unit during<br />

Emergency Operation<br />

Follower unit (MMY-MAP1604*)<br />

FM<br />

FM<br />

TO<br />

TO<br />

PMV1<br />

PMV2<br />

PMV1<br />

PMV<br />

PMV4<br />

TE2<br />

TE1<br />

PMV<br />

TE2<br />

TE1<br />

4-Way valve<br />

4-Way valve<br />

Pressure sensor<br />

(high pressure)<br />

SV6<br />

SV<br />

TS1<br />

Pressure sensor<br />

(high pressure)<br />

SV6<br />

SV<br />

TS1<br />

SV<br />

SV<br />

TL<br />

SV3D<br />

O.S.<br />

SV2<br />

Pressure sensor<br />

(low pressure)<br />

TL<br />

SV3D<br />

O.S.<br />

SV2<br />

Pressure sensor<br />

(low pressure)<br />

SV<br />

SV<br />

Liquid tank<br />

SV41<br />

SV<br />

TD1<br />

HPS<br />

SV3C<br />

SV<br />

HPS<br />

SV<br />

SV42<br />

TD2<br />

HPS<br />

SV Accumulator<br />

SV43<br />

TD3<br />

Liquid tank<br />

SV41<br />

SV<br />

TD1<br />

SV3C<br />

HPS<br />

SV<br />

HPS<br />

SV<br />

SV42<br />

TD2<br />

HPS<br />

SV Accumulator<br />

SV43<br />

TD3<br />

Compressor<br />

1<br />

TK4<br />

Compressor<br />

2<br />

Compressor<br />

3<br />

Compressor<br />

1<br />

TK4<br />

Compressor<br />

2<br />

Compressor<br />

3<br />

TK1<br />

TK2<br />

TK3<br />

TK1<br />

TK2<br />

TK3<br />

SV<br />

TK5<br />

SV3E<br />

SV<br />

SV3F<br />

SV<br />

TK5<br />

SV3E<br />

SV<br />

SV3F<br />

SV3A<br />

SV<br />

SV<br />

SV3B<br />

SV3A<br />

SV<br />

SV<br />

SV3B<br />

Gas-side service valve<br />

= Full closure<br />

Balance pipe packed valve<br />

= Full opening<br />

Balance pipe<br />

Liquid pipe<br />

Gas pipe<br />

Gas pipe<br />

Liquid pipe<br />

PMV<br />

PMV<br />

PMV<br />

PMV<br />

TC2<br />

TCJ<br />

TC1<br />

TC2<br />

TCJ<br />

TC1<br />

TC2<br />

TCJ<br />

TC1<br />

TC2<br />

TCJ<br />

TC1<br />

Indoor unit<br />

High-pressure gas or condensate liquid refrigerant<br />

Evaporative gas refrigerant (low-pressure gas)<br />

Normal refrigerant line<br />

Refrigerant recovery line<br />

Note: The "header unit" is the outdoor unit to which the indoor-outdoor communication<br />

line is connected. All other outdoor units are called "follower units".<br />

(The diagram shows a 32 HP system<br />

(16 HP + 16 HP) as an example.)<br />

68

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