Table Of Contents - Daikin ERQ Series Service Manual

ESiEN09-06 A
1. Introduction ..............................................................................................i
1. Model Names of Outdoor Unit, Control Box and Expansion Valve Kit....2
2. Combination Table ..................................................................................5
1. Specifications ..........................................................................................8
1. Refrigerant Circuit .................................................................................12
2. Functional Parts Layout ........................................................................18
1. Function general ...................................................................................22
2. Basic Control.........................................................................................24
3. Special Control......................................................................................29
4. Protection Control .................................................................................36
5. Other Control.........................................................................................41

Table of Contents

1.1 Safety Cautions .........................................................................................i
1.1 Outdoor Units ...........................................................................................2
1.2 Control Box...............................................................................................3
1.3 Expansion Valve Kit .................................................................................4
1.1 Outdoor Units ...........................................................................................8
1.1 ERQ 125 A7W1B ...................................................................................12
1.2 ERQ 200 A7W1B ...................................................................................14
1.3 ERQ 250 A7W1B ...................................................................................16
2.1 ERQ 125 A7W1B ...................................................................................18
2.2 ERQ 200 A7W1B ...................................................................................19
2.3 ERQ 250 A7W1B ...................................................................................20
1.1 Symbol ...................................................................................................22
1.2 Operation Mode......................................................................................23
2.1 Normal Operation ...................................................................................24
2.2 Compressor PI Control...........................................................................25
2.3 Step Control of Outdoor Unit Fans .........................................................27
2.4 Outdoor Unit Fan Control in Cooling Operation .....................................28
3.1 Startup Control .......................................................................................29
3.2 Oil Return Operation ..............................................................................30
3.3 Defrosting Operation ..............................................................................32
3.4 Pump-down Residual Operation ............................................................33
3.5 Standby ..................................................................................................34
3.6 Stopping Operation ................................................................................35
4.1 High Pressure Protection Control...........................................................36
4.2 Low Pressure Protection Control............................................................37
4.3 Discharge Pipe Protection Control .........................................................38
4.4 Inverter Protection Control .....................................................................39
4.5 STD Compressor Overload Protection...................................................40
4.6 Injection Control (only for ERQ 125 A7W1B) .........................................40
5.1 Emergency Operation (only for ERQ 250 A7W1B) ................................41
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