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Figure 1.3 – Outdoor Unit High Pressure Switch Modification for A5CM2020ER  

(FOR UNITS FITTED WITH PHASE PROTECTION BOARD) 
 

A modification is required to ensure that the high pressure switch remains operational when using the A5LC40CR in a 

multisplit application. 

 
Carry out the modification on site as follows: 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

1. Remove 

Blue

 Wire from 

contactor at point 

A2

 and 

Mains Neutral Terminal 

and discard.

2. Remove 

Black 

High

 

Pressure Switch Wire from 

Terminal A

 and re-connect 

directly to point 

A2

 on the 

contactor. 

 

Summary of Contents for A5CM2020ER

Page 1: ...Multisplit Installation Manual Model Reference A5CM2020ER ...

Page 2: ...ld be 240v 1ph with a 5amp motor rated fuse supply Power to outdoor unit should be 420v 3ph with a 25amp per phase fuse supply b Interconnecting and Control Cables From Outdoor Unit to Indoor Master Unit 3 Core Master Unit to Slave Unit control using 2 off Nim Boards and One off Netware Controller Slave Unit Outdoor Fan Sensor connection on PCB fitted with resistor c Wiring Configuration See Figur...

Page 3: ... connect it to CN4 on the slave unit indoor pcb Address the Slave unit as follows 6 Dip Switch marked DSW1 eight switches LEAVE ALL SWITCHES DOWN OFF 7 Dip Switch marked DSW2 four switches LEAVE SWITCH 1 2 3 SET DOWN OFF MOVE SWITCH 4 UP ON This unit is now addressed as the slave unit number 1 Connect the Nim Boards together as follows 8 Connect a two core cable of about 75mm to CN3 on the Master ...

Page 4: ...E 3ph Power Feed E L L1 N L2 1ph Power Feed 4WV Comp OF OF A 4 WV Comp N L E L L1 N L2 1ph Power Feed 4WV Comp OF E Field Wiring NOT USED NOT USED NOTES 1 Nim PCB and Netware setup are as per normal Master Slave wiring configuration 2 OD Coil Sensor on SLAVE UNIT is linked out with the resistor 4 7Kohm supplied ...

Page 5: ...nsure that the high pressure switch remains operational when using the A5LC40CR in a multisplit application Carry out the modification on site as follows 1 Remove Blue Wire from contactor at point A2 and Mains Neutral Terminal and discard 2 Remove Black High Pressure Switch Wire from Terminal A and re connect directly to point A2 on the contactor ...

Page 6: ... ensure that the high pressure switch remains operational when using the A5LC40CR in a multisplit application Carry out the modification on site as follows 1 Remove Blue Wire from contactor at point A2 and Mains Neutral Terminal and discard 2 Remove Black High Pressure Switch Wire from Terminal A and re connect directly to point A2 on the contactor ...

Page 7: ...0ER Cassette Master Unit A5CM20ER Cassette Slave Unit 5 8 Gas 3 8 Liquid 1 2 Gas 1 4 Liquid 1 2 Gas C U NOTES 1 A reducing Tee is necessary where pipework is split between each cassette on BOTH Liquid and Gas Lines 2 The distance from the tee to each indoor unit MUST be more or less equal to prevent liquid flooding one of the cassettes and starving the other ...

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