Acson international A5CM2020ER User manual

Multisplit Installation Manual

Model Reference:

A5CM2020ER

Model Reference – A5CM2020ER

Equipment - 2 off A5CM20ER matched with 1 off A5LC40CR

Configuration – Master / Slave Twinsplit

a) Mains Power

•Separate Power supplies are required to indoor and outdoor units.

•Power to each indoor unit should 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 Figure 1.1 on the following pages.

Connecting the Nim Controller and Boards.

MASTER UNIT

1. Plug the cable supplied with the Nim board into CN1 on the Nim and connect it to

CN4 on the master unit indoor pcb

2. Plug the Netware controller cable into CN2 on the Master Unit Nim board and

match the coloured wires to the corresponding coloured connections on the inside

back of the Netware controller.

Address the Master unit using the dip switches as follows:

3. Dip Switch marked DSW1 (eight switches)

LEAVE ALL SWITCHES DOWN (OFF)

4. Dip Switch Marked DSW2 (four switches)

LEAVE ALL SWITCHES DOWN (OFF)

This unit is now addressed as the master unit.

SLAVE UNIT

5. Plug the cable supplied with the Nim board into CN1 on the Nim and 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 unit Nim

board (connector is on top right of board) and note which cable plugs in to A

and which in to B as the connection has polarity.

9. Run the cable to the Slave unit Nim board and connect it in the same way.

MAKE SURE THAT THE CABLES ARE IN THE SAME CONNECTIONS

AS IN THE MASTER UNIT NIM BOARD.

The Nim Boards connection is now complete. Once power is applied the Master

unit will be controlled by the Netware controller and the Slave unit will copy the

function of the Master unit.

Figure 1.1 – Wiring Configuration for A5CM2020ER

Condensin

Unit Indoor Master Unit Indoor Slave Unit

3ph

Power

Feed E

L/ L1

N/L2

1ph

Power

Feed

4WV

Com

4 WV

Com

L/ L1

N/L2

1ph

Power

Feed

4WV

Com

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.

Figure 1.2 – Outdoor Unit High Pressure Switch Modification for A5CM2020ER.

(FOR UNITS WITHOUT 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.

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.

Figure 1.4 - Pipework Configuration for A5CM2020ER

•Pipe sizes for the A5CM20ER are 1/4” Liquid & 1/2” Gas

•Pipe Sizes for the A5LC40CR are 3/8” Liquid & 5/8” Gas

A5CM20ER

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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