Mitsubishi Electric PUHZ-HA2 Installation Manual download pdf (Page 10)

10.System control (Fig. 10-1)

* Set the refrigerant address using the DIP switch of the outdoor unit.

1 Wiring from the Remote Control

This wire is connected to TB5 (terminal board for remote controller) of the indoor unit

(non-polar).

2 When a Different Refrigerant System Grouping is Used.

Up to 16 refrigerant systems can be controlled as one group using the slim MA re-

mote controller.

Note:

In single refrigerant system (twin/triple), there is no need of wiring 2.

Operation according to switch setting

ON OFF

Start Normal

Clear Normal

Settings for outdoor unit ad-

dresses 0 to 15

SW1

Function table

<SW1>

Function

1 Compulsory de-

frosting

2 Error history clear

123456

OFF

A Outdoor unit

B Indoor unit

C Master remote controller

D Subordinate remote controller

E Standard 1:1 (Refrigerant address = 00)

F Simultaneous twin (Refrigerant address = 01)

G Simultaneous triple (Refrigerant address = 02)

TB4

TB5

TB1

TB4

TB5

TB4

TB1

TB4

TB1

TB4TB4

TB5

BBBBBB

AFGE

OFF

3456

E SW 1 - 3 ~ 6

OFF

3456

F SW 1 - 3 ~ 6

OFF

3456

G SW 1 - 3 ~ 6

SW1

function

settings

Fig. 10-1

Refrigerant sys-

tem address set-

ting

9. Special Functions

9.1. Low noise mode (on-site modification) (Fig. 9-1)

By performing the following modification, operation noise of the outdoor unit can be

reduced by about 3-4 dB.

The low noise mode will be activated when a commercially available timer or the

contact input of an ON/OFF switch is added to the CNDM connector (option) on the

control board of the outdoor unit.

• The ability varies according to the outdoor temperature and conditions, etc.

1 Complete the circuit as shown when using the external input adapter (PAC-

SC36NA). (Option)

2 SW1 ON: Low noise mode

SW1 OFF: Normal operation

9.3. Refrigerant collecting (pump down)

Perform the following procedures to collect the refrigerant when moving the indoor

unit or the outdoor unit.

1 Supply power (circuit breaker).

* When power is supplied, make sure that “CENTRALLY CONTROLLED” is not

displayed on the remote controller. If “CENTRALLY CONTROLLED” is dis-

played, the refrigerant collecting (pump down) cannot be completed normally.

2 After the gas stop valve is closed, set the SWP switch on the control board of the

outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor and

outdoor units) start operating and refrigerant collecting operation begins. LED1

and LED2 on the control board of the outdoor unit are lit.

* Only set the SWP switch (push-button type) to ON if the unit is stopped. How-

ever, even if the unit is stopped and the SWP switch is set to ON less than

three minutes after the compressor stops, the refrigerant collecting operation

cannot be performed. Wait until compressor has been stopped for three min-

utes and then set the SWP switch to ON again.

3 Because the unit automatically stops in about two to three minutes after the refrig-

erant collecting operation (LED1 and LED2 are lit), be sure to quickly close the

gas stop valve. When LED1 and LED2 are lit and the outdoor unit is stopped, open

the liquid stop valve completely, and then repeat step 2 after three minutes have

passed.

* If the refrigerant collecting operation has been completed normally (LED1 and

LED2 are lit), the unit will remain stopped until the power supply is turned off.

4 Turn off the power supply (circuit breaker).

A Circuit diagram example (low noise mode)

B On-site arrangement

C External input adapter (PAC-SC36NA)

SW1

CNDM

Red

Brown

Orange

BCD

D Outdoor unit control board

E Max. 10 m

Fig. 9-1

9.2. Demand function (on-site modification) (Fig. 9-2)

By performing the following modification, energy consumption can be reduced to 0–

100% of the normal consumption.

The demand function will be activated when a commercially available timer or the

contact input of an ON/OFF switch is added to the CNDM connector (option) on the

control board of the outdoor unit.

1 Complete the circuit as shown when using the external input adapter (PAC-

SC36NA). (Option)

2 By setting SW7-1 and SW7-2 on the control board of the outdoor unit, the energy

consumption (compared to the normal consumption) can be limited as shown

below.

SW7-1 SW7-2 Energy consumption (SW2 ON)

OFF OFF 0% (Stop)

ON OFF 50%

OFF ON 75%

A Circuit diagram example (Demand

function)

B On-site arrangement

C External input adapter (PAC-SC36NA)

D Outdoor unit control board

E Max. 10 m

Fig. 9-2

SW2

CNDM

Red

Brown

Orange

BCD

8. Initial settings for refrigerant leakage detection function

[Display D] Waiting for stabilization

Stabilized

After 45 minutes

Fig. 8-3

3 Press

FILTER

( ) button to confirm. (Fig. 8-3)

s How to finish the initial learning

Once the unit’s operation is stabilized, the initial learning is completed.

4 Press

TEST

button for more than three seconds to cancel the initial learning.

The initial learning can also be cancelled by pressing

ON/OFF

button.

* Refer to the Technical Manual for the refrigerant leakage detection judgment method.

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Mitsubishi Electric PUHZ-HA2 Installation Manual Page 10

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