DOWNLOAD Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 / S-15M / S-22M / S-28M / S-36M / S-45M / S-60M / S-73M / S-90M / S-106M / S-140M / S-160M Service Manual ↓ Size: 7.63 MB | Pages: 127 in PDF or view online for FREE

1 - 19

• 

• 

• 

This system includes a high-pressure sensor.

12-1. High-Pressure Sensor Failure
Connector disconnection or displacement failure is judged according to the relationship between the high-pressure
sensor temperature, which is detected by the high-pressure sensor, and the various temperature thermistors.
However, if the pressure rises suddenly, a high-pressure sensor failure warning may be judged before the high-
pressure sensor activates. Therefore check the following before determining that a pressure sensor failure has
occurred:

Has the service valve been left open?

Is there a blocked circuit?

Is there leakage of refrigerant into stopped outdoor units?

Also check the difference between the high-pressure pressure as measured by a manifold gauge and the pressure
as detected by the pressure sensor.

When a 4-way valve coil failure, coil disconnection or similar failure occurs, a judgment is made automatically from
the operating conditions, and an alarm is output.

P16

Occurs when overcurrent (32.5 A) is detected during normal 
operation.

P29

Occurs when a missing phase or overcurrent (48 A) is detected 
when the inverter compressor starts.

H31

Occurs when the HIC detects overcurrent (75 A), and when an 
abnormal temperature (150°C) is reached.

The inverter current values include primary current and secondary current. 
Alarm judgment uses both of these current values. However, in general the secondary 
current is higher than the primary current.

H03

Occurs when an open circuit is detected in the inverter
compressor CT circuit.

F16

High-pressure sensor failure

Compressor 1

(inverter compressor)

If the operating frequency of the inverter compressor is low, the current value is also low. 
As a result, this alarm is detected only when the compressor is stopped.

SM830195-03_Mini VRF SYS.indb   19

SM830195-03_Mini VRF SYS.indb   19

2014/09/04   18:14:07

2014/09/04   18:14:07

1 - 20

(1)

(2)

The below functions are available, and are selected by the outdoor unit EEPROM settings.

This function reduces the operating noise to lessen the noise produced by the outdoor unit. When this mode is
selected, noise reduction is given priority during operation, and the outdoor fan mode and compressor operating
frequency are restricted (to approximately 80% of capacity).
The following two operations are required in order to engage this mode. (This mode cannot be engaged when nei-
ther (1) nor (2) below has been completed.)

Outdoor unit EEPROM settings

Outdoor unit EEPROM 05 can be set from 0 to 1.

Short-circuit the “SILENT”2P pin on the outdoor unit PCB.

14-3. Delayed Start for Each System:Outdoor EEPROM 3E
The operation start time can be delayed according to the set system addresses.
This setting reduces voltage drops by preventing multiple systems from starting at the same time when operation is
restarted after recovery when multiple operating systems were stopped due to a power outage or other cause.

Noise reduction mode is engaged constantly when this pin is short-circuited. To operate in noise reduction 
mode only at night, or for similar control at other times, use an external timer (field supply).

This setting controls the operation of the drain pump.

Normal operation (setting at time of factory shipment)

100%

14

12

5 and 6 hp units. Noise reduced by approx. 3 dB from the catalog value.

Only 4 hp unit. Noise reduced by approx. 3 dB from the catalog value.

1

11

0

Approx. 80%

Normal operation (setting at time of factory shipment)

1

0

2

Drain pump operates for 20 minutes at 2-hour intervals

Drain pump operates for 20 minutes, at intervals of 20 minutes

3

Drain pump operates continuously

Delayed start is not performed (setting at time of factory shipment)

System address: Delay in seconds before start

2

1

0

3

Start after System address × 2 seconds

Start after System address × 3 seconds

12

Enter shift value 
for indoor EEPROM 
setting “1C.”

50

Enter shift value 
for indoor EEPROM 
setting “1D.”

The method is the same as ordinary indoor unit discharge temperature shift.

<Reference> Indoor unit discharge temperature control

SM830195-03_Mini VRF SYS.indb   20

SM830195-03_Mini VRF SYS.indb   20

2014/09/04   18:14:07

2014/09/04   18:14:07

1 - 21

Demand terminal block (optional CZ-CAPDC3) or Seri-Para I/O unit (optional CZ-CAPDC2) must be connected 
in order to perform demand control. 
The current limitation values can be set by changing either contact.

* The rated current indicates the current value that is listed in the catalog or service manual.

During setting in LV1-LV3,

(demand-activated) displays on the remote controller of the indoor unit.

*

*

*

In respect of connection method for demand terminal block and Seri-Para I/O unit, refer to the installation 
instructions supplied with the units.

XX% is possible to change among 40 to 100% (5% interval scale) by the indoor unit EPROM.

Outdoor Unit EEPROM Setting :  The display mark for demand function is selectable by changing 1E as shown 

below.

[1A]:100% at shipment /  [1B]:70% at shipment

It is also possible to make setting that the display (symbol of demand-activated) is concealed as shown 
in the following table.

: Input present

: Input not present

EEPROM Setting

0

1

2

No mark is displayed even in demand-activated mode.

When demand input is ON, demand-activated mark is displayed. (At factory shipment)

When demand is set to LV3 (forced thermostat OFF), demand-activated mark is display.

Description

Seri-Para I/O unit

Demand terminal block

COM short circuit

Non

LV1

LV2

LV3

Contact 1

Contact 2

No control

Operates to the maximum capacity.

Operates to XX% [EEPROM:1A] 
of the upper limit for the rated 
current

Current is limited to the set values.

Operates to XX% [EEPROM:1B] 
of the upper limit for the rated 
current

Current is limited to the set values.

-

Control

Demand meaning

Forced thermostat OFF setting

SM830195-03_Mini VRF SYS.indb   21

SM830195-03_Mini VRF SYS.indb   21

2014/09/04   18:14:07

2014/09/04   18:14:07

1 - 22

SM830195-03_Mini VRF SYS.indb   22

SM830195-03_Mini VRF SYS.indb   22

2014/09/04   18:14:08

2014/09/04   18:14:08