Tips and Tricks

The CZ-RTC2 used with all PACi and VRF systems is far more than a simple room controller and it can be used for a number of things that might surprise you. Some of these things can be done by the simple wired controller CZ-RE2C2 controller as well.

Stop Press - New remote controller CZ-RTC3

The new CZ-RTC3 controller has a maintenance mode which can do most of the things that the CZ-RTC3 can do. To access this press RETURN, ENTER and RIGHT ARROW for four seconds. You can then check outdoor unit fault codes, set the service contact details, change details of the controller, operate test run, check all indoor thermistors readings, perform self address and change both simple and detailed settings all using a simple menu structure.

What the buttons are called on the CZ-RTC2

  1. ON/OFF switch
  2. Operation light
  3. MODE
  4. TEMP UP and DOWN
  5. FAN
  6. SWING
  7. UNIT
  8. Timer control group including PROGRAM, TIMER UP & DOWN, SET and CANCEL
  9. FILTER reset
  11. SPANNER or inspection

And on the CZ-RE2C2

  • A - ON/OFF
  • B - TEMP UP & DOWN
  • C - MODE
  • D - FAN
  • E - SWING
  • F - OUTING


Full details are in the appropriate manual but the important things to know about the CZ-RTC2 are shown below

Test Run

Operated with the SPANNER button on the standard controller this initiates a test run on only those units connected to the controller. Use the SPANNER button to cancel.

On the simple controller hold ON/OFF and SWING for four seconds then press the ON/OFF button. To cancel press ON/OFF and SWING again for four seconds

Sensor Display

Hold SPANNER and CANCEL together for four seconds. Use the UNIT button to switch between different indoor units and temperature UP and DOWN buttons to scroll through the different sensor readings. Press SPANNER to cancel.

On the simple controller hold SWING and OUTING for 4 seconds to enter the sensor check mode, select the required indoor unit with the TEMP UP button and MODE to confirm then scroll through the sensors using the TEMP UP or DOWN buttons. Once you are at the sensor code you want press MODE and the sensor reading will be shown. Press OUTING to go back a step and SWING to leave sensor display mode

The important sensors are 01 which is the temperature at the handset, 02 which is the return air temperature, 03, 04 & 05 which are the coil sensors (only two of these will be connected and give a meaningful reading and 06 which is the air outlet temperature. The full set is shown below though -

Alarm History

Hold SPANNER and SET for 4 seconds then use TEMP UP and DOWN to check the fault code history

On the simple controller press MODE and SWING together for four seconds then use TEMP UP and DOWN to scroll through the alarm history. Press SWING to exit.

For the list of fault codes go to the Panasonic Trouble shooting section and download the relevant sheet

Simple and Detailed Settings

A very large amount of settings inside the units electronics can be changed using the Simple and Detailed settings. The simple settings go from 01 to 0F and the important ones are -

  • 01 - Filter warning time where value 0000 is off, 0001 is 150 hours, 0002 is 2,500 hours
  • 03 - Central Control Address
  • 0d - Automatic heating and cooling - 0000 is allow and 0001 is prohibit
  • 0E - Do the slaves follow the masters mode of operation - 0000 is no and 0001 is yes
  • 0F is cooling only operation - 0000 is no while 0001 is yes

The detailed settings are all of the other and the important ones there are

  • 14 - Master Slave Setting - 0000 is 1to1, 0001 is Master unit, 0002 is Slave unit and 0099 is not set
  • 2C - Indoor unit EEV - 0000 is yes and 0002 is no
  • 2E - T10 interface - 0000 is normal, 0001 is off reminder and 0002 is fire alarm interlock
  • 31 - Ventilation Fan Output - 0000 is off and 0001 is on
  • 32 - Wired controller inbuilt sensor - 0000 is return air sensing and 0001 is controller sensor sensing
  • 33 - Celsius or Fahrenheit - 0000 is Celsius and 0001 is Fahrenheit
  • 3A - Air outlet temperature control - 0000 is off and 0001 is on
  • 3b - RAP Valve present - 0000 is no and 0001 is yes

To access the simple settings on the standard controller press SPANNER and VENTILATION for four seconds, use the UNIT button to swap between indoor units (the indoor unit being controlled will switch its fan on and the other units will switch theirs off so you know which unit you are talking to) or select ALL to change all indoor units together and the TEMP UP and DOWN buttons to switch between settings. Use the TIMER UP and DOWN buttons to make a change to a setting then SET to confirm. Don't forget to SET to confirm or your change will be lost. Press SPANNER to come out of this mode.

To access the detailed settings on the controller then do the same as for the simple settings but use SPANNER, SET and CANCEL instead of SPANNER and VENTILATION.

For the simplified controller you access both the simple and detailed settings in the same way. Hold MODE, OUTING and SWING down for four seconds then use TEMP UP and DOWN to select the unit and press MODE to confirm. Then use TEMP UP to scroll up through the detailed settings or TEMP DOWN to scroll down through the simple settings. When you have reached the setting that you want to check or change then press MODE to confirm and the value will be shown. Change the value using the TEMP UP and DOWN buttons and press MODE to confirm. To go back a step press OUTING and to leave this mode press SWING.

A fuller list is shown here

Automatic Address

You can do a complete system auto address from the standard controller

Press SPANNER and TIMER UP for four seconds. Use the TEMP UP or DOWN buttons to select A1. Use the UNIT button to select the system to auto address and then press SET to confirm. The unit will then perform a self address on that system.

Alternatively if you have multiple systems connected onto the same P-Net you can do a full system self address by not selecting a system when you reach A1 as described above and just going straight to SET. This will then run each outdoor unit in sequence in cooling and attached the indoor units that get cold to the outdoor unit that is operating at that moment in time. This takes around 15 minutes per system and can save a lot of time.

Before you do an automatic address please make sure that the system address has been set at the outdoor unit and that the number of indoor units attached to that particular outdoor unit (VRF only) has also been set at the outdoor unit. Failure to do this will result in the automatic address failing.

Outdoor Unit Service Checker

This is phenomenally useful and every engineer serious about working on Panasonic or Sanyo legacy systems should keep a CZ-RTC2 controller and interface plug in his or her tool bag for this purpose.

Better still you can buy a Simple Service Checker CZ-SERVICES from us which has the controller plus a pair of PCB plugs for both Sanyo and Panasonic outdoor PCBs plus a pair of crocodile clips and a CD of technical manuals covering all current systems.

This works for PACi and ECOi. It is not required for GHP as you can do all of this from the outdoor PCB.

Connect the controller to the outdoor unit on a PACi or mini ECOi as below. With an ECOi you only need to connect the controller to the two terminals 3 and 4 that connect the outdoor units together.

Once this is done you can take control of the entire system from outdoors.

Emergency Plug (EMG)

A particularly useful feature of PACi and ECOi systems is the Emergency Plug EMG.

A major weakness of all modern electronic control systems is the potential for human error in connecting mains Voltage to the communications data bus. This usually results in many thousands of pounds worth of damage as every indoor and outdoor PCB connected to the network is blown up beyond reasonable hope of repair.

With ECOi and PACi however this is often not the case because a redundant data circuit is built into the indoor and outdoor PCBs.

Normally the P-Net communication line U1U2 connects onto Plug OC on the indoor and outdoor PCB. But if you have a catastrophic failure due to mains Voltage being introduced onto the P-Net then the answer is to go round every indoor and outdoor PCB and moving the plug inserted into OC and moving it into EMG. Most of the time this will result in the PCB being saved.

If you come across a PCB where there is no plug in OC and there is one in EMG then this is clear evidence that the system has suffered a high Voltage incident on the P-Net at some point in the past.

Outdoor Unit Jumpers

The PCBs on Panasonic PACi & ECOi outdoor units have a number of two pin terminals that can be shorted to achieve various objectives -

A-ADD - Auto Address - short for 1 second to perform an automatic self address on the system

RUN - Short for 1 second to start all indoor units on that outdoor unit

STOP - Short for 1 second to stop all indoor units on that outdoor unit

PUMPDOWN (or AP) - Short across these pins for up to 10 minutes to force cooling for pump down purposes

MODE - Short across while doing a multi system self address to use cooling rather than heating mode. Shorting during normal operation switches the current operation from heating to cooling or vice versa.

TEST - Factory use only

CHK - Short circuit for test operation - remove short to stop test operation

Indoor Unit Jumpers

There are a series of jumpers on the indoor unit PCBs as well for the purposes below

EXCT - External demand control - when shorted the indoor unit turns off

DISP - Display Mode - When shorted disables the U1U2 data bus to allow the indoor unit and controller to be operated regardless of whether there is an outdoor unit connected or not.

CHK - Check Mode - When shorted runs the fan on high speed, operates the drain pump, fully opens the EEV and moves the louver to F1 position

JP1 - Jumper wire - leave connected if using the T10 plug for pulsed stop start or cut for continuous signal