Daikin VRV 3 pipe changing mode

[Thermatech]

This is the problem with Daikin VRV.

In aplication like hotel when access to all indoor units is always a problem then you really need to be able to get data from each indoor unit like,,, mode / set temp / EEV opening / return air temp / gas & liquid refrigerant temps from a remote location.
If other manufacturers VRF system is used you can get all that data from every indoor unit by service engineer setting at the outdoor circuit board & outdoor circuit board LED display.
No need for any service checker laptop computer.

The outdoor unit compressor slow down for pressure equalisation every time an indoor unit changes mode has been a big disadvantage for the VRV system.
Look at the new BSV box & you will find that instead of soleniod valves there is now 5 EEV valves !
Trouble shooting any problem with the new BSV boxes without the service checker I suspect will be an even larger challange.

[multisync]

This is the problem with Daikin VRV.

In aplication like hotel when access to all indoor units is always a problem then you really need to be able to get data from each indoor unit like,,, mode / set temp / EEV opening / return air temp / gas & liquid refrigerant temps from a remote location.
If other manufacturers VRF system is used you can get all that data from every indoor unit by service engineer setting at the outdoor circuit board & outdoor circuit board LED display.
No need for any service checker laptop computer.

The outdoor unit compressor slow down for pressure equalisation every time an indoor unit changes mode has been a big disadvantage for the VRV system.
Look at the new BSV box & you will find that instead of soleniod valves there is now 5 EEV valves !
Trouble shooting any problem with the new BSV boxes without the service checker I suspect will be an even larger challange.

Thermatech

Do you have a checker as we may need assistance to quickly get to the bottom of this ...

[VRVIII]

Thermatech

Do you have a checker as we may need assistance to quickly get to the bottom of this ...

Multi I’ll bet you Thermatech has a Mitsi checker
If you were a bit closer I could have help you out no probs, how’s the weather down there today? It’s snowing here just now.

[multisync]

Multi I’ll bet you Thermatech has a Mitsi checker
If you were a bit closer I could have help you out no probs, how’s the weather down there today? It’s snowing here just now.

He has both from what I understand.

I believe Daikins lack of digital display and 'user friendly access to info' on the outdoor unit is very outdated. The push buttion sequencing was S.O.T.A in 1990 but sadly lacking these days.
VRVIII was their ideal opertunity to come into the 2000's but they missed the boat again.Intrepreting Checker is no easy task and again very old fashioned in layout. It really needs time and familarity to fully comprehend the data.

I was going to buy Toshi Dyno Doctor (which is really good btw) but was told few use it as the display usually give enough to diagnose the problem.

Clear blue skys at the moment

[VRVIII]

He has both from what I understand.

I believe Daikins lack of digital display and 'user friendly access to info' on the outdoor unit is very outdated. The push buttion sequencing was S.O.T.A in 1990 but sadly lacking these days.
VRVIII was their ideal opertunity to come into the 2000's but they missed the boat again.Intrepreting Checker is no easy task and again very old fashioned in layout. It really needs time and familarity to fully comprehend the data.

I was going to buy Toshi Dyno Doctor (which is really good btw) but was told few use it as the display usually give enough to diagnose the problem.

Clear blue skys at the moment

Hmmm think you Mitsi guys are ganging on me now .

I know where your coming from some of the other manufactures VRF/VRV’s logic and diagnosis is easier to get your head round but I could say manually setting rotary switches to address every indoor/bc box/controller is so dated Daikin done away with this in 1990.
On newer vrv units (vrv2&vrv3) it is also possible to retrieve faults, fault history, retry history and able to identify the fault location, all from the outdoor PCB.
ie, which hp switch has caused a trip, which fan motor is causing a fault and which module has an error in multi application. However this can be quite complex to understand unless it’s demonstrated and explained, but this helps keep us in a job..

It would be interesting to see the Tosh doctor software but I’ve heard it would take more than a doctor to get there 407c vrf to operate correctly.

[VRVIII]

This is the problem with Daikin VRV.

In aplication like hotel when access to all indoor units is always a problem then you really need to be able to get data from each indoor unit like,,, mode / set temp / EEV opening / return air temp / gas & liquid refrigerant temps from a remote location.
If other manufacturers VRF system is used you can get all that data from every indoor unit by service engineer setting at the outdoor circuit board & outdoor circuit board LED display.
No need for any service checker laptop computer.

The outdoor unit compressor slow down for pressure equalisation every time an indoor unit changes mode has been a big disadvantage for the VRV system.
Look at the new BSV box & you will find that instead of soleniod valves there is now 5 EEV valves !
Trouble shooting any problem with the new BSV boxes without the service checker I suspect will be an even larger challange.

Theratech,

Your obviously a Mitsi man at heart .
But you can’t blame the equipment if you encounter limited access to indoor units; personally I think it’s a case of which ever equipment you are most familiar with and personal preference, Daikin also has a lot of plus points over Mitsi and vice versa. Most of the engineers I know say Daikin VRV is far easier and quicker to commission (I can see a poll being started here).
The fault finding process obviously differs between manufactures and a Daikin service checker is only a tool that allows you view and record all operation data simultaneously but as with any tool it’s only as good as the engineer using it.

The current VRVIII heat recovery system no longer has to equalize when a bs box changes mode, this is now done by slowly operating the motorized valves in the box (the additional valves you refer to). Allowing full capacity to all other indoors when a box changes mode.
The outdoor also has independent heat exchanger control which only allows 1 heat exchanger to carry out a defrost cycle while the other continues to operate as an evaporator. The unit can then continue supplying hot gas to indoors, resulting in reduced capacity loss during defrosts cycle.

P.S. Have you changed your problem box yet? Did it cure the noise?