Best Of
Re: Any Fujitsu guys out there?
EEVs can fail. That could be the issue especially if the two indoor heads are working and the AHU is not.
A tech with the right equipment could find the issue.
Re: Wiring HydroStat 3250 With Multiple Circs and ZVC
The ZVC-exp will exercise the valves as well as the circ but not the boiler or DHW endswitches.
Dave H_2
Re: Any Fujitsu guys out there?
Just as a test maybe shut the other two heads off temporally and see if that changes the ahu performance.
Have someone or the services tech back and check the ahu return temp and supply temp to see what is going on. Also check superheat at the ahu and at each remote head and at the condensing unit to see what is going on
Re: Any Fujitsu guys out there?
time to call tech support.
1 thing there going to ask is the weight of the charge so be prepared.
my personal tri zone a few boards were replaced before I installed a ICM493.
I’ve also changed the sensors for the EEV,s.
pecmsg
Re: Riello 40 N200S Locks out despite all checks being posative
Check grounding and polarity
Re: Wiring HydroStat 3250 With Multiple Circs and ZVC
I wouldn't run 24V in the same cable as 120V. That is never a good idea and may not meet Code. Is there an existing 120V cable between the ZVC and the HydroStat? If so, replace it with one having the extra wire.
Not sure about the exercise function, maybe one of the Taco guys will chime in here.
Re: Wiring HydroStat 3250 With Multiple Circs and ZVC
You can run the heating pump on C1 terminal of 3250. XX on ZVC to TT on 3250 is 24v only. Still need 120 from DHW pump to ZR.
Line and low voltage can not run in same conduit. Low voltage can be secured to the outside of conduit carrying line voltage but only to the appliance it’s controlling
Re: Wiring HydroStat 3250 With Multiple Circs and ZVC
TT is 24V only, 3250 has an integral transformer
Re: Do your techs wear shorts?
These didn't, at least not to The Lovely Naoko, who has the most sensitive nose I've ever encountered ;-)
@PC7060 , looks like the half-off sale is over. Current prices are roughly 25% off list.
Re: Radiator below waterline on 1PS system
I think that radiator was salvaged from somewhere else and just had a bleeder on it, I don't think it is necessary for it to work. The radiator should fill to the water line of the boiler and the air vent out through the mains and vents on the system until it is full to the water line.
Be careful about giving them a replacement with similar EDR. The part that is below the water line is what will heat and its output will only be whatever the hot water output of that area is at whatever temp the condensate is. Might be important that it has similar volume below the water line.
It is going to be cold until enough condensate has been produced by the system so it will heat a significant time after the system heats and stay warm after the system shuts off (or maybe just stay warm the whole time depending on what the cycle rate and duration of the system looks like).
Since there is no place for the air to vent out at the radiator, that riser to the main will trap a column of air and keep steam from getting to the water in the radiator and causing water hammer.
If you were to move the radiator above the water line that would require re-engineering of how it is connected to the system so that it can get steam and get rid of condensate without the condensate from the system running through it and possibly doing a 2 pipe on a 1 pipe sort of setup to allow the condensate to drain below the main.
mattmia2