Pump down mode isn't going to help with recovery, but with m-tool you can open all the solenoids in the BC for faster recovery. If you do the solenoids you don't have to worry about opening the...
Type: Posts; User: FlyersFan
Pump down mode isn't going to help with recovery, but with m-tool you can open all the solenoids in the BC for faster recovery. If you do the solenoids you don't have to worry about opening the...
There's an additional bit of software you have to install to run the M&P cables.
Download and install FT_prog here: https://ftdichip.com/utilities/
And the DTXX drivers here:...
That black pipe nipple on the water heater pressure test tap makes me think that there either is or was a sidewall vent kit on that water heater. OP where do the vents from the furnace and the water...
Quick search on the interwebs took me to the product data which says the indoor fan runs constantly by design. Cannot be changed.
I'm pretty sure the minimum heat setting is 63° unless you have the kumo wireless adapter, which will give you a minimum heat setting of 50°.
If the MHK2 won't set down to 63° then go into the...
Also confused. If your total load calc is 2 tons, why put in 4 tons of air conditioners? Performance data on that model shows that low speed cooling is only 4-5K BTU lower than high speed cooling...
The 5kW heater that VTP99 posted isn't a match for the PVA36, but you could use the 10kW Mitsubishi heater and leave one of the relays not connected to the air handler since each 5kW heater bank has...
Are you sizing these indoor units for cooling or heating? If you're sizing for heating you're going to be battling basement humidity all summer long and will likely need a dehumidifier to keep the...
The MXZ-2C20NAHZ2 has been replaced with the MXZ-2C20NAHZ4. Any time there's a change in the equipment or the testing process, like SEER2, it gets a new number designation. They stopped the NAHZ2...
Did you erase the outdoor unit connected information after changing the indoor board and let the outdoor unit go out and try to find it? Also, have you hooked Maintenance Tool up to see if that unit...
If you have the space for two 40 gallon heaters I'd go that way based solely on economics, because 2 40 gallon are cheaper to buy than 1 80 gallon. It's been quite a while since I've done any...
It's a tough call since you have one unit serving 2 floors. If there's only a W1 or Y1 call when it's set up for 2 stage the fan will run at a lower speed, which could affect the upstairs...
The return is definitely on the back. The front is where your drain line and electrical are. Site rules prohibit us from telling you how to open up the equipment to check configuration stuff,...
You do lose the full variable speed control, and error reporting, when using the thermostat interface. Since you're only using W1/Y1 the interface has to be configured for using a single stage input...
I find it hard to believe that you have 2 bad/grounded compressors out of the box. PUMY compressors can take a lot of abuse before they give up the ghost so I'd say there's definitely something...
Early generations of the GE indoor units are not compatible with the MHK1 even though they have the cn105 plug. If there's not a "-8" or "-9" after the model, it's a no go.
It sounds like both companies are guessing at sizing unless someone has run a load calculation already. If you oversize the heads in the small bedrooms they're going to overheat like crazy. Go to...
The Mitsubishi can do it, mostly. The indoor units have a backup heat connector for a 12V relay that can be used to control the zone valves, and the outdoor unit can be programmed to run only the...
Your question was answered in post number 2. The SUZ unit won't turn down below 50% (ish) as stated in the submittal on Mylinkdrive, and Mitsubishi doesn't publish the algorithms on what exactly...
Variable speed compressors don't like to stay ramped down because of poor oil return. That's not Mitsubishi specific, it's pretty much standard. As far as sizing goes, size on what the space needs...
So do you still have a 30K indoor unit serving a 13.5K load as stated in a previous post? If so, the minimum capacity on the unit just about matches your load calc. System won't run at minimum...
On the GL models? Rarely, but often enough to check. On the FH models a ton. It used to be that they just failed open or shorted, but not so much lately.
The other thing to check is the indoor coil thermistors. See if they ohm out according to the specs in the manual. If one of them is reading high temp/low ohms it'll cause the compressor to ramp...
Mitsubishi backup heating logic is strange at best, and the system will do all that it can to not run the backup heat whether it's electric or hot water. With kumo and the kumo station you can at...
Discharge pressure is garbage for sure, but what about the true suction pressure? It has a true suction port in the compressor compartment for checking in heat mode. Off the cuff answer I'd say ohm...
Probably a combination of compressor run time, defrost sensor temperature, outdoor temperature, time of last defrost. A lot of inverter mini splits have a max defrost time and it will look at how...
If you're looking for something easy and relatively cheap, I'd probably just wire in an old school adjustable fan and limit in parallel with the blower control wiring. Duct heats up, fan limit...
The combination you're looking at has a minimum capacity of about 50% of rated capacity depending on mode and outdoor temperature.
Mitsubishi is never going to give up the algorithm on paper, but...
That's going to be a function setting on the outdoor unit. If it's a newer generation (TKMU, TLMU, TNU) it's done with a combination of dip switches. Go to the service manual of the outdoor unit on...
What model outdoor and indoor units? Mitsu heat pumps, City Multi anyway, have a dip switch to allow auto mode from the lowest indoor address.
All MSZ-GL models have a functional cn105 plug, it was the GE models that depended on a particular service reference number to determine whether cn105 was active. From Mitsubishi your options are...
The zone board you're talking about doesn't do "partially open" zones unless someone sets a minimum position on the damper by adjusting some stops. Otherwise, the dampers will be fully open when...
One flaw in the logic of having a zone board control only the dampers and a Mitsubishi controller running the heat pump is this: What if a zone thermostat was calling for heating or cooling but the...
The numbers you need to be looking for are maximum number of connected indoor units and maximum connected capacity. If all that you want to connect fits into those specs you can do it, but remember...
What are the models of the outdoor unit and indoor heads? Do you have a cold climate or standard heat pump?
It's almost impossible to tell if a variable speed heat pump is under/over charged...
Also on the set and forget train. It'll adjust and just "maintain" at really low speeds instead of trying to recover from a big setback.
I'd think that you'd run into more issues when the SVZ isn't running and the 2 FS06 are running because they don't add up to the minimum BTU capacity of the condenser - 16K BTU in cooling and 27K BTU...
The Mitsubishi logic is to not run the electric heater if at all possible so the logic for running backup heat is this:
First stage backup -Room temperature 1.5°C below set temperature with less...
I would just bite the bullet and change both. That 1986 coil was built for R22, not the higher pressures of R410a.
At least it'll be easy to get to those white line sets when they start leaking.
If the indoor unit had plastic caps over the threads they're not charged with nitrogen. I don't think any of the GL line comes with nitro charge on the indoor units really. Did you use the flare...
Correct
I don't think that Carrier ever made a wifi version of the Edge thermostat, and it was probably installed because there weren't enough wires to put in a traditional heat pump dual fuel thermostat. ...
The offset only comes into play in heating mode, thus "heating height offset". It's logic built into the control board that can be turned off on some units. Not sure about Daikin, but your...
If you look back at post #7 where I explained the heating height offset it makes more sense considering that your units are installed 4' off the ground so your overshoot is going to be worse. Sounds...
I've probably got more questions than answers right now. 78° supply air is low, but then again so is 90° unless you're measuring it at a vent far from the furnace.
What size is the furnace? (model...
An 18K unit in a bedroom does sound a bit large. If it's a single zone system like you said then cutting jumpers to stop the fan isn't going to be any help. That's really just for stopping the fan...
A lot of mini split heads use some outdated logic for what Mitsubishi calls "heating height offset". They assume that where the head is located higher on the wall is going to be 3°C warmer than...
I'd have them come back and verify that the Belimo dampers are all the way open. I know they're two slightly different styles but I think the one in the last picture might be halfway closed. The...
I'd also go with a steam because you don't need to have the heat running to run the humidifier. Depending on what thermostat you chose it's a pretty easy setup to tell the system to energize a relay...