As posted in previous threads, I'm replacing my home dual fuel heat pump system with a geothermal set, and have been working with an HVAC vendor that has really been fantastic for us over the years, but doesn't really have much recent geothermal experience. After a few weeks of questions and discussions about sizing, equipment, loops, etc, we now have our loops installed, and are ready to do the installation of the inside equipment.
Quick Overview:
3 systems being installed
Downstairs (5-ton TT064 Packaged Unit with 15Kw heat strip and a desuperheater).... Separate loop is 3 vertical boreholes at 300 feet each, and a dual pump flow controller.
Upstairs front (2 ton TT026 split unit with 10Kw heat strip).... Separate loop is 2 vertical bores at 250 feet each, and a single pump flow controller.
Upstairs back (2 ton TT026 split unit with 10Kw heat strip).... Separate loop is 2 vertical bores at 250 feet each, and a single pump flow controller.
Today, at least one of our three systems arrived (a Climatemaster TT064 for our downstairs).
I honestly feel bad for the installer, but am also concerned as the homeowner, in that this is really new to them, and it seemed like some basic questions came up that I'd really like to get some help in terms of pointers or directions to look for information.
I am hoping that this community has some willing Climatemaster experienced folks that can give us some brief answers, or leads to getting things installed. (It rapidly is becomming a crisis for us, as our downstairs 5-ton unit is now disconnected and its 90 degrees outside this week!)
The issues I'd like thoughts on initially are:
1. Wiring connections for HIgh-Voltage (208V)
The TT064 is a vertical unit, and the Electric Strip heater is mounted at the top of the unit (I assume that this is the supply side).
It appears to require a separate High-Voltage line (separate breaker), and has low-voltage connected down to the unit.
They are also mounting the dual pump flow controller near the TT064 and are trying to figure out the wiring for that.
Question: Do these units require separate 208V runs for the Heat Strip, the packaged unit itself/compressor and fan, AND separate for the pump/flow-controller?
Do they need separate breakers in the panel, Or is it normal to run a single line to the Packaged Unit (60A breaker) #6/#8.... and connections made from the Packaged unit to the strip and pumps?
On the power supply panel in the unit near the base, there are power lugs for the HWG, but it does not appear to have any additional connectors for follow-on things like the Loop pumps or heat strips.
However, there are two breakers in the unit marked something like Loop breakers! if so, is there somewhere that they missed in finding where to connect the power to take over to the loop pump?
Is there easy to read documentation somewhere on the wiring setup for this system? We downloaded the documents on the website, and have the manuals included in the box, but even with me reading along side them, it was clear that we were all missing something that is likely very easy to answer.
2. Loop Flow controller related.
For a closed loop vertical bore system, do we need an expansion tank or any additional valves on this type of system? The well driller (vertical closed loop system) asked about an expansion tank install, and the hvac guys said that they don't think one is needed.... So, should the loops go straight into the Flow Controller without the tank? then, on the side between the pumps and the HP, is there any need for additional valves or expansion tank? It appears that the flow controller has a manual turn-style mechanism to block flow, direct flow, flush, etc..... thoughts?
I'm sure there will be numerous other questions, and I'm thankful to anyone that can either guide us a little, or offer assurances that things are correct (or jabs if they are wrong too :-) )
thanks in advance.