August Update: HVAC, UV, pump rebuilds, yet more RO/DI fun
Busy few weeks. Since the last update:
- Removed Hydro Wizard to mail off for service only to discover that mailing it off wasn't necessary
- Removed, cleaned, reinstalled 5 Tunze Streams and closed loop Abyzz pump
- Installed Skimmer wash down pump
- Wired up skimmer cup float switch, programmed Apex
- Tank temp spike to 86F, more losses in coral QT
- Upgraded fish room HVAC
- Installed UV filter on display tank
- Released round 3 of fish QT to display
- QT round 4 stocked
- Reworked Tunze power mountings
- Built 'advanced' kelp feeding solution
Hydro Wizard is bullet proof after all
The Hydro Wizard was one of the victims of the great soda ash overdose. After using pliers to force the impeller to turn a few times, was able to get the pump running in a pure vinegar solution for several hours to clean it. It initially seemed fine after reinstalling, but then started making a disturbing grinding noise about a day later. Since it is a sealed assembly with the only user-serviceable part being the propeller blade, I resigned myself to removing it from the system to mail back to the manufacturer for repair. Removing it was quite the production as it was installed before the cabinetry was built, and everything was either zip tied or run in cable channel from the controller mounted under the tank up to the pump.
I went straight to full removal because the timing was just too coincidental for it to be anything other than the soda ash incident. There was no way it could be a snail in the housing since I'd only seen a snail on it twice in 8 months of running and besides all of the snails are too big to fit through the slats of the shroud. You're probably guessing what I found after removing the pump and controller. Yep, so much for "no way". The skinniest cerith snail in the tank had almost managed to fit through the slats in the housing. He couldn't quite make it, but did get stuck with his long skinny end in just far enough to catch the prop and break one blade mostly off. The grinding noise was just the mostly detached prop blade flapping around whacking the snail.
In other words, no need to go through the full removal hassle. All I needed to have done was lift the pump out of the water to install a new impeller prop. And the moral of this story is: always check the simple stuff first, even if you "know" what the problem is. All the more annoying since I had learned this lesson several times over back in my programming days.
Installed skimmer wash down pump
As you may recall from an earlier post, the integrated wash down pump that came with the skimmer was defective. MRC had experienced too many failures of that pump model, so they sent a new BlueLine pump that required new plumbing bits and an adapter for mounting it to the skimmer body. With the new pump weighing substantially more and given that there is already a slow leak around the manifold box to which the old pump was mounted, I decided to floor mount the pump and do my own plumbing.
An open question from the last update on the wash down was whether it would spray only the inner neck or also clean the collection cup. It sprays the entire cup. Great in that everything gets clean; not so great in that it sends about 5gpm of system water straight to the sewer. Time to add supplemental dosing of NSW to the display. Fortunately, this should be fairly straightforward as only 17 of the 18 Liter Meter channels are in use.
Temperature spikes, junkyard cooling efforts, further coral loss
Getting the new HVAC spec'd, ordered, electrical prep work done, and HVAC installed took a couple of weeks. A few days in to the problem, I picked up a portable 1.2 ton AC to help bring temps under control while waiting for the new system. In the mean time, tank temperatures had risen to 87F. The fish seemed fine with this, but several more corals started bleaching.
The high tech appearance of the fish room took a decided turn for the disorderly with 4 fans and a hacked up portable AC install.
HVAC Upgrade
While upgrading capacity, decided to also add redundancy. The 3 air handlers in the room, plus 2 other zones, all ran off the same 4-ton split system condenser. I didn't love having a single point of failure in that condenser, but was somewhat okay with it for 2 reasons:
- It is a very common commercial split system with lots of emergency service options and good parts availability
- an identical split system condenser was spec'd for the media room and installed 1 foot away in the equipment building. In the event that parts were unavailable, the coolant lines for the aquarium and garage could be swapped over to the media system condenser temporarily.
But then in the course of the build, the condenser specs for media and fish diverged, so the option 2 quick swap possibility went away, further increasing my discomfort with the lack of redundancy. All of this lead to the decision to add a 7th condenser rather than upsize the existing fish room condenser.
Prior to the upgrade, aquarium HVAC consisted of one 1-ton air handler for the aquarium canopy, two 1/2 ton wall mounted units in the fish room, and a 1.5-ton dehumidifier. The upgrade replaced the 1/2 ton units with a 2-ton over the sump and a 1-ton over the QT tanks.
Installing the new system was nerve wracking as it involved routing new copper and electrical through and around all of the aquarium system wiring and plumbing. Access for the two wall units was especially problematic, with the 2-ton over the sump being the most worrisome given all of the high-leverage plumbing that could snap off a fitting or bulkhead with a relatively gentle nudge and unleash a 100gpm flood. To improve access I built a small platform to place on the sump, with rails underneath to keep load on the edges of the sump and off the think acrylic lids.
HVAC Before and After
UV Filter for Display Tank
Decided to add a UV to the display because algae is growing too quickly on the viewing panels. Also, the display started to turn slightly cloudy for a few days, making me paranoid that it might repeat the algae bloom from heck that plagued the coral QT a few months back. Initially thought to use the Emperor Aquatics 150W UV from the previous tank, but I could not find a way to make it fit in the fish room. I continue to be amazed by how cramped everything is in this fish room that I
thought during design would be nearly twice as big as necessary.
To get a footprint more manageable than the 6" diameter 6 foot long tube of the Emperor, went with an Aqua UV 114W unit. The UV is inline before the skimmer.
Because there are so many possible leak spots on this UV, have placed it on the floor next to the skimmer to run for a week where it is accessible for troubleshooting. After a week of trouble free operation, will mount it to the wall between the skimmer and RO/DI reservoir. Miracle of miracles, zero leaks on the first hookup. Of course it would have been an entirely different story if I'd started out mounting to the wall. . .
Temporary UV position
New Round of Fish for QT
Released the Chocolate Tang, Blue-eyed Kole Tang to the display. The Naso tang died in QT-- never ate. New batch of QT fish consists of a new Blond Naso Tang, 8 Yellow Tangs, Midas Blenny, Coral Beauty angel. Everyone is eating, the angel and blenny voraciously, all of the tangs somewhat indifferently, not yet taking pellets, only kelp and frozen mysis.
More RO/DI Woes
The booster pump on the RO/DI stopped boosting. It was running, but no change in water pressure. Disassembly revealed a plastic coupling which mates the motor to the pump head. This had wallowed out inside, and was no longer able to spin the head. SpectraPure was very quick to ship the new coupler, though still somewhat annoying that this was entirely due to poor assembly at the factory. When the filter first arrived I was surprised to see the pump head sagging downward. But it had just passed factory test and was working fine so I didn't give it further thought. Seeing the coupler, it was obvious that the pump head needed to mount flush with no sag. The root problem was that when first assembled, the upper braided hose in the image below was cut about 1/4" too long, forcing the pump head to bend downward. At least it was an easy fix.
Booster Pump Coupler. On the old coupler, the slot you see here was wallowed out to a perfect circle; couldn't even tell that that there had been a slot.
Booster Pump Before and After Fix: