## Specs [[Owners-Manual-Oceanaire-OWC.pdf|Manual]] Model Number: OWC-2412 Serial No: R1-30654 Charge: R410A > [!Photos]+ Schematics/Interior ![[Screen Shot 2022-07-27 at 12.02.39 PM.jpg|grid]]![[Screen Shot 2022-07-27 at 12.03.59 PM.jpg|grid]]![[Screen Shot 2022-07-27 at 12.04.44 PM.jpg|grid]] ## Excessive Impact On Acoustic Environment ![[3883C4AD-13C9-4F43-A8EA-0620053AF52E_1_102_o 1.jpeg]] ## “CON” message flashing on screen CON = condenser over pressure tripped This overpressure is usually the result of the condenser coil not being cooled, and per the [[ideal gas law]], the temp not dropping meant the gas exiting the condenser was not a low enough pressure. ### how to reset To rest, there is a red ==recessed== push button on the back of the unit, located above the water in connector. Press this button. ## Maintenance Log - [[2023-07-28]] - Came in and unit was flashing "con" - See [[S&A CW-6300BN240H 2.3 ton water chiller]] as the problem was a low water level alarm in the chiller - [[2022-07-27]] - Grace arrived and tried to turn on AC unit. She went through normal startup, but AC flashed “CON” on its display - “CON” is flashed when the condenser is overheated. This is usually the result of the water chiller being off while the AC is running, Nand there thus being no water flow through the condenser coil. - On the back of the unit there is a red “condenser reset” switch. It’s not labeled as such though - ==Corrective action== - Best thing to do here would be to [[interlock]] the chiller to the AC unit bi-directionally - What I can do today though is embed some more information into the chiller itself, providing instructions on how to reset. - [[2022-07-21]] - Observed several issues with chiller as we approached minimum cooling load. - First noticed a water hammer problem due to insufficient deadband on the condenser cooling water valve. - Fixed this by raising the set point temp, preventing the unit from operating in the range where the water hammer problem was present. - Raised set point caused compressor cycling. This meant that the water valve would close completely, causing a low flow alarm on the [[S&A CW-6300BN240H 2.3 ton water chiller]], and thus the chiller to enter into and out of an anti-freeze compressor shutdown. - Video describing problem, and of the water hammer is in the shared shop album - Proposed fix: open the condenser water valve fully. - This would drastically increase the water usage if we were running city water, but on a closed loop chiller system this is preferred. Especially when there are no other loads on the cooling circuit. - This will reduce the temp of the gas coming out of the condenser. - This should be ok as its basically the same thing as running a unit on a colder day - Possibility of tripping a low pressure alarm as this unit might be critically sized with little room for changes in load. However, the units wide output temp range would suggest otherwise. That wide range of load conditions on one side of the system should result in a wide operating regime on the other. - The repair - Grace opened back of unit using impact driver - Water valve (Johnson Controls V246GA1-001): - ![[IMG_7263.jpg|300]] - The spring was depressed about 1/4" by the adjustment nut - I backed it out as far as it would go - Grace closed back of unit - After restart, water flow went from ~8 lpm to 16 lpm, indicating adjustment successful - Unit now can run at a much lower set-point without the water hammer problem. ## Specs - ## Manual ![[OA-EISM-OWC2412QC-01012022.pdf]]