[pwrbotr]

High pressure is back in my salon AC. Wondering if I need to flush again or longer. Did it for 2 hrs. Could something else be creating the HP? Unit is about 18 or so months old. Thx.

 

[ocgrant]

Is the flow good now coming out the exit? Test it into a bucket.

 

[ttmott]

High pressure is back in my salon AC. Wondering if I need to flush again or longer. Did it for 2 hrs. Could something else be creating the HP? Unit is about 18 or so months old. Thx.

Dometic went through a rash of bad high pressure switches about that time. Actually, not bad but wrong pressure setting. Are you getting good water flow from the port side?

 

[pwrbotr]

Dometic went through a rash of bad high pressure switches about that time. Actually, not bad but wrong pressure setting. Are you getting good water flow from the port side?

yes getting good water exiting the boat but that also includes the port aft cabin ac. I’ll pull the discharge hose off the barn and check water flow from the salon ac discharge line into a bucket like @ocgrant suggested.

 

[ttmott]

yes getting good water exiting the boat but that also includes the port aft cabin ac. I’ll pull the discharge hose off the barn and check water flow from the salon ac discharge line into a bucket like @ocgrant suggested.

There are two AC units that use the port common drain - Solon and Aft Cabin. The forward cabin and bridge AC units use the starboard common drain. Most have issues with that forward cabin unit due to the long hose runs and as a result very low water flow to begin with let alone dealing with any restrictions.

 

[pwrbotr]

Well looks like water flow isn’t the issue so guessing it the switch.

 

[pwrbotr]

Spoke to my AC guy today. He thinks it might be the water temp in my marina basin causing the issue which clocked in at 92 degrees this weekend. Ever experienced this?

 

[ocgrant]

Spoke to my AC guy today. He thinks it might be the water temp in my marina basin causing the issue which clocked in at 92 degrees this weekend. Ever experienced this?

I call BS on that. How quick does it go HP? Have you hooked up a regular hose and tested it with tap water only to that unit?

 

[ttmott]

I call BS on that. How quick does it go HP? Have you hooked up a regular hose and tested it with tap water only to that unit?

I still say pressure switch. They are on the edge of tripping with 90 degree water like we have. Again, Dometic put the wrong switches on the newer refrigerant. The newer refrigerant operates at a higher pressure. I had to have the one on my 27K BTU unit changed and my dock neighbor had his changed also. We have a great service here and the owner knew exactly what was going on.
And BTW they are getting ready to change the technology again but this time with a flammable refrigerant for the sake of the "environment" and the units have leak detectors.....

 

[pwrbotr]

I call BS on that. How quick does it go HP? Have you hooked up a regular hose and tested it with tap water only to that unit?

I got about 24 hours with no issues. I have run it on tap water but not for hours on end. Runs fine on tap.

 

[ocgrant]

I got about 24 hours with no issues. I have run it on tap water but not for hours on end. Runs fine on tap.

So to go 24 hours with no issue then it happens makes me wonder about your pump. What pump are you using? I have seen those stock march magnetic pumps "slow their flow". Which might explain your issue. I think Tom can comment on that also as I think he upgraded his pump also. I upgraded to a oberdorfer pump which is a shaft driven pump at 24 gallons per minute Which refrigerant is your unit using? Tom may be 100% correct. I increased my head pressure with a larger pump and my units are still R22. I see well over 90 degree water in my slip but no issues. My buddy with a 410 unit experienced the same thing in the Abacos a couple years ago and the in the end the compressor just shit the bed. We put gauges on it and we saw the pressure climb and clearly the compressor just failed.

 

[pwrbotr]

So to go 24 hours with no issue then it happens makes me wonder about your pump. What pump are you using? I have seen those stock march magnetic pumps "slow their flow". Which might explain your issue. I think Tom can comment on that also as I think he upgraded his pump also. I upgraded to a oberdorfer pump which is a shaft driven pump at 24 gallons per minute Which refrigerant is your unit using? Tom may be 100% correct. I increased my head pressure with a larger pump and my units are still R22. I see well over 90 degree water in my slip but no issues. My buddy with a 410 unit experienced the same thing in the Abacos a couple years ago and the in the end the compressor just shit the bed. We put gauges on it and we saw the pressure climb and clearly the compressor just failed.

Thanks, Grant. This is helpful. I have some additional investigating to do and will report back.

 

[pwrbotr]

Anyone know the part number for the round anchor light on the roof of the bridge? Mine fell over in rough seas and I lost the lens. Fixture still works but need the 360 degree lens. Steaming light is still in tact and in working order. Thx.

 

[tshannoz]

I still say pressure switch. They are on the edge of tripping with 90 degree water like we have. Again, Dometic put the wrong switches on the newer refrigerant. The newer refrigerant operates at a higher pressure. I had to have the one on my 27K BTU unit changed and my dock neighbor had his changed also. We have a great service here and the owner knew exactly what was going on.
And BTW they are getting ready to change the technology again but this time with a flammable refrigerant for the sake of the "environment" and the units have leak detectors.....

Tom, what high pressure switch would you recommend for the 24k BTU bridge unit?

I suspect that HP is being triggered way too soon up there. I have investigated water flow and everything else, so the wrong HP switch makes sense.

 

[tshannoz]

Anyone know the part number for the round anchor light on the roof of the bridge? Mine fell over in rough seas and I lost the lens. Fixture still works but need the 360 degree lens. Steaming light is still in tact and in working order. Thx. View attachment 197080

I’m pretty sure it’s the white model (#40001-1) of this light:

Aqua Signal 40000-7 All-Round White Pedestal Navigation Light 12V 10W Series 40 *NEW*

Manufacturer: Aqua Signal MPN: 40000-7 Condition: New Additional Notes: Aqua Signal 40000-7 All-Round Pedestal Navigation Light **This is a new item with

maxmarineelectronics.com

 

[ttmott]

Tom, what high pressure switch would you recommend for the 24k BTU bridge unit?

View attachment 197146

I suspect that HP is being triggered way too soon up there. I have investigated water flow and everything else, so the wrong HP switch makes sense.

The refrigerant on that one is R22 which didn't have issues with the high head pressure switch. It is the 410 refrigerant units they (Dometic) installed the R22 switches on that is the issue. the 410 units operate at a higher head pressures. If that is the issue you are asking about. If you are tripping with the Hi Ps fault then one of three things - low raw water flow, air flow across the coil is restricted, or that switch is going bad.

 

[tshannoz]

Ok thanks for the explanation. For the 2nd potential reason, what is the best way to improve air flow across the coil? I haven’t tried this yet.

 

[Siboatguy]

Hey guys.. we are selling our 340 and making a move up to a 50 or 52... Looking into the fuel burn? Question is fuel burn 20gph on each engine or for both?? I'm curious what kinda range we can get on these.

 

[pwrbotr]

Hey guys.. we are selling our 340 and making a move up to a 50 or 52... Looking into the fuel burn? Question is fuel burn 20gph on each engine or for both?? I'm curious what kinda range we can get on these.

40g/hr total for both. Range is 270ish.

 

[pwrbotr]

View attachment 197147

View attachment 197148

I’m pretty sure it’s the white model (#40001-1) of this light:

Aqua Signal 40000-7 All-Round White Pedestal Navigation Light 12V 10W Series 40 *NEW*

Manufacturer: Aqua Signal MPN: 40000-7 Condition: New Additional Notes: Aqua Signal 40000-7 All-Round Pedestal Navigation Light **This is a new item with

maxmarineelectronics.com

Perfect, thank you!