Water Furnace Premiere Hi Pressure
Last Post 02 Sep 2014 10:32 PM by engineer. 6 Replies.
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HotrodjohnUser is Offline
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24 Aug 2014 01:27 PM
Ive got a Water Furnace Premiere At that has high pressure fault warning, I reset, Put the gauges on it and it had normal numbers , 250 hi, 90 low in 95 degree ambient temp. Ran for a while with these numbers and faulted again. Water flow appears fine as there are two units in the loop and the other one works fine, plus, because it is cutting off so quick from a cold start there is no way a water flow issue would allow the pressure to get high enough. Im thinking the switch is just bad. Is there anything else that physically trips that fault light or is it purely based the compressor pressure.?
G.O. JoeUser is Offline
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24 Aug 2014 04:36 PM
High pressure switch only. All waterside diagnosis should be done before putting gauges on. You need to check DeltaP of the water coil to make sure it is not a water flow issue (scaled coax, water short circuit w/ stuck check valve, etc.). The fact that the other unit is working does not necessarily mean you have good flow at the troubled unit. If it is the switch WF has retro replacements that attach to the hi side service port. If you still have gauges attached anyway and if you are qualified (POWER OFF PLEASE ) jumper across the black wires to high pressure switch. If she runs and pressures are good it would be the switch. If not check those wire connections to the control board.
What is your EWT and LWT so I can look up appropriate pressures?
HotrodjohnUser is Offline
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25 Aug 2014 11:15 PM
It was a bad connection on the high pressure switch, it looked attached normally but the copper had actually broken and the connector was held in by the insulation only. I guess the vibration over years did this. Its working fine now. I wouldve sworn that was closed TXV by what it was doing. Apparently, the connection was working for a few seconds with the connector barely contacting. .. I didnt measure the water temps, keep forgetting that is the appropriate mesure as opposed to air source. It seems the last time I measured the EWT it was around 85 .
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26 Aug 2014 07:08 AM
I'm happy to hear it was a simple fix. WF published typical pressure ranges for Premier at 90f EWT in cooling are (Suction:78-88psi) (Discharge:220-260psi). The use of gauges is generally discouraged unless a thorough diagnosis points to the refrigerant system. This case shows that it was a waste of effort when your attention should be directed toward simple solutions to a hi pressure "fault". Packaged units have a relatively small refrigerant charge. Repeated gauge attachment will reduce unit charge. I don't put gauges on unless I am fully prepared to reclaim, evacuate and recharge; just in case.
engineerUser is Offline
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29 Aug 2014 10:36 PM
I agree that given the ease of assessing performance via heat extracted / heat rejection calculations attaching a gauge manifold should be held in reserve.

However don't be afraid to use a manifold if conditions indicate. If you MUST attach a manifold, at minimum carefully purge the manifold and all hoses, and use a ball valve on the high side hose end so that the entire manifold / hose set can be reduced to low side pressure before being detached. That way very little oil and liquid refrigerant is vented.

Curt Kinder <br><br>

The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
ACES-EnergyUser is Offline
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30 Aug 2014 01:41 PM
We use just gauges without a line-set for standard troubleshooting. If refrigeration work is required, all my guys equipment have gauge sets with the shortest lines available.
www.ACES-Energy.com
engineerUser is Offline
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02 Sep 2014 10:32 PM
Hose length is less important than ensuring hoses have only gas, no liquid refrigerant in them when detached from system.
Curt Kinder <br><br>

The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
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