WSHP issue

[RustyShakleford]

Today I worked on a mcquay water source heat pump that was tripped on high head upon my arrival. Standing pressures were in an acceptable range so I reset the the unit. The unit kicked on immediately and ran fine with normal pressures and amp draws and TD across coil. After running fine for 10 minutes the head pressure spikes to past 350 and trips off on high head. Unit has a cap tube and low SH. The property manager said that the unit has never really worked properly since it was installed. I figured that there was a restriction in the water lines, but when I checked the strainers they were clean. Also acceptable delta T on the water. Could it be a bad reversing valve? Doesn't make sense how everything runs steady for more than 10 minutes and then boom, head pressure is through the roof. Any ideas?

[grkmano]

What was your suction pressure?? What kind of freon we talking about? Where you running in heating or cooling?

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[grkmano]

And a model number would be good.

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[manny238]

cool or heat mode? you have any pressure readings?

[RustyShakleford]

60psig suction and 250psig head while running in cooling mode. This particular unit is never used for heating. I do not have a model number. R22

[Nuclrchiller]

"Acceptable delta T on the water" is kinda vague. What are entering and leaving water temps? Both immediately after startup and when unit trips.

[toocoolforschool]

sounds like --- restriction, but I am preaching to the chior.

[RustyShakleford]

Water in is 68 and water out is 81

[BaldLoonie]

Even if they don't use it in heat mode, what happens if you run it in such. Sames as in cool and spikes? Might be worth trying.

[grkmano]

Maybe your water reg valve acting up??? Also double check your temp across filter dryer.

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[manny238]

Yeah I agree with grkmano. If u have a control valve for your condenser water it might be closing on you. Also need to check your circuit setter if u have one to make sure it's not restricting your water flow. You might have a liquid line restriction somewhere. Good
Luck buddy.

[ncboston]

Is this the type that uses a thermistor to control the expansion valve?

[grkmano]

Is this the type that uses a thermistor to control the expansion valve?

He said it was a cap tube system... so has to do either filter dryer or water reg.

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