york hvac flooding back - http://www.hvacmechanic.com/ Forums

Original message

moosejuice

205.56.162.42

"york hvac flooding back" , posted Tue 8 Jun 15:15

The evaporator and the condensing units are brand new but it is flooding back and causing the suction strainer and the suction line to frost up. The unit is also tripping off on the low suction pressure safety and will not start again until it is reset. According to the manual that came with the units the refrigerant charge is correct. I thought that maybe the txv was misadjusted but it is not the adjustable kind. Any Ideas of what I should check next?

Replies:

rick (DFW)

205.246.136.134

"Re(1):york hvac flooding back" , posted Wed 9 Jun 16:15

By suction strainer, I assume you mean "suction drier". If only the Drier and the suction line going from the drier to the condensing unit are frosted up, then I would suspect a stopped up suction drier. This would also explain tripping the LP switch. However, if the suction line is frosting back long before it reaches the suction drier, I would have to say you have an airflow problem,a problem with the TXV, or the unit is not cycling off as it should.You may want to see if the coil itself is frozen up.

yusuf_GOME

212.71.37.75

"Re(2):york hvac flooding back" , posted Fri 8 Feb 11:41

check exv ton may be over size exv or suction air restrecation open suction panel and check pressure

ALLAH IS GREAT

xenos
Webmaster

67.70.16.52

"Re(1):york hvac flooding back" , posted Tue 8 Jun 18:01

If you don;t have any supper heat I would think it's the TXV my self.

Xenos.

The best way to escape a problem is to solve it.

TechMaster

24.73.11.62

"Re(1):york hvac flooding back" , posted Tue 8 Jun 16:47:

This seems like an airflow problem. Check returns, filter, belt if any, coil surface, proper blower speed and rotation. Make sure there are no dampers shut, even fire dampers in the return.

Keep Cool!

[this message was edited by TechMaster on Tue 8 Jun 16:51]

TexasTech

205.188.116.203

"Re(2):york hvac flooding back" , posted Tue 8 Jun 18:50

Something is not adding up here. You said the refrigerant charge is correct but it trips out on low pressure safety? I think we need better facts before proceeding.