Chuck Phelan's Heating and Cooling

Chuck Phelan's Heating and Cooling
HVAC tools,jobs and parts.

Monday, December 12, 2011

Rheem RQNJ package heat pump

I received a no heat call about a unit running and no heat. What I found was the compressor would start then kick out on high internal temperature limit by its internal pressure relief valve. These units don’t have the low voltage high pressure switch that most people are familiar with. I suspected low airflow but what I found was a bad TXV.

When I opened the unit top I found the insulation liner sucked into and around the blower.

Loose_insulation

 

I then removed the insulation and ran the blower to see if that was the cause. No luck, still kicking out on the IPR. It would run up to about 385 then kick out. (R-22 system).I also removed the top of the return plenum so that there would be no back pressure from the return duct and filter on the blower except for the evaporator coil (more later on the filter).    Gauge just before hitting the max pressure

Hi_Pressure

 

While I was running the unit and watching the pressure gage I couldn’t help notice the condensing fan motor was flexing its mount on the grill as it spun at 1075 rpm’s. After a closer look I noticed that the metal was cracked and would be spinning its way into the outdoor coil sometime soon.The fan blade and grill were replaced.

RQNJ_Grill

I then reclaimed the r-22 and replaced the txv. The pin inside the txv had stuck and would not shift. After I took it apart I found some black looking type of varnish material. The unit does not have a drier installed from the factory or this would not have happened. The unit was also severely overcharged by 4 lbs.

Here is the stuck pin.

RQNJ_Sporlan_Pin

You get what you pay for with this unit. On a scale of 1-10 I would give it a 4. The 4 ton can deliver 1800 cfm @0.50” SP.

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