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If my line-set is undersized what problems could this cause?

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Many you can freeze up the evaporator coil lose effieceny and hurt the compressor plus your not getting what u paid for

Posted on Sep 10, 2010

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Noma a/c cq120 makes noise in compressor area and casing is hot to touch. Is compressor going? Is it worth to repair or buy new. I'm guessing this unit is 4 years old or more

Possible Causes There are several reasons for a compressor to run too hot, including high compression ratio, high return gas temperatures, and lack of external cooling.High compression ratios are the result of either lower than normal suction pressures or higher than normal discharge pressures. Changes in suction pressure will affect the compression ratio more rapidly than changes in the discharge pressure. For this reason, it is important to keep the suction pressure at its highest possible value.
Causes of low suction pressure can include incorrect sizing of components, misadjusted or defective metering devices (TXVs), loss of refrigerant charge, plugged driers or strainers, and excessive suction line pressure drop.
Although not as sensitive to change as the suction pressure, the discharge pressure can still greatly affect the compression ratio. Keeping the discharge pressure within normal operating conditions is still important.
Causes of high discharge pressure can include dirty condensing coils, undersized discharge line, a blockage or recirculation of condenser air, erratic condenser fan operation, refrigerant overcharge, noncondensibles in the system, and an undersized condenser.
Many larger refrigeration systems with electronic controllers will automatically monitor the temperature of the discharge line and will send out an alarm to alert the owner or service contractor of a potential problem. Regardless of how the discharge line temperature is monitored, it should always be checked as part of any service to a refrigeration system.
A technician should also check the discharge line temperature within 6 inches from the outlet of the compressor. Any temperature above 225 degrees should be investigated and the cause found and repaired.

Jul 26, 2017 | Refrigerators

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If thermostat is set at 70 and room only gets to 65 will increasing the setting on the thermostat make any difference?

Set an undersized heater thermostat to any temperature you want - if undersized, it will not be able to get to the set temp if it's cold ...

Feb 17, 2015 | Heating & Cooling

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Recently installed a Noritz NRCP 112 water heater, but very frequently it keeps shutting off and on the display it says error 60, after looking at the manual there is no explanation of what error 60 is....

Shut downs with new heater might be defective PC board.
Other issues could be associated with improper installation.
Low gas pressure caused by undersized gas meter or water in the gas line, undersized gas line to unit (requires 1" gas line to within 10 feet and then 3/4"), wrong type of gas line (cannot use flexible gas line), improper vent (for example too long horizontal run or undersized vent pipe or shared vent with furnace or other gas appliance), not enough incoming fresh air supply, nearby exhaust fans or vent fans stopping proper draft on tankless, temperature set too high for cold incoming water supply (install tempering tank to help preheat water),..

Other causes can be clogged water filter located where cold water enters tankless, or clogged water line, or crossover caused by bad single-handled faucet or bad crossover valve on recirculation system, improperly sized recirculation system. These problems can mean less water flow through tankless, so burner shuts down, and unit throws error code because sensor indicates water flow is still moving but inadequate to trigger burner

Water Heater Timers Save Money

Nov 27, 2014 | Water Heaters

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Suction line size on midea minisplit heat pump is 1/2" suppose to be 3/8" what problems will that cause?

An undersize suction line decreases the capacity, and causes the compressor to work harder and more frequent starts. It may even experience low suction pressure and high superheat.

Dec 16, 2013 | Midea 18,000 Btu 17 SEER Inverter Mini...

1 Answer

High-pitched squeal when heater comes on.

a high pitched whistle is a gasflow problem. usually caused by the techs who installed the heater who didnt ensure proper gas pressure supplying that heater. undersized gas line, or gas meter too small

Jun 26, 2013 | Sta Rite 333 Btu Natural Gas Heater...

2 Answers

We have a new Amana 16 Seer Heat Pump chpf4860d6da and every time the unit turns on the house lights dim for a split second. We had the electrician and local power company check the incoming lines and...

I think you hit the nail on the head. The undersized (to light a gauge) wiring would cause that problem. In most cases it should be at least a 4 or 6 gauge wire. AC Units pull a lot of power in their start up or peak cycle. Hence, the need for the proper wiring.

Apr 01, 2011 | Amana PTH123B25AJ Heat Pump Air...

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Pump comes on--the water stopped coming out---noticed the 2 wires coming from the pump hooked to points are black at end----top of pump got warm----have had a lot of lighting in my area---3/4 pump

Likely two very separate problems:

Prime failure is either mechanical wear in the pump or an air leak in the suction line. It is usually easier to look for air leaks in the suction prior to disassembling the pump to look for trouble. A clogged foot valve, a clogged impeller, clogged inlet screens, etc.

Line leads discoloring can mean many things: Line voltage may be dropping too much and/or the line leads undersized. The motor may be beginning to fail causing an increase in amp draw. The pump may be overloaded but that is unlikely.

As you narrow down the possibilities please add comments to this post if you need additional guidance.


Sep 12, 2010 | Sta Rite Ds3hf 1.50 Hp Self Priming...

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Water is not despensing

Try these:
  1. Check the water dispenser arm. It must have some resisting force when pushed or pulled. Otherwise it is defective, then replace it.
  2. Check the water line and water inlet valve for clogging. It can cause poor water flow, undersized ice cubes and overfilling. Replace if found defective.
Note: The ice and water dispensing system of your refrigerator is complex. Aside from simple problem of a leaky water tube or a jammed ice chute, most other components are not user serviceable. Service of a qualified appliance repair technician is suggested for such repairs.

Aug 31, 2009 | Whirlpool Refrigerators

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