Question about Carrier 38CKC042 Air Conditioner

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Match up Carrier equipment

I am in need of tect. support. I have Carrier 40RM007 indoor air handler with a cooling only R22 expantion valve and a Carrier outdoor heat pump 38UQZ007 that is 407C. My question is can I change the indoor expantion valve to a 407C heat pump expantion valve? If so what is the model number of that valve.

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  • Matt McElhenny
    Matt McElhenny May 11, 2010

    I have never heard of R407-C for a residential heat pump. Are you sure it's not R410a



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Carrier did sell some systems with R407c as a quick fix to gov regulations for about 2 yrs. R407c is a blend . and is treated like R410a except R407c pressures are more simular to R22. being that the pressures run the same the system should work with out changing any parts that being said if the evaporator has been used for R22 the oil residue wiil give you problems ifit is a new unit you would be ok.

Posted on Jan 10, 2009


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Related Questions:

1 Answer

Air conditioner fan is blowing but not air coming

If you mean that your OUTDOOR AIR CONDITIONER FAN MOTOR is blowing AND no air is coming out of the vents within your house, it clearly indicates to me that 1 of 2 things are wrong.

Either (1) your INDOOR AIR HANDLER is NOT running or (2) the INDOOR AIR HANDLER is running but your PLENUM has come apart.

If your INDOOR AIR HANDLER UNIT is NOT running, it could simply be the circuit breaker is OFF/TRIPPED and simply needs to be turned OFF; then turned ON. If that does not FIX your problem, then it is most likely your 5 micro-farad run capacitor for your indoor fan motor needs to be replaced. It will prevent your indoor fan motor from energizing. Worst case scenario would be your INDOOR FAN MOTOR has windings burnt and needs to be replaced. If your indoor air handling unit is equipped with a CONDENSATE VALVE CUT-OFF SWITCH, check to see if your drain pan is filled, thus energizing the switch. If the CONDENSATE VALVE CUT-OFF SWITCH is ENERGIZED, it will prevent the AIR HANDLER FROM energizing. That is the design and the reason for this valve.

Good luck.

Aug 26, 2014 | Heating & Cooling

2 Answers

How to evacuate system after installing air conditioner air handler?

The service valves are closed. Therfore once you solder to the stubs on the valves your gauges will read what is in the line set and evaporator coil. Pressure test to 150 and let sit. If determined your pressures held then evacuate with vacuum pump. You are evacuating the line set and evap coil only because your service valves are closed. THIS IS THE PROPER WAY TO DO THIS. Once evacuated to 500 microns, close manifold and open valves. You will then see your refrigerant charge and determine if more refrigerant is needed. Good Luck !!

Apr 10, 2017 | Heating & Cooling

1 Answer

I installed 18 seer heat pump&air handler with communicating stat,i turned power on to air handler,not heat pump,stat learned air handler&heaters properly.turned power on to heat pump,stat does not...

Dont know what equipment you have but yes of course there is a fix. Turn power off to air handler. cycle power to heat pump and be sure the board is configured properly to match your outdoor unit. Then turn power on to indoor unit and likely go through system setup once again. provide model numbers of all communicating components if more problems.

Dec 10, 2017 | Goodman Heating & Cooling

1 Answer

Can you put a 410a air handler with a r22 condensor

No. R22 and R410 are not compatible. R410 units operate at much higher pressures than a comparable R22 unit. These refrigerants also use different types of oil which are not compatible. If you need to replace half you might as well replace the whole unit because I was told that as of January 1 of this year you can no longer buy an entire R22 unit unless it is one a dealer still has in stock. They are phasing out R22.

May 19, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Compatability of a R22 air handler and a R410a heat pump

1. The units should match up without a problem.
2. You will need a 40 or 50 amp breaker for the A/H and 5 KW heat strip. You will probably need a 20 or 25 Amp for the condensing unit. I would check the FLA (full load amps) rating on both units, total them and install a breaker with no more than 20% more rating than the total. You can install a small box at the A/H with a breaker for the A/H and one for the condensing unit.

Nov 15, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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Outside compressor off while handler on inside, no cooling


Jun 20, 2009 | Heating & Cooling

1 Answer

RE: Heat Pump

it would sound likely the check valve assembly for the indoor coil isnt checking corectly . some units have orphis assembly and some have thermostatic expantion valves with check valve . eather way youll not be able to make repairs without correct equipment to open the sealed system and look for the problem . You will have to call in the experts im sorry to say. wish i could have helped more. please leave fead back. thanks

Oct 20, 2008 | Heating & Cooling

1 Answer

Goodman 3 1/2 ton unit

I work for a very large reputable goodman dealer. Your equipment appears to be a correct match. The correct orfice should have been taped to the outside of the outdoor unit in a baggie right beside where the pipes connect. Things will run alot smoother though if you scrap the orfice and have a TXV installed (thermal expansion valve) . This is a mechanical device that adjusts the flow of freon into the indoor coil based on the immediate needs of the coil. After that, balancing the refrigerant is a piece of cake as all we need is about 10 degrees of subcooling to make sure we have plenty of liquid to the TXV.

Jun 08, 2008 | Heating & Cooling

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