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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Air conditioner fan is blowing but not air coming


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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.

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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

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