Original message
| KnightOfTheBass
|  "Jim Johnson Troubleshooting"
, posted Mon 4 Feb 12:09  
Every Month a man named Jim Johnson Writes a troubleshooting problem for the magizine "Indoor Comfort".
(for info on indoor comfort see www.IHACI.org )
If you send in the correct answere Jim Johnson will send you Prize, which is usually his own instructional DVDs and CDs.
Here is Troubleshooting Feburay 2008
A HEAT PUMP THAT'S NOT BLOWING COOL AIR
by Jim Johnson
Contributing Editor
Sure, it's still winter, but soon it will be spring, and that means it's OK for us to begin looking into some problems with units that are supposed to be cooling, but aren't. In this case, we're dealing with a situation in which the out door temperature is near 80-degrees, so we're depending on our split-system heat pump unit to cool the home, but it isn't. The customer's description of the problem is that the "unit is running, but it isn't cooling right."
When you arrive you are able to confirm several factors among them:
The outdoor unit is sitting dead even though the thermostat is set to the cooling mode.
The fan switch on the thermostat is set to the "auto" position, and the indoor fan motor is running.
When you use your volmeter to begin troubleshooting, you find(refer to the wiring diagram in figure 1):
240-volts at L1 and L2.
24-volts at the C and Y connetions at the outdoor unit.
0-volts at CC
24-volts at The CHP
Your two-part troubleshooting question:
What is the next step to take in troubleshooting this situbation? (Hint: don't think too hard about this question, it ain't rocket science-JJ)
What are two possible causes of the conditions you found in assesing this unit?
CC is a contactor between L2 and T2
CHP is a control, high-pressure
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Replies:
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| gigihurt
| "Re(1):Jim Johnson Troubleshooting" , posted Wed 30 Apr 12:04
Out on high pressure should have 0 volts at high pressure switch.
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