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I have a greenhouse with two window air conditioners mounted one on top of the other. I attached a max/min recording thermometer to the outlet vanes of each. These are the readings over the past 24 hours:
Current RH 84%
High RH 99%
Low RH 79%
Current Temp 50F
High Temp 61F
Low Temp 48F
Current RH 99%
Low RH 80%
Current Temp 63F
High Temp 66F
Low Temp 61F
The actual temperature range over the past 24 hours was probably 61F - 86F.
At the time I recorded this info, the outside air temp was probably 63F.
Does the second unit have a problem? Any idea what is wrong? Thanks.
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The unit is made by Zamil which is made in Saudi Arabia. I don't believe they are sold in the US. Do you have access to Zamil info? Thanks.
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I just got home from work and checked the temperatures. The "bad" unit is currently blowing 52F air.
Why would it sometimes blow ambient temperature air?
It seems like it blows ambient at night and cools during the day. This may be my imagination. I'll continue to watch it to see if this trend continues.
Yep. Typical 1.5 ton window ac unit...
Nope. Coil was clean and it still isn't cooling. I'm puzzled because sometimes it blows 50F air and other times it just blows ambient air with 99% humidity. What would cause that? The other unit blows 50F continually.
How can I tell?
Info for you (or whoever picks this question up).
I don't think the compressor is running because this unit is practically silent when powered up compared to the "good" one.
Would the fan run if one if there was a problem with one leg of the 220?
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I have verified that the 220v to each unit is ok.
Yes, I am still interested in help from an expert.
Some of the info I provided may not have been correct.
Yesterday I moved my 2 recording thermometers. One is now mounted to the outlet vanes of the AC and the other is now outside the greenhouse.
Over the past 24 hours the outside temperature has been 61-85F with 40-81% RH and the AC output air has been 50F-66F with 66-99% RH.
Does it sound like this AC is functioning properly? Should the output be colder?
The reason I am suspicious is that the other AC unit puts out 50-55F air while this one is putting out 65F.
I want to be able to maintain my greenhouse below 90F this coming summer when the outside air is 120F.
The greenhouse is 36'L x 12'W x 7'H and the 2 window AC units are each 1.5 tons. The roof is clear vinyl .012" thick and almost horizontal. It is covered in dust/sand so it does not let all of the sun through. Does it seem possible that I can keep it below 90F?
Yes, both units were on high the whole time.
Not sure if the thermostat is mechanical. It has a long crimped copper tube mounted in front of the coil. I could easily bypass it if that would help you diagnose.
I have a digital multimeter but not a clamp-on ammeter. I'm not afraid to poke around inside the unit to get readings.
The thermostat had 4 wires.
Red - ?
Orange - ?
Yellow - to the capacitor
Brown - one leg of 220
The wiring diagram is too faded to read.
Which do I connect to bypass the thermostat?
I checked the voltage at the 3 wires on the compressor while the fan was running and the switch was on high cool. The compressor was not running.
The voltage was:
What does this tell us?