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Re: janitrol inside unit
Do you have a digital t-stat?
If so does t-stat have batteries? bad batteries will give you problems.
Check you electrical breakers. Turn them off then back on to reset.
Does the fan come on if you set the t-stat to fan on?
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You need to find out if your drain has an out let outside and vacuum it out with a wet/dry vac. Otherwise you will have to cut the drain line inside and vacuum it out there, The ac supply houses sell a twist and turn clean-out tee that makes it easier to clean your drains.
If the blower is working with the thermostat in the ON position that tells you that the fan motor works. In the AUTO setting... the system in controlled by the contacts in the thermostat.
1. The thermostat contacts might not be closing.
2. A contactor( or relay ) in the air handler unit(inside unit) might not be closing to send the signal to the fan motor.
It sounds like a thermostat or relay problem to me. You can email me at Starztruck4u@aol.com if you have more questions.
First off - the 'rule of thumb' is 600' per ton of Air Conditioning. In other words your old unit is a 2 ton unit. So - 2 tons x 600' = 1200'. As you can see if you install the 2.5 ton unit - you will be installing a AC that 'could' cool a 1500 sq ft house (2.5 x 600' =1500 sq ft.). Slightly more than what you need; and the 3.5 ton unit is 'way to big,' (3.5 x 600' = 2100 sq ft.).
Note: fyi - many in the AC business will sometimes refer to tonnage in btu's, i.e. 1 ton = 12000 btu - hence a '2 ton unit' can also be referred to as a 24000 btu unit and vice versa.
So... from the above - you can easily see that "2 tons" of Air conditioning is what is required to cool the 'average' home of 1100 sq ft. "roughly speaking."
Note: it is always best to have a professional 'size' your cooling/heating needs.
One of your questions was could you 'mix tonnage?'
The answer is 'usually you don't mix the tonnage of your outside/inside units.' However, professionals sometimes do (mix the tonnage) in certain situations, and installing a 2.5 ton outside unit with an existing 2 ton inside unit is often done, however, there are some 'tech issues' here and - I would "again" recommend that you call a Service Tech to help you with the sizing/mixing of your cooling/heating needs.
Start the unit and go outside to see if the insulated pipe is sweating or cold, hot air should be discharging from top of outside unit. Since the breaker is not tripping, my best guess is the compressor is not operating. You might have to replace the capacitor.
If you can hear the compressor operating, then most
likely needs refrigerant
Does the outdoor fan run? If not then start by checking for tripped circuit breakers or blown fuses. If you have power then check the capacitor. If that is good then check your contactor for the fan and compressor. If that is good then check the compressor motor windings. Let me know if you have any questions.
i would get someone to check your refrigerant levels have you ever had the evaporator coil flushed and cleaned? proper refrigerant levels and proper airflow across coils are extremley important not to scare you but 18 yrs is a long time on a heat pump 9-12 years is the point where they really loose there efficiency going for a newer one would probably cut your operating cost in half if not more depending where you live there are a lot of people not familiar with heat pumps so i suggest finding a company that specializes in them to service your unit
Did your unit work last summer? 10 Years old is very soon unless it is a cheap unit like janitrol or goodman. Most units last min. 15 years and 20 most of the time. Generally speaking any ways. To replace compressor cost maybe 750.00 to 1,000.00 you have a big house looks like. 5 Ton unit. The whole system could be 6000.00 to 8000.00 depending on grade of unit. I would get a second opinion though cause I am wondering if they are just padding their pocket.
There should be electric heat strips in the airhandler.
They automatically come on when the unit goes into defrost, the thermostat is turned up more than 7 degrees over the indoor temp or if the outdoor temp is just so cold the HP cannot keep up.
Tat is your auxillary or emergency heat.
What does the new t-stats installers booklet say that the 0170 function and #2 #7 options are for?
If it is for gas vs elec heat then set it on the elec option.
The difference is that in gas heat systems the blower comes on a few min AFTER the furnace fires up to allow the heat exchanger to get hot.
In an electric furnace the blower has to come on emediatly because the heat strips get hot emediatly and if the blower is delayed the system will shut of in high temp overload.