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Old 06-28-2016, 06:46 PM   #1
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New Coleman Mach 15 Working properly?

98 32' Holiday Rambler Alumi-Lite

It had a carrier 15000 btu unit that worked really well. Keep trailer in low 70's in 110+ weather.

Old unit finally gave out and had it replaced with a Coleman Mach 15. Technician put thermostat on the outside wall.

During the night with lows about 85 temp is getting down below 70 with 58 coming out the vents but air never shuts off. During the day with 110 highs temps are getting up around 85 with 65 coming out vents.

Today around noon it was 106 outside and 78 inside and air would not go off with thermostat maxed out at 90.

Went up on roof late afternoon after air was running all day and there was no condensation at all.
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Old 06-28-2016, 11:33 PM   #2
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Just a few observations and thoughts.


Your old unit probably had a pure refrigerant, new one uses R-410A which is a blend and unfortunately maybe not quite as effective.


You didn't elaborate on the t-stat other than it is mounted in a different location?
Is it truly the t-stat or a controller with a thermistor somewhere else?
Depending on the insulation an outside wall might not be the best choice.
Where was the old one?
At least insure if there is a hole for the cable it's plugged with insulation.
"Today around noon it was 106 outside and 78 inside and air would not go off with thermostat maxed out at 90." If you mean thermometer readings?? big discrepancy. 78 inside at 106 ambient is not as bad as some.




Is it ducted? insure that the ducting transition to the unit is fully joined & sealed.


Unfortunately sounds like your old unit was ahead of the game, new one not so much.


Happy motoring.
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Old 06-29-2016, 12:26 AM   #3
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Originally Posted by MtnTrek View Post
Just a few observations and thoughts.


Your old unit probably had a pure refrigerant, new one uses R-410A which is a blend and unfortunately maybe not quite as effective.


You didn't elaborate on the t-stat other than it is mounted in a different location?
Is it truly the t-stat or a controller with a thermistor somewhere else?
Depending on the insulation an outside wall might not be the best choice.
Where was the old one?
At least insure if there is a hole for the cable it's plugged with insulation.
"Today around noon it was 106 outside and 78 inside and air would not go off with thermostat maxed out at 90." If you mean thermometer readings?? big discrepancy. 78 inside at 106 ambient is not as bad as some.




Is it ducted? insure that the ducting transition to the unit is fully joined & sealed.


Unfortunately sounds like your old unit was ahead of the game, new one not so much.


Happy motoring.

The old thermostat was in the unit before and was controlled by a wireless remote. The new has a external thermostat and is mounted on outside wall.

It is a ducted unit
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Old 06-29-2016, 01:05 AM   #4
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Yeah being in the return air flow would explain tracking temp closer.
You may need to compensate with setting higher offset at night, sounds like it runs full-tilt during the day.
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Old 06-29-2016, 12:53 PM   #5
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What about the lack of condensation?
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Old 06-29-2016, 03:26 PM   #6
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Hmm,
That could be a number of things.
Relative humidity being lower. Dew point of the controlled air and the evap. temp.
Manufacturers have gotten more creative on modern units. Expanding the plastic drain trays capacity, and routing the water to other places. Run a hot gas line through it, splashing it with the outdoor fan, airflow and re evaporating it.
Some of those Coleman's even have a reservoir and pump to a drain.
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Old 06-30-2016, 08:11 AM   #7
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I guess the thing that gets me is it's 78 "inside" and you turn the thermostat to 90 and it won't shut off.... Big thing to me is 78 inside and 106 outside !! Geez thats good !!! I would think your thermostat is reading outside wall temps since it won't shut off.... Our new Dometic 15 K got a workout a couple weeks ago. Can't compare temps but outside was high 90's and very high humidity with full sun on rv for several hours. It did fine, kept it comfortable, (no inside thermometer) just the thermostat , but the water was running off the roof... For about 30 minutes the fan kicked up on high, but all other times it was on low. So far we are happy.
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Old 07-24-2016, 08:17 AM   #8
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Just installed one of these to replace the Mach 3. 2005 Itasca 31', 15K btu ducted, onan 4kw.
It was a direct replacement of the former, just plug and play - oh, and cough up about $750!

The old unit had me fooled. It would blow slightly cold - 97 yesterday, 94 inside the coach, vents were blowing at about 78. And the very top of the coil would start to freeze over. After much googling about RV air I decided the unit was low on refrigerant. Last year I had spent much time disassembling it and cleaning the coils, and plenty of air volume was coming out of the ducting. Also added the quick-cool grill with the direct vents out the unit like the new RV's have.

Rather than mess around with a 12 year old unit I simply drove over to CampingWorld and got a new one.

The hardest part was getting it up on the roof - it's a 100lbs. I don't know about you guys, but this old geezer can't climb up a ladder with a hundred pounds of AC unit. Wifey helped me hoist it up on the house roof with a rope and then carried it over onto the coach. Yikes. A forklift would have been the ticket. LOL.

Hooking it up is simply to plug the wiring harness connector into the controller board, mount the controller board up inside the intake. Super easy. Just the 4 bolts hold the unit on the coach. I was actually surprised how simple the install is. Of course CampingWorld wants some $150 to do this.

It brought the inside temp from 94 to 78 in a couple of hours and shut off.
Started out at about 67 at the duct vents, by the end it was blowing about 47.

This thing ROCKS!!
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Old 08-02-2016, 05:29 PM   #9
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The thermostat should NEVER be mounted on an outside wall. If you cannot move it, remove the cover and remove the two mounting screws. Reinstall the thermostat with rubber or plastic washers between the wall and the t'stat. Stand it off the wall about 1/8" as a minimum.

As for the R410 and other blended refrigerants, they work every bit as well as the older pure or azetrope refrigerants in a newer unit designed for the refrigerants. This has developed into a wives tale, back from the days of converting older u nits to operate on the new blends. I know since I worked in the industry since 1970 and saw all of the changes.

Ken
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