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Old 04-30-2012, 06:53 AM   #11
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This post on one of the forums tells you how to check it if you can't find it in your AC documentation.

"Check to see if your AC thermostat has a delay built in. With the rig warm enough for the AC to come on, turn on the AC. If it comes on almost immediately, you need to jumper the PI EMS for the longer delay. If the AC doesn't come on for a minute or two, the shorter delay on the PI EMS is fine because the thermostat is doing that job."

The default setting on the EMS HW30C is 15 seconds. To change it, you have to remove the jumper (marked J8 on mine).

See this photo for the location of that jumper.

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Old 04-30-2012, 07:53 AM   #12
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Quahog, is that picture on your Jayflight thermostat?
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Old 04-30-2012, 10:14 AM   #13
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Please note the following updates:

PI-EMS and A/C Compressor Time Delay:

I spoke with a service tech at RV Products this morning, they are the manufacture of the Coleman Mach A/C's. I provided him with the technical data from the PI EMS installation instructions on the subject of A/C time delay, and his recommendation was to go with the EMS's 136 second time delay option (in lieu of the EMS default 15 seconds).

He stated that the Colman Mach time delay of 3 minutes resides within all Coleman Mach wall thermostats, not within the roof top A/C unit. He felt that the EMS would provide some time delay protection at the A/C compressor in the event that the wall thermostat had power (12VDC), but there was an electrical event (120V) taking place at the roof A/C unit itself. At least this was what I walked away with from the phone conversation.

Hunter Digital Thermostat upgrade:

The Coleman Mach representative confirmed that "all" Coleman Mach thermostats have a 3 minute time delay (digital or otherwise), but when I installed my EMS I didn't know if my upgraded "Hunter" digital thermostat had a time delay.

I dug out my Hunter documentation and did confirm that it does in fact have a 3.5 minute time delay after shutting off the cooling system before it can be restarted. The Hunter document went on to say that this time delay feature will prevent damage to the A/C compressor caused by rapid cycling.

IMPORTANT: The Hunter document also stated that the thermostat the time delay feature "does not prevent a rapid compressor restart due to a short power outages". I can only assume this is why the Coleman Mach tech recommended using the EMS 136 second time delay option.

Hope this helps

Bob
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Old 04-30-2012, 10:21 AM   #14
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Quote:
Originally Posted by norty1 View Post
Quahog, is that picture on your Jayflight thermostat?
That is the inside view of the EMS HW30C.
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Old 04-30-2012, 07:52 PM   #15
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Nice job and a mod that is very useful and could save you a lot of money.
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Old 04-30-2012, 08:45 PM   #16
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The portable and the hard wired versions have exactly the same specs and protect against the same things.
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Old 04-30-2012, 08:49 PM   #17
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Quote:
Originally Posted by edatlanta View Post
The portable and the hard wired versions have exactly the same specs and protect against the same things.
But, the portable is just one more thing to take out and put away.
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Old 04-30-2012, 09:36 PM   #18
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Nice installation Bob!
In the photo which shows the insides of the EMS, the blue disk items which are slightly larger than a quarter, are the surge protection. The square black device where you attached the shore power cord, is a solid state relay which does the disconnect and connect as called for by the EMS microprocessor.
Just one note that might be of interest on those decided between inside/outside -- the inside actually has a contactor -- basically the same one used in an A/C condenser unit. It does have a very slight hum. I don't think it is an issue, but some might not like the hum.

Personally I prefer the permanent install because it is nice and clean. Either one will give you the exact same protection - all personal preference..
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Old 05-01-2012, 06:22 AM   #19
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Just one note that might be of interest on those decided between inside/outside -- the inside actually has a contactor -- basically the same one used in an A/C condenser unit. It does have a very slight hum. I don't think it is an issue, but some might not like the hum.

Personally I prefer the permanent install because it is nice and clean. Either one will give you the exact same protection - all personal preference..
Okay on the contactor. From the picture, I thought it might have been a solid state relay. Contactors can be noisy and slow.
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Old 05-01-2012, 07:57 AM   #20
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As far as noise with mine, I can hear a slight "hum" when I'm up close to the unit with the wood access door opened, but with the access door closed I don't hear a thing.

Bob
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