Baja Man wrote:
I would like to add two 90mm fans behind the service vent (side of trailer). This is the lower vent where most of the electrical connections are located.
MY current unit Dometic DM2652LBX with one fan near top that is thermostatically controlled.
The current installation appears the best/correct I have ever seen in my last 4 trailers/motorhomes (Jayco, ORV, Monaco, MPV Toyhauler). By correct I mean...proper space all around refer (especially behind refer), and a fan near top that sucks hot air through coils and out of top vent. All other units had twice the all around space of this one and no fan near top.
I have added fans on other trailers (mid area behind refer) but I want to do something a little different this time to perhaps increase cooling efficiency.
Current temps:
Direct sun, ambient temps 77F-83F, refer empty
Wireless thermometer
Refer/Freezer: 38F/7F (77F-11:20am); 42F/8F (81F-2:00PM); 45F/9F (83F-3:00pm)
MY Plan:
Add two 90mm fans behind lower side vent. My thoughts are to add these two fans directed to blow air upwards(sucking fresh air from outside vent)and having the upper fan suck it out at same time. I would like for all three fans to work synchronously (all three on at same time).
I can not see where the current fan thermostat is located.
My questions:
1. How can the three fans be wired together?
2. Can all three fans be controlled from the one thermostat to ensure they are all three activated at the same time. How can I accomplish this?
3. I would also like all three to be controlled manually in addition to thermostat. I am thinking a three way toggle switch (SPDT, DPDT, ?) How can I best accomplish this?
I am unable to access upper fan, thermostat, and wiring as I do not want to remove the refer.
Thanks!
in response to your questions
1) wire the fans in parallel, each of them connected to +12V and ground
2) yes all three can connect to the same thermostat. Just connect the thermostat in and out to each fan just like you would do if you only have one fan
3) Do you want to just turn all three on or all three off at the same time? Do you also want to bypass the thermostat? Or do you want to turn all three on independently?
Need more info on how best to accomplish (3)
