Surprised How Loud Our Coleman Mach AC is...
Hi All, Inside our RV, the sound from the AC or HP is very reasonable, no complaints. However, I am really surprised how loud the units (we have one AC and one HP) are outside. They are newer...
Forum Discussion
There is a fan upgrade available For the Coleman HP. The replacement fan is a computer designed three bladed "shamrock" type....very efficient..very quiet. I installed it today. There is a significant reduction in noise level inside and out.
IME, the noise comes from several bad designs in the HP. First the old fan is a crappy designed multi-blade air beater; the bonnet is a very flexible resin that vibrates sympathetically to the frequencies of the fan, compressor and airhandler like a drum head; the compressor's plumbing rubs/chatters/vibrates against the bonnet.
The fan kit has a brace for holding the bonnet away from plumbing. Good! It no longer sounds like a playing card in a bicycle spoke as the plumbing beats against the bonnet.
I applied aluminum faced butyl tape to the underside of bonnet for insulation & mass dampening. It has killed any resonance in the bonnet and dampens any noise. Works like a champ!
How quiet you ask????? With the generator running you almost can't hear the AC unit running... just a hummmmmmmmmm! On shore power it is quieter than a small vacuum cleaner...again a low hummmmmm. I think most of the noise is from the air being drawn through the condenser.
Got the kit from PPL RV Parts, Houston, TX. Ask for Dan the Parts Man...
IME, the noise comes from several bad designs in the HP. First the old fan is a crappy designed multi-blade air beater; the bonnet is a very flexible resin that vibrates sympathetically to the frequencies of the fan, compressor and airhandler like a drum head; the compressor's plumbing rubs/chatters/vibrates against the bonnet.
The fan kit has a brace for holding the bonnet away from plumbing. Good! It no longer sounds like a playing card in a bicycle spoke as the plumbing beats against the bonnet.
I applied aluminum faced butyl tape to the underside of bonnet for insulation & mass dampening. It has killed any resonance in the bonnet and dampens any noise. Works like a champ!
How quiet you ask????? With the generator running you almost can't hear the AC unit running... just a hummmmmmmmmm! On shore power it is quieter than a small vacuum cleaner...again a low hummmmmm. I think most of the noise is from the air being drawn through the condenser.
Got the kit from PPL RV Parts, Houston, TX. Ask for Dan the Parts Man...
