MRCOOL SALES FAQs

Q. Is the MRCOOL DIY Really DO-IT-YOURSELF?

A. Yes!  The MRCOOL DIY is designed to make installation easy:

• Refrigerant lines are precharged. No vacuum required
• Connection is easy. No special tools necessary
• Communication wire is connected easily via snap lock fitting
• Interior mounting plate makes hanging the unit simple and easy

Q. Are you sure the lines don't need to be vacuumed and charged?

A. Yes, we're sure. The R-410A is already there.

Q. What size MRCOOL DIY do need? 

A. Approximate MRCOOL DIY heating and cooling capacity:

• DIY12— up to 500 square feet
• DIY18— up to 750 square feet
• DIY24 — up to 1000 square feet
• DIY36— up to 1500 square feet

Q. What other features come with a MRCOOL DIY?

A. The MRCOOL DIY has great features:

• 16-17.5 SEER Energy Efficiency
• 25' Precharged R-41 OA Refrigerant Quick Connect Linesets
• Easy-to-Use Remote Control
• Use the MRCOOL App to turn your phone into a remote control
• Pre-installed low ambient kit ensures effective low temperature operation
• 7-Year Compressor Warranty and a 5-Year Parts Limited Warranty

Q. Anything else I need to know about installation?

A. Want to know more about how to the install the MRCOOL DIY? 

Click Here for a complete DIY Multizone installation video

Click Here for a complete DIY Ductless Mini Split 3rd Generation Installation Video

• DIY 12K Power Supply 115v, 60HZ, 1 Phase, Minimum Circuit Amp 15 Max Fuse Amp 20
• DIY 18K Power Supply 208-230v, 60HZ, 1 Phase, Minimum Circuit Amp 15 Max Fuse Amp 20
• DIY 24K Power Supply 208-230v, 60HZ, 1 Phase, Minimum Circuit Amp 15 Max Fuse Amp 25
• DIY 36K Power Supply 208-230v, 60HZ, 1 Phase, Minimum Circuit Amp 25 Max Fuse Amp 35

Q. What is the  difference between 2nd Generation & 3rd Generation?

A.  The 3rd Generation is an Energy Star which means it is more energy efficient than the 2nd Generation.  The 3rd generation is also easier to install as the lines are not connected to the condenser ahead of time.  

 Q. Why do I only have one service port located on the low Pressure Side of the Mini Split Lines?

A.  The biggest reason that you don’t see a liquid service port on the outdoor unit is because on a mini-split, the EEV is mounted inside the outdoor unit. Therefore, if you had a port on the liquid service valve, you would be measuring the low pressure exiting the EEV. This will be roughly same pressure as the saturated refrigerant in the middle of the evaporator coil. (This is also why you see the liquid line is insulated as well as the vapor line on mini-split units. Both low temperature lines will attract humidity and absorb heat if there is no insulation on this line set tubing.) A liquid pressure measurement at the liquid line service valve wouldn’t be useful to calculate subcooling and no manufacturer wants you to get confused so no port is mounted there. Some outdoor mini-split units have a liquid service port mounted inside the outdoor unit, underneath the outdoor unit shroud, prior to the EEV(s). This can be used for troubleshooting to determine if there is at least some subcooling prior to the refrigerant entering the EEV(s) but because the manufacturer does not provide us with a target subcooling, this port is not necessarily used to check the charge.