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I installed a carrier 38MGQF-36-6 mini split system for one…

Customer Question
I installed a carrier...

I installed a carrier 38MGQF-36-6 mini split system for one of my customers and he had all of the wiring done by an electrician who used solid romex wire, I know that's good for the feed but not between the evaps and the condensing unit. A good deep vacuum was pulled after nitrogen testing the line sets, I powered up the unit and a ^P6 code showed up on the evap sections of the system. I'm believe that the wires from condensing unit and the evaporators is what's keeping it off line.

Contractor's Assistant: Did you double-check the thermostat? And what about the unit's filters?

Remote stats and brand new evap units

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Submitted: 8 months ago.Category: HVAC
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Answered in 2 hours by:
9/21/2017
HVAC Technician: David Bowden, General Contractor replied 8 months ago
David Bowden
David Bowden, General Contractor
Category: HVAC
Satisfied Customers: 856
Experience: Owner at Floridaco
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The P6 Error Code Definition: (Unit Size 36K – 42K) = Communication error between the inverter drive and main board. What size Romex wire was used?

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Customer reply replied 8 months ago
12
HVAC Technician: David Bowden, General Contractor replied 8 months ago

Do you know the amp rating of the units? #12 will support up to 20amps.

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Customer reply replied 8 months ago
The wire feeding the condenser is #10 romex and the wire feeding the evap sections is #14 3 romex the amp rating of the unit is 27 amp min circuit
HVAC Technician: David Bowden, General Contractor replied 8 months ago
10 handles 30 amp if copper wire and 14 handles 15 amp
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Customer reply replied 8 months ago
Could the type of wire be the issue, being that it is solid unshielded wire that travels from the condensing unit to the evap sections. The condenser is located near the electric meter and incoming power.
HVAC Technician: David Bowden, General Contractor replied 8 months ago
Wire is wire regardless of how it is encased even romex has wires that are wrapped similar to off the reel
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HVAC Technician: David Bowden, General Contractor replied 8 months ago
Romex is usually installed inside walls and ceiling not on the surface
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David Bowden
David Bowden, General Contractor
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