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New r410 condensing unit and new evaporator coil. gauges go…

Customer Question
New r410 condensing unit...

New r410 condensing unit and new evaporator coil. gauges go straight to retard when unit starts

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

All things new except line set

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

Yes

Contractor's Assistant: Anything else we should know to help you best?

I dont think so

Submitted: 8 months ago.Category: HVAC
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Answered in 3 minutes by:
9/26/2017
HVAC Technician: airheatman, HVAC Technician replied 8 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,030
Experience: Furnace, A/C and heat pump specialist.
Verified

Are bot service valves open and what is model on unit?

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Customer reply replied 8 months ago
service valves are open, dont have model number with me but its a goodmen
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Do you have blue on large valve and red on small? And does it do same in cool or heat mode if it is a heat pump?Are you an ac tech?

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Customer reply replied 8 months ago
i am a tech and have installed several of these units. just havent run into this before. my first thought was blockage but everything is new but line set and i can blow nitrogen through it
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Thanks for this info. I work with experienced techs as well as folks who have no idea what a multi meter is,That is why I asked.Is this a single phase unit and are we working with single phase power supply?

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Customer reply replied 8 months ago
all single phase.
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Sounds like either a doa compressor or electrical issue.Are you in COOL mode and is it a heat pump or ac?

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Customer reply replied 8 months ago
cool mode and it is a heat pump. also i changed condenser and evaporator coil twice just in case and doing the same thing both times
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Same issue with two different condensing units?

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HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Wow that is a weird one. If we had a restriction, high side would retard but suction would be at or near vaccuun

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HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Have you verified proper voltage on each phase of power?

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Customer reply replied 8 months ago
everything reads correct
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

I know it sounds next to impossible to be two compressors in a row, but if voltage is right, not much else I could think of.Like I say if it were a restriction both would not retard

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Customer reply replied 8 months ago
im sorry i should have been more clear. Only the low side is going to retard. i am only showing around 150 on the high side on a 410 unit and also the last 8 compressors i got 5 were bad out of the box so not so crazy
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

If low side is retarding and you can blow through tubing with nitrogen , almost has the be an issue with the compressor.The reason I asked about single phase it it sounded to me like compressor was running backwards which can happen easily with a 3 phase unit

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Customer reply replied 8 months ago
i am license electrician so i know about the phasing. just wondering if the compressor could be bypassing but i dont hear the usual hissing sound
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Did you try heat mode just to see if it behaved differently?If not I would do that and verify not a bad reversing valve

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Customer reply replied 8 months ago
that would suck. I did not try heat but i will. still 2 different units that would be weird to
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

I agree.No doubt whatever the issue is that something strange is going on.When can you go back ?

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Customer reply replied 8 months ago
tomorrow morning
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Let's try heat mode and see if we get a difference

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Customer reply replied 8 months ago
i will try that and double check everything and see what i get.
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Sounds like a plan.We will go from there

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Customer reply replied 8 months ago
thanks
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Thanks for letting work with you

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