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02-01-2023, 03:50 PM #1
Mitsubish city multi - not heating
Hi
I have an issue with a Mitsubishi city multi system not providing much heat.
system is circa 2001 - but still in reasonable condition. Outdoor is a PURY P250 YMF with 9 ducted PDYF P20 indoor units. I suspected it may have been short of gas - but recovered and gas charge - is as per commissioning sheet.
Hot gas seems to reaching the BC box(49c) - but air off temp at indoors is only around 22c
I got the following data from sw1
Comp freq 82
Discharge 20 bar
Suction 3 bar
BC box P1 47 P3 39
TH11 10.3
TH12 1.7
TH13 99?
TH14 99?
TH15 0
TH16 12.8
LEV 3 440
INDOOR LEV'S - ALL AT 2000
Any ideas?
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02-01-2023, 07:33 PM #2
Re: Mitsubish city multi - not heating
What are your actual suction and discharge pressures? Do they correspond to what the system thinks the pressure transducers are reading?
Mostly found in the southern part of this green and pleasant land.
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02-01-2023, 07:48 PM #3
Re: Mitsubish city multi - not heating
Yes - gauges read the same as sw1 readings
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03-01-2023, 04:36 PM #4
Re: Mitsubish city multi - not heating
Is it 407c? What discharge temp are you getting? Is compressor at full speed for above readings?
Mostly found in the southern part of this green and pleasant land.
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04-01-2023, 08:01 PM #5
Re: Mitsubish city multi - not heating
Yes it’s a 407c unit. I spent a bit of time looking at it today.one thing I found - was that th1 thermistor{ compressor discharge) was reading 123c even with the unit off, I changed the sensor but it made no difference, still showed 123c when running, when-pipe temp was only 76c.
Would this be enough, to stop the compressor ramping up to full load ? Im presuming it must be an issue with the main board causing the sensor reading error.
I have a board off a PUHY YMF C, it looks the same, but was going to check to see if it’s compatible with a PURY unit, as a replacement board is £350 .
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05-01-2023, 08:35 PM #6
Re: Mitsubish city multi - not heating
Yes, i think this will prevent full load on compressor, big weird that just this thermistor is not reading right, worth checking board though.
Mostly found in the southern part of this green and pleasant land.
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06-01-2023, 04:07 PM #7
Re: Mitsubish city multi - not heating
If this is a PURY-P250 YMF-C unit than the discharge temp. probe is TH11 and not TH1.
Last edited by narkom; 06-01-2023 at 05:48 PM.
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06-01-2023, 04:36 PM #8
Re: Mitsubish city multi - not heating
Hi Narkom, thanks for your reply.
yes its a PURY - P250 YMFC CIRCA 2001
I was just going by the handbook I have image 2 pury ymf c .jpg sw1 .jpg
My manual doesn't list any SW1 switch settings for a th 11 - do you have them
thanksLast edited by BROBERTSON; 06-01-2023 at 04:44 PM.
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06-01-2023, 05:36 PM #9
Re: Mitsubish city multi - not heating
This is the manual for a PURY-200YMF unit and not for PURY-P200YMF.
I have a manual for PURY-P400, 500YMF-C, hope this will help
https://www.mediafire.com/file/ijbxyd1se1zevb5/F1105_214.pdf/file
Last edited by narkom; 06-01-2023 at 06:06 PM.