craft 2 ton heating mode problem

[kefah]

hi
i have 2 ton craft split unit
it had leak so i repair it
when i charged the system
it work peftectly in cooling mode
11 a current
40 psi suction line pressure
but when i change it to heating mode
the discharge pressure increases gradually
starting from
8 ampere
100 psi
reaching 475 psi
and current reach 25 a
so compressor start opening relief valve
so pressure decrease to 350 psi then increase to 475 psi
so what is the problem
i checked both capillary tube and filter in outdoor unit they are working very good
voltage is 220 v

[nuwanchamara]

Replace your filter drier

[install monkey]

reversing valve not changing over fully or check valve not opening?

[kefah]

how i can check if the problem is from reversing valve or not

[kefah]

can it be blockage in the indoor unit

[install monkey]

http://www.achrnews.com/articles/don-t-let-that-reversing-valve-outsmart-you
copied from a website- saves me waffling on!!

[kefah]

ok
man i think the reversing valve working
because i install it
then i tested it
before chraging the system

[install monkey]

how did u test it after installation? and did you use a wet rag to keep the body cool?
ok
man i think the reversing valve working
because i install it
then i tested it
before chraging the system

[kefah]

yes
i cool it using wet rig and water
then when i connect and disconnect the RV
its work perfectly
so can it be blockage or that impossible

[install monkey]

easiest way to proove what part is knackered is to degas it, fit gauge points on each pipe between components- the reversing valve may be moving- but not seating correctly!!

[kefah]

can you explain more
now the system not contain *****
ok
i will fit the gauge to both suction line and discharge line connection
ok
then what

[The Viking]

So, out of interest,

What system is this?
What refrigerant is it operating on?
When you repaired it, how deep were your vacuum? Standing?

:cool:

.

[install monkey]

if youve degassed it then cut out the check valves and check you get flow through them- make sure u can braze em back in- also check for strainer gauzes before capillarys they can be clogged- again cut them out to inspect them- or blow through each component to proove flow

[kefah]

So, out of interest,

What system is this?
What refrigerant is it operating on?
When you repaired it, how deep were your vacuum? Standing?

:cool:

.

ok
the system is split unit 24000 btu heating cooling
i repaired leaks and installed reversing valve
refrigerant is r 22

[kefah]

if youve degassed it then cut out the check valves and check you get flow through them- make sure u can braze em back in- also check for strainer gauzes before capillarys they can be clogged- again cut them out to inspect them- or blow through each component to proove flow

ok
i checked the strainer and its ok

[install monkey]

where was the leak originally?- was it on the reversing valve hence the replacement

[kefah]

it was in the indoor unit
the installed reversing valve is new

[install monkey]

so you repaired the leak on the indoor , was the reversing valve jammed???- wondering why you replaced it? did you fit a new drier- heatpump drier?

it was in the indoor unit
the installed reversing valve is new

[kefah]

no the ex reversing valve was jammed
so it been removed
so i installled new one
after the problem happened i checked the filter drier
i didn't find it
it looks like been removed when the ex reversing valved jammed and both removed
so i received the spli without RV
filter drier
i installed the RV
without installing new filter drier

so the problem happened
cooling mode working very good
heating mode cause the compressor overheated

[install monkey]

was the indoor fan running in heating mode? - discharge pressure increased slowly-did the indoor coil get warm prior to reaching 475 psi? there should be 2 strainers/check valves - have u checked the indoor check valve?? trying to find info on craft units- can only find weather craft-

[kefah]

was the indoor fan running in heating mode?
yes
discharge pressure increased slowly ?
yes
did the indoor coil get warm prior to reaching 475 psi?
yes
the indoor get too warm
but the return pipe from it was too little hot
have u checked the indoor check valve
no

[install monkey]

whats the model number

[kefah]

i dont know
but you will not find it
its made only in middle east

[install monkey]

http://www.crafft.co.uk/information.asp?show=5&id=2


i dont know
but you will not find it
its made only in middle east

[kefah]

http://www.crafft.co.uk/information.asp?show=5&id=2

[kefah]

was the indoor fan running in heating mode? - discharge pressure increased slowly-did the indoor coil get warm prior to reaching 475 psi? there should be 2 strainers/check valves - have u checked the indoor check valve?? trying to find info on craft units- can only find weather craft-

was the indoor fan running in heating mode?
yes
discharge pressure increased slowly ?
yes
did the indoor coil get warm prior to reaching 475 psi?
yes
the indoor get too warm
but the return pipe from it was too little hot
have u checked the indoor check valve
no

[kefah]

thanks to every body
today i took the indoor unit then connect it to an other outdoor unit
so it worked both in heating and cooling mode
so the problem no in the outdoor unit
then you suggest me to check the reversing valve
filter drier

if youve degassed it then cut out the check valves and check you get flow through them- make sure u can braze em back in- also check for strainer gauzes before capillarys they can be clogged- again cut them out to inspect them- or blow through each component to proove flow
can you explain more what you mean by check valves
and strainer gauze

[jdunc2301]

Check valve
A valve that closes to prevent backward flow of liquid

Strainer Gauze
"Filter"

[jdunc2301]

RV fault???

[jdunc2301]

10101

Blockage?

[kefah]

Check valve
A valve that closes to prevent backward flow of liquid
Strainer Gauze
"Filter"
thank u for info

RV fault???
may be

10101

Blockage?

i dont know
i searched for the filter i didnt find it
it been removed before by another tech
and i checked the capillary tube
both flow was very good
reversing valve my fault
so before removing it
what you advise me to do

[The Viking]

I'm still thinking non condensables...

:cool:

.

[kefah]

I'm still thinking non condensables...

:cool:

.
what you mean

[kefah]

today i opened the outdoor unit
and removed the rv
i brokeit so i discovered that its jammed
so i will install another rv
i installed filter dryer in the outdoor unit
any suggestion

[kefah]

please help

[jdunc2301]

so did you replace the RV and drier, and did you keep the RV cool during brazing..as per your other post?

[kefah]

so did you replace the RV and drier, and did you keep the RV cool during brazing..as per your other post?
i installed filter drier
tomorrow i will install the RV
i will try to cool it

[kefah]

so any advices

[jdunc2301]

Well, as per your other post on keeping a RV cool during brazing
As it's unlikely you have any cooling gel i would;
Fit the RV on to the pipework without braze.
Wrap the RV body with wet rag/cloth/paper towel
Using the correct method, braze one joint.
Wet the rag/cloth/paper towel again....and repeat until all joints are brazed to satisfaction

I have to add, this should have been covered during your training experience....

[kefah]

Well, as per your other post on keeping a RV cool during brazing
As it's unlikely you have any cooling gel i would;
Fit the RV on to the pipework without braze.
Wrap the RV body with wet rag/cloth/paper towel
Using the correct method, braze one joint.
Wet the rag/cloth/paper towel again....and repeat until all joints are brazed to satisfaction

I have to add, this should have been covered during your training experience....
thank you man
i appreciate that from you
i installed the RV today
how i can check if it works properly before charging the system

[install monkey]

realistically u cant- energisin the coil wont prove that the seals are ok- only vac and gas and run it

[kefah]

only vac and gas and run it

what you mean by gas it
you mean charge it

[jdunc2301]

what you mean by gas it
you mean charge it

Charge it with refrigerant, but i would say it needs a damn good pressure/leak test first, once happy with that it will need a good vac. As your having problems make sure your certain you've achieved a good enough vac. Then charge to rating plate, and test run in all modes, take temps pressures etc and evaluate how well it's working...or not

[kefah]

thank you man
today i installed the split unit
and i vacuumed it
then charged it
it work perfectly in cooling mode
with current 12 ampere
and suction pressure between 55 and 60 psi
but when in heating mode
the heating is perfect
but the current is start with 13 ampere
and pressure increase when it reach 300 then heating effect start
and pressure rise to 430 psi with current 17-18-19 ampere
so the outdoor fan turn off then current be 14 ampere
and compressor keep working and pressure fall hesitatinglyto 300 so the out fan start working
and rise again to 17 18 19 ampere
heating is very good
i checked the filter drier and capillary tube and indoor unit for any blockage and they are clean

[jdunc2301]

thank you man
today i installed the split unit
and i vacuumed it
then charged it
it work perfectly in cooling mode
with current 12 ampere
and suction pressure between 55 and 60 psi
but when in heating mode
the heating is perfect
but the current is start with 13 ampere
and pressure increase when it reach 300 then heating effect start
and pressure rise to 430 psi with current 17-18-19 ampere
so the outdoor fan turn off then current be 14 ampere
and compressor keep working and pressure fall hesitatinglyto 300 so the out fan start working
and rise again to 17 18 19 ampere
heating is very good
i checked the filter drier and capillary tube and indoor unit for any blockage and they are clean

do you mean the outdoor fan comes on at 430psi and off at 300??
are you happy with it now?

[kefah]

no
outdoor fan works perfectly
but when
the pressure reach 430 psi its turn off
so the pressure decrease gradually
then when it reach 300 psi its work again

[kefah]

up
up
up
up

[kefah]

the system now works perfectly
thanks all
please close the thread

[install monkey]

the thread closes after 6 month of no more replies

[kefah]

the thread closes after 6 month of no more replies

thank you for the info