Original message
| cband
 |  "MaxTemp heat pump"
, posted Tue 27 Jun 10:33  
Anyone hear of this ? 3 ton pool heat pump. Techumseh
compressor. 220 v. 1ph. NO ELECTRONICS in the system
completely mechanical. high side cut out, low side cut out,
24 V. trans. , 2 wire contactor, delay on make relay, and
mechanical stat. on water cooled condensor. If i have a hydro
glitch or power failure the unit will never restart unless i
turn off the 220 volt breaker and turn it back on again. The
unit will cycle properly on stat. The delay relay and cap. were
blown when i got it. replaced cap. but bypassed relay until i
received new one. Unit cycled flawlessly with or without new
relay. The condensing fans shut down too so it is in the 220 V
side. I haven't measured voltages when it is running and after it stopped to see what if any the difference is. Haven't had the
time and hydro hasn't gone out yet. hydro should go out in the next thunder storm but don't feel like playing with 220 in the
rain. If i have to do it i'll do it. I called MaxTemp and they
have no clue. Any ideas ?
kalinin refrigeration
|
|
Replies:
|
| dagogoda
| "Re(1):MaxTemp heat pump" , posted Sun 27 Jul 07:34
I had a similer problem except that the pump did not restart if for any reason the high pressure sensor tripted. There was an électrical connector on the high pressor sensor that failed each time that sensor tripted so i had to shake it to assure connectivity, replaced it and now it is fine.
By the way, i' m looking for info for Maxtemp Maxpool 24 heat pump on the web and i cant find anything.
Can anyone help ?
Thanks
Daniel
|
| Xenos
| "Re(1):MaxTemp heat pump" , posted Tue 27 Jun 17:40
Was the lockout relay replaced with a standard relay? If yes replace it again with a higher impendence relay so there is a slight delay in it firing. Or atleast look at how the relay is wired into the safety curcuit.
Xenos.
The best way to escape a problem is to solve it.
|
| | cband
| "Re(2):MaxTemp heat pump" , posted Tue 27 Jun 19:34
Xenos - I haven't rechecked the relay. As far as i know it is a
normal adjustable delay on make in the 24 volt line. It is set for 3 mins. and when the stat calls for heat the condensing fans
fire and 3 mins. later the compressor fires. I must be missing something. As everyone know the shoe makers kids go bare foot.
there is no other relay in the system unless the one there now
is the wrong one ! I had the same problem with the relay missing
and bypassed. go figure. Is there an electronic load trip built
into the compressor ? I dought it but you never know. i can't find the specs on this compressor in my Tecumseh book.
kalinin refrigeration
|
| | Xenos
| "Re(3):MaxTemp heat pump" , posted Tue 27 Jun 19:57
I just assumed there may be a lockout relay wired in parallel with the safety circuit to lock out the system on a failure.
Xenos.
The best way to escape a problem is to solve it.
|
| | fitter597
| "Re(4):MaxTemp heat pump" , posted Tue 27 Jun 22:42
Xenos is right, thats the only thing in a complete mechanical system that will only allow it to run after you reset the power, could be the same relay with double pole double throw
LOCAL 597 PIPEFITTERS
"We Do It Right The First Time"
|
| | cband
| "Re(5):MaxTemp heat pump" , posted Wed 28 Jun 12:31
Here is the thing. The unit ran for 2 years without the delay
relay with the same problems. I replaced the relay just because
and to help cut down the start load on the compressor. besides
the relay is there for a reason. I'll simulate a failure today
and do some measuring. There are only 8 electrical components
in the unit. compressor, high cut out, low cut out, machanical
stat.,cap. , 24 volt transformer, and contactor, and delay relay. i'll let you know what happends.
kalinin refrigeration
|
|
|
