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#1
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Capillary thermmostat vs. Bi-metal ones
Hi,
While fixing our PTAC wall mount Carrier unit in sun room, I wondered I can replace SPDT capillary thermostat for heat/cool running on 220V AC. Unit contains 6KW rated heating element/heat pump. Is it possible to replace original capillary thermostat with line voltage SPDT thermostat? Tired of replacing original capillary thermostat at 70.00 a pop. Heating switch contact keeps burning up, p/n HH22UC075. Or I wonder if there is heavier Carrier substitute part no.? |
#2
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Capillary thermmostat vs. Bi-metal ones
On Sunday, October 12, 2014 12:17:26 AM UTC-4, Tony Hwang wrote:
Hi, While fixing our PTAC wall mount Carrier unit in sun room, I wondered I can replace SPDT capillary thermostat for heat/cool running on 220V AC. Unit contains 6KW rated heating element/heat pump. Is it possible to replace original capillary thermostat with line voltage SPDT thermostat? Tired of replacing original capillary thermostat at 70.00 a pop. Heating switch contact keeps burning up, p/n HH22UC075. Or I wonder if there is heavier Carrier substitute part no.? Not sure what the question really is. If the replacement thermostat has at least the rating of the original, it will work electrically. The rest is if it's a different type, where does it sense the air? If the old one has a capillary probe that sits in the air and the new one doesn't then it may behave differently. There is also the issue of will it fit physically. And finally, I guess the issue of modifying a UL listed AC, if you want to get technical. I wonder if the reason they burn out is that the compressor is starting to go and is harder to start? Maybe time for a hard start kit. |
#3
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Capillary thermmostat vs. Bi-metal ones
trader_4 wrote:
On Sunday, October 12, 2014 12:17:26 AM UTC-4, Tony Hwang wrote: Hi, While fixing our PTAC wall mount Carrier unit in sun room, I wondered I can replace SPDT capillary thermostat for heat/cool running on 220V AC. Unit contains 6KW rated heating element/heat pump. Is it possible to replace original capillary thermostat with line voltage SPDT thermostat? Tired of replacing original capillary thermostat at 70.00 a pop. Heating switch contact keeps burning up, p/n HH22UC075. Or I wonder if there is heavier Carrier substitute part no.? Not sure what the question really is. If the replacement thermostat has at least the rating of the original, it will work electrically. The rest is if it's a different type, where does it sense the air? If the old one has a capillary probe that sits in the air and the new one doesn't then it may behave differently. There is also the issue of will it fit physically. And finally, I guess the issue of modifying a UL listed AC, if you want to get technical. I wonder if the reason they burn out is that the compressor is starting to go and is harder to start? Maybe time for a hard start kit. Hi, When weather gets cold heat pump does not come on,but heater is on. Compressor (cool) side contact is always good. Maybe I should put in spark suppressor across heat contact then... Was just thinking. Capillary probe is sensing intake room air temp near the filter. . I was thinking about extending 3 wires for the thermostat to wall mounted line voltage type NO/NC SPDT type 'stat/ Actually another model of this unit has this remote 'stat option kit. Maybe that is what I need, come to think of it. Just exercising my brain for now. |
#4
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Capillary thermmostat vs. Bi-metal ones
Please enlighten me, what is a capillary thermostat? Do you mean a mercury bottle thermostat?
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#5
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Capillary thermmostat vs. Bi-metal ones
On 10/12/2014 10:43 AM, Tony Hwang wrote:
Hi, When weather gets cold heat pump does not come on,but heater is on. Compressor (cool) side contact is always good. Maybe I should put in spark suppressor across heat contact then... Was just thinking. Capillary probe is sensing intake room air temp near the filter. . I was thinking about extending 3 wires for the thermostat to wall mounted line voltage type NO/NC SPDT type 'stat/ Actually another model of this unit has this remote 'stat option kit. Maybe that is what I need, come to think of it. Just exercising my brain for now. What volts and amps do you need? And it the stat for heating? -- .. Christopher A. Young Learn about Jesus www.lds.org .. |
#6
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Capillary thermmostat vs. Bi-metal ones
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#7
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Capillary thermmostat vs. Bi-metal ones
Stormin Mormon wrote:
On 10/12/2014 10:43 AM, Tony Hwang wrote: Hi, When weather gets cold heat pump does not come on,but heater is on. Compressor (cool) side contact is always good. Maybe I should put in spark suppressor across heat contact then... Was just thinking. Capillary probe is sensing intake room air temp near the filter. . I was thinking about extending 3 wires for the thermostat to wall mounted line voltage type NO/NC SPDT type 'stat/ Actually another model of this unit has this remote 'stat option kit. Maybe that is what I need, come to think of it. Just exercising my brain for now. What volts and amps do you need? And it the stat for heating? Hi, This is Carrier PTAC wall mount they quit producing in 2009. Heat pump and 6KW heat strip combo for heat/cool. Works well for our sun room separate from house HVAC also Carrier. Replacing thermostat is PITA, has to take cover off, control panel off,etc. 3 connectors. I was thing about extending those 3 wires to a higher wall position and use line voltage 'stat which is easier to get. Also I'm thinking about snubber across heat contact to protect the contatcts from burning(which is the issue) Snubber is easy to jury rig. A resister and capacitor in series. |
#8
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Capillary thermmostat vs. Bi-metal ones
Ed - Thanx - I've seen the capillary types, never thought about how they worked. Everything I have ever had to work on was the standard bimetallic type. |
#9
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Capillary thermmostat vs. Bi-metal ones
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