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  1. #66
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    I dont see how a restrictive filter can
    make a high pressure switch trip. unless you are running heat.

    maybe the 1" pleated is actually preventing the heat transfer which causes high head.

  2. #67
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by SBKold View Post
    I dont see how a restrictive filter can
    make a high pressure switch trip. unless you are running heat.

    maybe the 1" pleated is actually preventing the heat transfer which causes high head.
    Running A/C now, not heat. Won't need heat until maybe January, if then. It's the red button on the outside unit (13 year old Rheem heat pump) that had to be reset to get it to run. I may be mis-informed, but it's been my understanding that the red reset button relates to a high pressure switch, which was tripping about three years ago in heat mode due to a faulty TXV. Since the TXV was replaced, I haven't had to reset the red button again until I tried using the 4" MERV 10 filter earlier this week.

  3. #68
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    I'm familiar with the reset. However this may mean the opposite of what you think.

    The more restrictive merv 8 actually hinders air flow lowering head pressure outside.

    The honeywell could be allowing more heat absorbed inside but then not being released causing high head.

  4. #69
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by SBKold View Post
    I'm familiar with the reset. However this may mean the opposite of what you think.

    The more restrictive merv 8 actually hinders air flow lowering head pressure outside.

    The honeywell could be allowing more heat absorbed inside but then not being released causing high head.
    What you said is probably above my pay grade.... but are you saying if I took out the air filter alltogether, it would cause high head pressure and trip the switch?

    So what could be the cause? FYI, I also tried using a 1" MERV 11 that I had lying around, and it tripped the switch just like the 4" MERV 10 Honeywell did.

  5. #70
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,997

    It's more logical that the reset button is a low pressure switch...?

    Quote Originally Posted by Florida Joy View Post
    Running A/C now, not heat. Won't need heat until maybe January, if then.

    It's the red button on the outside unit (13 year old Rheem heat pump) that had to be reset to get it to run.

    I may be mis-informed, but it's been my understanding that the red reset button relates to a high pressure switch, which was tripping about three years ago in heat mode due to a faulty TXV.

    Since the TXV was replaced, I haven't had to reset the red button again until I tried using the 4" MERV 10 filter earlier this week.
    In the heating mode the outdoor condenser becomes the evaporator trying to absorb heat.

    The outdoor check valve would be in closed position, the TXV needs to open; if it won't open & fails closed, the system will pump down & the low pressure switch will open.

    Likewise; a very restrictive filter causes a pressure drop in the refrigerant system which could possibly reduce pressure enough to trip the low pressure switch.

    It seems to me that the red reset button is probably the low pressure switch, not a high pressure switch.

    It is the only way it makes sense to me & others responding to this thread.

  6. #71
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,170
    Any chance your heat is coming on at night sometimes?
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  7. #72
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by udarrell View Post
    In the heating mode the outdoor condenser becomes the evaporator trying to absorb heat.

    The outdoor check valve would be in closed position, the TXV needs to open; if it won't open & fails closed, the system will pump down & the low pressure switch will open.

    Likewise; a very restrictive filter causes a pressure drop in the refrigerant system which could possibly reduce pressure enough to trip the low pressure switch.

    It seems to me that the red reset button is probably the low pressure switch, not a high pressure switch.

    It is the only way it makes sense to me & others responding to this thread.
    Could be, but page 8 of the spec sheet has this button labeled as "high pressure manual reset".

    http://www.allreds.net/WS2/docs/rhe/rapb_spec.pdf

  8. #73
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by beenthere View Post
    Any chance your heat is coming on at night sometimes?
    No chance. Tstat is an old, very basic White-Rodgers. Changing functions requires one to manually move the switch from "cool" to "off" and then to "heat" and vice versa.

  9. #74
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    Does it have an "Emergency Heat" setting on the thermostat

    It is a heat pump? It's not an electric furnace, correct?

    What is the temp when it trips? Is it cool outside, but warm inside from the days heat gain?
    Always here

  10. #75
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,296
    Quote Originally Posted by Florida Joy View Post
    What you said is probably above my pay grade....
    So what could be the cause? FYI, I also tried using a 1" MERV 11 that I had lying around, and it tripped the switch just like the 4" MERV 10 Honeywell did.
    a 1" MERV 11 could probably ' trip me out' from 200 miles away.

    Not sure of the specific impact from a 4" MERV 10.
    I would Not use more than a MERV 8 in any case.

    If I had health issues, I'd get a portable HEPA unit, that way both me and my equipment can survive.

    EITHER HOSPITAL GRADE
    http://www.abatement.com/patient-iso...ion-hc600f.htm

    or a much more reasonable residential
    http://www.aircareonline.com/portable.html

    Hunter Fan
    _____ replaceable filter

    http://www.hunterfan.com/Air-Purifiers/

    all the way down to a desk top ( which I have)
    + I did NOT say it is quiet ( some people like -white noise - to sleep by)

    http://www.amazon.com/Honeywell-HHT-...d_sim_sbs_hg_1
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  11. #76
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,997
    Quote Originally Posted by Florida Joy View Post
    Could be, but page 8 of the spec sheet has this button labeled as "high pressure manual reset".

    http://www.allreds.net/WS2/docs/rhe/rapb_spec.pdf
    Yep, it definitely indicates it is a high pressure reset button; which means something else is happening to trip it...

  12. #77
    Join Date
    Jun 2011
    Location
    Detroit vicinity, Michigan
    Posts
    79
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-06-2012 at 01:00 PM. Reason: Non Pro * Member

  13. #78
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by energy star View Post
    Does it have an "Emergency Heat" setting on the thermostat

    It is a heat pump? It's not an electric furnace, correct?

    What is the temp when it trips? Is it cool outside, but warm inside from the days heat gain?
    Yes it's a heat pump with emergency heat strips, not an electric furnace. Tstat settings, from left to right = cool, off, heat, emergency heat.

    Changed the filter on Oct 1 to the Honeywell 4". I'd had it almost a month, but decided to "use up" the already installed filter. Went to bed, as usual, around midnight. The next morning I woke up early because it was too hot. The portable thermometer by the bed read 78*, the blower fan was running, but the compressor was not.

    I don't know what time the switch tripped overnight, but the tstat was set to 75* as usual. I checked accuweather.com and the actual overnight low for Oct 1 was 75*. It rained late in the day and overnight, so the humidity was high.

    First thing I tried was resetting the red button. The compressor started and the condenser fan ran normally just long enough for me to go back inside. Then it quit again. I waited a bit and then tried to reset again. It worked a minute or two and then quit again. This time I called my home warranty company and asked for a technician.

    While I was waiting for a callback, I took out the Honeywell 4" and replaced it. I was out of the MERV 8 filters, but I had a MERV 11 in the garage that had moved with me from Virginia in 2009. I put it in and waited about 5 minutes before resetting the red button. Everything started up and began running normally. Then I decided to run to Home Depot and pick up some of the MERV 8 filters I'd been using. When I got back, the switch had tripped again. So I took out the MERV 11 filter, installed the MERV 8, and reset the condenser. It started running again.

    By the time I returned from Home Depot, there was voicemail from the repair contractor, but I didn't call them back right away. I waited an hour or more, and when it didn't trip again, I cancelled the work order with the home warranty company and have had nice cold air ever since, with no further problems.

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