Search:

Type: Posts; User: bob_scheel

Page 1 of 20 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    28
    Views
    1,432

    An air source heat pump can probably be installed...

    An air source heat pump can probably be installed for half the cost of a geothermal. The coefficient of performance of a modern air source pump at -10 degrees is between 2 and 3 meaning you get 2-3 x...
  2. In a previous post you stated that an independant...

    In a previous post you stated that an independant thermometer didn't indicate a drop in temperature as you noticed the comfort level change. If this is true even when the independant thermometer is...
  3. http://www.energy.wsu.edu/Documents/10_spr_iaq_nl....

    http://www.energy.wsu.edu/Documents/10_spr_iaq_nl.pdf

    This article gives a good explanation of comfort vs temperature, humidity, wind, etc.

    When an AC unit starts running it begins to lower...
  4. Replies
    28
    Views
    1,432

    You might consider an air to air heat pump. The...

    You might consider an air to air heat pump. The new high efficiency units are pretty efficient. I installed a 5 ton unit to get away from LP which was costing me $4000 / yr to heat the house. Most...
  5. Vinegar and citric acid are the reason deli cases...

    Vinegar and citric acid are the reason deli cases have more coil leaks than other cases. Attach a zinc sacrificial anode to the coil piping and / or put a box of baking soda in the case on a regular...
  6. Replies
    9
    Views
    666

    I would install an EPR and use it to control the...

    I would install an EPR and use it to control the case temp. This will keep the temp steady and also the evap temp higher so you get less frost. Most of the walmart's we install and service use air...
  7. I would just strap an A19 johnson controls...

    I would just strap an A19 johnson controls thermostat to the return pipe. Set it for 70 degrees and use it to open a 24v motorized ball valve or zone valve to bypass.
  8. You would need to assure that the returning water...

    You would need to assure that the returning water was mixing with enough water from the bldg heating zone to keep the temp actually entering the boiler high enough. If your 10 gpm limit is too high...
  9. When I worked in hospitals we had a sensor that...

    When I worked in hospitals we had a sensor that measured the air velocity thru a fixed oriface that was used to assure that negative air pressure was maintained in patient isolation rooms. If the...
  10. Load limit

    Install a gpm flow limiting valve in the line to the pool. That will limit the maximum amount of btu that you can divert to the pool.
  11. I am using java 7 ver 21 with windows 8 64 bit...

    I am using java 7 ver 21 with windows 8 64 bit and it works fine. You need to disable the java auto update and use either mozilla or chrome with the allow outdated plugins switch as posted earlier....
  12. Replies
    7
    Views
    498

    You need 3 logic boxes. A greater than 70 degrees...

    You need 3 logic boxes. A greater than 70 degrees , A less than 75 degrees, then a logical AND to combine the two outputs if they are both true.
  13. Another factor is that some server rooms include...

    Another factor is that some server rooms include high speed printers and decollators. The paper absorbs moisture and swells or shrinks accordingly. This causes jams in the machines. So old school...
  14. I am controlling 4 ultras from a metasys...

    I am controlling 4 ultras from a metasys UNT1144-0 It has 4 0-10vdc outputs which we use to control the firing rate of each boiler. We also monitor the alarm contact on each boiler so the EMS can...
  15. Replies
    9
    Views
    740

    I have a customer with an old 8 story bldg. that...

    I have a customer with an old 8 story bldg. that has poor insulation on the steam pipe risers and condensate return runs. They used to turn the steam on and off several times a day by hand because...
  16. Replies
    17
    Views
    1,818

    Most of these additional energy costs are...

    Most of these additional energy costs are associated with moving BTu's from a physical plant equipment room to the occupied space that it is needed in. The distance is the variable that eats up your...
  17. Replies
    17
    Views
    1,818

    Pump power is largely determined by the length...

    Pump power is largely determined by the length and rise of the run. VFDs can help with energy costs but every installation will be different in its requirements.
  18. Replies
    13
    Views
    1,564

    Leakage current during the heating season is not...

    Leakage current during the heating season is not a serious issue because the waste heat does go towards heating the building and is unlikely to drive temps beyond their control setpoints. During the...
  19. Replies
    32
    Views
    5,567

    I had to retrofit an enviroguard rack from a...

    I had to retrofit an enviroguard rack from a Johnson Controls board to CPC. Had to enter a program in CPC's einstein to handle the enviroguard. Whenever a compressor is running, refrigerant is bled...
  20. Replies
    3
    Views
    1,102

    The link below has a pdf with the manual and...

    The link below has a pdf with the manual and wiring diagram.
    ...
  21. You can squirt some nitrogen into the fittings...

    You can squirt some nitrogen into the fittings before you braze. Even though it is not flowing it will still prevent oxidation. Also the small amount of oxidation created would be blown out by a...
  22. Make sure that the solenoid valve is closing...

    Make sure that the solenoid valve is closing completely as well. Sometimes old ones leak by and that will cause the icing too.
  23. Replies
    8
    Views
    1,201

    Most compressor manufacturers cut open a number...

    Most compressor manufacturers cut open a number of their warranty returns to perform an inspection to determine the cause of the failure. You can usually request that they inspect your unit and let...
  24. Replies
    5
    Views
    834

    If the rotating valves are still operable, then...

    If the rotating valves are still operable, then you would need a 24volt solenoid valve for each station. Then control of those solenoid valves would require 8 digital outputs from a controller on...
  25. This time of year with high humidity and probably...

    This time of year with high humidity and probably more beer moving in and out of the walk in. Your thermostat is probably not cycling very often. A box can defrost during the off cycle IF it gets a...
Results 1 to 25 of 487
Page 1 of 20 1 2 3 4
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event