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Disconnecting DHW coil from Burnham V-7-14 boiler

Freeron
Freeron Member Posts: 4
in Oil Heating
First post, here goes.

I want to add a Heat pump hot water heater and abandon in place the coil in the burner so I can turn off the boiler for the summer.

From what I have read here and elsewhere, I should cut off the inlet/outlet pipes to coil and leave open while preventing anything from getting in there.

I also need to lower the aqua stat to off so I can turn the boiler into a cold start one.

Once that is done have furnace cleaned to prevent “cementious” material from building up in the boiler due to condensation.

Because of a broken neutral line during a storm a week ago the auqustat failed and was replaced with a digital one Resideo L7224 / L7248 and it is unclear to me how to proceed with this particular aqua stat.

Below are photos of the current digital aqua stat.



ethicalpaul

Comments

  • HVACNUT
    HVACNUT Member Posts: 6,331
    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 
    Freeron
  • Freeron
    Freeron Member Posts: 4
    HVACNUT said:

    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 

    Thank you.

    One more question. If I needed to keep the boiler warm (so it doesn’t leak, it will leak a little from top left bolt on coil cover) what LL temp should I set that would be wise and economical for summer months?
  • SuperTech
    SuperTech Member Posts: 2,430
    HVACNUT said:
    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 
    Why leave the boiler with the low limit at 160⁰? I usually set the low limit off when getting rid of a tankless coil. I haven't encountered any problems with leakage when converting a boiler to cold start.
  • Freeron
    Freeron Member Posts: 4
    SuperTech said:


    HVACNUT said:

    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 

    Why leave the boiler with the low limit at 160⁰? I usually set the low limit off when getting rid of a tankless coil. I haven't encountered any problems with leakage when converting a boiler to cold start.

    I think he lowered the HL to 160 and LL to off.

  • HVACNUT
    HVACNUT Member Posts: 6,331
    SuperTech said:
    HVACNUT said:
    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 
    Why leave the boiler with the low limit at 160⁰? I usually set the low limit off when getting rid of a tankless coil. I haven't encountered any problems with leakage when converting a boiler to cold start.
    Hi limit to 160°. LL off.
  • HVACNUT
    HVACNUT Member Posts: 6,331
    Freeron said:
    Hold all 3 buttons in until the display shows HL for High Limit. Lower it to 160° using the up and down buttons. The bottom button let's you scroll through the settings. HL Diff, LL will get lowered to off.
    The manual should've been left behind. You can always download it.
    Everything else you said sounds good. 
    Thank you. One more question. If I needed to keep the boiler warm (so it doesn’t leak, it will leak a little from top left bolt on coil cover) what LL temp should I set that would be wise and economical for summer months?
    Get and read the manual. I forget if that aquastat has circulator hold off to help prevent flue condensation.
    If not, the Dew point where flue gases condense is about 135°. So LL to 145° and LL Diff. 10°.
  • Freeron
    Freeron Member Posts: 4
    “Low Limit and Circulator Controller
    On a temperature rise, with the adjustable Differential at the default setting of 10 °F (6 °C), the burner circuit breaks and the circulator circuit makes (assuming no call for heat is present) at the Low Limit setpoint. On a temperature drop of 10 °F (6 °C) below the Low Limit setpoint, the burner circuit makes and the circulator circuit breaks. ” this is from the Resideo online manual.

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