Laars EBP0110 Installation, Operation And Maintanance Manual

Laars EBP0110 Installation, Operation And Maintanance Manual Manual pdf 25 page image

Endurance Page 256.4. These do not show on the control display, but it ishelpful to know how they affect the control logic ofthe Endurance units.6.5.1 ACV Release (EBP only)When the EBP is in tank charge mode, and thereis a call for space heating, the EBP needs to know atwhat temperature it can release the ACV (anti-condensing valve) back to the space heating position,allowing the hot water to go into the system. The ACVrelease point is the “burner off” point minus 5°F(3°C). For example, if the “burner off” point is 190°F(88°C), the ACV release point is 185°F (85°C). Thismeans that when the supply temperature reads 185°F(85°C) in the tank, it will release the ACV for heatingmode.6.5.2 Tank Charge Setting (EBP only)When the temperature at the tank sensor goesbelow the tank charge setting, the EBP will be in “tankcharge” mode. The tank charge setting equals theprogrammed “burner off” point minus a fixed 40°F(22°C) differential. For example, if the “burner off”point is 190°F (88°C), the EBP will go into “tankcharge” mode when the tank sensor reads below 150°F(66°C). The ACV will close, and the EBP will run tobring the supply temperature up to 185°F (85°C), andthe ACV will be released back to the space heatingmode (as long as there is no call for domestic hotwater).6.5.3 Burner On PointThe “Burner On” point is calculated bysubtracting the “Burner On Differential (Dif)” fromthe “Burner Control Point.” For EBP units thedifferential is fixed at 13°F (7°C) and for EDP/EDNunits, it is adjustable (shown as “Dif” in the setupmenu) from 4°-30°F (2°-17°C). This value tells theEndurance when to re-energize during a call for heatin which the Endurance reached its “Burner OffPoint.”6.5.4 Modulation PointDuring a call for heat, the Endurance will igniteat low fire and will begin to modulate to match theload as it approaches the “Burner Control Point.”There is no fixed temperature when this will occur,and this value is not displayed on the Endurance.6.6 Other Control Functions6.6.1 Using Buttons on ControlFigure 30 shows a drawing of the control,including the placement of the four buttons. Table 4shows the actions associated with each of the buttons.6.4.5 “Oal” Minimum OutdoorReset PointThe “Oal” parameter tells the controller what theminimum allowable supply temperature can be,regardless of the outdoor reset calculation.For EDP/EDN units, the default setting is 170°F(77°C) and it is adjustable 155-200°F (68-93°C).For EBP units, the default setting is 170°F(77°C) and it is adjustable 170-200°F (77-93°C). Notethat the difference between EBP and EDP/EDNadjustment ranges is because the EBP units must beable to keep the transfer tank at a high enoughtemperature to generate the domestic water throughthe DHW heat exchanger.6.4.6 “rc” Outdoor Reset RatioThe outdoor reset ratio is shown as “rc” in thedisplay. The ratio determines part of the relationshipbetween the outdoor temperature and the Endurancesupply temperature. It is adjustable between 0.1 and 5.The reset number represents the increase in theCalculated Setpoint (CSP)for every degree below thewarm outdoor shutdown temperature.The boiler control calculates CSP = Oal + (oTo –air temp) x rc.6.4.7 “oTo” Warm Outdoor ShutdownWhen in the outdoor reset function is on, thecontrol has the ability to shut down the boiler systemwhen the outdoor temperature sensor reads the “oTo”temperature that is set. This parameter is adjustablefrom 55°-70°F (13°-21°C) and has a default setting of65°F (18°C). The warm outdoor shutdown featurewill, of course, not affect the generation of domesticwater in the EBP models.6.4.8 “unI” Temperature UnitsThe control has the ability to display and beprogrammed in both °F (Fahrenheit) or °C (Celsius).The “unl” lets the user choose between °F and °C.6.4.9 “Dif” Burner On DifferentialThe differential between the Burner ControlPoint and the Burner On Point is shown as “Dif” in thedisplay. If the Endurance reaches the Burner Off Pointduring a call for heat, and the call for heat continues,this differential will determine at what point below theBurner Control Point the Endurance will energizeagain. In the EBP models, this differential is fixed at13°F (7°C) to ensure that the transfer tank will beproperly charged. In the EDP/EDN models, thisdifferential is adjustable 4°-30°F (2°-17°C).6.5 Calculated Control ValuesThere are several control values that are notdirectly set by the user, but are calculated by the boilercontrol, once the user has set the parameters in Section