Brute Elite | Page 39 |
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DANGER
•Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds.
•Children, disabled and elderly are at hightest risk of being scalded.
•See instruction manual before setting temperature at heating appliance.
•Feel water before bathing or showering.
•If this appliance is used to produce water that could scald if too hot, such
as domestic hot water use, adjust the outlet
control (limit) or use temperature limiting valves to obtain a maximum water temperature of 125°F (52°C).
operation there are several settings in the "setup" menu structure that must be adjusted for the specific installation, each is covered in the following sections.
8.12.1 Lead Lag Setpoint
The lead lag setpoint is set from the "user" menu using the "LL" variable. This is the temperature the boiler is attempting to maintain at the system sensor. This setting doesn't control the boiler outlet temperature, so the water temperature at the boiler outlet may be much hotter than the system temperature setpoint. Adjust the LL setpoint to the desired operating temperature of the system.
8.12.2Lead Lag Master/Slave Selection
In the SETUP menu structure, the "LL" menu
allows the lead lag system to be turned on and the boiler to be configured as a master or slave control. In each lead lag system there can only be one master control, so proper selection is important to avoid operating issues. To set the boiler to lead lag "master" operation the LL menu should be set to "LDR". To set the boiler to slave, "SLA" should be selected.
8.12.3 Lead Lag Address
The Lead Lag address must be set for each boiler connected to the lead lag system. Each boiler must have a unique address selected for the system to work properly. Typically, the lead or master boiler should be set to address one and the remaining boilers should be set to values
8.12.4 Lead Lag Hysteresis
The lead lag system uses a hysteresis value set in the setup menu, called, "HS". The hysteresis and setpoint values control the on and off points of the boiler. If the lead lag setpoint is adjusted to 120°F with a hysteresis value of 5°F the boiler will turn off when the water temperature reaches 125°F and will turn back on when the water temperature reaches 115°F. Set the hysteresis values to match the boiler to the system operating characteristics. Setting this value correctly
will help reduce the chance of short cycling.
8.12.5 Lead Lag Base Load Setting
The lead lag system uses a base load setting that is set through the "setup" menu called "bL". The base load setting identifies the firing rate that the operating boiler must achieve before the next boiler in the system is allowed to operate. The default setting is 50% to avoid short cycling and operating the boilers at higher, less efficient, firing rates.
8.13 Boiler Pump Interrupt
WARNING
Failure to plumb, pump and install the appliance correctly when using this feature may lead to reduced or no water flow through the heat exchanger, causing premature failure of the heat exchanger, personal injury or death. Please consult the factory with any questions regarding the use of this feature.
The boiler pump interrupt feature is used in some applications when the boiler is being used for both hydronic and domestic hot water heating. The interrupt jumper is used to turn off the boiler pump during a domestic hot water demand. For this to work properly the system must be plumbed and pumped to allow the domestic hot water pump to supply the flow and head requirements for the boiler and indirect water heater together. It is not necessary to use the interrupt jumper in all applications. Specific modes of operation that may require the use of this feature are shown in Section 6.
NAME | FUNCTION | VALUE |
CH on | Burner demand begins when the | 5°F |
differential | outlet water temperature reaches |
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| "Outlet water temperature setpoint" |
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| minus "CH on differential" |
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CH off | Burner demand ends when the | 5°F |
differential | outlet water temperature reaches |
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| "Outlet water temperature setpoint" |
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| plus "CH off differential" |
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DHW on | Burner demand begins when the | 2°F |
differential | outlet water temperature reaches | |
| "Outlet water temperature setpoint" | 5°F |
| minus "DHW on differential" | |
DHW off | Burner demand ends when the | 10°F |
differential | outlet water temperature reaches | |
| "Outlet water temperature setpoint" | 5°F |
| plus "DHW off differential" | |
Pump | Operates the pump for the overrun | 1 or 5 |
overrun | time after the burner demand | minutes |
| has ended |
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High | Locks the boiler out when the high | 200°F |
limit | limit temperature is reached |
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| (requires manual reset) |
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Flame | Flame signals lower than the flame | 0.8Vdc |
threshold | threshold interrupt burner operation |
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DHW | Time for domestic hot water priority | 60 min. |
priority time |
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| Table 15. Default Control Settings. |
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