Glossary

    A
  • (Annual Fuel Uitlization Efficiency) is the annual heat output of the boiler compared to the total annual fossil fuel energy consumed by the boiler.
  • An alarm is a condition or error detected while the boiler fires or prepares to fire resulting in boiler shutdown.
  • A device used in hydronic heating systems for controlling water temperature (senses water temperature). Typically used to manage domestic hot water temperature in an Indirect Water Heater.
  • B
  • A Data Communication Protocol for building automation and control networks. A protocol that provides information about a boiler's heating, ventilating, and air conditioning control (HVAC), lighting control, access control, and fire detection.
  • This feature enables you to shut off the Boiler Pump (primary loop pump) while a load is running. The load pump must be piped (series piping) to ensure adequate flow through the boiler without needing the Boiler Pump to provide flow through the heat exchanger. When you set the Boiler Pump to Off a warning message appears as a reminder. If the load is a radiant floor, we strongly recommend using primary/secondary piping and leaving the Boiler Pump set to On.
  • This feature is adjustable independently of the 4 load pumps. Many installations will use a primary (boiler) loop and we recommend that the boiler pump operate for 3 – 5 minutes after all calls for heat have been satisfied.
  • A ratio that compares the full maximum boiler heat output (high fire) to the minimum level of heat output (low fire).
  • This feature is found on a load set to External Control. The setting can be Therm. or Ext. Control so that the load responds to a call for heat from either the Thermostat or External Control. If set as Therm. then the boiler will wait for a call for heat on the Thermostat terminal associated with the load and then look at the Ext. Cont. terminals for the target water temperature signal. If set to Ext.Cont., the controller only uses the Ext. Cont. terminals to determine a call for heat. If the voltage at the Ext. Cont. terminals is below 2.1VDC there is no call for heat. If the voltage is at or above 2.1VDC, then there is a call for heat.
  • C
  • A call for heat could be: The thermostat is indicating that room temperature is below the thermostat setting. An Aquastat calling for DHW. The tank sensor calling for DHW.
  • Occurs if the boiler controller internal diagnostics detects a problem that cannot be corrected. The Controller is continuously running internal diagnostics, checking for correct operation.
  • Running tally of the number of calls for heat that a load has received in the last 24 hours. Fewer cycles per day = better efficiency.
  • D
  • Difference between the supply water temperature and the return water temperature
  • Domestic Hot Water
  • To prevent short cycling, boilers operate with a differential. A differential is based on a boiler’s target temperature. The boiler will shutoff when the supply water temperature is half the differential setting below the target temperature and will open when the supply water temperature is half the differential setting above the boiler target. For example, A boiler that has a target temperature of 150°F will have a differential of 20°F (160°F being the half differential above the target temperature and 140°F being the half differential below the target temperature). For DHW, there is only one differential setting below the target temperature. For example, if the target temperature for the DHW is 135°F, the differential below the target temperature will be 125°F,
  • Daylight Standard Pacific - time zone update.
  • F
  • Fail Safe Enable is available only in External Control and only if the Burner On From is set to External Control. If this feature is active and the External Control voltage drops below 0.25Vdc, the boiler automatically turns on the Boiler Pump (if selected “ON”), the load pump, and operates the boiler to the Fail Safe Set Point temperature. This temperature set point is adjustable.
  • A boiler that is always the first to fire up
  • Flame Out is a value recorded at the bottom of the SIM Status menu. It occurs when the flame signal lowers below 1 µA.
  • US Gallons Per Minute - volume of water flowing, past one point, in one minute
  • Resistance of the water flowing through the piping system - Friction loss increases as the flow rate increases and/or as the pipe size decreases - If the flow rate doubles, the friction loss quadruples for the same pipe size
  • H
  • Temperature sensors on the boiler indicate that water temperature is below the water temperature target or setpoint.
  • The boiler is powered and there is a Call for Heat, Heat is Required. The boiler will start and enter the Heating Cycle unless it is in an error mode.
  • The hi-limit control shuts down the burner if the water temperature rises too high.
  • Heating, ventilation and air conditioning system.
  • I
  • The default setting is Indoor. If an indoor temperature sensor is being used the sensor will normally be connected to the TB2 Indoor Sensor terminals on the controller board. Alternatively the TB2 2nd Loop Sensor input terminals can be wired to the indoor temperature sensor. To support this alternate connection the Indoor ° From setting must be Sec. Loop. Use for shop or warehouse, but not for residential properties.
  • An Internet Protocol (IP) address enables communication (sending and receiving information) between digital devices via the internet.
  • M
  • A Media Access Control (MAC) address is a boiler's unique identification address that enables connection to a network and the transfer of data.
  • A chamber or pipe fitting branching into several openings or lateral outlets for connecting one pipe to other pipes.
  • A unit of power - a thousand BTUs per hour (1 MBH = 1000 BTU/hr)
  • N
  • Not connected
  • Network Time Protocol
  • O
  • The Default setting is Outdoor. If an outdoor temperature sensor is being used the sensor will normally be connected to the TB2 Outdoor Sensor terminals on the controller board. Alternatively the TB2 2nd Loop Sensor or the DHW Sensor input terminals can be wired to the outdoor temperature sensor. To support these alternate wiring options the Outdoor ° From setting must be set to Sec. Loop or DHW to correspond with the wiring.
  • Function used for regulating heat loss depending on outdoor temperatures. Regulates the supply water temperatures and provides more heat when it's colder and less heat when it's warmer.
  • P
  • A point in the heating system when the expansion tank is connected. At this point in the system, the system pressure is always constant.
  • System pressure is expressed in PSI - the total weight of the water in the heating system, plus any additional pressure added to the system - read from the gauge: 1 PSI = 2.31' of water
  • A load has a priority value between 20 and 90. Note: The Priority Value has to be different for each load. A higher numerical value means a higher priority. Consider these values as minutes. The difference between 2 load priority values is the number of minutes the higher priority load will be allowed to operate before switching back to the lower priority load. For example, if DHW has a priority of 80 and the Set Point load has a priority of 50, the DHW load will operate for (80-50) 30 minutes while the Set Point load is temporarily turned off.
  • - Glycol solutions are commonly used in a closed loop where freeze protection is required - Its density is lower than that of water, resulting in lower thermal performance at a given flow and pressure - As a rule of thumb, a 50/50 solution of propylene glycol and water will require an increased system circulation rate (gpm up 10%), and system head (up 20%) to provide performance equivalent to straight water
  • How long a load pump operates after the call for heat has ended. Each load pump can be operated for a period of time after the call for heat has ended. This feature takes the heat left-over in the heat exchanger and nearby boiler piping after the burner has turned off and pumps it into the load. A good example of this is the indirect water heater DHW load. After the tank has reached its target temperature, the boiler shuts down, but allows the load pump to operate for a period of time to transfer heat that is stored in the boiler’s heat exchanger into the hot water tank. You can adjust this feature in seconds from 0 to 900 (15 min). If the load has zone valves that close off the flow to the load as the boiler shuts down, this can be set to 0 sec. You can set each load independently to provide maximum flexibility.
  • R
  • How fast the boiler tries to raise the water temperature flowing through the heat emitters. With a fin tube baseboard radiator, you may want the water temperature to rise quickly to provide heat as quickly as possible. This type of heat emitter has very little mass, so it can heat up quickly. When the call for heat is removed, it cools down quickly. Generally this requires a higher (faster) ramp speed. A radiant floor, on the other hand, has significant mass, and therefore takes a long time to heat up. When the call for heat is removed, the floor is still warm and continues to add heat to the space for a significant period of time. If the indoor temperature overshoots the desired indoor temperature, we recommend reducing the Ramp Speed value. Generally this requires a lower (slower) ramp speed. You can manually set the Ramp Speed by choosing a value from 1 to 10. A setting of 1 will raise the water temperature very slowly and 10 will raise the water temperature very quickly.
  • Rotation setting is used to balance the run time on each boiler on a network. There is a maximum allowable runtime difference between boilers.
  • S
  • Desired or target value at which a thermostat has been set, as for optimum efficiency.
  • The rapid firing - on and off - of a boiler’s burner. Generally this condition should be avoided. A cycle on/off time typically should be 10 minutes or longer.
  • U
  • Energy efficiency measurement for water heaters
  • V
  • The V-10 Portal is a website that allows users to connect to boilers remotely. It enables a contractor or homeowner to manage or monitor IBC SL and VFC boilers that are connected to the internet.
  • Speed at which the fluid is moving: - normal range is 2-4 feet per second for copper, brass, steel pipe and tubing - up to 8 feet per second for Pex and CPVC pipe
  • W
  • The Default setting is Outlet. When set to Outlet the controller will determine the supply water temperature from the outlet temperature sensor on the boiler. Alternatively the 2nd Loop Sensor or the DHW Sensor input terminals can be wired to a water temperature sensor. To support these alternate wiring options the Water ° From setting must be set to Sec. Loop on DHW to correspond with the wiring. Multi-boiler: Most have an external sensor mounted on the building supply water.