NTI FTG 600 Installation And Operation Manual

Also see for FTG 1200: Conversion instructions

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NTI FTG 600 Installation And Operation Manual Manual pdf 44 page image

Installation & Operation Manual│ FTG4411.0 LEAD LAG INSTRUCTIONSMultiple Boiler ApplicationsThe FTG controller has the internal capacity to stage or Lead-Lag up to 8 boilers configured in a cascade. ThisLead-Lag capability allows a designated “Master” boiler to communicate with and effectively control eachboiler in a multiple boiler system. This function is accomplished by “Daisy Chaining” a 3-wire cable betweeneach of the boilers and enabling the Master parameter in the boiler of your choice. The boiler with the Masterparameter enabled becomes the single point of contact for Central Heating, Domestic Hot Water and OutdoorReset settings and control wiring. Use the instructions detailed in this section to set-up and install the cascadeboiler system; reference Appendix A – Controller and Touchscreen Display Instructions for details on moreadvanced settings and for assistance with navigating the touchscreen display.Lead Lag Instructions - CommonPlumbing – install as many as 8 FTG boilers in parallel in a primary/secondary plumbing configuration asillustrated in Figure 11-1. Size common piping as per Table 11-1.Boiler Pump – each boiler must have its own circulator (see Figure 11-1) which is controlled by its BOILERPUMP output; see Field Wiring Figure 12-2 and Table 12-1. The Boiler Pump must be sized according toTable 10-3.Communication Wiring – using 3-wire cable, daisy-chain terminals LL DATA +, LL DATA – and COMMUN.COM of each boiler in parallel; see Field Wiring Table 12-2 and Figure 12-3.System Sensor (Optional) – install a system sensor (NTI P/N: 84010) on the outlet (supply) pipe feeding theheating system, see Figure 11-1. Wire the system sensor to the SYSTEM SENSOR terminals of the MasterBoiler; see Field Wiring Table 12-2 and Figure 12-3. The system sensor automatically becomes themodulation sensor for the boiler system, i.e. the control attempts to achieve setpoint temperature at thelocation of the sensor. If a system sensor is NOT used, at the Master boiler set the applicable sensor input toUnconfigured as follows:Configure – Sensor Configuration – S10 (J10-7) sensorOutdoor Sensor (Optional) – wire the outdoor sensor to the OUTDOOR SENSOR terminals of any one of theboilers in the cascade; see Field Wiring Table 12-2 and Figure 12-3. Note: only one outdoor sensor is neededfor the multiple boiler system.Modbus Address – assign a unique MB2 Modbus Address to each boiler in the cascade. Access the MB2Modbus Address setting via the System Identification & Access menu as follows:Configure – System Identification & Access – MB2 Modbus AddressMaster Enable – choose one (and only one) boiler in the cascade to be the Master, this boiler will receive allcontrol wiring and will be used for setting control parameters (see steps below). On this one boiler, setMaster enable equal to Enabled via the Lead Lag Master Configuration menu, accessed as follows:Configure – Lead Lag Master Configuration – Master enableTable 11-1 Minimum Pipe Sizes for Multiple Boiler Applications# ofUnitsModelFTG 600 FTG 800 FTG 1200 FTG 1400 FTG 2000 FTG 2200 FTG 24002 3 in. 4 in. 4 in. 4 in. 5 in. 5 in. 5 in.3 4 in. 4 in. 5 in. 5 in. 6 in. 6 in. 6 in.4 4 in. 4 in. 5 in. 5 in. 6 in. 6 in. 8 in.5 4 in. 5 in. 6 in. 6 in. 8 in. 8 in. 8 in.6 5 in. 5 in. 6 in. 6 in. 8 in. 8 in. 8 in.7 5 in. 5 in. 6 in. 8 in. 8 in. 8 in. 8 in.8 5 in. 6 in. 8 in. 8 in. 8 in. 8 in. 8 in.Note: Minimum pipe size based on assumed temperature rise of 25ºF at maximum firing rate.