NTI Tft60 - 399 Installation And Operation Instructions Manual

Also see for Tft60 - 399: Installation and operation instructions Installation and operation instructions

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NTI Tft60 - 399 Installation And Operation Instructions Manual Manual pdf 49 page image

Tft Series Installation and Operation Instructions │Trinity49Lead Lag Instructions - CommonPlumbing – install as many as 8 Tft 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 PUMP Boutput; see Field Wiring Figure 12-1 and Table 12-1. The Boiler Pump must be sized according to Table 10-4.Communication Wiring – using 3-wire cable, daisy-chain terminals DATA +, DATA – and DATA COM of eachboiler in parallel; see Field Wiring Table 12-2a and Figure 12-2.System Sensor (Optional) – install a system sensor (NTI P/N: 84010) on the outlet (supply) pipe feeding theheating system, see Figure 2-4. Wire the system sensor to SENSOR COM and SYSTEM of the Master Boiler; seeField Wiring Table 12-2a and Figure 12-2. The system sensor automatically becomes the modulation sensor forthe boiler system, i.e. the control attempts to achieve setpoint temperature at the location of the sensor. If asystem sensor is NOT used, at the Master boiler set the applicable sensor input to Unconfigured as follows:Configure – Sensor Configuration – S10 (J10-7) sensorOutdoor Sensor (Optional) – wire the outdoor sensor to SENSOR COM and OUTDOOR of any one of theboilers in the cascade; see Field Wiring Table 12-2a and Figure 12-2. Note: only one outdoor sensor is needed forthe 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, set Masterenable 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# ofUnitsTft60 Tft85 Tft110 Tft155 Tft175 Tft200 Tft250 Tft300 Tft399Pipe Size Pipe Size Pipe Size Pipe Size Pipe Size Pipe Size Pipe Size Pipe Size Pipe Size2 1” 1-1/4” 1-1/2” 1-1/2” 2” 2” 2” 2-1/2” 2-1/2”3 1-1/4” 1-1/2” 2” 2” 2” 2-1/2” 2-1/2” 3” 3”4 1-1/2” 2” 2” 2-1/2” 2-1/2” 2-1/2” 3” 3” 3”5 1-1/2” 2” 2-1/2” 2-1/2” 3” 3” 4” 4” 4”6 2” 2” 2-1/2” 3” 3” 4” 4” 4” 5”7 2” 2-1/2” 2-1/2” 3” 4” 4” 4” 4” 5”8 2” 2-1/2” 3” 3” 4” 4” 4” 5” 5”Note: Minimum pipe size based on assumed temperature rise of 25ºF at maximum firing rate.