Laars B/LFTHF199 Instructions Manual Download Page 19 | Manualshive

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Page 19

Cascading the FT Series ‘Heating Only’ Boiler

NOTE: These drawings

are meant to show system

piping concept only.

Installer is responsible for
all equipment and detailing

required by local codes.

NOTE: The cascading

communications cable

is 60" long. This must

be considered during
installation as this leaves

only about 12" between

adjascent units.

Leader

Follower

CASCADE

SYSTEM

SENSOR

SUPPLY

RETURN

RETURN

SUPPLY

PRIMARY LOOP

(SPACE HEATING)

PRIMARY/SECONDARY

CONNECTION

Do not exceed 12" apart

SECONDARY LOOP (SPACE HEATING)

ZONE 1

ZONE 2

ZONE 3

12"

Max

Figure 19.

Two FT wall-mounted heating only models, cascaded with zone valves.

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Summary of Contents for B/LFTHF199

Page 1: ...us injury property damage or death Improper installation and or operation will void the warranty AVERTISSEMENT Assurez vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d incendie ou d explosion ou pour éviter tout dommage matériel toute blessure ou la mort Ne pas entreposer ni utiliser d essence ou ni d autres vapeurs ou liquides inflammables dans l...

Page 2: ...ng and Wiring Diagrams 8 2 A Cascade FT Floor Heating Only Boilers Piping and Wiring Diagrams 8 2 B Cascade FT Wall Mounted Heating Only Boilers Piping 18 SECTION 3 Cascade Communications the cascade cable 22 3 A Cascade Kit Content and Instructions 22 3 B Wiring Connections for Cascade 22 SECTION 4 The Control Display 26 4 A The Control Display 26 4 B The LCD 27 SECTION 5 Cascade Programming 28 5...

Page 3: ... design delta T Non adherence to these sizing guidelines may result in premature boiler failure and resulting problems are NOT covered by product warranty CAUTION Use both thread tape and pipe dope to connect to the 1 or 1 CH supply and return Notes For FT Floor boilers use 1 1 4 near boiler piping with a combined equivalent length not to exceed 15 ft to the supply return headers Use 1 1 2 piping ...

Page 4: ...itional CH Supply CH Return Combustion Air Vent GAS INPUT V3 V1 The floor standing models have a built in low loss header The boiler circulation pump circulates the CH water in the boilers contained loop from heat exchanger to the low loss header LLH and back The heating system pump or individual zone pumps are required to pull heated water from CH supply connection and return water to the CH retu...

Page 5: ...ss header The boiler circulation pump circulates the CH water out the common header up to 15 of equivalent pipe at 1 5 diameter pipe Max Amp draw per pump 1 6 Amps 1 C 2 Wall Mounted CH Circulation 1 D High Voltage and Low Voltage Terminals Figure 2 Wall Mounted CH circulation Figure 3 Field Connections for WALL models Figure 4 Field Connections for FLOOR models CH Supply Boiler Circulation Pump C...

Page 6: ...auge Wire TACO LTR STD Wire Harness Hydrolevel harness Green White Red Yellow Yellow TACO LTR0243T 1 Low Water Cut Off Hydrolevel SAFGARD Model 1100 Low Water Cut Off Thermostat or Endswitch 18 Gauge Wire OR 70 70 Floor Model Boiler 1 Lead 1 E Miscellaneous Wiring R 0 10V W INPUT LWC O S T T DHW TEMP SENSOR DHW PUMP L N G L N G CH PUMP CASCADE SYSTEM SENSOR Line Voltage Terminals Low Voltage Termi...

Page 7: ...HW TEMP SENSOR DHW PUMP N G L N G SYSTEM PUMP Outdoor Sensor 18 Gauge Wire L N G MAIN POWER L ZC L T T PUMP N G L ZC L T T CASCADE SYSTEM SENSOR Line Voltage Terminals Low Voltage Terminals POWER TO 24V TRANSFORMER 14 Gauge Wire Low Voltage Terminals 14 Gauge Wire 18 Gauge Wire External Remote TACO LWCO and High Limit Wiring Diagram Combi Hydrolevel Company SafGard Model 550 120VAC Low Water Cut O...

Page 8: ...ust the internal LLH valves V 1 V 2 V 3 to their proper positions PRIOR to boiler installation WARNING This drawing shows suggested piping configuration and valving Check with local codes and ordinances for additional requirements SECTION 2 Piping and Wiring Diagrams 2 A Cascade FT Floor Heating Only Boilers Piping and Wiring Diagrams Figure 8 Two FT floor heating only models cascaded reverse retu...

Page 9: ...ZONE 1 1 2 3 4 1 ZONE 4 PRIORITY 2 3 4 ZONE 2 1 2 3 4 ZONE 3 1 2 THERMOSTAT 3 4 ZONE 4 JUMPER 3 4 2 WIRE ZONE VALVE NO END SWITCH 3 WIRE ZONE VALVE POWER OPEN 4 WIRE ZONE VALVE SELF CLOSING 1 2 3 MOTOR END SW FUSE 3 AMP MAX 24 VAC INPUT DRY CONTACTS N 0 C N C POWER THERMOSTAT Outdoor Sensor 18 Gauge Wire Line Voltage Terminals Low Voltage Terminals POWER TO 24V TRANSFORMER 14 Gauge Wire Low Voltag...

Page 10: ...SECTION 3 on page 22 for cascade kit details WARNING This drawing shows suggested piping configuration and valving Check with local codes and ordinances for additional requirements See Section 1 C on page 4 for reference to adjust the internal LLH valves V 1 V 2 V 3 to their proper positions PRIOR to boiler installation Figure 10 Two FT floor heating only models cascaded reverse return with zone p...

Page 11: ...N CARDS RESET NORMAL SR 504 EXP T STATS ZONE 1 ZONE 3 POWER ZONE 1 ZONE 2 ZR Wiring Diagram for Cascaded Reverse Return with Zone Pumps Floor Model Boiler 1 Lead Floor Model Boiler 2 Follow P3 P2 P1 Outdoor Sensor 18 Gauge Wire Line Voltage Terminals Low Voltage Terminals POWER TO 24V TRANSFORMER 14 Gauge Wire Low Voltage Terminals Line Voltage Terminals Low Voltage Terminals Low Voltage Terminals...

Page 12: ...ION 3 on page 22 for cascade kit details WARNING This drawing shows suggested piping configuration and valving Check with local codes and ordinances for additional requirements See Section 1 C on page 4 for reference to adjust the internal LLH valves V 1 V 2 V 3 to their proper positions PRIOR to boiler installation Figure 12 Two FT floor heating only models cascaded reverse return with pumps and ...

Page 13: ...MP N G L ZC L T T CASCADE SYSTEM SENSOR INPUT 120 VOLT CIRCULATORS X X END SWITCH ZC 120V RELAY FUSE 1 AMP SLAVE MASTER 1234 ZONE 4 PRIORITY ON OFF POWER ZONE 2 ZONE 3 FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY PLUG IN CARDS RESET NORMAL SR 504 EXP T STATS ZONE 1 ZONE 3 POWER ZONE 1 ZONE 2 ZR Wiring Diagram for Cascaded Reverse Return with Pumps and Indirect Floor Model Boiler 1 Lead Floor M...

Page 14: ...for common pipe sizes for system and return supply headers for different system Delta T s See SECTION 3 on page 22 for cascade kit details WARNING This drawing shows suggested piping configuration and valving Check with local codes and ordinances for additional requirements See Section 1 C on page 4 for reference to adjust the internal LLH valves V 1 V 2 V 3 to their proper positions PRIOR to boil...

Page 15: ...rminals Line Voltage Terminals Low Voltage Terminals Low Voltage Terminals DHW PUMP N G L N G SYSTEM PUMP L N G MAIN POWER 14 Gauge Wire 14 Gauge Wire L Z C L T T PUMP N G L ZC L T T CASCADE SYSTEM SENSOR Wiring Diagram for Cascaded Reverse Return with Low Temp Zones and Air Handlers P1 P2 TT1 TT2 Optional External Low Water Cutoff Factory Jumper Installed Optional External Low Water Cutoff Factor...

Page 16: ...age 4 for reference to adjust the internal LLH valves V 1 V 2 V 3 to their proper positions PRIOR to boiler installation WARNING This drawing shows suggested piping configuration and valving Check with local codes and ordinances for additional requirements Figure 16 Three FT floor heating only models cascaded reverse return with zone pumps and indirect ...

Page 17: ...for Cascaded Reverse Return with Zone Pumps and Indirect P4 DHW Aquastat Stage 1 18 Gauge Wire P3 P2 P1 Line Voltage Terminals Low Voltage Terminals R 0 10V W INPUT LWC O S T T AC24V OUTPUT DHW TEMPERATURE SENSOR Low Voltage Terminals DHW PUMP N G L N G SYSTEM PUMP L N G MAIN POWER 14 Gauge Wire L Z C L T T PUMP N G L Z C L T T CASCADE SYSTEM SENSOR Optional External Low Water Cutoff Factory Jumpe...

Page 18: ...s responsible for all equipment and detailing required by local codes NOTE The cascading communications cable is 60 long This must be considered during installation as this leaves only about 12 between adjascent units 2 B Cascade FT Wall Mounted Heating only Boilers Piping Leader Follower PRIMARY SECONDARY CONNECTION SUPPLY PRIMARY LOOP SPACE HEATING SECONDARY LOOP SPACE HEATING SUPPLY RETURN CASC...

Page 19: ...ading communications cable is 60 long This must be considered during installation as this leaves only about 12 between adjascent units Leader Follower CASCADE SYSTEM SENSOR SUPPLY RETURN RETURN SUPPLY PRIMARY LOOP SPACE HEATING PRIMARY SECONDARY CONNECTION Do not exceed 12 apart SECONDARY LOOP SPACE HEATING ZONE 1 ZONE 2 ZONE 3 12 Max Figure 19 Two FT wall mounted heating only models cascaded with...

Page 20: ...0 long This must be considered during installation as this leaves only about 12 between adjascent units Cascade FT Wall Mounted Heating Only Boilers Piping Diagrams continued Mixing Valve Zone Valve Actuators Circulation pump Pressure relief valve Air separator Expansion tank Diaphragm type Isolation valve Check valve 2 way valve Indirect DHW Tank Air Separator Pressure Reducing Valve Purge Cascad...

Page 21: ...er dedicated to Domestic Hot water Cascade System System Application DHW Tank Follower Leader CLOSELY SPACED TEES MAKE UP WATER Indirect DHW Tank DHW SYSTEM PUMP DHW TEMP SENSOR SPACE HEATING ZONE CIRCUIT ZONE CIRCULATORS PURGING VALVES COLD WATER CASCADE SYSTEM SENSOR Figure 21 Two FT wall mounted heating only models cascaded and with DHW Tank ...

Page 22: ...y Installation and Operation Instructions for details Make sure that power is disconnected OFF at boiler before continuing with these instructions The FT heating only boilers can be controlled by only the cascade system sensor either with or without the outdoor sensor The cascade system sensor FT1868 must be connected to the Leader boiler in order to provide feedback for the system set point refer...

Page 23: ...an end Leader Control Board Leader Control Board Follower Control Board Follower Control Board Last Female Connector Plug the included Ending Resistor into it Last Female Connector Plug the included Ending Resistor into it Shown are the control boards of the FT heating only wall mounted units Shown are the control boards of the FT heating only floor units Figure 22 Cascade wiring for FT Floor mode...

Page 24: ...le is 60 long Routing for the FT Floor models can be via the side floor plastic knock outs provided Place boilers within 16 from each other Routing for the wall mounted units can be via the bottom or back side knock outs Place unit within 12 from each other Follow local codes for both systems Terminal Blocks Knock Outs Cascade Connection Pin FT1861 FT Series Cascade Communication Cables Install pe...

Page 25: ... for DHW Ensure the DHW circulator is wired to the DHW Pump contacts on a boiler that is piped to the indirect water heater If there is an active call for Heat and a simultaneous call for DHW the boiler s receiving the DHW call will prioritize the DHW call while the remaining boilers in the cascade will continue to attempt to satisfy the call for Heat Reference the FT Series Wall Mounted or Floor ...

Page 26: ...f Display Power was Off Installer Mode C Heating Water CH set point change mode Maxium 82 C 180 F D Time Date Set No Change To SET Year Month Week Day Time Min E Scroll Select Menu select or value up down or setting dial The Control Display has a Control Dial E 4 buttons A B C D and a Liquid Crystal Display with 72 back lit segments Section 3 will show you only a few of the functions of the FT Ser...

Page 27: ...ication DHW Demand Demand Call indication Info Installer mode Information Installer mode indication Communication state Communication state indication Time setting mode Time Display Install mode indication Fan operating mode Fan operating mode indication Flame signal Flame Signal indication Space Heating Pump mode Space Heating Pump indication DHW Pump mode DHW Pump indication Boiler Pump mode Boi...

Page 28: ...ff Before connecting the cascading cables to the boiler there are 2 items that need to be programmed on all units Start with the Lead Unit and then Repeat on all Following Units make sure to power down each unit after completing steps 1 thru 6 below Once completing steps 1 thru 6 on all boilers connect the boilers using the cascade cables and power up all boilers 28 cP PARAMETER The TOTAL NUMBER o...

Page 29: ...r 4 Cascade mode operates via system sensor Units shut off when system sensor reaches system target temperature 5 Each boiler s built in circulator operates anytime the boiler fires 6 If a system pump is used it should be controlled by the CH Pump contacts on the Leader The system pump will operate anytime any of the cascade units fire Indicate Indicator Current CH Temperature Set Point Celsius or...

Page 30: ...e is 30 minutes and can be adjusted from 0 to 60 minutes using parameter 24 dP see parameter table below Using an Aquastat When using a DHW aquastat the aquastat monitors the temperature of the indirect water heater Connect the DHW aquastat to the DHW Temp Sensor terminals of the boiler piped to the indirect water heater When using a DHW aquastat Parameter 39 39 SA must be set to AquA The boiler s...

Page 31: ...problem persists replace the main control NOTE During the error state the units will continue to operate Boiler setpoint will be the same as the system sensor setpoint until the issue is remedied During normal operation boiler setpoint is defaulted to 20 F higher than the system setpoint to a maximum of 180 F setting Er 78 Cascade Communication Error NOTE This error will only appear in a cascaded ...

Page 32: ... NOTE This error will only appear in a cascaded system 1 Turn power OFF and ON at the boiler display panel 2 If error reappears ensure all cascaded boilers are powered ON 3 If error reappears check Installer Mode parameter 28 at the Leader boiler Ensure the number of cascaded units chosen in this parameter matches the number of cascaded units in the system 4 If error reappears check Installer Mode...

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