Laars FT Series Manuel utilisateur

Cascade Instructions Document 1349C

H2384200C

WARNING

If the information in this manual is not

followed exactly, a re or explosion may

result causing property damage, personal

injury or loss of life.

Do not store or use gasoline or other

ammable vapors and liquids in the vicinity of

this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not

use any phone in your building.

• Immediately call your gas supplier from a

nearby phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call

the re department.

Installation and service must be performed

by a qualied installer, service agency, or gas

supplier.

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation

could create carbon monoxide gas in ue gases which could cause serious 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 inammables dans

le à proximité de cet appareil ou de tout autre

appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE

GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous servir

des téléphones dans le bâtiment où vous vous

trovez.

• Appelez immédiatement votre fournisseur de

gaz depuis un voisin. Suivez les instructions

du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de

gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par

un installateur ou un service d’entretien qualié

ou par le fournisseur de gaz.

Cascading the

Floor Standing and Wall-Mounted

Modulating Condensing Gas

Heating Only Boilers

FT SERIES

Floor Models: B/LFTHF199

Wall-Mounted Models: B/MFTHW 100, 140, 199

• Natural Gas (NG)

Factory Conguration

• Propane Gas (LP)

Field-Convertible

Page 2

Table of Contents

SECTION 1 General Information. .........................................3

1.A General Plumbing Connection Guidelines ................................. 3

1.B Pipe Sizing for system and common supply

& return headers in Cascade Systems ....................................... 3

1.C Product Flow Paths and Characteristics .................................... 4

1.C.1 Floor Standing CH Circulation .................................................. 4

1.C.2 Wall-Mounted CH Circulation ................................................... 5

1.D High Voltage and Low Voltage Terminals

(wall and oor models) ............................................................... 5

1.E Miscellaneous Wiring .................................................................. 6

SECTION 2 Piping 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.A Programming a Cascade System ............................................ 28

5.B The Cascade CH Function for Set Point Operation ................. 29

5.C Outdoor Reset Operation .......................................................... 30

5.D Domestic Hot Water ‘Storage Mode’ for Cascade System. .... 30

5.E Cascade System Error Codes .................................................. 32

Page 3

Cascading the

FT Series ‘Heating Only’ Boiler

WARNING

Do not use FT Series units on common vents. Each unit must have its own supply and exhaust vents.

SECTION 1 General Information.

1.A General Plumbing Connection Guidelines

• Pipe material must be suitable to meet local codes and industry standards.

• The pipe must be cleaned and without blemish before any connections are made.

• Do not apply a torch within 12˝ of the bottom connections of the boiler. Doing so could damage the

boiler. Such damages ARE NOT covered by product warranty.

• Isolation (shutoff valves) should be used to ease future service.

• All piping should be insulated.

• Pump speeds in Table 1 refer to the internal boiler pump.

Multiple FT Series boilers can be connected via a cascade communication cable to create a bank

of boilers that work in tandem. Up to 20 boilers can be controlled by a “Leader” FT Series boiler

with the others acting as “Followers”. All cascaded boilers must be the same model and size.

1.B Pipe Sizing for system and common supply & return headers in Cascade Systems

Use piping diameters as per Tables 1 - 3 based on your maximum 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 1¼˝ or 1½" 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 for longer runs.

Refer to page 8 of the FT Floor Installation and Operating Manual to set the internal valves as

follows for cascade operation: V1 and V3: closed,V2 open. (See next page)

An optional purge station is not needed for FT Floor models if the system piping is

above the boilers.

FT Piping Manifolds should NOT be utilized in wall-mounted multi-boiler cascade systems.

Table 1: Common Pipe Sizing for ∆T= 25 F (Speed 3 - default)

Model/# of units 1 2 3 4

5678

100 1" 1-1/2" 2 2 2-1/2" 2-1/2" 3 3

140 1-1/4" 2 2 2-1/2" 2-1/2" 3 3 4

199 1-1/4" 2 2-1/2" 3

3444

Table 2: Common Pipe Sizing for ∆T= 35 F (Speed 2)

Model/# of units 1 2 3 4

5678

100 1" 1-1/4" 1-1/2" 2 2 2 2-1/2" 2-1/2"

140 1" 1-1/2" 2 2 2-1/2" 2-1/2" 2-1/2" 3"

199 1-1/4" 2 2 2-1/2" 2-1/2" 3 3 4"

Table 3: Common Pipe Sizing for ∆T= 45F (Speed 1)

Model/# of units 1 2 3 4

5678

100 3/4" 1" 1-1/4" 1-1/2"

2222

140 1" 1-1/4" 1-1/2" 2 2 2 2-1/2" 2-1/2"

199 1" 1-1/2" 2 2 2-1/2" 2-1/2" 3 3

Page 4

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

DHW

TEMP.

SENSOR

DHW PUMP

L N G L N G

CH PUMP CASCADE

SYSTEM

SENSOR

Line Voltage Terminals

Low Voltage Terminals

High and Low Voltage Terminals, Floor VS Wall.

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

AC24V

OUTPUT

DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMPL N G

MAIN POWER L/ZC L-T/T PUMP

N GL/ZC

L-T/T

CASCADE

SYSTEM

SENSOR

Low Voltage TerminalsLow Voltage Terminals

1.C Product Flow Paths and Characteristics

Factory default valve position:

V1 and V3 open, V2 closed (single boiler).

For cascade operation with boiler pump:

Close V1 and V3. Open V2.

The oor model FT has these additional ----------------- voltage connections / functionalities

CH Supply

CH Return

Combustion Air Vent

GAS INPUT

The oor 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 return

connection.

Max Amp draw per pump = 1.6 Amps.

1.C.1 Floor Standing CH Circulation

Boiler

Circulation

Pump

Figure 1. Floor model CH circulation

with LLH.

Page 5

Cascading the

FT Series ‘Heating Only’ Boiler

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

DHW

TEMP.

SENSOR

DHW PUMP

L N G L N G

CH PUMP CASCADE

SYSTEM

SENSOR

Line Voltage Terminals

Low Voltage Terminals

High and Low Voltage Terminals, Floor VS Wall.

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

AC24V

OUTPUT

DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMPL N G

MAIN POWER L/ZC L-T/T PUMP

N GL/ZC

L-T/T

CASCADE

SYSTEM

SENSOR

Low Voltage TerminalsLow Voltage Terminals

The oor model FT has these additional ----------------- voltage connections / functionalities

The wall-mounted models do NOT have a built-in low loss 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

CH Return

Combustion Air Vent

GAS INPUT

CH Supply CH Return

Gas Input

Combustion Air Vent

NOTE: The terminal blocks are NOT the same on the

oorstanding VS the wall-mounted models!

WALL MODELS

FLOOR MODELS

Page 6

R 0-10V W

(+) INPUT (-)

LWC O/ST/T

AC24V

OUTPUT DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMP

Outdoor

Sensor

(18 Gauge Wire)

L N G

MAIN POWER L/ZC L-T/T PUMP

N GL/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)

(14 Gauge

Wire) (14 Gauge

Wire)

(14 Gauge

Wire)

External Remote TACO LWCO and High Limit Wiring Diagram, Combi.

System

Pump DHW

Pump

L-T/T

Pump

DHW

Temp Sensors

or Aquastat

(18 Gauge Wire)

Thermostat

or Endswitch

(18 Gauge Wire)

TACO LTR STD Wire Harness

Hydrolevel harness

Green

White

Red

Yellow

TACO LTR0243T-1

Low Water Cut-Off

Hydrolevel SAFGARD

Model 1100, Low Water Cut-Off

Thermostat

or Endswitch

(18 Gauge Wire)

7070

Floor Model Boiler 1 (Lead)

1.E Miscellaneous Wiring

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

DHW

TEMP.

SENSOR

DHW PUMP

L N G L N G

CH PUMP CASCADE

SYSTEM

SENSOR

Line Voltage Terminals

Low Voltage Terminals

High and Low Voltage Terminals, Floor VS Wall.

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

AC24V

OUTPUT

DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMPL N G

MAIN POWER L/ZC L-T/T PUMP

N GL/ZC L-T/T

CASCADE

SYSTEM

SENSOR

Low Voltage TerminalsLow Voltage Terminals

WALL

MODELS

FLOOR

MODELS

NOTE: The terminal blocks are NOT the same on the oorstanding VS the wall-mounted models!

A step-down transformer (120V to 24V) will be required on a Wall model for 24 volt output.

Figure 5. Taco LTR0243T-1 -OR- SAFGard 1100

External LWCO

Page 7

Cascading the

FT Series ‘Heating Only’ Boiler

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

AC24V

OUTPUT DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMP

Outdoor

Sensor

(18 Gauge Wire)

L N G

MAIN POWER L/ZC L-T/T PUMP

N GL/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)

External Remote TACO LWCO and High Limit Wiring Diagram, Combi.

Hydrolevel Company

SafGard

Model 500 (24VAC)

Low Water Cut-Off

2 1 P1 P2 A

(18 Gauge

Wire)

(14 Gauge

Wire) (14 Gauge

Wire)

(14 Gauge

Wire)

System

Pump DHW

Pump

L-T/T

Pump

DHW

Temp Sensors

or Aquastat

(18 Gauge Wire)

Thermostat

or Endswitch

(18 Gauge Wire)

Thermostat

or Endswitch

(18 Gauge Wire)

7070

Boiler 1 (Lead)

R 0-10V W

(+) INPUT (-)

LWC

O/ST/T

AC24V

OUTPUT DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMP

Outdoor

Sensor

(18 Gauge Wire)

L N G

MAIN POWER L/ZC L-T/T PUMP

N GL/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-Off

2 1 P1 P2 A

(14 Gauge

Wire) (14 Gauge

Wire)

(14 Gauge

Wire)

System

Pump DHW

Pump

L-T/T

Pump 70

DHW

Temp Sensors

or Aquastat

(18 Gauge Wire)

Thermostat

or Endswitch

(18 Gauge Wire)

Thermostat

or Endswitch

(18 Gauge Wire)

Floor Model Boiler 1 (Lead)

NOTE: The terminal blocks are NOT the same on the oorstanding VS the wall-mounted models!

A step-down transformer (120V to 24V) will be required on a Wall model for 24 volt output.

Figure 6. SAFGard 500

External LWCO

Figure 7. SAFGard 550

External LWCO

Page 8

See Section 1.B on page 3 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.

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.

WARNING: This drawing shows

suggested piping conguration 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 oor heating only models, cascaded reverse return with zone valves.

Page 9

Cascading the

FT Series ‘Heating Only’ Boiler

R 0-10V W

(+) INPUT (-)

LWC O/ST/T

AC24V

OUTPUT DHW

TEMP.

SENSOR

DHW PUMP

N GL N G SYSTEM PUMPL N G

MAIN POWER L/ZC L-T/T PUMP

N GL/ZC L-T/T

CASCADE

SYSTEM

SENSOR

Cascade

System

Sensor

(18 Gauge Wire)

R 0-10V W

(+) INPUT (-)

LWC O/ST/T

AC24V

OUTPUT DHW

TEMPERATURE

SENSOR

DHW PUMP

N GL N GSYSTEM PUMPLN G

MAIN POWER L/ZC L-T/T PUMP

N GL/ZC L-T/T

CASCADE

SYSTEM

SENSOR

Wiring Diagram for Cascaded Reverse Return with Zone Valves

Floor Model Boiler 1 (Lead)

Floor Model Boiler 2 (Follow)

POWER IN

T T

ZONE 1 T T

ZONE 2 T T

ZONE 3 T T

ZONE 4

OFF

END

SW.

MODE

ZONE VALVE CONTROL

FOUR ZONE,

WITH OPTIONAL PRIORITY

NORMAL RESET

THERMOSTAT

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

SELFCLOSING)

MOTOR END

SW.

FUSE (3 AMPMAX)

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 Voltage Terminals

(14 Gauge Wire) Optional External

Low Water Cutoff

(Factory Jumper Installed)

Line Voltage Terminals Low Voltage Terminals

POWER TO 24V

TRANSFORMER

(14 Gauge Wire)

Low Voltage Terminals

(14 Gauge Wire) Optional External

Low Water Cutoff

(Factory Jumper Installed)

Generic Zone Valve Controller

NOTE: The terminal blocks are NOT the same on

the oorstanding VS the wall-mounted models!

See Section 1.D on page 5

Figure 9. Wiring diagram for cascaded reverse return with zone valves.

Page 10

Cascade FT Floor Heating Only Boilers Piping and Wiring Diagrams (continued)

See Section 1.B on page 3 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 conguration 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 oor heating only models, cascaded reverse return with zone pumps.

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