Bradford White FT Series Guide rapide

Cascade Instructions

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 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.

Installation and Cascade Instruction Manual

FTFT SERIESSERIES

Wall-hung Modulating Condensing

Gas Boiler (includes optional Floor

stand Accessory Information)

Models: FTHW399NX, FTHW301NX

• Natural Gas (NG)

Factory Conguration

• Propane Gas (LP)

Field-Convertible

Page 2

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 Central Heating ow. Boiler Heating Mode ....................... 4

1.D Miscellaneous Wiring ................................................................. 5

SECTION 2 Piping and Wiring Diagrams..................................... 6

2.A Piping and Wiring Diagrams for FTHW301/399NX boilers ........ 6

SECTION 3 Cascade Communications

(cascade cable)........................................................ 26

3.A Cascade Kit Content and Instructions ...................................... 26

3.B Wiring Connections for Cascade ............................................. 26

SECTION 4 The Control Display................................................. 30

4.A The Control Display ................................................................. 30

4.B The LCD ................................................................................... 31

SECTION 5 Cascade Programming ........................................... 32

5.A Programming a Cascade System ............................................ 32

5.B The Cascade CH Function for Set Point Operation ................. 33

5.C Outdoor Reset Operation ......................................................... 34

5.D Domestic Hot Water ‘Storage Mode’ for Cascade System ...... 34

5.E ‘L-TT or motorized mixing valve Mode’ for Cascade System ... 35

5.F Cascade System Error Codes ................................................. 36

Table of Contents

Page 3

SECTION 1 General Information.

1.A General Plumbing Connection Guidelines

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

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

that work in tandem. Up to 4 boilers can be controlled by a “Leader” FTHW Series boiler with the others acting as

“Followers”.

NOTES: Use piping diameters as per Table 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.

For FTHW301/399NX boilers, use 1-1/2" near boiler piping with a combined equivalent length not to

exceed 10ft to the supply & return headers. Use 2" piping for longer runs.

An optional purge station is not needed for FTHW301/399NX models if the system piping is above the

boilers.

Use both thread tape and pipe dope to connect to the 1½" or 2" CH supply and return.

• 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 top or bottom connections of the boiler. Doing so could damage the

boiler. Such damages ARE NOT covered by product warranty.

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

• All piping should be insulated.

WARNING

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

CAUTION

Use piping diameters as per Table 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.

No of Boiler 301 399 ΔT=25F default ΔT=35F ΔT=45F

2 0 2-1/2" 2" 2"

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

0 2 3" 2-1/2" 2"

3 0 3" 2-1/2" 2"

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

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

0 3 3-1/2" 3" 2-1/2"

4 0 3-1/2" 3" 3"

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

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

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

0 4 4" 3-1/2" 3"

Page 4

1.C Product Flow Paths and Characteristics

1.C.1 Central Heating ow. Boiler Heating Mode.

Figure 1 - CH circulation

CH Supply

CH Return

VentCombustion Air

GAS INPUT

This boiler has top and bottom return and supply water connections. Place the combo brass adaptor tting on the

upper left supply connection. Use at least one of the CH return and CH supply connections. Cap o󰀨 any other

connections that will not be used. Refer to Boiler Installation Manual for detailed boiler installation instructions.

Note that the boiler has top and bottom gas connections. Make sure to install a cap on the opposite gas connection

when installing the gas line to the appliance.

Page 5

1.D Miscellaneous Wiring

Figure 2 - Field Connections for boiler

Page 6

SECTION 2 Piping and Wiring Diagrams

2.A Piping and Wiring Diagrams for FTHW301/399NX boilers

Figure 3 - FT-301/399 Primary Secondary with zone valves and indirect

Page 7

Low Water

Cutoff

(Factory Jumper Installed)

Outdoor

Sensor

(18 Gauge Wire)

Boiler

Pump

(14 Gauge Wire)

System

Pump

(14 Gauge Wire)

POWER TO 24V

TRANSFORMER

(14 Gauge Wire)

END

SW N/O C N/O

ZONE 1

1 2 3 4

ZONE 1

1 2 3 4

ZONE 1

1 2 3 4

ZONE 1

1 2 3 4

FUSE (3 AMP MAX)

ZVC 404

FOUR ZONE ZONE VALVE

CONTROL

WITH OPTIONAL PRIORITY

POWER IN T T

24 VAC

INPUT

MODE

NORMAL RESET

ZONE 1

T T

ZONE 2

T T

ZONE 3

T T

ZONE 4

ZONE 4 PRIORITY

OFF

THERMOSTAT THERMOSTAT THERMOSTAT

DRY

CONTACTS

2 WIRE ZONE VALVE

(NO END SWICTH)

JUMPER

3&4

3 WIRE ZONE VALVE 3 WIRE ZONE VALVE

MOTOR END

SW.

Line Voltage Terminals Low Voltage Terminals Low Voltage Terminals

Generic Zone Valve Controller

DHW

Pump

(14 Gauge Wire)

DHW

Temperature

Sensor or

Aquastat

(18 Gauge Wire)

Page 8

Figure 4 - FT-301/399 with indirect and high / low temp zones

2.A Piping and Wiring Diagrams for FTHW301/399NX boilers

Page 9

Low Water

Cutoff

(Factory Jumper Installed)

DHW

Temperature

Sensor or

Aquastat

(18 Gauge Wire)

Outdoor

Sensor

(18 Gauge Wire)

(14 Gauge Wire)

POWER TO 24V

TRANSFORMER

(14 Gauge Wire)

Line Voltage Terminals Low Voltage Terminals Low Voltage Terminals

INPUT

FOUR ZONE SWITCHING RELAY

WITH OPTIONAL PRIORITY

SLAVE

MASTER

ZONE 4

PRIORITY

OFF

POWER

HI TEMP

120 VOLT CIRCULATORS

MID TEMP

LO TEMP

X X

END

SWITCH

FUSE 1 AMP

1 2 3 4

RESET NORMAL

PLUG-IN CARDS

LO TEMP MID TEMP HI TEMP

T'STATS

120 VAC INPUT

P1P2P3

Generic Pump Controller

Boiler

Pump

(14 Gauge Wire)

DHW

Pump

(14 Gauge Wire)

L-TT

Pump

(14 Gauge Wire)

TT2

Mixing

Valve L-TT temp

Sensor

(18 Gauge Wire)

Page 10

Figure 5 - Multiple - FT-301/399 with Low Loss Header

2.A Piping and Wiring Diagrams for FTHW301/399NX boilers

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