Reliable LT56 Series User manual

Model LT56 Series Special Sprinklers
Designed specifically for corridors and hallways
K5.6 (80 Metric)
cULus Listed
Bulletin 058 Rev. B November 2016
Model LT56C
Models LT56 & LT56-300 Models LT56L & LT56L-300
Product Features
• 28 ft x 10 ft (8.5 m x 3 m) max. coverage area
• cULus Listed for Light Hazard occupancies
• Increased spacing and reduced water demand
in corridors compared with traditional extended
coverage sprinklers
Product Description
Model LT56 series sprinklers are cULus Listed Specific Ap-
plication sprinklers designed for installation in accordance
with NFPA 13. The sprinklers produce a spray pattern that is
specifically designed to cover long narrow spaces, such as
corridors and hallways, with fewer sprinklers and less wa-
ter demand compared with traditional extended coverage
sprinklers.
Model LT56 series sprinklers are quick-response sprinklers
for use in Light Hazard occupancies only. Model LT56 and
Model LT56-300 sprinklers have a glass bulb operating ele-
ment. Model LT56L, LT56L-300, and LT56C sprinklers have
a fusible link operating element. Model LT56, LT56-300,
LT56L, and LT56L-300 sprinklers are available with Model
FV recessed escutcheons, Model FP recessed escutch-
eons, or Model CCP concealed cover plates. Model LT56C
sprinklers require a Model G4 flat concealed cover plate.
Sprinkler Model Operating
Element
Max. Working
Pressure
psi (bar)
Styles Coverage
Areas
Sprinkler
Identification
Number (SIN)
LT56 Glass Bulb 250 (17.2)
Pendent, Recessed Pendent or
Conical Concealed Pendent
Table B RA5814
LT56L Fusible Link 250 (17.2) Table C R5814
LT56-300 Glass Bulb 300 (21) Table D RA5914
LT56L-300 Fusible Link 300 (21) Table E R5914
LT56C Fusible Link 175 (12) Flat Concealed Table F RA5994
Table A
www.reliablesprinkler.com
Model LT56C Sprinkler with Model G4 Flat Cover Plate
Model FV EscutheonModel FV Escutheon
Model FP Escutheon Model FP Escutheon
Model CCP Cover Plate

Bulletin 058 Rev. B
November 2016
Page 2 of 10
www.reliablesprinkler.com
Model LT56 Specific Application Sprinkler SIN RA5814
Technical Specifications
Style: Pendent, Recessed Pendent, or
Conical Concealed
Threads: 1/2” NPT or ISO 7-1 R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 250 psi (17.2 bar)
Min. Spacing: 14 ft. (4.3 m)
Material Specifications
Thermal Sensor: 3 mm glass-bulb
Sprinkler Frame: Brass Alloy
Button: Copper Alloy
Sealing Assembly: Nickel Alloy with PTFE
Load Screw: Bronze Alloy
Deflector: Bronze Alloy
Sprinkler Finishes
(See Table H)
Sensitivity
Quick-response
Temperature Ratings
155°F (68°C)
200°F (93°C)
Recessed Escutcheons/Cover Plates
Model FV recessed escutcheon
Model FP recessed escutcheon
Model CCP cover plate
Sprinkler Wrenches
Model D (pendent)
Model GFR2 (recessed and concealed)
Listings and Approvals
cULus Listed
Model LT56 Sprinkler Components and Dimensions Figure 1
Model LT56 Sprinkler Hydraulic Design Criteria Table B
Minimum Flow and Residual Pressure
Max. Coverage Area
ft. x ft.
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
28 x 8
(8.5 x 2.4)
23
(87)
16.9
(1.17)
28 x 10
(8.5 x 3.0)
28
(106)
25.0
(1.72)
Note: For coverage area dimensions less than or between those listed above, use the minimum required flow for the next highest coverage
area for which hydraulic design criteria are stated.

Bulletin 058 Rev. B
November 2016
Page 3 of 10
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Model LT56L Specific Application Sprinkler SIN R5814
Technical Specifications
Style: Pendent, Recessed Pendent, or
Conical Concealed
Threads: 1/2” NPT or ISO 7-1 R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 250 psi (17.2 bar)
Min. Spacing: 14 ft. (4.3 m)
Material Specifications
Thermal Sensor: Nickel Alloy Solder Link
Sprinkler Frame: Brass Alloy
Button: Copper Alloy
Sealing Assembly: Nickel Alloy with PTFE
Load Screw: Bronze Alloy
Deflector: Bronze Alloy
Sprinkler Finishes
(See Table H)
Sensitivity
Quick-response
Temperature Ratings
165°F (74°C)
212°F (100°C)
Recessed Escutcheons/Cover Plates
Model FV recessed escutcheon
Model FP recessed escutcheon
Model CCP cover plate
Sprinkler Wrenches
Model D (pendent)
Model GFR2 (recessed and concealed)
Listings and Approvals
cULus Listed
Model LT56L Sprinkler Components and Dimensions Figure 2
Model LT56L Sprinkler Hydraulic Design Criteria Table C
Minimum Flow and Residual Pressure
Max. Coverage Area
ft. x ft.
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
28 x 8
(8.5 x 2.4)
23
(87)
16.9
(1.17)
28 x 10
(8.5 x 3.0)
28
(106)
25.0
(1.72)
Note: For coverage area dimensions less than or between those listed above, use the minimum required flow for the next highest coverage
area for which hydraulic design criteria are stated.

Model LT56-300 Specific Application Sprinkler SIN RA5914
Technical Specifications
Style: Pendent, Recessed Pendent, or
Conical Concealed
Threads: 1/2” NPT or ISO 7-1 R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 300 psi (21 bar)
Min. Spacing: 14 ft. (4.3 m)
Material Specifications
Thermal Sensor: 3 mm glass-bulb
Sprinkler Frame: Brass Alloy
Button: Copper Alloy
Sealing Assembly: Nickel Alloy with PTFE
Load Screw: Bronze Alloy
Deflector: Bronze Alloy
Sprinkler Finishes
(See Table H)
Sensitivity
Quick-response
Temperature Ratings
155°F (68°C)
200°F (93°C)
Recessed Escutcheons/Cover Plates
Model FV recessed escutcheon
Model FP recessed escutcheon
Model CCP cover plate
Sprinkler Wrenches
Model D (pendent)
Model GFR2 (recessed and concealed)
Listings and Approvals
cULus Listed
Model LT56-300 Sprinkler Components and Dimensions Figure 3
Model LT56-300 Sprinkler Hydraulic Design Criteria Table D
Minimum Flow and Residual Pressure
Max. Coverage Area
ft. x ft.
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
28 x 8
(8.5 x 2.4)
23
(87)
16.9
(1.17)
28 x 10
(8.5 x 3.0)
28
(106)
25.0
(1.72)
Note: For coverage area dimensions less than or between those listed above, use the minimum required flow for the next highest coverage
area for which hydraulic design criteria are stated.
Bulletin 058 Rev. B
November 2016
Page 4 of 10
www.reliablesprinkler.com

Model LT56L-300 Specific Application Sprinkler SIN R5914
Technical Specifications
Style: Pendent, Recessed Pendent, or
Conical Concealed
Threads: 1/2” NPT or ISO 7-1 R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 300 psi (21 bar)
Min. Spacing: 14 ft. (4.3 m)
Material Specifications
Thermal Sensor: Nickel Alloy Solder Link
Sprinkler Frame: Brass Alloy
Button: Copper Alloy
Sealing Assembly: Nickel Alloy with PTFE
Load Screw: Bronze Alloy
Deflector: Bronze Alloy
Sprinkler Finishes
(See Table H)
Sensitivity
Quick-response
Temperature Ratings
165°F (74°C)
212°F (100°C)
Recessed Escutcheons/Cover Plates
Model FV recessed escutcheon
Model FP recessed escutcheon
Model CCP cover plate
Sprinkler Wrenches
Model D (pendent)
Model GFR2 (recessed and concealed)
Listings and Approvals
cULus Listed
Model LT56L-300 Sprinkler Components and Dimensions Figure 4
Model LT56L-300 Sprinkler Hydraulic Design Criteria Table E
Minimum Flow and Residual Pressure
Max. Coverage Area
ft. x ft.
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
28 x 8
(8.5 x 2.4)
23
(87)
16.9
(1.17)
28 x 10
(8.5 x 3.0)
28
(106)
25.0
(1.72)
Note: For coverage area dimensions less than or between those listed above, use the minimum required flow for the next highest coverage
area for which hydraulic design criteria are stated.
Bulletin 058 Rev. B
November 2016
Page 5 of 10
www.reliablesprinkler.com

Model LT56C Specific Application Sprinkler SIN RA5994
Technical Specifications
Style: Flat Cover Plate Concealed Pendent
Threads: 1/2” NPT or ISO 7-1 R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 175 psi (12 bar)
Min. Spacing: 14 ft. (4.3 m)
Material Specifications
Thermal Sensor: Nickel Alloy Solder Link
Sprinkler Body: Brass Alloy
Levers: Bronze Alloy
Yoke: Brass Alloy
Sealing Assembly: Nickel Alloy with PTFE
Load Screw: Bronze Alloy
Towers: Copper Alloy
Pins: Stainless Steel
Deflector: Bronze Alloy
Cup: Steel
Sprinkler Finishes
(See Table H)
Sensitivity
Quick-response
Temperature Ratings
165°F (74°C)
212°F (100°C)
Cover Plate
Model G4
Sprinkler Wrench
Model FC
Listings and Approvals
cULus Listed
Model LT56C Sprinkler Components and Dimensions Figure 5
Model LT56C Sprinkler Hydraulic Design Criteria Table F
Minimum Flow and Residual Pressure
Max. Coverage Area
ft. x ft.
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
28 x 8
(8.5 x 2.4)
24
(91)
18.4
(1.27)
28 x 10
(8.5 x 3.0)
28
(106)
25.0
(1.72)
Note: For coverage area dimensions less than or between those listed above, use the minimum required flow for the next highest coverage
area for which hydraulic design criteria are stated.
Bulletin 058 Rev. B
November 2016
Page 6 of 10
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Type
Adjustment
Inch
(mm)
Maximum Face
of Fitting to
Ceiling(1)
Inch
(mm)
Minimum Face of
Fitting to
Ceiling(1)
Inch
(mm)
Maximum
Deflector
Distance Below
Ceiling Inch
(mm)
Minimum
Deflector
Distance Below
Ceiling Inch
(mm)
Cover Plate
Temperature
°F
(°C)
FV 1/2
(12)
7/8
(22)
3/8
(10)
1-3/4
(44)
1-1/4
(32) N/A
FP 1/2
(12)
1-1/2
(38)
1
(25)
1
(25)
1/2
(12) N/A
CCP
135
1/2
(12)
1-1/2
(38)
1
(25)
1
(25)
1/2
(12)
135°F(2)
(57°C)
CCP
165
1/2
(12)
1-1/2
(38)
1
(25)
1
(25)
1/2
(12)
165°F(3)
(74°C)
G4
135
3/4
(19)
2-1/4
(57)
1-1/2
(38)
1
(25)
1/4
(6)
135°F(2)
(57°C)
G4
165
3/4
(19)
2-1/4
(57)
1-1/2
(38)
1
(25)
1/4
(6)
165°F(3)
(74°C)
Table G
Recessed Escutcheon and Conical Concealed Cover Plate Dimensions
Notes:
1. Face of fitting to ceiling dimensions are based on nominal thread make up. Verify dimensions based on fitting and thread sealing method
prior to installation.
2. For use with 155°F (68°C) and 165°F (74°C) temperature rated sprinklers where the Maximum Ceiling Temperature does not exceed
100°F (38°C).
3. For use with 200°F (93°C) and 212°F (100°C) temperature rated sprinklers where the Maximum Ceiling Temperature does not exceed
150°F (66°C).
Bulletin 058 Rev. B
November 2016
Page 7 of 10
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Recessed Escutcheon and Concealed Cover Plate Diagrams Figure 6

Standard Finishes Special Application Finishes
Sprinkler(1) FV, FP(4)
Escutcheons
CCP, G4
Cover Plate Sprinkler FV, FP(3) Escutcheons
CCP, G4
Cover Plate
Bronze Brass Bright Brass Bright Brass Bright Brass
Chrome Plated Chrome Plated Chrome Plated Dull Chrome Dull Chrome Chrome Dull
White Polyester(3) White Polyester White Paint Black Polyester(3) Black Polyester Black Paint
Custom Color
Polyester
Custom Color
Polyester Custom Color Paint
Electroless Nickel
PTFE(3)
Electroless Nickel
PTFE
Notes:
1. Model LT56, LT56L, LT56-300, and LT56L-300 only.
2. Paint or any other coating applied over the factory finish will void all approvals and warranties.
3. cULus Listed Corrosion Resistant, Models LT56 (RA5814) and LT56-300 (RA5914) only.
4. The Model FP escutcheon assembly consists of an unfinished galvanized cup with a finished escutcheon ring.
Sprinkler, Escutcheon, & Cover Plate Finishes(2) Table H
Application
Model LT56 series sprinklers are cULus Listed Specific Applica-
tion sprinklers for use in Light Hazard corridors and hallways in
accordance with NFPA 13. The sprinklers are classified as Spe-
cial Sprinklers based on the maximum and minimum allowable
spacing, but shall otherwise be designed in accordance with the
requirements of NFPA 13 for Extended Coverage Pendent Spray
sprinklers. Model LT56 series sprinklers are quick-response sprin-
klers for use in Light Hazard occupancies only.
The sprinklers must be hydraulically designed using the minimum
flow and pressure specified in the Hydraulic Design Criteria ta-
bles in this Bulletin. Figure 7 outlines the maximum coverage area
of Model LT56 series sprinklers. Figure 8 identifies the sprinklers
that can be located adjacent to Model LT56 series sprinklers; note
that LT56 series sprinkler are not permitted to be installed with the
short coverage length oriented towards the short coverage length
of an adjacent LT56 series sprinkler. An example layout of Model
LT56 series sprinklers is illustrated in Figure 9.
escutcheons, and Model CCP cover plate, are the only recessed
escutcheons and concealed cover plate to be used with Mod-
el LT56, LT56L, LT56-300 and LT56L-300 sprinklers. The Model
G4 cover plate is the only concealed cover plate permitted for
use with the Model LT56C sprinkler. Use of any other recessed
escutcheon or cover plate will void all approvals and warranties.
Do not install Model FV and FP escutcheons or Model CCP and
G4 cover plates in ceilings that are positively pressurized with
respect to the occupied space below.
When installing Model LT56, LT56L, LT56-300, and LT56L-300
sprinklers use only the Model D wrench for pendent installations
and the Model GFR2 wrench for recessed pendent and concealed
installation. The Model LT56C sprinkler must be installed with the
Model FC wrench. Use of wrenches other than those specified
may damage these sprinklers.
Model LT56 series sprinklers must be installed with the frame arms
or towers perpendicular to the length of the corridor or hallway.
The deflector is marked with “<-28 FT->” to indicate the direction
of the 28 ft. (8.5 m) coverage length. Model LT56 series sprinklers
need not be installed with the frame arms or towers parallel to the
sprinkler pipe.
Recommended installation torque is 8-18 ft-lbs (11 – 24 N-m). Do
not tighten sprinklers over the maximum recommended torque.
Exceeding the maximum recommended torque may cause leak-
age or impairment of the sprinklers.
Do not install any glass bulb sprinklers where the bulb is cracked
or there is a loss of liquid from the bulb.
Glass bulb sprinklers have orange bulb protectors to minimize
bulb damage during shipping, handling and installation. Remove
the bulb protector at the time the sprinkler system is placed in
service for fire protection. Removal of the bulb protectors before
this time may leave the bulb vulnerable to damage. The required
sprinkler wrenches are designed to install sprinklers with bulb
protectors in place. Remove bulb protectors by undoing the clasp
by hand. Do not use tools to remove the bulb protectors.
Listings and Approvals
Listed by Underwriters Laboratories, Inc. and UL Certified for
Canada (cULus)
UL Listing Category
Sprinklers, Automatic and Open
UL Guide Number
VNIV
Installation
Model LT56 series sprinklers must be installed in accordance with
the requirements of the MFPA 13 for pendent sprinklers and may
also be installed as a recessed sprinkler or concealed sprinkler as
shown in Figure 6. The Model FV and FP recessed
Bulletin 058 Rev. B
November 2016
Page 8 of 10
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Coverage Area Figure 7
Adjacent Sprinklers Figure 8
Example Sprinkler Layout Figure 9
Bulletin 058 Rev. B
November 2016
Page 9 of 10
www.reliablesprinkler.com

Guarantee
For the Reliable Automatic Sprinkler Co., Inc. guarantee, terms,
and conditions, visit www.reliablesprinkler.com.
Patents
Patent Pending
Ordering Information
Specify the following when ordering.
Sprinkler
• Model (LT56, LT56L, LT56-300, LT56L-300, LT56C)
• Temperature Rating
• Threads (1/2” NPT or ISO 7-1 R1/2)
• Finish (See Table H)
Escutcheon or Cover Plate
• Type (None, FV, FP, CCP, G4)
• Finish (See Table H)
Sprinkler Wrench
• Model D (LT56, LT56L, LT56-300, LT56L-300 Pen
dent)
• GFR2 (LT56, LT56L, LT56-300, LT56L-300 Re-
cessed or Conical Concealed)
• FC (LT56C Flat Concealed)
Maintenance
Reliable Model LT56 series sprinklers should be inspected and
the sprinkler system maintained in accordance with NFPA 25,
as well as the requirements of any Authorities Having Jurisdic-
tion.
Prior to installation, sprinklers should remain in the original car-
tons and packaging until used. This will minimize the potential
for damage to sprinklers that could cause improper operation
or non-operation.
Do not clean sprinklers with soap and water, ammonia liquid or
any other cleaning fluids. Remove dust by gentle vacuuming
without touching the sprinkler.
Replace any sprinkler which has been painted (other than facto-
ry applied). Properly installed Model CCP and Model G4 cover
plates will have an air gap that is required for proper operation,
do not seal the gap or paint the cover plates. Model FV and FP
escutcheons as well as Model CCP and Model G4 cover plates
have holes in the ring or cup that must remain unobstructed.
Replace any sprinkler which has been damaged, cracked the
glass bulb, or has lost liquid from the glass bulb. A stock of
spare sprinklers should be maintained to allow quick replace-
ment of damaged or operated sprinklers.
Failure to properly maintain sprinklers may result in inadvertent
operation or non-operation during a fire event.
Bulletin 058 Rev. B
November 2016
Page 10 of 10
www.reliablesprinkler.com
Model LT56, LT56L, LT56-300 and LT56L-300 Sprinklers Model LT56C Sprinklers
P/N 9999970493
Wrench Options
Model D Model GRF2 Model FC