Nelson GA-1935, Branch Sprinklers, Nelson Heat Trace Type CLT and LT Self-Regulating Heaters Installation Instructions

NELSON

™

INSTALLATION

HEAT TRACING FOR BRANCH SPRINKLER SYSTEMS

INSTRUCTIONS

DESCRIPTION

These are supplementary instructions specific to the installation of heating cable on branch sprinkler systems
and are to be used together with the installation and maintenance instructions for self-regulating heater ca ble
(GA-1765).

HEAT TRACING SYSTEMS RELATED TO FIRE PROTECTION SERVICE

For use with all wattages of CLT, LT heater cables at 120, 208, 240 and 277V.

For use in Fire Protection Service:

1. Use on insulated appropriately listed or certified steel schedules 5, 10, 20 and 40 standpipe and sprinkler
system pipe up to and including 6 inch size. Includes use on elbows. tees, flanges, hangers and valves a s
shown (see Nelson instruction booklet #GA-1765). Appropriately listed or certified fiberglass insulation with
a k-factor of 0.25-0.27 BTU-in / hr-°F-ft

2

@ 75oF (130-140 W/m-K @ 24oC) must be used. In locations that

may be exposed to moisture weatherproof cladding must be used.

2. For systems having piping which connects between buildings, in unheated areas, coolers or freezers where
the temperature is at or above -40

o

F (-40oC).

3. For use in Ordinary Hazard Occupancies only as specified in NFPA 13 the Standard for the Installation of
Sprinkler System. The system must comply with the obstruction requirements of NFPA 13 so that the
thermal insulation over the trace heating does not unacceptably obstruct the sprinkler or cover the wrench
boss.

4. Fire Suppression system heater circuits must be connected to monitoring equipment. A listed Power
Supervisory Relay with the appropriate voltage coil shall be connected in parallel prior to the heat tracing.
The output contacts of the Listed Fire Control Panel must have provisions for supervisory circuits.

5. For use with sprinkler heads with a minimum temperature rating of 155oF (68oC).

6. For proper selection of heating cable and connection kits refer to the Nelson Sprinkler Design Guide #GA-

2499.

Note: For Nelson Heat Trace Cable Installation see our Installation & Maintenance
Manual #GA-1765.

Branch – Short Sprig Up In Line Sprinkler

P.O. BOX 726  TULSA, OK 74101  TEL [phone]  FAX [phone]  www.nelsonheaters.com

GA-1935 Rev. 1

Sheet 1 of 3

May 2015

NELSON

™

INSTALLATION

HEAT TRACING FOR BRANCH SPRINKLER SYSTEMS

Tee-Splice Kit

INSTRUCTIONS

Branch – Long Length Insulation – Short Sprig Branch

Insulation – In Line Sprinkler

Insulation – Vertical Pendant Mounted Sprinkler Head

P.O. BOX 726  TULSA, OK 74101  TEL [phone]  FAX [phone]  www.nelsonheaters.com

GA-1935 Rev. 1

Sheet 2 of 3
May 2015