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HIGH TEMPERATURE VENT LIMIT SWITCH
Items Included:
1) High temperature vent limit switch
2) 2-1/2 to 5-1/2 inch hose clamps
1) Tube of high temperature sealant
4) Wiring quick connect terminals (LS-140A)
Installation of a High temperature vent limit switch is recommended for LP and Natural gas fired power
vented and natural draft water heaters. This device is installed to limit the vent temperature in either
plastic pipe (140
up tanks and/or inadequate venting. Wiring MUST be in accordance with the National Electrical Code and
applicable local codes.
The Field Controls High temperature vent limit switch MUST be installed by a qualified agency in
accordance with the manufacturer's installation instructions.
The definition of a qualified agency is: any individual, firm, corporation or company which either in person
or through a representative is engaged in, and is responsible for, the installation and operation of gas
appliances, who is experienced in such work, familiar with all the precautions required, and has complied
with the requirements of the authority having jurisdiction.
Before and after adding this safety control on existing appliances, an installation inspection in accordance
with the National Fuel Gas Code 54, Z223.1 Appendix H should be performed and a combustion analysis
is recommended to determine the operating condition of the appliance.
CAUTION: Disconnect Electrical Power When Wiring High temperature vent limit switch
CONTACT
MODEL
P/N
MATERIAL
LS-140A
46564100
SILVER
LS-550A
46564200
SILVER
Models: LS-140A, LS-550A
0
F temperature limit) or B vent installations (550
LOAD RATING
AMPS
VOLTS
15 A
120 AC
15 A
120 AC
2630 Airport Road · Kinston, NC 28504
Phone: 252-522-3031· Fax: 252-522-0214
1) TCA-1 thermocouple junction block (LS-550A)
1) 6 foot length of 12/2 wire (LS-550A)
2) Wire hold down clips (LS-550A)
1) ROMEX connector
0
F temperature limit) caused by scaled
LIMIT
RESET
SETPOINT °F
140
AUTOMATIC
550
AUTOMATIC
www.fieldcontrols.com
SWITCH
APPLICATION
TYPE
SPDT
PLASTIC VENT APPLICATIONS
SPDT
B-VENT APPLICATIONS
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Related Manuals for Field Controls LS-140A
Summary of Contents for Field Controls LS-140A
- Page 1 Wiring MUST be in accordance with the National Electrical Code and applicable local codes. The Field Controls High temperature vent limit switch MUST be installed by a qualified agency in accordance with the manufacturer’s installation instructions.
- Page 2 INSTALLATION OF LS-140A SWITCH ON A POWER VENTED WATER HEATERS WITH PLASTIC PIPE 1. Disconnect Electrical Power to the water heater and shut off the gas supply to the water heater. 2. Drill a 5/16” diameter hole through the side of the plastic vent pipe at least 2-inches above the outlet connection on the power venter on the water heater (See Figure 1).
- Page 3 connectors on the solenoid valve and route the wires from the solenoid valve connections to the common terminal and the normally close (NC) terminal on the LS-140A limit switch (See Figure 8). Also route installers supplied green grounding wire from the LS-140A limit switch and connect to any convenient grounding surface at the gas valve.
- Page 4 Wiring the LS-550A Limit switch Wire the High temperature vent limit switch in accordance with the National Electrical Code, manufacturer's recommendations and/or applicable local codes. THE UNIT MUST BE GROUNDED WHEN WIRED TO ANY 120 VOLT CONTROLS. Check ground circuit to make certain that the unit has been properly grounded. The wiring should be protected by an over current circuit device rated at 15 amperes.