L-185 SAFETY INTERLOCK SYSTEM (P/N 950-2064)
(For Millivolt and 24 Volt Control Systems only)
This Safety Interlock System may be used on conventional chimney or Power Vented appliances
equipped with a draft hood, draft diverter or draft control.
PURPOSE
To provide a means for appliance shut-down in the event of flue blockage or down drafts.
OPERATION
The Linear Limit Spillage Sensor circuit is “normally closed” and will not affect normal appliance opera-
tion. When concentrated spillage of combustion gases occurs from the draft hood, diverter or barometric
control, the Linear Limit Spillage Sensor circuit will open preventing burner operation.
PARTS LIST
QUANTITY
DESCRIPTION
(1)
Linear Limit Spillage Sensor with manual reset, 185
o
set point and six foot cable
(1)
Linear Limit mounting packet
(1)
Wire routing packet
INSTALLATION
1.
Shut off fuel supply to the appliance.
2.
Attach Linear Limit Spillage Sensor to draft hood (A1), diverter (A2) or barometric control (A3),
see respective diagram.
3a.
WATER HEATERS:
Millivolt water heaters require the Tjernlund Model JA-1 P/N 950-0470, Thermocouple Junction
Adapter (ordered separately). Connect ends of six foot cable to spade connections on
Thermocouple Adapter, (see Diagram B1).
3b.
FURNACES AND BOILERS:
Splice ends of six foot cable in a series circuit between the thermostat and gas valve or burner
control, (see Diagram B2).
4.
Using cable routing tabs from wire routing packet, attach Linear Limit control cable to appli-
ance maintaining a safe distance from hot surfaces, e.g. appliance vent pipe and hot water
pipes.
NOTE:
DO NOT CUT THE COPPER CAPILLARY SENSING TUBE!! TO DO SO
WOULD DESTROY IT AND DISABLE THE APPLIANCE.
IMPORTANT:
Copper capillary sensing tube should not come in direct contact with metal sur-
faces. Linear Limit Spillage Sensor should be mounted so that capillary will sample
temperature of gases spilling from vent or chimney, not temperature of metal surface.
DIAGRAM A1
DIAGRAM B2
DIAGRAM B1
DIAGRAM A3
DIAGRAM A2
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
