Tjernlund 950-2420 24SP200 Spillage Kit 8504056 Rev 1 03/97 - Manual

24SP200 SAFETY INTERLOCK SYSTEM (P/N 950-2420)
(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 Spill Switch circuits are “normally closed” and will not affect normal appliance operation. When con-
centrated spillage of combustion gases occurs from the draft hood, diverter or barometric control, the
Spill Switch circuit will open preventing burner operation.
PARTS LIST
QUANTITY DESCRIPTION
(2) Spill Switches with manual reset, 200 o F set point
(1) Wire routing packet
(1) 8” jumper wire
(1) 6’ 16/2 jacketed cable
INSTALLATION
1. Shut off fuel supply to the appliance.
2. Attach Spill Switches to draft hood (A1), diverter (A2) or barometric control (A3), see respective
diagram.
3. Attach 8” jumper wire to inside terminals of draft spillage sensing switches.
4. Attach leads of jacketed cable to outside terminals of spillage switches.
5a. 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).
5b. 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).
Using cable routing tabs from wire routing packet, attach 6’ cable to appliance maintaining a
safe distance from hot surfaces, e.g. appliance vent pipe and hot water pipes.
IMPORTANT:
Sensing area on underside of Spillage Switch should not come in direct contact with
metal surfaces. Sensing Switches should be mounted so they will sample temperature
of gas spilling from vent or chimney, not temperature of metal surface.
DIAGRAM A1
DIAGRAM B2
DIAGRAM B1
DIAGRAM A3
DIAGRAM A2
Spill Switch
Cables
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