GAS SPILLAGE SENSING KIT
Model: GSK-3, GSK-4, GSK-250M
Installation of a spillage SAFETY Switch is recommended for LP and Natural gas fired systems with draft
hoods, draft diverter, or gas barometric draft controls. This device is installed to detect flue gas spillage
caused by a blocked flue system and/or inadequate draft. This device MUST be installed by a qualified
installer in accordance with the manufacturer's installation instructions. Wiring MUST be in accordance
with the National Electrical Code and applicable local codes.
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 Spillage Switch
LOAD RATING
CONTACT
MATERIAL
SWITCH
TYPE
MODEL
P/N
SETPOINT °F RESET
APPLICATION
AMPS VOLTS
GSK-3
GSK-4
46086400
46086402
46086404
GOLD
24VA
24VA
24VA
mV-24AC
mV-24AC
mV-24AC
180
200
250
MANUAL
MANUAL
MANUAL
SPST NC
SPST NC
SPST NC
Gas-fired mV or 24VAC
Gas-fired mV or 24VAC,
where slower response
time is a requirement
Steam Boilers
GOLD
GSK-250M
SILVER
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DRAFT CONTROLS (See Figures 7 & 8)
NOTE: GSK style switches are designed for draft control models 4" MG1 through 9"
MG1. Larger size draft controls require the FTS Series switches.
1. Locate the spill switch along the bottom edge of the draft control ring. (See Figure 7)
Mark and drill a 5/32" dia. hole through the ring.
2. Mount the switch with the supplied #5-40 machine screw and nut. Note, the head of
the screw is to be on the inside of the ring. (See Figure 8)
3. Swing the gate to make sure the gate does not hit the screw head or the switch.
NOTE: Mounting the spill switch on the top of the draft control ring will function properly,
but will react slower during a blocked flue condition. If GSK switch(es) are supplied in a
draft control kit, install the switches as directed in the kits instructions.
Figure 7
WIRING
CAUTION: When wiring the spillage switch into
the burner circuit route the wiring and secure
away from any hot surface. Shut off all
electrical power and gas supply to the
appliance before working with any electrical
connections.
24 VOLT APPLICATIONS
1. Disconnect the hot lead between the
thermostat or temperature control and the
TH terminal on the gas valve or the TH,TH-
W or 24V terminal on the ignition module.
Check the thermostat anticipator (if
applicable) circuit for proper setting.
Figure 8
CAUTION: Never wire to the 24V GND
terminal.
2. Wire the spill switch or switches into series
with this circuit by wiring from the
thermostat or temperature control to the
spill switch or switches then to the gas
valve or ignition module. (See Figure 9 &
10)
Figure 9
Figure 10
Page 3
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750 MILLIVOLT PILOT GENERATOR APPLICATIONS
1. Disconnect the hot lead between the thermostat and the TH
terminal on the gas valve. On older bleed tube style
equipment split one lead of the E.C.O. (energy cut off)
circuit.
2. Wire the spill switch or switches into series with this circuit
by wiring from the thermostat to the spill switch or switches
then to the TH terminal on the gas valve. On older bleed
tube style equipment wire switches in series with one wire
of the E.C.O circuit. (See Figure 11)
30 MILLIVOLT WATER HEATER:
Two (2) switches are recommended for this application. The
application requires a TCA-1 Thermal Couple Junction block
(P/N 46082700 NOT INCLUDED) and a 6 foot length of 12 ga.
two (2) wire conductor (NOT INCLUDED) to wire between the
spill switches and the TCA-1.
Figure 11
CAUTION: Shut off gas supply before working on appliance.
1. Remove thermocouple from gas control valve. (See Figure
12)
2. Thread the junction block into the thermocouple port and thread
the thermocouple into the bottom of the junction block.
3. Mount the two (2) spill switches onto the draft hood so the
switches do not contact any metal. (See Figure 13)
4. Connect the one terminal of each switch with 12 ga wire and then
connect it to the thermocouple junction block. Next,connect the two
remaining terminals together using a short length of 12 ga wire.
(See Figure 14)
Figure 12
5. Route and secure the wires to the water heater enclosure with acceptable hold down
tabs, keeping the wires away from any hot surface area.
SYSTEM CHECK-OUT PROCEDURE FOR GAS SPILLAGE SWITCH CONTROL
1. Shut off gas supply to appliance(s).
2. Block the flue pipe above the draft control, draft hood or draft diverter.
3. Re-establish gas supply to appliance and re-light pilot (if required).
4. Adjust thermostat to call for heat.
Figure 13
5. Flue gases should be emitting from draft control, draft diverter or draft
hood. Note the location of the most flue gas spillage. Allow
approximately 2 minutes for the system to back up and the gas burner
to shut down. Wait 2 to 3 minutes, reset switches, and re-light pilot. If
the spillage switch does not trip within the 2 minute period, relocate the
switch onto the area where the observed highest spillage occurred.
Then perform this test again.
CAUTION: If for any reason the system has shut down during normal
operation, the cause of the system failure should be investigated and
corrected before resetting the safety switch and relighting the pilot.
Figure 14
P/N 46086300 Rev D 10/08
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