Field Controls Switch GSK 250M User Manual

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  
 
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  
 
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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