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eXCessiVe Carbon monoXiDe eXposure Can Cause brain DamaGe or DeatH.
This pressure switch may control air flow into the combustion chamber. Improper adjustment of the pressure
switch in the field, or use of the switch for an application for which it was not intended, may introduce carbon
monoxide into the ventilation system.
Carbon monoxide is a dangerous, poisonous gas you cannot see or smell. Symptoms of carbon monoxide
exposure or poisoning include dizziness, headache, nausea, weakness, sleepiness, muscle twitching, vomiting
and inability to think clearly. If you experience these symptoms, turn the HVaC system off, leave the vicinity
of the building, and get into fresh air immediately. The pressure switch must be tested thoroughly by an
HVAC professional before the HVAC system is restarted.
remember:
• The U.S. Consumer Product Safety Commission warns that carbon monoxide gas is an "invisible killer."
Carbon monoxide gas is colorless, odorless and deadly.
• Carbon monoxide is produced by burning fuel, including natural gas and propane.
• Proper installation, operation and maintenance of fuel-burning appliances in the home is the most important
factor in reducing carbon monoxide poisoning.
• Be sure that fuel burning appliances, including HVAC systems, are installed by professionals according to
manufacturer's instructions and codes.
• Always follow the manufacturer's directions for safe operation.
• Have the HVAC system (including pressure switches) inspected and serviced annually by a trained service
technician.
• Examine vents regularly for improper connections, visible cracks, rust or stains.
• lnstall battery-operated carbon monoxide alarms. The alarms should be certified to the requirements of
the most recent UL, lAS and CSA standard for carbon monoxide alarms. Test carbon monoxide alarms
regularly and replace dead batteries.
If you have any questions regarding the installation, use or safety of this switch, please call Technical Service at
(800) 445-8299. This sensing switch must be installed, adjusted and serviced by a qualified HVAC installation
technician.
table 1: moDel seleCtion
p/n 2374-510 Kit
table 2: sprinG seleCtion
Color
Black
Natural
Yellow
Red
Blue
table 3: oriFiCe seleCtion
Color
Green
Gray
Red
Blue
Carbon monoXiDe Gas is DeaDlY
Bleed hole in Mounting Pan
set point range ("w.C.)
0.10 thru 0.30
0.30 thru 0.90
0.90 thru 2.50
2.50 thru 5.00
5.00 thru 10.00
Diameter
0.010
0.016
0.028
0.035
Fig. 2. Without pressure applied to the diaphragm,
switch contacts are in the position shown.
Fig. 3. Standard integral connector accepts
ID tubing.
⁄
3
"
16
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