FOR YOUR SAFETY
“WHAT TO DO IF YOU SMELL GAS”
• Do not touch any electrical switch; do not use any
• If you cannot reach your gas supplier, call the re
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS BEFORE INSTALLING OR OPERATING THIS CONTROL COULD
This control must be installed or serviced only by a 1.
Do not use force when moving the gas control knob. If you 2.
cannot turn the knob with hand pressure only, the control
must be replaced.
Do not use the control if the knob will not “pop up” after 3.
being depressed while the knob is in the PILOT position.
The mechanism is damaged and the control must be
replaced. Shut off gas to the water heater.
For your safety, this control is supplied with tamper 4.
resistant screws. Do not attempt to repair or adjust the
control. If you experience problems, replace the control
An odorant has been added to the gas to help you detect 5.
it. Before lighting, search for the odor of gas by snifﬁng at
ﬂoor level around the water heater.
In some situations, the gas may lose its odor. To detect 6.
unodorized gas, you must have a gas detector which can
be purchased from your gas company. If you do not have a
detector and have the slightest suspicion that gas may be
present, get out of the house and call the gas company. DO
NOT RELY TOTALLY ON YOUR NOSE.
Water Heater Thermostat Control
FOR NATURAL GAS ONLY
The main and pilot gas regulators require no ﬁeld service. They
automatically control and maintain the outlet main and pilot
burner gas pressure.
heater. Improper operation could occur, resulting in
personal injury and/or death due to Carbon Monoxide
dial will reduce the risk of scald and will reduce your
Model MainRegulator PilotRegulator Flange Outlet FlyingLeads
37C73U168 3.5" W.C. 4.0" W.C. 1-1/4" 42 KBTU/hr No Flying Leads
37C73U170 4.0" W.C. 4.9" W.C. 1" 38 KBTU/hr No Flying Leads
37C73U171 4.0" W.C. 4.0" W.C. 2-1/2" 40 KBTU/hr No Flying Leads
37C73U172 4.0" W.C. 4.0" W.C. 2-1/4" 40 KBTU/hr No Flying Leads
37C73U173 4.0" W.C. 4.0" W.C. 1-1/4" 45 KBTU/hr No Flying Leads
37C73U174 5.0" W.C. 5.0" W.C. 1-1/4" 37.5 KBTU/hr 11" Flying Leads