Wayne P250 series, User Manual

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INSPECTION OF LIMIT CONTROL SWITCHES
Warm air furnaces (gravity and forced air) should be equipped with an automatic temperature limit control switch. Hot water
boilers (forced or gravity) should be equipped with an automatic temperature limit control switch. Steam or vapor boilers be
provided with means to guard against firing a dry boiler or one in which the water is dangerously low.
IMPORTANT: On installations where an oil burner is being replaced with a gas burner, the controls on the boiler or furnace will
have to be checked for compatibility with the gas burner. All controls should be checked to ensure that they operate properly
and that they are in good condition. In no case should any limit or safety control be bypassed or wired in such a manner that it
will result in unsafe operation of the burner or appliance. If the controls on the appliance are not compatible with the burn er
operation they should be replaced with the proper controls.
INSTALLATION OF THERMOSTAT
The thermostat should be installed on an inside wall and should be located in the natural circulating path of room air. Locat ions
which would expose the thermostat to cold air, or drafts from windows, door, or openings leading to the outside, or to air
currents from cold or warm air registers, or where the natural circulation of air is shut off such as behind doors, above or below
mantels, shelves or in corners, should be avoided. The thermostat should not be exposed to heat from nearby radiators,
lamps, rays of the sun or mounted on a wall near pipes, warm air ducts or chimney flue. Any hole in the plaster or panel
through which the thermostat wires pass should be sealed to prevent drafts. The maximum comfort to be obtained from any
automatic heating installation is dependent to a great extent upon the proper installation and adjustment of the room
thermostat.
FIGURE 12: T-T TERMINAL LOCATION
T-T TERMINAL
JUMPER WIRE
CONNECT
LINE
VOLTAGE