Steffes DLF40B - Manual (Page 5)

DEVICE NAME FUNCTION
Safety Information
LOCATION
ON HEATER
SAFETY PRECAUTIONS
1. DO NOT energize the furnace while disassembled or without ceramic heat storage brick in place.
2. As is true with all heating appliances, materials that may produce explosive or flammable gases MUST NOT
be used or stored near the furnace.
3. Be sure the minimum clearance requirements specified in this manual are never violated.
4. This unit may be connected to more than one branch circuit. Disconnect power to all circuits before servicing.
BUILT-IN SAFETY DEVICES
All Steffes Double Loop Central Furnaces incorporate safety devices to ensure normal operating temperatures
are maintained. The chart below describes these safety devices.
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Core Charging High
Limit Switches These limit switches monitor brick core charging and will
interrupt power to the heating elements if the normal
operating temperature is exceeded. Each switch controls
two heating elements. In the limit bar panel
on the right side of the
brick storage cavity
This limit switch monitors the temperature in the heat
exchanger of the furnace. If the normal operating tempera­
ture is exceeded, this switch will interrupt power to the core
blower. Heat Exchanger High
Limit Switch In the base of the
furnace inside the
electrical panel
This limit switch monitors the discharge air temperature and
interrupts power to the core blower if this temperature
exceeds 160
o F (nominal).
Core Blower High
Limit Switch In the supply air
plenum assembly on
the blower
This limit switch monitors the discharge air temperature and
interrupts power to the supply air blower if this temperature
exceeds 180
o F (nominal).
Supply Air Blower
Limit Switch In the supply air
plenum assembly on
the blower
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The filter in the furnace should be replaced on a regular basis. General cleaning of the furnace’s cabinet should be
conducted at the user’s discretion. No additional routine maintenance is required.
Maintenance and Cleaning
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