SAFETY PRECAUTIONS
1. Install all ceramic brick and completely assemble the
heating system before energizing the system to avoid
damage to the heating system.
2. DO NOT use or store materials that may produce
explosive or flammable gases near this heating system.
3. Maintain all placement and clearance requirements as
specified in this manual to ensure proper operation and
safety.
4. Keep the top of the heating system free of debris and
other objects.
5. Disconnect power to all circuits before servicing. This
heating system may be connected to more than one
branch circuit.
6. Installation of and/or service to this heating system
should be performed by a qualified technician in compli-
ance with information contained herein and with national,
state, and local codes and requirements.
7. A repeated message of CORE FAIL indicates a need
for service by a qualified technician.
BUILT-IN SAFETY DEVICES
The Comfort Plus heating system incorporates safety devices to ensure normal operating temperatures are main-
tained. The chart below describes these safety devices.
DEVICE NAME
FUNCTION
LOCATION
ON SYSTEM
Core Charging High
Limit Switches
(Auto Reset)
These limit switches monitor brick core charging and
interrupt power to the heating elements if the normal
operating temperature is exceeded.
This limit switch monitors the discharge air temperature
and interrupts power to the core blower(s) if the normal
operating temperature is exceeded:
3100 Series = 130
o
F (nominal)
4100 Series = 170
o
F (nominal)
Core Blower
Limit Switch
(Auto Reset)
This limit switch monitors the discharge air temperature
and interrupts power to both the supply air blower and the
core blower(s) if the normal operating temperature is
exceeded:
3100 Series = 160
o
F (nominal) Auto Reset
4100 Series = 190
o
F (nominal) Manual Reset
Supply Air Blower
Limit Switch
Base Temperature
Limit Switch
(Auto Reset)
This limit switch monitors the temperature in the base of the
Comfort Plus and interrupts power to the core blower(s) if
the normal operating temperature is exceeded.
In the base of the
system near the core
blower(s).
In the limit bar panel
on the left side of the
brick storage cavity.
3100: In the discharge
air supply outlet.
4100: On the dis-
charge air
supply blower.
3100: In the discharge
air supply outlet.
4100: On the dis-
charge air
supply blower.
Comfort Plus
Safety Information
WARNING
Hazardous Voltage: Risk of
electric shock. Can cause injury
or death. This heater may be
connected to more than one
branch circuit. Disconnect
power to all circuits before
installing or servicing. Installa-
tion of and/or service to this
equipment MUST be performed
by a qualified technician.
Risk of fire. Can cause injury or
death. Violation of the clear-
ance requirements can cause
improper operation of the
equipment. Maintain the place-
ment and clearance require-
ments specified.
