Steffes 5140 Owner & Installers Manual - Manual (Page 3)

Safety PrecautionS
1. Install all ceramic heat storage brick before ener-
gizing the system. Failure to do so may result in
equipment damage.
2. Install the pressure relief valve provided before
operating this heating system.
3. Keep combustible materials away from this
system. Storing explosive or flammable materials
near this heating system can result in an explo-
sion or fire.
4. Follow all placement and clearance requirements
as specified in this manual. (Page 3.02)
5. Make sure nothing is placed or stored on top of
this system.
6. Disconnect power to all circuits before servicing
as this heating system may be connected to more
than one branch circuit.
7. Use caution when working around the heating
system as inlet and outlet piping can be very hot.
8. Installation of and/or service to this system should be performed by a qualified technician in compliance with
information contained herein and with national, state, and local codes and requirements.
9. A repeated message display of “CORE FAIL” indicates a need for service by a qualified technician.
Safety DeviceS
The Comfort Plus Hydronic incorporates safety devices to ensure normal operating temperatures are maintained.
The chart below describes these safety devices:
Comfort Plus Hydronic Safety Information
DEVICE NAME FUNCTION lOCATION
ON SYSTEM
Core Charging High
Limit Switches
(Auto Reset)
These limit switches monitor brick core charging and inter-
rupt power to the heating elements if the normal operating
temperature is exceeded.
This linear limit switch monitors the temperature of the
water in the exchanger and interrupts power to the core
blower if a water temperature of 250 o F is exceeded. If this
limit switch opens, contact a qualified service technician.
Heat Exchanger
Limit Switch
(Manual Reset)
In the limit zone on
the left side of the
brick storage cavity.
Inside base on left side.
This linear limit switch monitors the temperature of the
water in the exchanger and interrupts power to the core
blower if a water temperature of 225 o F is exceeded.
Outlet Water
Temperature Limit
Switch (Auto Reset)
Inside base on left side.
Pressure Relief Valve
Factory provided,
field installed to outlet
port of furnace.
If the water pressure exceeds 30 psig, the pressure relief
valve opens. Once water pressure of less than 30 psig is
achieved, the valve closes.
WARNING
Risk of explosion. Can cause injury or
death. Operating the system without the
pressure relief valve installed can cause an
explosion. Connect the pressure relief valve
in a vertical, upright position with the sup-
plied fittings. DO NOT modify this assembly.
DO NOT cap, plug, or otherwise obstruct the
outlet of the pressure relief valve.
Risk of fire. Can cause injury or death.
Violation of the clearance requirements
can cause improper operation of the equip-
ment. Maintain the placement and clearance
requirements specified.
Risk of personal injury. Plumbing and other
surfaces can be hot. Use caution when
working near the system.