SAFETY PRECAUTIONS
1.
DO NOT energize this heating system while
disassembled or without the ceramic heat storage
brick in place.
2.
DO NOT operate this heating system without the
factory provided pressure relief valve in place.
3.
DO NOT use or store materials that may produce
explosive or flammable gases near the system.
4.
DO NOT violate the placement and clearance
requirements specified in this manual. (Page 3.02-
3.03)
5.
DO NOT place anything on top of the 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
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 supplied fittings. DO
NOT modify this assembly. DO NOT cap, plug,
or otherwise obstruct the outlet of the pres-
sure relief valve.
Risk of fire. Can cause injury or death. Viola-
tion of the clearance requirements can cause
improper operation of the equipment. Main-
tain the placement and clearance require-
ments specified.
Risk of personal injury. Plumbing and other
surfaces can be hot. Use caution when work-
ing near the system.
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 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 techni-
cian.
Heat Exchanger
Limit Switch
(Manual Reset)
In the limit bar panel
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.
