AIR CONDITIONER/HEAT PUMP INTERFACE
The ThermElect Hydronic system can be used in conjunction with an air conditioner or a heat pump. Contact
Steffes for more information.
PRESSURE RELIEF VALVE INSTALLATION
1. Remove the exchanger access panel and locate
the pressure relief valve assembly.
2. Connect the pressure relief valve to the outlet
water port on the left side of the ThermElect
Hydronic. It is extremely important that the
following conditions for installation of this part
are met:
WARNING
Risk of explosion. Can cause injury or death. The factory supplied pressure relief valve MUST be connected
to the system with the supplied fittings.
• DO NOT modify this assembly.
• DO NOT cap, plug, or otherwise obstruct the outlet of the pressure relief valve.
• DO mount the pressure relief valve in a vertical, upright position.
• This pressure relief valve is sized to service the needs of the ThermElect
Hydronic heating system. If multiple heating systems are being used, pressure
relief valving for the other system MUST be provided separately.
3. Use schedule 40 pipe to install a discharge line for the pressure relief valve. This discharge line MUST:
Available
Pressure Relief
Valves
Minimum
BTU Rating
Maximum
Operating
Pressure
Order
Item #
30 PSI
400,000
20 PSI
1100104
75 PSI
500,000
60 PSI
1100105
150 PSI
500,000
125 PSI
1100106
• Insure all connections, including the valve
inlet are clean and free from any foreign material.
• Use pipe compound sparingly, or tape on external threads only.
• Mount the pressure relief valve in a vertical, upright, position directly to the outlet water port of the
system. Under no circumstances should there be a flow restriction or valve of any type between the
safety relief valve and the pressure vessel.
• Be connected from the valve outlet with no
intervening valve and directed downward to a
safe point of discharge.
• Allow complete drainage of both the valve and
the discharge line.
• Be independently supported and securely
anchored to avoid applied stress on the valve.
• Be as short and straight as possible.
• Terminate freely to atmosphere where any
discharge is clearly visible and is at no risk of
freezing.
• Terminate with a plain end that is not threaded.
• Be constructed of a material suitable for exposure to temperatures of 375
o
F or greater.
• Be, over its entire length, of a pipe size equal to or greater than that of the valve outlet.
CAUTION
Risk of injury or property damage. During operation,
the pressure relief valve may discharge large
amounts of steam and/or hot water. To reduce
the potential for bodily injury or property damage,
install a discharge line.
• DO use schedule 40 pipe for the discharge line.
• DO NOT use schedule 80, extra strong pipe or
connections on the discharge line.
• DO NOT cap, plug, or otherwise obstruct the
discharge pipe outlet.
• DO follow all local, state, and national codes
and regulations.
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