M3
CONDENSING WATER BOILER
25
34-1115 12/15
3. Follow the ETL, UL, ULC or CSA listed Polypropylene or listed single or double wall Stainless Steel, Category 4
positive pressure gas appliance vent system manufacturer’s instructions for installing, sealing, supporting and
terminating their vent system. Do not insulate plastic vent pipe.
4. Support the venting system following the venting system manufacturer’s installation instructions. The vertical
pipe must be supported to prevent putting excessive weight on the appliance vent connection.
5. Seal the vent pipe at the point where it passes through a wall or roof following the venting system
manufacturer’s installation instructions.
6. For proper vent operation and to protect the gas vent from wind and weather, attach vent system’s termination
(cap) following the listed venting system manufacturer’s installation instructions.
7. Test the completed venting system for leaks following the venting system manufacturer’s installation
instructions.
8. Do not use a barometric damper with the M3 venting system. Barometric dampers are designed for use with
certain Category I negative pressure vent systems. The M3 Category IV vent system operates with positive vent
pressure and will not operate safely with a barometric damper.
9 OPERATING AND SAFETY CONTROLS
9.1 Pressure Relief Valve(s)
A Pressure Relief Valve(s) sized in accordance with the ASME Boiler and Pressure Vessel Code, Section IV is
installed in the boiler.
WARNING: Secure the relief valve discharge pipe to a suitable floor drain such that very hot water does not
openly splash during a significant relief valve discharge. If the relief valve discharge pipe is not routed and
secured to a suitable drain, hot water discharge can result in property damage, scalding and personal injury
or death.
WARNING: Do not plug the relief valve(s), use discharge piping smaller than the relief valve opening or
install a reducing coupling, valve or other restriction in the relief valve discharge line. Failure to comply with
these relief valves and discharge piping requirements can prevent the relief valve from providing its
intended pressure protection, which can result in a sudden loss of pressure containment that can cause
property damage, exposure to hazardous materials, personal injury or death.
• Follow the relief valve manufacturer’s installation and operating instructions and all local regional and national
codes applicable to relief valve installation and discharge piping.
• The relief valve discharge pipe must not be smaller than the relief valve opening and must be secured to prevent
it from lifting out of the drain under discharge pressure and must be routed to allow complete drainage of the
valve and piping.
• Do not plug the relief valve(s) or install a reducing coupling, valve or other restriction in the relief valve discharge
line(s), as this will eliminate the critical water pressure protection it provides.
• Thermal Expansion - A relief valve that periodically discharges may result from thermal expansion. To control
these periodic discharges, the boiler system must be provided with means to control expansion. Contact a boiler
professional to resolve this situation.
9.2 Electronic Low Water Cut-Off
When the water level is above the electrode position in the tank, the reset pushbutton will energize the control (LED
will be lit). The control remains energized until the water level drops below the electrode position (LED will not be lit).
Unless otherwise specified, there is a three-second time delay on decreasing level. Water level must be below tank
probe location for full three seconds before control de-energizes. The Electronic Low Water Cut-Off is located in the
top head of the boiler.
IMPORTANT: Probe Sensitivity = 26K ohms (most water/glycol mixtures up to 50% concentration may be used).
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