Use and Care Manual

38
▪ D. CH AND DHW PRESSURE RELIEF VALVES
An external pressure relief valve must be installed on this appliance for both the CH and DHW loops. When installing, observe the following
guidelines. Pressure relief valves must be installed as close to the appliance as possible. No other valves should be placed between the pressure
relief valve and the appliance. Failure to comply with these guidelines can result in substantial property damage, personal injury, or death.
This appliance has a high-temperature shut-off switch built in as a standard safety feature. Therefore, a “pressure only" relief valve is required. DO
NOT operate this appliance before the supplied pressure relief valve is installed with sufcient relieving capacity in accordance with the ASME rating
plate on the appliance.
CH Loop
This appliance is provided with a CH pressure relief valve that complies with the ANSI/ASME Appliance and Pressure Vessel Code, Section IV
(Heating Appliances). The included 30 psi CH Pressure Relief Valve must be installed on the CH supply line to ensure a compliant installation and
safe operation. The valve is meant to be eld installed. DO NOT install a CH pipe line relief valve with a pressure rating greater than 30 psi. This is
the maximum allowable CH relief valve setting for this appliance.
DHW Loop
This appliance must be installed with a DHW pressure relief valve that complies with local codes, but not less than valves certied as meeting the
requirements of Relief Valves for Hot Water Supply Systems, ANSI Z21/CSA4.4 by a nationally recognized lab that maintains periodic inspection of
production listed equipment. A DHW pressure relief valve is not included with the appliance, and is to be eld supplied and installed. DO NOT install
a DHW relief valve with a pressure rating greater than 150 psi. This is the maximum allowable DHW relief valve setting for this appliance.
After installing the relief valves and lling and pressurizing the system, test the operation of the valves by lifting the levers. Make sure the valves
discharge freely. If a valve fails to operate correctly, replace it with a new relief valve. Ensure that the maximum BTU/H rating on the pressure relief
valve is equal to or greater than the maximum input BTU/H rating of the combination appliance.
WARNING
WARNING
To avoid water damage or scalding due to relief valve operation:
• Discharge line must be connected to relief valve outlet and run to a safe place of disposal. Terminate the discharge line in a manner that will
prevent possibility of severe burns or property damage should the relief valve discharge.
• Discharge line must be as short as possible and the same size as the valve discharge connection throughout its entire length.Failure to follow
these directions will result in substantial property damage, severe personal injury, or death.
• Discharge line must pitch downward from the valve and terminate at least 6" above the oor drain, making discharge clearly visible.
• The relief line cannot be in contact with any live electrical parts.
• Discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of 375°F or greater.
• Do not pipe discharge to any location where freezing could occur.
• No shutoff valve may be installed between the relief valve and appliance or in the discharge line. Do not plug or place any obstruction in the
discharge line.
• Test the operation of the relief valve after lling and pressurizing the system by lifting the lever. Make sure the valve discharges freely. If the
valve fails to operate correctly, replace it with a new relief valve.
• Test relief valve at least once annually to ensure the waterway is clear. If valve does not operate, turn the appliance “off" and call a plumber
immediately.
• Take care whenever operating relief valve to avoid scalding injury or property damage.
• For appliances installed with only a pressure relief valve, the separate storage vessel must have a temperature and pressure relief valve
installed. This relief valve shall comply with Relief Valves for Hot Water Supply Systems, ANSI Z21.22/CSA4.4.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION, RESULTING IN
POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
Install wiring and electrically ground appliance in accordance with the authority having jurisdiction or, in the absence of such an authority, follow the
National Electrical Code, NFPA 70, and/or CSA C22.1 Electrical Code-Part 1 in Canada. Failure to follow all applicable local, state, and national
regulations, mandates, and building supply codes for guidelines to install the electrical power supply could result in property damage, serious
personal injury, or death.
PART 9 – CONNECT ELECTRICAL POWER / INITIAL STARTUP