VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
This water heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will retard a free draft.
Type B venting is recommended with these water heaters.
This water heater must be vented in compliance with all local codes, the current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and with the Category I Venting Tables.
In Canada, venting shall conform to the requirements of the current edition of the CAN/CSA
If any part of the vent system are exposed to ambient temperatures below 35 degrees F (2 degrees C) it must be insulated to prevent condensation.
•Do not connect the heater to a common vent or chimney with solid fuel burning equipment. This practice is prohibited by many local building codes as is the practice of venting gas fired equipment to the duct work of ventilation systems.
•Where a separate vent connection is not available and the vent pipe from the heater must be connected to a common vent with an oil burning furnace, the vent pipe should enter the smaller common vent or chimney at a point above the large vent pipe.
FIGURE 2.
VENT CONNECTION
Vent connections must be made to an adequate stack or chimney. Size and install proper size vent pipe. Do not reduce pipe size to less than that of the blower outlet.
Horizontal runs of vent pipe must have a minimum upward slope toward the chimney of 1/4 inch per foot (2cm per meter). Dampers or other obstructions must not be installed in between the heater and the blower. Be sure that the vent pipe does not extend beyond the inside wall of the chimney.
Where a continuous or intermittent back draft is found to exist, the cause must be determined and corrected. A special vent cap may be required. If the back draft cannot be corrected by the normal methods or if a suitable draft cannot be obtained, a blower type flue gas exhauster must be employed to assure proper venting and correct combustion.
SINGLE TEMPERATURE
MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER
WARNING
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE TEMPERATURE REGULATION ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN
VACUUM RELIEF VALVE
*INSTALL PER LOCAL CODES.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A". STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO COLD WATER INLET
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
FIGURE 3.
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