Condensate Piping - A.O. Smith BTX 100 Instruction Manual

54) or the Natural Gas and Propane Installation Code (CAN/CSA
B149.1) whichever applies. Copper or brass tubing and fittings
(except tin lined copper tubing) shall not be used.
If the gas control valve is subjected to pressures exceeding 1/2 psi
(3.5 kPa), the damage to the gas control valve could result in a fire
or explosion from leaking gas.
If the main gas line Shut-off serving all gas appliances is used,
also turn "off" the gas at each appliance. Leave all gas appliances
shut "off" until the water heater installation is complete.
A gas line of sufficient size must be run to the water heater. Consult
the current edition of National Fuel Gas Code (ANSI Z223.1/NFPA
54) or the Natural Gas and Propane Installation Code (CAN/CSA
B149.1) and your gas supplier concerning pipe size.
There must be:
• A readily accessible manual shut off valve in the gas supply line
serving the water heater, and
• A sediment trap ahead of the gas control valve to help prevent
dirt and foreign materials from entering the gas control valve.
• A ground joint union of proper size between the shut off valve and
control valve to permit servicing of the unit.
Be sure to check all the gas piping for leaks before lighting the
water heater. Use a soapy water solution, not a match or open
flame. Rinse off soapy solution and wipe dry.

condensate pIpInG

This water heater is a condensing unit and requires a drain to be
located in close proximity to allow the condensate to drain safely.
The condensate drains from the unit at the exhaust tee located at
the bottom of the unit (see figure 12). Condensate from this water
heater is mildly acidic. Please note that some local codes require
that condensate is treated by using a pH neutralizing filter prior to
disposal.
Caution must be used to ensure that the drain is free and clear of
debris and will not allow backflow through the condensate hose.
Consideration must be given to avoid freezing of the condensate
lines which could result in excessive build up of condensate inside
the water heater. Waterproof heat tape may be required to prevent
freezing of the condensate lines. Please ensure that the outlet of the
condensate drain does not create a slippery condition which could
lead to personal injury.
CONDENSATION WARNING: THIS WATER HEATER IS
A CONDENSING UNIT AND REqUIRES A DRAIN TO BE
LOCATED IN CLOSE PROXIMITY TO ALLOW CONDENSATE
TO DRAIN SAFELY. THE CONDENSATE DRAINS FROM UNIT
AT THE EXHAUST ELBOW LOCATED AT BOTTOM OF UNIT.
NOTE: IT IS IMPORTANT THAT THE CONDENSATE HOSE NOT
BE ELEvATED ABOvE THE EXHAUST ELBOW, SEE FIGURE
12. CONDENSATE BUILD-UP WILL BLOCk THE EXHAUST
OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.
the condensate drain line must be routed to a suitable drain. If
no floor drain is available or the drain is above the level of the
condensate line, install a condensate pump that is resistant
to the acidic condensate. these pumps are available from
local distributors. If the pump is not resistant to acidic water,
a condensate neutralizer must be used ahead of the pump.
when installing the drain line, note the following:
• Plastic pipe or tubing must be used to connect the condensate
drain to a suitable drain or condensate pump. Do not use copper
tubing, iron, or steel pipe for the condensate drain line.
• Condensate drain lines should be installed in conditioned areas
only. Drain lines installed in areas that are subject to freezing
temperatures should be wrapped with a nationally recognized/
listed heat tape and/or approved insulation for freeze protection.
Install per manufacturer's instructions.
• Do not common drain with the temperature and pressure relief
valve or the condensate line from an air conditioner evaporator
coil.
• Slope the condensate drain toward the inside floor drain or
condensate pump.
• The condensate drain line and connection to the drain piping
must comply with all local codes.
hIGh altItude InstallatIons
This high efficiency water heater is certified for use without
modification for an altitude of 10,000 feet (3,079 meters). Consult
the factory for installation at altitudes over 10,100 feet (3,079m).
Some gas utility companies derate their gas for altitude, making it
unnecessary to install high altitude orifices. Call the local gas or
utility company to verify BTU content.
Due to the input ration reduction at high altitudes, the output rating
of the appliance is also reduced and should be compensated for
in the sizing of the equipment for applications.
19
fIGure 12.