John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 23)

23
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 11). 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 11.
Condensate build-up will block the exhaust outlet, which will cause
improper operation.
Figure: 11
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 10,100 feet (3,078 m). Consult the
factory for installation at altitudes over 10,100 feet (3,078 m).
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 rate reduction at high altitudes, the output rating
of the water heater is also reduced and should be compensated
for in the sizing of the equipment for applications.
FILLING THE WATER HEATER
Never use this water heater unless it is completely full of water.
To prevent damage to the tank, the tank must be filled with water.
Water must flow from the hot water faucet before turning ON gas
to the water heater.
To fill the water heater with water:
1. Close the water heater drain valve by turning the handle to the
right (clockwise). The drain valve is on the lower front of the
water heater.
2. Open the cold water supply valve to the water heater.
NOTE: The cold water supply valve must be left open when the
water heater is in use.
3. To insure complete filling of the tank, allow air to exit by opening
the nearest hot water faucet. Allow water to run until a constant
flow is obtained. This will let air out of the water heater and the
piping.
4. Check all water piping and connections for leaks. Repair as
needed.
Exhaust
Elbow