1-9
INSTALLATION
TANKLESS WATER HEATER 199
Removal of Existing Unit from Common Venting
When an existing appliance is removed from a common venting system, the
common venting system is likely to be too large for proper venting of the
appliances remaining connected to it.
For each appliance remaining connected to the common venting system, you
must follow the steps below. Before you begin, ensure that any other appliances
connected to the common venting system are not in operation.
••
Seal any unused openings in the common venting system.
•
Visually inspect the venting system for proper size and horizontal pitch, and
determine that there is no blockage or restriction, leakage, corrosion and
other deficiencies that could cause an unsafe condition.
•
Insofar as is practical, close all building doors and windows and all doors
between the space in which the appliances remaining connected to the
common venting system are located and other spaces of the building. Turn
on clothes dryers and any appliance not connected to the common venting
system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
•
Place in operation the appliance being inspected. Follow the lighting
instructions. Adjust the thermostat, so that the appliance operates
continuously.
•
Test for spillage at the draft hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or candle, or smoke from a
cigarette, cigar, or pipe.
•
After it has been determined that each appliance remaining connected to
the common venting system properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace dampers and any other gas-
burning appliance to their previous conditions of use.
•
Any improper operation of the common venting system should be corrected
so the installation conforms with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, and/or the Natural Gas and Propane Installation Code, CAN/
CSA B149.1. When resizing any portion of the common venting system, the
common venting system should be resized to approach the minimum size
as determined using the appropriate tables in Chapter 13 of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
NOTE
The flue gas temperature
sensor reports the current
flue gas exhaust temperature
to the unit’s controller. If
necessary, the controller
will reduce the input of the
tankless water heater to
meet the flue gas exhaust
temperature requirements of
PVC material. The controller
locks out the unit if this
temperature is exceeded, and
displays F003.
CAUTION
- The minimum wall thickness
for venting is 1
"
and the
maximum wall thickness for
venting is 14
"
.
- Do not connect this tankless
water heater to a chimney flue
serving a separate appliance
designed to burn solid fuel.
- The air intake fitting can be
moved to the left or to the
right of the exhaust fitting.