Unit installation

10
• If service is require for the hood portion of the drafthood/
damper drive assembly, they may be separated by unfastening
the three screws located in the cast iron base.
The flue damper must be in “OPEN” position when appliance pilot
and/or main burners are operating.
The top of the damper blade is visible when the damper is in the
“open” (vertical) position. The flue damper is intended to close
during heater “OFF” cycle (stand-by).
VENT REDUCER
The BTR(C) 250, 251, and 275 models are shipped with an 8" to
6" diameter flue outlet adapter. The BTR(C) 120 models come
with an 6" to 5" diameter flue outlet adapter. Each adapter fits on
top of the installed flue damper. Use only vent reducers supplied
with the unit. The venting must comply with the NATIONAL FUEL
GAS CODE, ANSI Z223.1/NFPA 54 and for Canadian installations
consult the Canadian Installation Code CAN/CGA B149.1 AND
.2.
FIGURE 7
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.
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 heaters. See table Vl
FOR TYPICAL VENTING APPLICATION.
This water heater must be vented in compliance with all local
codes, the current revision of the National Fuel Gas Code (ANSI-
Z223.1) and with the Category I Venting Tables.
In Canada, venting shall conform to the requirements of the current
CAN/CGA B149.1 or .2 installation code.
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.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while any
other appliances connected to the venting system are not in
operation.
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI Z223.1
or the CAN/CGA B149 Installation codes and these
instructions. Determine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which could cause
an unsafe condition.
3. So far as is practical, close all building doors and windows
and all doors between the space in which the water heater(s)
connected to the venting system are located and other spaces
of the building. Turn on all appliances not connected to the
venting system. Turn on all exhaust fans, such as range hoods
and bathroom exhausts, so they shall operate at maximum
speed. Close fireplace dampers.
4. Follow the lighting instruction. Place the water heater being
inspected in operation. Adjust thermostat so appliance shall
operate continuously.
5. Test for draft hood spillage at the relief opening after 5 minutes
of main burner operation.
6. After it has been determined that each appliance connected to
the 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.
7. If improper venting is observed during any of the above tests,
the venting system must be corrected.
WARNING
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS.
• If the back draft cannot be corrected by the normal method or
if a suitable draft cannot be obtained, a blower type flue gas
exhauster must be employed to assure proper venting and
correct combustion.
• 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.
CORRECT METHOD
OF VENT PIPE
INSTALLATION
INCORRECT INSTALLATION
WITH NO UPWARD
ANGLE
PROVIDE MAXIMUM VERTICAL RISE OF VENT PIPE DIRECTLY ABOVE
HEATER DRAFT HOOD BEFORE TURNING INTO HORIZONTAL RUN.
FIGURE 8
• 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.