Instruction manual

Page 14 Atmospheric Gas
SECTION V: OPERATION (cont.)
INSPECT THE INSTALLATION AND ADJUST THE CONTROLS
During the initial warm-up of the stored water, check for proper combustion by sampling
combustion gas at a point just below the exit of the flue. O
2
readings should be in the range of
4.5-5.0% with CO levels at 0 ppm. Both combustion chamber access panels and insulation
(placed between panels) shall be installed when performing the combustion test. O
2
readings
that greatly deviate from the specified range may lead to unsafe operating conditions. Factors
that can lead to O
2
levels outside of the specified range include inadequate or excess draft
caused by ambient conditions or venting, obstructions underneath the water heater
preventing sufficient flow of air to burner, and improper inlet or manifold gas pressures. For
natural gas, the manifold pressure is preset at 4.0” w.c. and the acceptable inlet pressure is in
the range of 5-14” w.c. For propane gas, the manifold pressure is preset at 10.0” w.c. and the
acceptable inlet pressure is in the range of 11-14” w.c. See the “Pre-Installation” section of this
manual for information on clearances, air supply, and venting.
The thermostat has been adjusted to 120°F at the factory. Wait until thermostat has shut off
gas to the main burner. Wait 30 seconds following shut-off of gas, then set thermostat to the
highest temperature. The main burner should relight. Set thermostat to the lowest
temperature; the main burner should go out. The thermostat should be adjusted to the
minimum setting that will meet the hot water needs of the homeowner or commercial
application.
CAUTION
There is a scald potential if the thermostat is set too high. The recommended temperature
setting for normal residential use is 120°F. If higher temperature settings are needed for
combined appliance applications or commercial use, an automatic tempering valve
must be installed on all domestic hot water lines.
MEASURING THE OUTCOMING WATER TEMPERATURE
The thermostat is factory set at 120°F for
domestic use. It is the responsibility of the
building owner to verify that the installer follows
the recommended quantitative testing for
measuring the outlet water temperature. To make
sure that the system works properly after installa-
tion and in the future, it is recommended that
the heater’s performance be measured and
monitored. Run water out of the tap nearest the
heater until it comes out warm. Using a
calibrated thermometer, take a measurement. If
the water is not at a suitable temperature for the
installation, have a qualified service person
adjust the temperature control. Contact Bock for
further information if needed.
This log (or a similar one) should be filled out as
follows:
䊱
!
Date Time Person running test Set temp °F Outlet temp °F
Figure 6: Approximate Temperature and
Dial Setting Relationship