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SECTION V: OPERATION (cont.)
INSPECT THE INSTALLATION AND ADJUST THE CONTROLS
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, adjust the setting on the control.
Press the COOLER and HOTTER buttons at the
same time and hold them for one second. Then,
press either the COOLER or HOTTER buttons
until the desired temperature display setting is
lit.
This log (or a similar one) should be filled out as
follows:
䊱
!
Date
Time
Person running test
Set temp °F
Outlet temp °F
APPROXIMATE
TEMPERATURE
( C)
o
DISPLAY
120 (49)
130 (54)
140 (60)
145 (63)
150 (66)
155 (68)
160 (71)
165 (74)
170 (77)
175 (79)
180 (82)
B
C
D
E
F
F
o
Figure 21:
Temperature and Display Settings
