10
The water temperature is controlled by a thermostat, fig. 17, which has
two sensing elements. One sensor is located near the top of the tank and
the other is near the center. The thermostat is set in the lowest position
before the heater leaves the factory.
The thermostat temperature dial, fig. 17, is accessible by taking off the
access cover and removing the control cover. The dial is adjustable and
may be set for 120°F (48.9°C) to 170°F (76.6°C) water temperature, but
120°F is the recommended starting point. It is suggested the dial be placed
in the lowest setting which produces an acceptable hot water supply. This
will always give the most energy efficient operation. The temperature
control has a 4F° (2.2C°)fixed differential.
HIGH LIMIT SWITCH (E.C.O)
The dual bulb controller (fig.17) contains the high limit (energy cutoff)
sensor. The high limit switch interrupts main burner oil flow should the
water temperature reach 195°F (90.5°C).
In the event of high limit switch operation, the appliance cannot be restarted
unless the water temperature is reduced by 20F° (11.1C°) (approx.) and
the high limit reset button on front of limit control (fig.17) is depressed.
Continued manual resetting of high limit control, preceded by
higher than usual water temperature is evidence of high limit switch
operation. Contact your dealer or servicer if continued high limit
switch operation occurs
.
DUAL-BULB THERMOSTAT (COVER REMOVED)
FIGURE 17.
BURNER CERTIFICATE (COMBUSTION TEST)
The Commercial Standard CS75 Oil Burner Certificate form must be filled
in and posted in the vicinity of the water heater.
Instructions for filling in certificate are on the back of the certificate. This
must be done by the installer at the time the heater is first operated. The
certificate is in the oil burner manual.
SELF-CLEANING HYDRO-CANNON
These units include a self-cleaning hydro-cannon installed in the front
water inlet. See figure 18. The hydro-cannon must be oriented correctly
for proper function. There is a marked range on the pipe nipple portion of
the hydro-canon, that must be aligned with the top of the inlet spud. A label
above the jacket hole has an arrow that will point to the marked portion of
the pipe nipple if the orientation is correct. If the arrow does not point within
the marked range on the pipe nipple, adjust the pipe nipple to correct. A
pipe union is supplied with the hydro-cannon to reduce the probability of
misaligning the hydro-cannon accidentally while tightening the connection
to the inlet water supply line. Improper orientation of the hydro-cannon can
cause poor performance of the heater and can significantly reduce outlet
water temperatures during heavy draws.
FIGURE 18.
• THERMOSTAT (adjustable) set for desired water temperature.
• It is suggested the thermostat be turned to the lowest setting which
satisfies the hot water requirements of the system. This helps
minimize scale formation in the heater.
• HIGH LIMIT (not adjustable, manual reset) factory set to cutout at
195° F (90.5°C).
• If the high limit is actuated, the safety primary control will cause the oil
burner to shut down. See SAFETY PRIMARY CONTROL, page 21.
• To reset the safety primary control, depress and hold the red button
on the control for 30 seconds until the LED flashes twice.
• Depress red button one time only. If burner does not operate after
depressing red button one time, call service man.
4. Turn on the oil burner electrical disconnect switch.
5. The heater will begin normal operation on the thermostat's "call for heat".
6. To turn the heater off, open the electrical disconnect switch. If the heater
is to remain inoperative for a long period of time, close the shutoff valve
on the oil supply line.
WATER TEMPERATURE CONTROL
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER
TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND
LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS
PERSONAL INJURY AND OR DEATH. THE TEMPERATURE AT WHICH
INJURY OCCURS VARIES WITH THE PERSONS AGE AND TIME OF
EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN, AGED
OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM.
NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR
TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR
DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.
THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE
GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES.
SETTING THE WATER HEATER TEMPERATURE AT 120°F (48.9°C)
WILL REDUCE THE RISK OF SCALDS.
Some states require settings at
specific lower temperatures.
Figure 16 shows the approximate time-to-burn relationship for normal adult
skin. Short repeated heating cycles caused by small hot water uses can
cause temperatures at the point of use to exceed the thermostat setting by
up to 20°F. If you experience this type of use, you should consider using
lower temperature settings to reduce scald hazards.
Water Temperature °F Time for 1st Degree Burn
(Less Severe Burns)
Time for Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
110
(normal shower temp.)
116
(pain threshold)
116
35 minutes
45 minutes
122
1 minute
5 minutes
131
5 seconds
25 seconds
140
2 seconds
5 seconds
149
1 second
2 seconds
154
instantaneous
1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
FIGURE 16.
Valves for reducing point-of-use temperature by mixing cold and hot water
are available. Also available are inexpensive devices that attach to faucets
to limit hot water temperatures. Contact a licensed plumber or the local
plumbing authority.
