John Wood Commercial - AJWS - Manual (Page 18)

Stacking
Stacking occurs when a series of short draws of hot water
are taken from the water heater tank. This causes increased
cycling of the burner and can result in increased water tem-
peratures at the hot water outlet. A tempering valve should
be installed in the hot water supply line to reduce the risk of
scald injury.
Water Temperature Regulation
The thermostat is adjusted to its lowest temperature setting
when it is shipped from the factory. Water temperature can
be regulated by moving the temperature dial to the pre-
ferred setting. The preferred starting point is 49°C (120°F)
Important: Since most commercial installations utilize high-
er temperatures, the use of a tempering valve is strongly
recommended in all domestic hot water lines (i.e. public
restroom sinks, etc). Auxiliary commercial equipment (i.e.
dishwashers, laundry equipment, etc.) may require higher
temperature settings. Refer to instruction manuals supplied
with this type equipment for recommended temperature set-
tings.
Important: Adjusting the thermostat past the 49°C (120°F)
setting on the temperature dial (see Figure 13) will increase
the risk of scald injury. Hot water can produce first degree
burns within:
49°C (120°F) more than 5 minutes
54°C (130°F) at 20 seconds
60°C (140°F) at 3 seconds
66°C (150°F) at 1-1/2 seconds
71°C (160°F) at less than 1 second
Each water heater consists of a mechanical temperature
stop set to 60°C (140°F). To set to a different setting remove
the temperature dial knob, loosen the shaft nut and re-posi-
tion the mechanical temperature stop. Tighten the shaft nut
and replace the temperature dial knob.
18
1. Turn off all electric power to the appliance if service is
to be performed.
2. Set the thermostat to lowest setting.
3. Turn the gas control knob clockwise to the “OFF”
position. Do not force.
1. STOP! Read the safety information above on this label.
2. Turn off all electric power to the appliance.
3. Set the thermostat to the lowest setting.
4. This appliance is equipped with an ignition device
which automatically lights the pilot. Do not try to light
the pilot by hand.
5. Turn the gas control knob clockwise to the “OFF”
position. Do not force.
6 . Wait ten (10) minutes to clear any
gas. If you then smell gas, STOP!
Follow “B” in the safety informa-
tion above on this label. If you
don’t smell gas, go to the next
step.
7. Turn gas control knob counter-
clockwise to “ON”.
8. Set thermostat to desired setting.
9. Turn on all electric power to the appliance.
10. If the appliance will not operate after three automatic
tries, follow these instructions once more. If the appli-
ance still refuses to light, follow the instructions "To
Turn Off Gas To Appliance" and call a qualified service
technician.
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
DANGER
Water temperature over 52°C (125°F) can cause
severe burns instantly or death from scalds.
Children, disabled and elderly are at highest risk of
being scalded.
Feel water before bathing or showering.
Temperature limiting valves are recommended.
Figure 13: Tempera-
ture Dial