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AQUA PLUS indirect-fired water heaters — Product Manual
Hot Water Can Scald!
• Water heated to temperature for clothes washing,
dish washing and other sanitizing needs can scald
and cause permanent injury.
• Children, elderly, and infirm or physically handi-
capped persons are more likely to be permanently
injured by hot water. Never leave them unattended
in bathtub or shower. Never allow small children to
use a hot water tap or draw their own bath.
• If anyone using hot water in the building fits
the above description, or if state laws or local
codes require certain water temperatures at
hot water taps, you must take special precau-
tions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such
as an automatic mixing valve, at hot water
tap or water heater. Automatic mixing valve
must be selected and installed according
to valve manufacturer’s recommendations
and instructions.
• Water passing out of drain valves may be extremely
hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any person.
Protection must be taken against excessive tem-
perature and pressure! — Installation of a tem-
perature & pressure (T&P) relief valve (provided
with water heater) and a thermostatic mixing valve
(provided by installer) is required.
Water heater temperature adjustment
General notes
• Household water usage patterns will affect water temperature at
any faucet or shower.
• Occasionally check temperature at each point of use, then
adjust thermostat accordingly.
• Always recheck temperature after adjusting thermostat.
• When hot water is used in repeated small quantities, a “stacking”
effect can develop in hot water tank. The upper layer of water in
tank can be much hotter than lower layers.
• Lowering the thermostat setting or installing automatic mixing
valves as indicated in these instructions will reduce water tempera-
ture levels. Consult your installer or service technician.
At no time should boiler limit control be set above 200°F.
This can cause severe personal injury, death or substantial
property damage if ignored.
Studies have indicated that dangerous bacteria, includ-
ing legionella pneumophila, can form in the potable
water distribution system if certain minimum water
temperatures are not maintained. Contact your local
health department for more information.
Setting the thermostat
1. The water heater thermostat is factory set to its lowest temperature.
This may or may not be suitable for your needs.
2. Turn thermostat knob
clockwise to increase water tempera-
ture.
3. Turn thermostat knob
counter-clockwise to reduce water tem-
perature.
4. When decreasing temperature setting, the stored hot water must
be drawn off before checking temperature at faucet.
5. Check water temperature at a hot water faucet immediately after
first heating cycle. Further temperature adjustment may be neces-
sary as water heating system is used. Recheck water temperature
at faucet after adjustment.
6. When adjusting thermostat, be sure boiler limit control is set a
minimum 20°F higher.
Figure 20 Water heater temperature adjustment knob (on
lower front of water heater)
Part number GL-E223-ADOC 0311
24