Lochinvar 000 through 2 - Manual (Page 76)

76
NOTE:
(1) This water heater, when set at the lower temperature
setting, is not capable of producing hot water of sufficient
temperature for sanitizing purposes.
(2) Higher stored water tem per a ture increases the ability
of the water heater to supply desired quan ti ties of hot
water, however remember-
Incorrect piping of the cold water supply to the system may result
in excessive low temperature operation causing condensate
formation on the primary heat exchanger and operational problems.
The cold water supply piping must be installed in the discharge
piping from the heater to the storage tank. This allows the cold
water to be tempered in the storage tank before entering the heater.
See typical in stal la tion drawings provided with the unit for
correct piping. Higher water temperatures reduce the volume of
condensate formed.
CAUTION
ƽ
Hotter water increases the risk of scald injury. Setting the
temperature selector to higher settings provides hotter water,
which increases the risk of scald injury.
The manufacturer recommends the use of a properly sized
thermostatic mixing valve to supply domestic hot water at
temperatures less than 110°F (43.3°C). Storing the water at a higher
temperature and thermostatically mixing the water will decrease
the size of the storage tank and increase the available quantity of
mixed hot water. Storing water at higher temperatures can help to
control the level of condensate formed and help prevent the growth
of water born bac te ria. Caution! Adequate care MUST be taken to
prevent potential scald injury when storing water at 140°F (60°C)
and hotter.
WARNING
ƽ
Should overheating occur or the gas supply fail to shut
off, do not turn off or disconnect the electrical supply to
the pump. Instead, shut off the gas supply at a location
external to the appliance.
HIGH WATER TEMPERATURE
LIMIT CONTROL
A Manual Reset High Limit control is located on the left front of the
left front side of the control panel, beside the Command Display.
Additional switches, alarm in di cat ing lights and optional low water
cut-off control switches are also located on this panel. The setting of
this con trol knob limits maximum discharge water temperature. The
water heater or hot water supply boiler temperature limit control is
adjustable up to a fixed maximum set ting of 200°F (93°C). A red
reset but ton, located beside the knob, must be pushed whenever water
temperature has exceeded the set point of the manual reset limit. The
temperature of the water in the heat exchanger must drop a minimum
of 15°F (8.3°C) below the setting of the manual reset high limit control
before the reset function can be activated. A red indicating light is
illuminated when the water temperature exceeds the set ting of the high
limit control. A sta tus point alarm of Over Temp will be displayed in
the Command Display when water temperature exceeds the Setpoint
Temperature programmed into the Excel 10 control.
OPTIONAL RELIEF VALVE
This water heater or hot water supply boiler is normally supplied with
a temperature and pressure relief valve sized in accordance with
applica ble codes. Units may be supplied with an optional pressure
only relief valve. When a water heater or hot water supply boiler
equipped with this optional relief valve is piped to a separate storage
vessel, the storage vessel must have a properly installed temperature
and pressure relief valve which complies with local codes.
THERMAL EXPANSION
A relief valve that discharges pe ri od i cal ly may be due to thermal
expansion in a closed system. A water heater or hot water supply
boiler installed in a closed system, such as one with a backflow
preventer or check valve in stalled in the cold water supply, shall be
provided with means to control ex pan sion. Contact the water supplier
or local plumbing inspector on how to correct this situation. Do not
plug or cap the relief valve discharge!
CATHODIC PROTECTION
Hydrogen gas can be produced in a hot water system that has not been
used for a long period of time (generally two weeks or more).
Hydrogen gas is ex treme ly flammable. To prevent the possibility of
injury under these con di tions, we recommend the hot water faucet be
open for several minutes at the kitchen sink before you use any
electrical appliance which is connected to the hot water system. If
hydrogen is present, there will be an unusual sound such as air
escaping through the pipe as the hot water begins to flow. There
should be no smoking or open flames near the faucet at the time it is
open.