Lochinvar CH 100 CE, Инструкция по установке, пусконаладке, эксплуатации и техническому обслуживанию

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Working principle of the water heater
14 Instruction manual CH
2
gis
Temperature protection
2.4.4 Flue gas backflow safeguard
The flue gases are discharged to the outside via the draught diverter (33) and
the flue (22). To prevent the flue gases from flowing back into the boiler room,
the discharge ducting is monitored by a feature called the Thermal Reflux
Safeguard (TRS). This uses a flue gas thermostat (37) with a flue gas
thermostat sensor (34) that are located in the draught diverter. Under normal
circumstances this sensor will register the ambient temperature.
However, if the chimney is not drawing sufficiently (for example, due to a
blockage in the chimney), the flue gases will 'reflux' and flow back past the flue
gas thermostat sensor. The sensor will then detect an excessive temperature
and the flue gas thermostat will open. The demand will cease, and the burner
control will immediately stop the heating cycle. The flue gas thermostat will also
lock out. It must be manually reset before the appliance can resume operation .
2.5 Safety of the
installation
In addition to the appliance's standard built-in safety monitoring, the appliance
must also be protected by an expansion vessel, expansion valve, pressure
reducing valve, non-return valve and a T&P valve.
The use of an expansion vessel, expansion valve and/or pressure reducing
valve depends on the type of installation: unvented or vented.
2.5.1 Unvented installation
With an unvented installation, an expansion valve valve and expansion vessel
prevent the buildup of excessive pressure in the tank. This prevents damage
being caused to the enamelled coating (in the appliance) or to the tank. A non-
return valve prevents excessive pressure buildup in the water supply system.
This valve also prevents water from flowing backwards from the tank into the
cold water supply system. The pressure reducing valve protects the installation
against an excessively high water supply pressure (> 8 bar). These components
are fitted to the cold water pipe
(3.7 "Vented water connections") .
2.5.2 Vented installation
With a vented installation, excess pressure is taken up by the open cold water
head tank. The height of the head tank determines the working pressure in the
water heater, which may not exceed 8 bar. The installation must also be fitted
with a vent pipe from the hot water pipe, that opens into the cold water tank.
Ideally, the vent pipe should discharge into a separate tundish/drain or
otherwise to the open cold water head tank. The water heater should also be
fitted on the hot water side with a stop valve
(3.6.3 "Hot water side") .
Protection Description
High-limit thermostat If the high-limit thermostat sensor (39) detects a temperature greater than
84°C, the high-limit thermostat will open. The demand will cease, and the
burner control will stop the heating cycle until the high-limit thermostat closes
again. At that moment, the burner control resets the appliance, and the heating
cycle resumes. The high-limit safeguard serves to prevent overheating and/or
excessive formation of scale in the appliance.
Safety thermostat If the safety thermostat sensor (38) detects a temperature greater than 93°C,
the safety thermostat will open. The demand will cease, and the burner control
will immediately stop the heating cycle. A lockout error of the burner control
takes place. It must be manually reset before the appliance can resume
operation .