Smithco ADMP 115 G, Инструкция по установке и руководство пользователя, Страница: 5 / 24

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1.2 TECHNICAL SAFETY EQUIPMENT
1.2.1. Gas control block
the heaters are equipped with a gas control block which
regulates the flow of gas to the burner. The gas control
block is equipped with a safety valve, gas control valve,
pilot light pressure control and burner control (on a
standard natural gas setting). The safety valve is
controlled by the millivoltage generated when the
thermocouple is heated by the permanent pilot. To
ensure improved ignition the gas control valve opening
mechanism is fitted with a delay (softlite).
1.2.2. Control box
Temperature control for the water heater is housed in
the control box. For safety purposes, heaters are always
filled with three thermostats: a control thermostat, a
high-limit thermostat and an overheat thermostat. The
desired water temperature is set with the control
thermostat. The overheat thermostat prevents the water
reaching too high a temperature.
Diagram 2- Control box ADMP-models
Should both control and high-limit thermostats
malfunction, the overheat thermostat will automatically
shut down the heater. The overheat thermostat breaks
the thermocouple circuit, which closes the safety valve,
cutting of the supply of gas to the pilot burner which
extinguishes the pilot light.
The control thermostat can be set at settings 1-4
(approx. 40ºC to 73ºC). the switch temperature of the
high-limit thermostat is 84ºC; the overheat thermostat
cuts in at 93ºC. The sensor for the control thermostat is
located at the level of the control box; the sensors for the
high-limit and overheat thermostats are located near the
top of the heater.
The control box is fitted with an ON/OFF switch (I/O).
At setting I, the gas control block is controlled on the
basis of heat demand from the control thermostat. At
setting O the heater is switched off.
1.2.3. Thermal Reflux Safeguard
The heater is equipped with a Thermal Reflux Safeguard
(TRS), which consists of a temperature sensor and
thermostat fitted to the draught diverter. The function of
the TRS is to switch off the heater if flue gases pass
through the draught diverter and enter the area in which
the heater is installed instead of being expelled via the
chimney.