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OEM Factory Replacement Samson draft regulator. Intended to be installed by a qualified technician.
3/4" NPT Connection
Samson Draft Regulator Type 5 D - Flow temperature control in hot water boilers using solid fuels. Horizontal or vertical installation. Type 5 S - Same as Type 5 D - Additional closing of the fire.
Samson Draft Regulator Type 5 D - Suitable for vertical or horizontal installation. The red figures on the set point adjustment knob apply for horizontal installation, where as the white figures apply for vertical installation.
The thermowell contains the liquid-filled thermostat which senses the flow water temperature in the boiler. A pin fastened to the bottom of the metal bellows projects from the thermostat and is fixed inside the temperature adjustment knob. The system consisting of thermostat and pin is pressed against a bearing in the rotary knob by a spring. This mechanism allows set point adjustment.
The thermostat is connected to a pivot joint where the actuating lever for damper control is screwed on. The force of the spring is calculated such that the weight of the control damper is balanced and does not change the plug position. The spring also acts as an excess temperature device.
When the flow temperature rises, the liquid contained in the temperature sensor expands, forcing the thermostat downwards since the pin is fixed inside the rotary knob. The pivot joint is moved, the actuating lever is turned axially and the chain closes the damper. In this way, energy supplied to the boiler is reduced, causing the boiler temperature to fall.
If the flow temperature decreases, the damper opens as described above in accordance with the adjusted set point. The temperature set point can be changed by turning the set point adjustment knob. When turning the knob, the thermostat and the pin are moved axially. Adjustment of a higher set point temperature, for example, will cause the damper to open until the temperature has reached the adjusted set point.
NOTE: Samson 5 D may be substituted with Danfoss ESBE ATA Self Contained Thermostatic Expansion Draft Regulator.
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