FireBird Bio-Tec Manual page 31

Thermal safety valve
• In a closed (unvented) heating circuit installation a
thermal safety valve must be fitted to the Bio-Tec
boiler. This gives added protection in the unlikely
event that the Bio-Tec temperature safety switch
does not activate
• The Thermal safety valve (shown right) allows cold
mains water to pass through the upper part of the
boiler shell if the boiler temperature exceeds 95° C
To fit the thermal safety valve:
• insert tube (A) into the middle of the three ½"
fittings on the right hand side of the boiler (D)
• Connect the cold mains water to the lower fitting
(C) of the Thermal Safety Valve
• Connect the upper side of the Thermal Safety
Valve (B) to the ½" fitting nearest the front of the
boiler (D)
• Connect the last of the three ½" fittings to a
suitable drain outlet
A
D
B
C