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Figure 26a: Purpose of Tappings - Water Boilers
Tapping
Location
Size
Water Boiler
Tapping
Location
Size
Water Boiler
(in) (in)
A 4 Supply J2 1 Plug
B 4 Plug K 3/4 Probe L.W.C.O.
C 3 Return M 3/4
Operating Temperature
Limit Control
D 3
Plug (24-03 thru 24-11)
Return (24-12)
N 3/4
Hi Temperature
Limit Control/Manual Reset
E 3 Blow-Off / Drain Valve P 1/2 Plug
F 3 Plug Q 1/2
Temperature/Pressure Gauge
(Bush to 1/4")
G 1-1/2 Relief Valve S 3/4 Tankless Heater Control
J1 1 Plug T 3/4 Firing Rate Temperature Control