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Table IV: Purpose of Tappings
TAPPING SIZE
STEAM BOILER
A
4"
Supply
B
3"
Return
C
3"
Safety Valve
D
1½"
Crown Inspection / Washout *
E1
1"
Float L.W.C.O.
E2
1"
Float L.W.C.O.
Upper Auxiliary Float
F1
1"
L.W.C.O. Connection *
Lower Auxiliary Float
F2
1"
L.W.C.O. Connection
G
¾"
-----
H
¾"
-----
J
¾"
Firing Rate Pressure Control
Operating Pressure
K1
¾"
Limit Control
High Pressure Limit Control/
K2
¾"
Manual Reset
L
½"
Gauge Glass
M
½"
Steam Gauge (Bush to ¼")
N
¾"
-----
P
¾"
Low Fire Hold Control
* Special Order Only
combinations of LWCO's, consult factory. Also
follow manufacturers instructions furnished with
control.
3. Install the Pressuretrol to the boiler using the 1/4"
x 90° (1-7/8" x 4") siphon and the 3/4" NPT x 1/4"
FPT hex bushing.
4. The Pressuretrol must be accurately leveled for
proper operation. It is level when the leveling
indicator hangs freely with its pointer directly over
the index mark inside the back of the case. Level
the controller by carefully bending the steam trap
(siphon loop).
5. Install drain valve supplied by others in tapping B
using the appropriate bushing
34
Figure 29: Purpose of Tappings
WATER BOILER
Supply
Return
Relief Valve
Crown Inspection / Washout *
Float L.W.C.O.
Float L.W.C.O.
-----
-----
Probe L.W.C.O.
Auxiliary Probe L.W.C.O.
Firing Rate Temperature Control
Operating Temperature
Limit Control
High Temperature Limit Control/
Manual Reset
Not Used - Plug
Temperature/Pressure Gauge
Auxiliary Tapping *
Low Fire Hold Control
6. Install the steam gauge using the 1/2" NPT x 1/4"
FPT hex bushing.
7. Install the safety valve to the back section as shown
in Figure 43. The safety valve is installed in the tee
provided for blowoff piping.
Safety valve discharge piping must be piped
to within six (6) inches of floor or to floor drain
to eliminate potential of severe burns. Do not
pipe in any area where freezing could occur. Do
not install any shut-off valves, plugs or caps in
discharge piping.
La tuyauterie de décharge de la soupape de
sécurité doit être raccordée à moins de six (6)
pouces du plancher ou au drain de plancher
pour éliminer le potentiel de brûlures graves. Ne
pas installer de tuyaux dans des zones où le gel
pourrait se produire. Ne pas installer de vannes
d'arrêt, de bouchons ou de capuchons dans la
tuyauterie de refoulement.
8. For boilers with tankless heaters, install the
operating control in an unused tapping through one
of the heater plates.
9. Plug extra tappings.
J.
WATER BOILERS - INSTALL WATER TRIM
Items for water trim are located in the water trim carton
(except for the separately ordered low water cutoff,
tankless heater control and Sage SBC Parts carton).
Table IV and Figure 29 shows the proper tappings for
each item.
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