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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
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 and
tankless heater control). Table IV and Figure 29 show
the proper tappings for each item.
1. Install the temperature pressure gauge.
2. Install the low water cutoff. Follow manufacturers
instructions furnished with controls.
3. Install the immersion well and mount the aquastat
onto the well.
Figure 2: 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
4. Install the drain valve supplied by others in
tapping B using the appropriate bushing.
5. Install the pressure relief valve as shown in
Figure 44.
6. Plug extra tappings.
K. BURNER INSTALLATION
Refer to burner manufacturer's installation manual
for proper installation, fuel piping, wiring, burner
adjustment and service instruction.
L.
PACKAGED BOILER
1. The packaged boiler comes on its own shipping
skid (see Figure 30) and the assembled block is
hydrostatically tested at the factory. Once the boiler
is in its final position, perform another hydrostatic
test at 1½ times the working pressure of the boiler.
The shipping skid can be used as a housekeeping
pad unless local codes say otherwise. All controls
are pre-wired down to the burner. If burner is
equipped with a lead lag panel, lead lag controls will
be shipped loose for header mounting. The power
can be supplied to the burner if equipped with a
control panel. If burner has no panel, the power is
supplied to the J-box on the front jacket.
2. SUPPLY CONNECTIONS - Removal of top
jacket is not required to connect the supply riser(s),
however one may find it easier. Refer to Figure(s) 31
and/or 32 for water boilers and Figure 37 for steam
boilers.
3. RETURN CONNECTIONS - The boiler is secured
to the shipping skid with U bolts and 3" shipping
nipples. REMOVE THE BOLTS AND NIPPLES.
Using 3" plugs and an appropriate pipe sealant,
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