Control Tapping Locations - Steam Boilers - Weil-McLain 94 Series Manual

Boiler manual: • Installation
Control tapping locations — steam boilers
Figure 11
Model 94 steam boiler control tappings
Item # Function
PRESSURE TEST GAUGE — REMOVE AFTER
J1
HYDROSTATIC TEST
J1 + J5 Gauge glass
J2 PLUG this tapping — not used
PLUG this tapping — not used
M3
M1 + M2
Float-type low water cutoff, LWCO/pump control or
LWCO/feeder combination
M3 + M4
P1 Skim tapping
P2 Steam pressure relief valve
R1 Skim tapping
R2 Steam pressure relief valve
Steam pressure gauge — or —
S1
Pressure controls (limit, operating, etc.)
S2 Pressure controls (limit, operating, etc.)
T1 or T2 Pressure controls (limit, operating, etc.)
Steam pressure gauge — or —
T3 or T4
Pressure controls (limit, operating, etc.)
Steam pressure relief valve — Install relief valve in
U1 or U2
one tapping and plug the other
Steam pressure relief valve — or —
V1 or V2
Skim tapping
Steam pressure gauge — or —
W1 or W2
Pressure controls (limit, operating, etc.)
W3 or W4 Pressure controls (limit, operating, etc.)
X1 & X2 PLUG these tappings — not used
X3 & X4 PLUG these tappings — not used
Y1 & Y2 Try cocks
Cleanout tappings — Front section — Install 2" NPT
Z1 or Z2
close nipple and 2" NPT cap in each cleanout tapping
Cleanout or drain tappings — Rear section —
Z3 or Z4 Install drain valve in one tapping; install 2" NPT x 2½"
length nipple and 2" NPT cap in the other
Low limit temperature control (when using tankless
heaters) — locate in control tapping on one of the tankless
—
heaters
Controls and fi ttings must not
obstruct cleanout openings or
prevent required access to the
boiler or components.
Part No. 550-110-275/1018
• Start-Up • Maintenance
Size
(Inches
NPT)
½
½
½
1
1
3
3
4
4
¾
¾
1¼
1¼
2
4
¾
¾
1¼
1¼
3 ⁄
8
2
2
—
• Parts
13