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Weil-McLain 94 Series 3 Water and steam boilers — for Gas, Light Oil, & Gas/Light Oil-Fired Burners
12 Part No. 550-110-275/1018
Control tapping locations — water boilers
Figure 10 Model 94 water boiler control tappings
Item # Function Size
(Inches
NPT)
J1
PRESSURE TEST GAUGE — REMOVE AFTER
HYDROSTATIC TEST
½
J1 Temperature control or limit
½
J2 & J5
PLUG these tappings — not used on water boilers
½
M3 Probe-type low water cutoff
1
M1 + M2
Float-type low water cutoff or LWCO/feeder
combination
1
M3 + M4
P1 or R1 Temperature control or limit
3
S1 P/T gauge or temperature gauge
¾
T1 or T2
Temperature control or limit — or —
Air vent piping to compression tank
1¼
U1 & U2
Pressure relief valve(s):
894–2094: Install relief valve in one tapping and plug
the other tapping
2194–2594: Install a relief valve in each tapping
(2 relief valves required on these boilers)
2
V1 Temperature control or limit
4
W1 or W2
Temperature control or limit — or —
P/T gauge or temperature gauge
¾
X1 or X2
Temperature control or limit — or —
Air vent piping to compression tank
1¼
Y1 & Y2
PLUG this tapping — unless needed for a control
3
⁄8
Z1 or Z2
Cleanout tappings — Front section — Install 2" NPT
close nipple and 2" NPT cap in each cleanout tapping
2
Z3 or Z4
Cleanout or drain tappings — Rear section —
Install drain valve in one tapping; install 2" NPT x 2½"
length nipple and 2" NPT cap in the other
2
—
Low limit 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.
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