24
WIRE DIAGRAMS
Figure 16 - Isolation Relay Wiring For Steam Boilers With Probe Type Low Water Cut Off And Using An
Electronic Thermostat - Optional
TO BLOCKED
VENT SWITCH
C
R
W
Figure 17 - Water Feeder Connection - Optional
Optional water feeder connection.
• Connect feeder N to terminal 2.
• Connect feeder H to terminal 1.
• Connect "FEED" or "W" to terminal A.
• For water feeders with 2 leads, connect feeder
common to terminal 2 and feeder hot to terminal A.
Note:
Use of a solenoid valve or McDonnell & Miller
Model 101A water feeder may cause fl ooding and is not
recommended for use with this low water cut-off.