Xylem MM 226C Series 69 Low Water Cut-Offs For Steam Boilers - Manual (Page 5)

BURNER
101A
120 VAC
SUPPLY N
H
24V
1 2
3 4 69
Wiring Alternatives - Controls of Different Voltages
For 120V Burner/24V Feeder setups For 24V Burner/120V Feeder setups
BURNER
101A-24
120 VAC
SUPPLY
24V TRANSFORMER
(101-24V-48)
TO AVOID DAMAGE TO 101A
SOLENOID COIL, TRANSFORMER
101-24V-48 MUST BE USED.
N
H
1 2
3 4 69
Wire only terminals 1 and 2 into the millivolt circuit. Do not
attach any other wiring to terminals 1 and 2.
Install wire (A) from water feeder to 120 volt Neutral wire.
Install wire (B) from water feeder to terminal 4 of the low
water cut-off.
Install wire (C) from terminal 3 of the low water cut-off to 120
volt Hot wire.
MILLIVOLT
BURNER
CIRCUIT
1 2
3 4
101A
FEEDER
A
B
C
120 VAC
SUPPLY
HOT
NEUTRAL
WIRE
NUTS
Models 69-MV-P and 369-MV Millivolt Burner Circuit Controls with Water Feeder
Millivolt Burner Control and Model 101-A 120V Water Feeder
24V TRANSFORMER
(101-24V-48)
1 2
3 4
101A-24
A
C
D
B
E
120 VAC
SUPPLY
WIRE
NUTS
MILLIVOLT
BURNER
CIRCUIT
Wire only terminals 1 and 2 into the millivolt circuit.
Do not attach any other wiring to terminals 1 and 2.
Install wire (A) from 120 volt circuit Neutral wire
to the transformer input Neutral terminal.
Install wire (B) from burner circuit Hot wire to the
transformer input Hot terminal.
Install wire (C) from transformer output Neutral
terminal to the water feeder.
Install wire (D) from the water feeder to terminal 4
on the low water cut-off.
Install wire (E) from terminal 3 on the low water
cut-off to the transformer output Hot terminal.
Millivolt Burner Control and Model 101-A 24V Water Feeder
To prevent damage to the water feeder, a McDonnell
& Miller transformer Model 101-24V-48 must be used.
! IMPORTANT
To prevent damage to the water feeder, a McDonnell
& Miller transformer Model 101-24V-48 must be used.
! IMPORTANT
5