Hydrolevel 450 Series User Manual
Page 2
A1
Connect input voltage (120 VAC, 60 HZ)
to terminals 1 and 2. 120 VAC, 60 HZ must be
supplied to terminals 1 and 2 for internal opera-
tion of the control.
+
0
LIMIT
CONTROLS
A
P2
P1
1
2
BURNER
CIRCUIT
HOT
NEUTRAL
FEEDER
OR ALARM
HOT
NEUTRAL
BURNER
CIRCUIT
A
P2
P1
1
2
BURNER
POWER
SOURCE
(24 or
120VAC)
BURNER
POWER
SOURCE
120VAC
A
P2
P1
1
2
FACTORY
INSTALLED
JUMPER
NEUTRAL
HOT
BURNER
POWER
SOURCE
120VAC
+
0
LIMIT
CONTROLS
A
P2
P1
1
2
HOT
NEUTRAL
BURNER
CIRCUIT
120VAC
A
P2
P1
1
2
REMOVE
JUMPER
NEUTRAL
HOT
+
0
LIMIT
CONTROLS
A
P2
P1
1
2
BURNER
CIRCUIT
HOT
NEUTRAL
BURNER
POWER
SOURCE
120VAC
+
0
LIMIT
CONTROLS
A
P2
P1
1
2
BURNER
CIRCUIT
WATER
FEEDER
WIRING METHOD A: SAME POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.
ᮤ
B1
Remove jumper between terminals 1
and P1. Connect input voltage (120 VAC,
60 HZ) to terminals 1 and 2. 120 VAC 60 HZ
must be supplied to terminals 1 and 2 for inter-
nal operation of the control.
Connect hot lead from the burner
B2
ᮣ
ᮣ
control circuit to terminal P1. This terminal sup-
plies power to terminal P2 in normal operating
conditions when water is at the probe. Connect
neutral to burner circuit. Note: consult boiler
manufacturer instructions for proper terminal
connections.
ᮤ
B3
Connect terminal P2 to burner circuit
in series with and before other limit controls.
Optional water feeder connection.
B4
ᮣ
ᮣ
Connect feeder H to terminal P1. Connect feeder
“FEED” or “W” to terminal A. Connect terminal
N to neutral of the burner circuit supply. For
feeders with two leads, connect feeder hot to
terminal A and connect feeder neutral to neutral
of the burner circuit supply. Note: Use of sole-
noid valve or McDonnell & Miller model 101A
water feeder may cause flooding and is not rec-
ommended for use with this low water cut-off.
A2
Connect terminal 2 to burner circuit neu-
tral. Connect terminal P2 to burner Circuit in
series with other limit controls. Consult boiler
manufacturer instructions for proper terminal
connections. Control should be wired in series
with and before other limit controls.
A3
Optional water feeder connection.
Connect feeder N to terminal 2. Connect Feeder
H to terminal 1. Connect feeder “FEED” or “W”
to terminal A. For water feeders with 2 leads,
connect feeder neutral to terminal 2 and feeder
hot to terminal A. Note: Use of a solenoid valve
or McDonnell & Miller Model 101A water feeder
may cause flooding and is not recommended
for use with this low water cut-off.
A1
A2
A3
B1
B3
B2
B4
WIRING METHOD B: SEPARATE POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.