Hydrolevel VXT-120 V2 - Manual (Page 2)

Step 3 Wiring
Select the wiring diagram below that corresponds to the low water cut-off installed on the boiler. Consult boiler manufacturerʼs
instructions for proper burner terminal connections.
McDonnell & Miller
Note: If there is no jumper installed on the low water cut-off
between 1 and P1, see ALTERNATE WIRING box.
Note: If there is no jumper installed on the low water cut-off
between H and C, see ALTERNATE WIRING box.
Note: If there is no jumper installed on the low water cut-off
between H and P1, see ALTERNATE WIRING box.
Note: If there is no jumper installed on the low water cut-off
between 1 and 3, see ALTERNATE WIRING box.
Hydrolevel
Safgard Model 450 / CycleGard CG450
STANDARD WIRING
PS-800 Series – Newer Models
STANDARD WIRING
PS-800 Series – Older Models
STANDARD WIRING
Safgard Model OEM-170TD
STANDARD WIRING
IMPORTANT
To prevent over-
feeding and possible
flooding, when used
with the OEM-170TD,
the VXT should be
set with a Feed
Delay of 10 minutes
and a Feed Amount
of 1 to 5 gallons
(see step 5).
DO NOT USE LWCO
SETTING.
Float Style Control
Using the burner circuit to power the feeder
Safgard & CycleGard Models:
If there is no jumper installed between terminals 1 and P1 on the low cut-off
(between H and P1 on Model OEM-170TD), then the cut-off is powered by a
separate power source from the burner circuit and the following wiring must
be used: ΠConnect a wire from the FEED terminal on the feeder to the A ter-
minal on the cut-off.  Connect a wire from terminal H on the feeder to the
burner circuit hot. Ž Connect a wire from terminal N on the feeder to burner
circuit neutral.
PS-800 Series:
If there is no jumper installed between terminals H and C on the low water cut-
off (terminals 1 and 3 on older models), then the cut-off is powered by a sep-
arate power source from the burner circuit and the following wiring must be
used: ΠConnect a wire from the FEED terminal on the feeder to the W (4 on
older models) terminal on the cut-off.  Connect a wire from terminal H on
the feeder to the burner circuit hot. Ž Connect a wire from terminal N on the
feeder to burner circuit neutral.
Using a separate power source for the feeder
ALTERNATE WIRING
Honeywell
Model RW-700 Guard Ring