Install Instructions

Step
➌
– Wiring
Select the wiring diagram below that corresponds to the low water cut-off installed on the boiler. Consult boiler manufacturer’s
instructions for proper burner terminal connections.
McDonnell & Miller
PS-800 Series
STANDARD WIRING – NEWER MODELS
ALTERNATE WIRING: If the power source for the low
water cut-off is separate from the burner circuit (indicated by
the absence of a jumper between terminals H and C on the
low water cut-off), connect a wire from the "Feed" terminal on
the water feeder to terminal W on the low water cut-off.
Connect a wire from terminal H on the water feeder to burner
circuit hot. Connect a wire from terminal N on the water feed-
er to burner circuit common.
ALTERNATE WIRING: If the power source for the low
water cut-off is separate from the burner circuit (indicated by
the absence of a jumper between terminals 1 and 3 on the
low water cut-off), connect a wire from the "Feed" terminal on
the water feeder to terminal 4 on the low water cut-off.
Connect a wire from terminal H on the water feeder to burner
circuit hot. Connect a wire from terminal N on the water feed-
er to burner circuit common.
STANDARD WIRING – OLDER MODELS
ALTERNATE WIRING: If the power source for the low
water cut-off is separate from the burner circuit (indicated by
the absence of a jumper between terminals 1 and P1 on the
low water cut-off), connect a wire from the "Feed" terminal on
the water feeder to terminal A on the low water cut-off.
Connect a wire from terminal H on the water feeder to burner
circuit hot. Connect a wire from terminal N on the water
feeder to burner circuit common.
ALTERNATE WIRING: If the power source for the low
water cut-off is separate from the burner circuit (indicated by
the absence of a jumper between terminals 2 and P1 on the
low water cut-off), connect a wire from the "Feed" terminal on
the water feeder to terminal A on the low water cut-off.
Connect a wire from terminal H on the water feeder to burner
circuit hot. Connect a wire from terminal N on the water
feeder to burner circuit common.
Hydrolevel
Safgard Model 400 / CycleGard CG400
STANDARD WIRING
Safgard Model OEM-24TD
STANDARD WIRING
IMPORTANT
To prevent over-
feeding and possible
flooding, when used
with the OEM-24TD,
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
Honeywell
Model RW-700 Guard Ring
ALTERNATE WIRING: If you choose to wire the feeder to a
separate power source from the burner circuit, do not install
jumper between 2 and 3. Connect a wire from the "Feed" terminal
on the water feeder to terminal 4 on the low water cut-off. Connect
a wire from terminal H on the water feeder to the hot side of the
power source. Connect a second wire from terminal H to terminal
3 on the cut-off. Connect a wire from terminal N to the common
side of the power source.
ALTERNATE WIRING: If you choose to wire the feeder to a
separate power source from the burner circuit, do not install jumper
between T1 and A. Connect a wire from the "Feed" terminal on the
water feeder to terminal A on the low water cut-off. Connect a wire
from terminal H on the water feeder to the hot side of the power
source. Connect a second wire from terminal H to the other termi-
nal A on the cut-off. Connect a wire from terminal N to the common
side of the power source.
STANDARD WIRING STANDARD WIRING