Install Instructions

••
••
•Shock hazard. Disconnect power source
before servicing. Serious injury or death
could result.
EWF Wiring
Standard Wiring – EWF to LWCO with same voltages, see
Figure 5.
1. Verify that the supply and burner circuit voltages con-
nected to the LWCO are the same as the EWF
2. Verify that factory-installed jumpers connecting the hot
lead on the LWCO to the burner source are installed.
3. Connect the hot lead wire from the power source to
terminal H on the EWF.
4. Connect the neutral lead wire from the power source to
terminal N on the EWF.
5. Connect the NO/water feeder/alarm terminal on the
LWCO to terminal LW on the EWF.
Wiring EWF to LWCO with different burner circuit voltages,
see Figure 6a & b.
1. Verify that the burner circuit voltages connected to the
LWCO are the same as the EWF
2. Verify that factory-installed jumpers connecting the hot
lead on the LWCO to the burner source are removed.
3. Connect the hot lead wire from the burner power source
to terminal H on the EWF.
4. Connect the neutral lead wire from the burner power
source to terminal N on the EWF.
5. Connect the NO/water feeder/alarm terminal on the
LWCO to terminal LW on the EWF.
NC COM NO H N
Taco LTx120x / LTx024x
GND P
BURNER
CIRCUIT
HOT
NEUTRAL
HN
Taco EWF120 / EW F024
LW
120 VAC / 24 VAC
CIRCUIT
FIG. 5
FIG. 6
(b)
(4)
(a)
NC COM NO H N
Taco LTx120x
GND P
BURNER
CIRCUIT
120 VAC
CIRCUIT
HOT
NEUTRAL
H N
Taco EW F024
LW
24 VAC
CIRCUIT
HOT
NEUTRAL
NC COM NO H N
Taco LTx024x
GND P
BURNER
CIRCUIT
120 VAC
CIRCUIT
HOT
NEUTRAL
H N
Taco EW F120
LW
24 VAC
CIRCUIT
HOT
NEUTRAL
*
*
* NOTE:
Remove factory installed
jumper between H and COM terminals
EWF Standard Wiring
EWF Alternate Wiring
FIG. 7
(a)
(b)
NC
COM
NO H N GND P
BURNER
CIRCUIT
HOT
NEUTRAL
HNLW
120 VAC
CIRCUIT
NHC WB
McDonnell & Miller
PS-801/851-120
w/Red & Green LEDs
1 23 45
McDonnell & Miller
PS-801/851-120 w/Red &
Amber LEDs, Series 750
21P1P2 A
Hydrolevel
450, 550, 650, & 750
Taco LTx120x
Taco EWF120
Installed
Jumper **
Taco LTx024x
Taco EWF024
NC
COM
NO H N GND P
BURNER
CIRCUIT
HOT
NEUTRAL
HNLW
24 VAC
CIRCUIT
21P1P2 A
Hydrolevel
400, 500, 600, & 700
NHC WB
McDonnell & Miller
PS-802/852-24
Installed
Jumper **
Wiring the EWF to Various LWCO's
Factory
Installed
Jumper
NOTE:
Wiring shown only for control
and burner circuits of the same
voltage. Some terminal designations
are not in their actual order on the
LW COs.
** May be factory installed on
some LWCOs