Taco SR503-EXP User Manual

75
Wiring Taco 24VAC Electric Water Feeder to Taco LF Series 24VAC Low Water Cutoff
or 24VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs
Taco LFx024x
Taco EWF024
NC H N GND P
BURNER
CIRCUIT
HOT
NEUTRAL
HNLW
24 V AC
CIRCUIT
21P2
Hydro level
400, 500, 600, & 700
NHB
McDonnell & Miller
PS-802/852-24
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 LW COs
INSTALLED
JUMPER **
COMNO
P1A
CW
Wiring Taco 120VAC Electric Water Feeder to Taco LF Series 120VAC Low Water Cutoff
or 120VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs
NC NO H N GND P
BURNER
CIRCUIT
HOT
NEUTRAL
HNLW
120 V AC
CIRCUIT
NHWB
McDonnell & Mill er
PS-801/851-120
w/Red & Green LEDs
1 245
McDonnell & Mill er
PS-801/851-120 w/Red &
Am ber LEDs, S eries 750
21P2 A
Hydro level
450, 550, 650, & 750
Taco LFx120x
Taco EWF120
NOTE: W
iring 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 LW COs
INSTALLED
JUMPER **
COM
C
3
P1

Taco SR503-EXP Specifications

General

Brand	Taco
Model	SR503-EXP
Category	Control Unit
Language	English