Lw Co W Iring Dia Gra - UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

Low W at er Cut Off - Heat ing Only and Com bi Boilers
These guidelines are supplied when necessary t o inst all
an addit ional Low Wat er Cut Off ( LWCO) , for sensing a
low wat er level condit ion in a boiler, as required by t he
Aut hority Having Jurisdict ion.
Follow LWCO m anufact urer inst allat ion inst ruct ions for
t ype of LWCO select ed in addit ion t o t hese inst ruct ions.
LWCO shall be 120V/ 60HZ cont rol and dry cont act s sized
for load being connect ed. Wire cont rol t o boiler. See Figure
below.
Connect LWCO device t o t he syst em ground. Ground Boiler
in accordance wit h t he requirem ent s of t he aut hority
having j urisdict ion or, in t he absence of such requirem ent s,
wit h t he Nat ional Elect rical Code ( NEC) or Canadian
Elect rical Code CEC.
LW CO W I RI N G D I AGRAM
120 V/ 60 HZ
L
1
N
G
Conduit or Power
Supply cord
( Polarized)
LO W W AT ER CU T O FF
Elect rical Conduit
J- Box
BLK
WHT
GND
4 2
• Locat e LWCO sensing device in t he supply
piping, above t he m inim um height of boiler.
See Figure page 42, Piping Diagram .
• Posit ion cont rol in piping above boiler t o assure
proper boiler prot ect ion.
• For proper operat ion, sensing elem ent of t he LWCO
cont rol shall be posit ioned in t he t ee t o sense t he
main water stream. Maintain minimum 1/4" spacing
from pipe walls. Elem ent shall NOT cont act t he rear,
or side walls of t he t ee. See Figure page 43.
• I nst all an air vent using a t ee t o avoid nuisance
shut downs.
• Apply sm all am ount of pipe sealant t o t hreaded
connect ions.
• Arrange piping t o prevent wat er dripping ont o boiler.
• DO NOT inst all wat er shut off valve bet ween boiler
and LWCO sensing device.
Low Wat er Cut off ( LWCO)
L
1
N
GND
( Polarized) 120 V/ 60 HZ
Cord Set From Boiler
120 V/ 60 HZ Socket
N.O
PN 240012875 REV. D [ 03/ 15/ 2022]