External Optional Low Water Cut Off - ECR International COMBI 115 Installation, Operation And Maintenance Manual

6.6 External Optional Low Water Cut Off

These guidelines are supplied when necessary t o inst all an
additional Low Water Cut Off (LWCO), for sensing a low water
level condit ion in a boiler, as required by t he Aut horit y Having
Jurisdict ion.
Follow LWCO m anufact urer inst allat ion inst ruct ions for type 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 6- 4.
Connect LWCO device t o t he syst em ground. Ground 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.
• Locat e LWCO sensing device in t he supply
piping, above t he m inim um height of boiler.
See Figure 6- 3, Piping Diagram .
• Posit ion cont rol in HORI ZONTAL piping t o assure proper
boiler prot ect ion ( upright or 90° rot at 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 m ain
wat er st ream . Maint ain m inim um 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 6- 5.
• 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. Use LWCO m anufact urer suggest ed sealant .
• Arrange piping t o prevent wat er dripping ont o boiler.
• DO NOT install water shutoff valve between boiler and
LWCO sensing device.
FI GURE 6 - 4 - LW CO W iring Dia gra m
120 V/ 60 HZ
L
1
N
G
Conduit or Power
Supply cord
( Polarized)
6 - H YD RON I C PI PI N G
Elect rical Conduit
J- Box
BLK
WHT
GND
3 6
FIGURE 6-5 - Low Water Cutoff - Detail
N O
YES
L
1
N
GND
120 V/ 60 HZ Socket
Low Water Cutoff (LWCO)
N.O
( Polarized) 120 V/ 60 HZ
Cord Set From Boiler
240013687 REV A [ 09/ 01/ 2022]