Substitution of components or
modification of wiring systems voids the warranty and
may lead to dangerous operating conditions.
3.
Instructions for water feed control system (i.e. motor and
pump or solenoid feed).
a.
Check the voltage of the motor or solenoid before
making electrical connection.
b.
The water feed circuit should be
wired to the junction box provided
.
c.
Motors rated greater than 1/3HP or are not 120VAC sin-
gle phase require the use of suitable motor starter.
d.
Amperage/Wire Size – For correct sizing refer to the label
on the boiler located next to the field wiring termi nals. This
label states the wire size (AWG or MCM), minimum temper-
ature rating (90˚C) and conductor material (copper only).
Deviation from this information may result in improper or
unsafe boiler operation.
Ground boiler according to National
Electric Code requirements to avoid shock. Use proper sized
wire. Power wiring to boiler should be in accordance with
Local and N.E.C. requirements following wiring diagram
supplied. Wire size specified adjacent to field wiring termi-
nal block(s). Use 90˚ C copper wire only.
Purchaser should use a disconnect switch employing circuit break-
ers or fuses between the main power source and the boiler.
Boilers are susceptible to lightning dam-
age because of plumbing water lines. Industrial type light-
ning/surge protectors should be installed according to the
manufacturer's recommendation at your service entrance.
Consult your contractor or electrical dealer.
1.
The unit is pre-wired and tested. Connect control circuit volt-
age at the control circuit terminal block.
2.
With the main power off, make sure that all wiring termina-
tions are tight to avoid arcing, carbonizing and/or overheating
of contacts.
ES 24A Electric Steam Generator
Installation, Operation and Maintenance Manual
_____________________________________________________________________________
3
Wiring
!
WARNING
!
CAUTION
!
CAUTION
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WARNING
Wiring Diagram
Control Circuit ES-24A–PRI Electric Boilers
Electrical Parts List
39243B
Heating Element 24kw 208v 3Ph
39243C
Heating Element 24kw 240v 3Ph
39243F
Heating Element 24kw 480v 3Ph
102206-1
Contactor 75 amp 3 pole 120v Coil
100412A
Liquid Level Control Board 120v
90241MRT Auxiliary LWCO Board 120v
Typical Wiring Diagram 24A
Factory Wiring
___________
Field Wiring
__ __ __ __ __
Note:
*See Boiler Nameplate for
Input requirements