Components And Controls; Terminal Block - Lochinvar CHP-WI-04 Installation And Service Manual

OPTIONAL EQUIPMENT
The following items are available as extra cost
options.
• Electronic low water cut-off prevents
energizing of the heater when it is not filled
with water.
• Pilot lights – Monitor on-off cycle of
contactors.
• Manual limiting switches with indicating
lights to permit heater kW input to be
manually limited as desired.
• Temperature and pressure gauges are
available installed flush with the jacket to
monitor heater performance.
• Electronic step controller modulates power
in-put and balances load to demand.
• Safety door interlock prevents opening of
access door while heater is energized.
• Shunt trip disconnect provides power
disconnect upon
malfunction.
• Alarm bell provides an audible alarm to
warn of various control failures.
• Time clock to control off-on cycles of the
heater as programmed by the owner or
electric utility requirements.
• Low water pressure switch.
• High water pressure switch.
a control sensed

COMPONENTS AND CONTROLS

POWER CIRCUIT FUSE BLOCK
IMMERSION
THERMOSTAT
LOW WATER
CUTOFF
(IF EQUIPPED)
FIG. 12 Electrical Panel Component Location
Drawing

TERMINAL BLOCK

LOAD
FIG. 13 Main Power Terminal Block
A main power terminal block is provided for field
connection of the branch power supply to the
electric water heater. All internal power circuits
to the immersion heating elements are connected
to the load side of the main terminal block. The
line side of the terminal block has individual lug
type connections properly sized for the
recommended copper field wire size.
11
TERMINAL BLOCK GROUND LUG
CONTROL
CIRCUIT
FUSE BLOCK
TRANSFORMER
CONTACTOR
CONTROL
(IF EQUIPPED)
CIRCUIT
FUSE BLOCK
LINE