6
operation
Main Circuit Breaker:
Operating handle for the main breaker is located behind
the outer door which is pad-lockable for lock out/tag out.
Rotating the handle to the OFF position turns power off to the panel.
Rotating the handle to the ON position provides power to the control panel.
If servicing the panel hot (door open and main breaker in energized position)
be sure to align the keyed slot on back of the operating handle with the key
on the main breaker shaft before closing the door.
Power ON Light:
A pilot light indicates the main disconnect is on and the
control panel is powered.
Pump Operation
Standard operation of the pump is by manual control only, using a two-position
selector switch located on the door. A removable “run enable” jumper is
provided so customer may take control of cycling the pump. See the control
panel wiring diagram.
Cycling the pump on and off for temperature control could cause
scaling on the coils and is not recommended.
OFF-ON Selector Switch
•
OFF position – pump motor is off.
• ON position – pump motor will run constantly unless a safety circuit
is activated.
If the water temperature in the cold-water basin drops to 35°F a N.O. contact
from the remote thermostat will close and latch-in a relay, which in turn shuts
off the circulating pump. This is a safety circuit to prevent pumping freezing
water. To reset this circuit, press the reset button on the door. The circuit can
be only reset once the cold-water basin temperature rises above 45°F.
If the basin water drops to a dangerously low level, the water level card contact
will close and also energize the latch-in relay shutting the circulating pump
off. This is a safety circuit preventing the pump from running dry. To reset this
circuit, press the reset button on the door. The circuit can only be reset if the
water in the basin has risen to an acceptable operating level.
Caution
