User manual

17
motor is operating or not. The purpose of the energized space heater
is to prevent moisture inside the unit from corroding the internal
components. Failure to wire and energize the space heater will void
the warranty if the actuator fails due to internal corrosion.
Automatic Electric Actuator must be stored in a dry environment until
installed. If a unit is going to sit idle prior to startup, the actuator
must be removed from the damper and stored appropriately.
Redundant Pump Operation:
To ensure operation without fail, a redundant pump system may have been
purchased for the fluid cooler. The system does not automatically switch on the
backup pump if the primary pump fails. Manual valve adjustment is required
on all models. If continual pump operation is essential, it would be prudent
to include a circuit in the controls system notifying the operator of any pump
failure so they may change valving as quickly as possible.
MHF702 through MHF705:The redundant pump system is com-
prised of an external skid with 2 pumps and necessary piping and
valves to operate each pump. Should the primary pump fail, shut down
power to both pumps. Manually throw the necessary valves on the
pump skid and energize the secondary pump. This design allows the
primary pump to be replaced while the secondary pump is in operation.
Both pumps are identical and either may be used as the primary. It is
recommended that pumps and valves are occasionally cycled to ensure
that both pump systems remain in suitable running condition.
MHF706 and MHF707:The redundant pump system is comprised
of two pumps mounted inside the tower, with necessary piping
and valves to operate each pump. Should the primary pump fail,
shut down power to both pumps. Manually throw the necessary
valves and energize the secondary pump. This design allows the
secondary pump to run at full capacity until a time when it is accept-
able to shut down both pumps and drain the basin of water. The
primary pump can not be replaced while the basin contains water.
Both pumps are identical and either may be used as the primary. It is
recommended that pumps and valves are occasionally cycled to ensure
that both pump systems remain in suitable running condition.
Operation