6
Section 3 – Operation
3.1
Initial Starting Procedure
Turn on the water supply connected to the Mokon temperature control system. (See Section
2.5 for water connections)
Turn on the electrical main disconnect switch. (See Section 2.4 for electrical connections)
If provided, turn on the electrical box door disconnect switch.
For each zone, check the motor rotation by turning on the system momentarily (press the
“Start” button then the “Stop” button). As the pump slows down, check the motor rotation.
If the motor is not rotating in the direction of the arrow label located on the motor housing
(clockwise from the lead end), reverse any two power cord leads to change the direction of
the motor rotation. (See Section 2.4)
Restart the system and set the controller to the minimum temperature. (See Section 5 for
controller instructions)
Allow the system to run for several minutes with the controller set to the minimum
temperature to remove air from the system. All systems have as standard an auto-air
purge, factory default set for 5 minutes. After 5 minutes of operation at the minimum
temperature the system should automatically purge itself of air. There is also a manual
purge button that can be used on Duratherm and Minitherm systems for Hydrotherm II
systems refer to Section 5.5 and 5.6 for additional air purge instructions.
Note: Some processes require a different air purge timed cycle other than the factory
default set value. Adjustments can be made to either lengthen or shorten this timed cycle.
Please refer to Sections 5.5 and 5.6 for additional information on the automatic air purge
feature.
Set the controller to the desired temperature. The system will reach the setpoint
temperature. (See Section 5 for controller instructions)
Note: Automatic air purge, during start-up removes air from lines (add an air-bleed and/or
air separator at highest process loop point if needed to help expel air from process).
3.2
Process Flow Adjustment
The operator must determine and set proper water flow rate for the most efficient and
trouble free operation.
o
Water flow rate through the process is determined by the pressure losses in the
process loop. Generally, higher flow rates result in turbulent flow achieving
maximum temperature control and lower maintenance.
o
If the flow rate exceeds the motor HP capacity, the electric motor will draw excessive
amps. This is a result of the process loop’s ability to flow water at a greater rate than
can be provided by the pump. This will eventually result in tripping the thermal
motor overload relay (overload relays open and the unit will shut down)
If an excessive flow situation is encountered and the motor overload circuit has tripped, the
operator must manually reset the overload relay before operations can continue. This is
done by opening the electrical panel cover, identifying the reset level of the overload relay,
and pushing the reset level “in” until the overloads are reset.
If a motor overload situation persists, the operator must adjust the flow rate to match the
system pressure loss (reduce flow rate) to prevent continual tripping of the overload relay.
