Grundfos MixiMizer Installation And Operation Manual page 4

2.
General MixiMizer Features
• All minimum and maximum settings are operating,
not safety limits. Necessary auxiliary equipment
and safety devices must be added.
• The boiler return minimum temperature is fixed
at 135°F. This function can be disabled by a DIP
switch.
• The system supply maximum temperature is fixed
at 140°F. This function can be disabled by a DIP
switch.
• Heating curve parallel shift: The heating curve can
be shifted 5°F parallel to the default curve. This
function can be enabled by the DIP switch.
• Pump Exercising: After every three days of no
operation, the control will exercise the pump for 10
seconds. The % of Pump Performance LED will
be on during exercising.
• Post Purge: A 20 second post purge is available
once the heat demand is removed or control
enters WWSD. The purging holds the last speed
used.
• As variable speed output modulates, the control
flashes the % of Pump Performance LED on for ¼
second and off for ¼ to 2 1/2 seconds.
• A 2 second delay from demand to actually starting
the pump is used to prevent issues with a noisy
demand relay signal.
Optional Boiler On/Off Output: is activated
•
when the pump speed is raised to the boiler
enable percentage (30% pump speed) and is de-
activated when the pump speed falls to 50% of the
boiler enable percentage (15% pump speed). The
boiler enable relay has a minimum activation time
of 3 minutes and a minimum de-activation time of
20 seconds.
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