Greenheck ERCH - Energy Recovery Unit with Packaged DX (468151) - Manual (Page 18)

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Energy Recovery Unit with Packaged DX
Rotation Sensor
Dirty Filter Sensor
DDC Temperature Control Package
The rotation sensor monitors energy recovery wheel rotation . If the wheel should stop rotating, the sensor will
close a set of contacts in the unit control center . Field wiring of a light (or other alarm) between terminals R & 12
in the unit control center will notify maintenance personnel when a failure has occurred (refer to Remote Panel
Wiring Schematics section for wiring details) .
Dirty filter sensors monitor pressure drop across the outdoor air filters, exhaust air filters, or both . If the
pressure drop across the filters exceeds the set point, the sensor will close a set of contacts in the unit control
center . Field wiring of a light (or other alarm) to these contacts will notify maintenance personnel when filters
need to be replaced .
The switch has not been set at the factory due to external system losses that will affect the switch . This switch
will need minor field adjustments after the unit has been installed with all ductwork complete . The dirty filter
switch is mounted in the exhaust inlet compartment next to the unit control center or in unit control center .
To adjust the switch, the unit must be running
with all of the access doors in place, except
for the compartment where the switch is
located (exhaust intake compartment) . The
adjusting screw is located on the top of the
switch . Open the filter compartment and
place a sheet of plastic or cardboard over
50% of the filter media . Replace the filter
compartment door . Check to see if there
is power at the alert signal leads (refer to
electrical diagram) . Whether there is power or
not, turn the adjustment screw on the dirty filter
gauge (clockwise if you did not have power,
counterclockwise if you did have power) until
the power comes on or just before the power
goes off . Open the filter compartment and
remove the obstructing material . Replace the door and check to make sure that you do not have power at the
alert signal leads . The unit is now ready for operation .
Temperature control package allows for stand-alone operation
of energy recovery units provided with supplemental cooling
and heating . Controller can be ordered for discharge or room
control . Room control would require a room thermostat (or
other call for heat or cool) be wired to the controller . A remote
panel option is also available to allow set points and other
controller parameters to be adjusted from a remote location .
For additional information, refer to the controls catalog and
Installation, Operation and Maintenance Manual .
OPTIONAL ACCESSORIES
Setscrew (on front of switch) must be manually
adjusted after the system is in operation .
Negative pressure connection is toward the
‘front or top’ of the switch (senses blower
side of filters)
Positive pressure connection is toward the ‘back or bottom’ of
the switch (senses air inlet side of filters)