Greenheck Microprocessor Controller (475595 IOM) TAP v2.10 April 2014 (RVE, ERCH-01, ERT-01) - Manual (Page 19)

T
HIS SCREEN DISPLAYS THE EXHAUST FAN SPEED SET POINTS
.
This screen only appears if equipped with an exhaust fan VFD controlled by
microprocessor.
The Speed Set Point is the proportional percentage of the analog output from the
controller to the VFD.
0% Speed = Min Speed (determined by VFD)
100% Speed = Max Speed (determined by VFD)
Possible Set Point Sources:
Local – The fan speed will be constant set from screen (exp. 100%).
BMS – The BMS can directly control the fan speed (requires BMS communication
option).
Building Pressure - Fan speed is determined by building pressure control loop.
Supply Fan Tracking – Exhaust speed proportionally tracks supply speed.
Outdoor Air Damper Tracking – The exhaust fan will proportionally track the
outdoor air damper, between a minimum and maximum position.
Normal Operation: During non-economizer operation, the exhaust fan will track
the outdoor air damper between the minimum outdoor air position (Min OA) and
the maximum sequence position (Max CO2 or Max BMS). *Note that if the OA
Damper Set Point is controlled by the BMS, the exhaust fan tracking algorithm
references an adjustable minimum position on the display. In this case, the
outdoor air damper must open above this position before the exhaust fan begins
increasing speed.
Economizer Operation: During economizer operation, the exhaust fan will track
the outdoor air damper between the minimum outdoor air position and the
maximum economizer position (Max Econ).
ExhaustFan Speed SetPt
Active: 100%
Source: Local 100%
(0%=Min Speed by VFD)
ExhaustFan Speed SetPt
Active: 0%
Source: OA Damper Trk
OA Damper
EF Speed
Min OA 0%
Max CO2 50%
Max Econ 100%
ExhaustFan Speed SetPt
Active: 0%
Source: OA Damper Trk
OA Damper
EF Speed
30% 0%
Max BMS 50%
Max Econ 100%
KƵƚĚŽŽƌĂŵƉĞƌWŽƐŝƟŽŶ
0% (MiŶ Speed) 100% (Max Speed)
džŚĂƵƐƚ&ĂŶ^ƉĞĞĚ
50%
100%
0%
Normal
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ĐŽŶŽŵŝnjĞƌ
KƉĞƌĂƟŽŶ
džŚĂƵƐƚ&ĂŶdƌĂĐŬŝŶŐŽĨKĂŵƉĞƌWŽƐŝƟŽŶ
19 DDC Controller for Tempered Air Products
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