Set Minimum Position 2
Use the same menu in the Unit Controller to set “Min OCP
Blwr High” for the blower CFM above the “midpoint” CFM.
When navigating into this menu, the Unit Controller will
bring on the corresponding blower speed and allow damp-
er position adjustment.
M2 - Settings / Control / Staged-Blower / Damper / High
Speed
M3 - SETTINGS > RTU OPTIONS > DAMPER > MIN
DAMPER POSITION BLOWR ON HIGH = X.X%
Measure the intake air CFM. If the CFM is lower than the
-
troller to increase the damper percent open. If the CFM is
Note - Intake air CFM can also be determined using the
outdoor air temperature, return air temperature and mixed
air temperature. Refer to the economizer or outdoor air
damper installation instructions.
E-VFD Bypass
M2 Controller
The supply air VFD is factory-set to by-pass the VFD man-
ually. To by-pass the VFD and operate the blower in the
constant air volume mode, use the following Unit Control-
ler menu and set to “engaged”:
Settings / Control / Staged-Blower / VFD Bypass
use the following Unit Controller menu and set to “auto-
matic”:
Settings / Install / New M2 / Staged-Blower VFD Bypass
Caution - Units not equipped with a VFD will be set to Set-
tings / Control / Staged-Blower VFD Bypass / None. The
blower motor could be damaged and/or result in product
or property damage if the setting is changed to automatic
or manual.
M3 Controller
The supply air inverter is factory-set to by-pass the invert-
er manually. To by-pass the inverter and operate the blow-
er in the constant air volume mode, use the following Unit
Controller menu and set to “engaged”:
SETTINGS > RTU OPTIONS > BLOWER > VFD BYPASS
use the following Unit Controller menu.
SETUP > INSTALL
Press SAVE until the menu reads:
CONFIGURATION ID 1
Change the 6th character position to A for automatic by-
pass option.
Press SAVE
Caution - Units not equipped with an inverter will have
the 6th character set to N, indicating the inverter is not by-
passed. The blower motor could be damaged and/or result
in product or property damage if the setting is changed to
automatic or manual.
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