Specifications

Table 22 — Power Exhaust
Fan Operation Definitions
ITEM DEFINITION
BP Actual Space Pressure
BPSO Building Pressure Set Point Offset
BPSP Building Pressure Set Point
BPSR Building Pressure Submaster Reference
EF Discrete Output to Cycle Fan
ECON Economizer Position
PED Analog Damper/Inverter Output
PES Power Exhaust Set Point
PWRX Power Exhaust Type
If the supply fan is off, then exhaust fan will be turned off
and BPSR set to minimum value. The exhaust fan is then
off, the discharge damper is closed, and the control input is
set to 0.
Configuration — To configure the modulating power ex-
haust, Select Exhaust Fan Type. See Table 23.
To select the exhaust fan type, press to enter into
the Service function. Enter the password. Press to
enter into the Factory Configuration subfunction. Scroll down
to PWRX. The current configuration will be shown. Press
ENTER
to set the configuration to modulating power ex-
haust. The acceptable range of values is 0 to 2, where 0 is
no fan, 1 is non-modulating, and 2 is modulating.
To set the Building Pressure Set Point, press to
enter into the Service function. Enter the password. Press
to enter into the Building Pressure subfunction.
Scroll down to BPSP. The current pressure set point will be
shown in inches water gage. The default is 0.05 in. wg. The
acceptable range of values is 0.00 to 0.50 in. wg. To change
the set point, enter the new number (ex. ) and
ENTER
press .
To set the Building Pressure Set Point Offset, press
to enter into the Service function. Enter the
password. Press to enter into the Building Pres-
sure subfunction. Scroll down to BPSO. The current offset
set point will be shown in inches water gage. The default is
0.05 in. wg. The acceptable range of values is 0.05 to
0.50 in. wg. To change the set point, enter the new number
ENTER
(example: ) and press .
Table 23 — Configuring Modulating Power Exhaust
DESCRIPTION HOW TO CONFIGURE AT HSIO SET POINT RANGE
Select Exhaust Fan Type
FANT Modu Pow Exh = 2*
Select Building Pressure Set Point
BPSP
0.00 to 0.50 in. wg
(0.0 to 125 Pa)
Select Building Pressure Set Point Offset
BPSO
0.05 to 0.50 in. wg
(12 to 125 Pa)
*If value changed, enable Data Reset before leaving .
23