Installation, Operation and Maintenance Manual
Marvel Plus
23
Subject to change without notice.
120.5-IM (1018)
BMS Economizer Interface Screen
U01 Economizer
Enable/Disable
by BMS > OFF
This screen allows building management systems to disable
economizer mode of operation when Enable/Disable by
BMS is set to ON�
Water Flush Mode Screen
U01
Water Flush Mode
Enable: Yes
Time: 22:00
Duration:
30 min
Pump On:
Yes
The setup of water flush mode allows customer to set a
water flush cycle to purge water lines within the units when
the assist with periods of unit/system inactivity�
Enable must be set to Yes for the controller to initiate the
water flush cycle. Time is the time of day for the flush cycle
to occur� Duration is the length of time in minutes for the
system to operate in flush mode. Pump ON energizes the
water pump to start the water flow as required to purge the
water lines with fresh water�
Water Valve Position Screen
U01
Water Valve
Position
DPC: 000.0%
WSE: 000.0%
Water Valve Position is used for systems with Water
Economizer Coils and Discharge Pressure Control Valves�
Setting a valve between greater than 1% will force the unit
off and open the water valves to the specified set positions.
It is designed to flush the water lines.
Duct Static Pressure Screen
U01
Static Pressure
Rate>01s Step>003%
Min>000% Max>100%
Pressure Reset > Yes
Reset Offset > 0.02iwc
The Static Pressure screen is used to adjust the VFD control
functions�
Rate
is the amount of time in seconds that the system will
compare the actual static pressure to the static pres- sure
set point before incrementing the output per the step value�
Step
is the incremented output applied� If the static pressure
must be increased or decreased it will adjust the specific
amount set into the set point at the Rate interval in seconds�
With a step value of 10% on a 0-10 vdc output, 1 vdc will be
applied to the output�
Output Min
percentage set point is used to hold at least the
percentage of output set into the minimum setting�
Output Max
is the maximum amount the control will output
that can be applied to maintain the static� If a setting less
than 100% is set into the maximum, then the controller will
only apply up to the Output Max even though the static
pressure set point may never be reached�
