MBVC Installation Manual

7
12
13
12
13
12
13
12
13
OFF
OFF
OFF
OFFON
ON
ON ON
25% 50%*
Fan Only Selection (*indicates factory setting)
75% 100%
12
13
12
13
12
13
12
13
OFF
OFF
OFF
OFFON
ON
ON ON
Fan Only Selection (*indicates factory setting)
6. The multi-speed circulator blower also offers several
custom ON/OFF ramping profiles. These profiles may
be used to enhance cooling performance and increase
comfort level. The ramping profiles are selected using
DIP switches 5 and 6. Refer to the following figure for
switch positions and their corresponding taps. Refer
to the bullet points below for a description of each
ramping profile. Verify profile selection by counting
the green CFM LED blinks and timing each step of the
ramping profile.
• Profile A provides only an OFF delay of one (1) minute
at 100% of the cooling demand airflow.
OFF
100% CFM 100% CFM
1 min
OFF
• Profile B ramps up to full cooling demand airflow by
first stepping up to 50% of the full demand for 30
seconds. The motor then ramps to 100% of the
required airflow. A one (1) minute OFF delay at 100%
of the cooling airflow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
• Profile C ramps up to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2
minutes. The motor then steps up to the full demand
airflow. Profile C also has a one (1) minute 100% OFF
delay.
100% CFM
OFF
OFF
• Profile D ramps up to 50% of the demand for 1/2
minute, then ramps to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2
minutes. The motor then steps up to the full demand
airflow. Profile D has a 1/2 minute at 50% airflow OFF
delay.
OFF
OFF
5
6
5
6
5
6
5
6
OFF OFF OFF OFFON ON ON ON
Tap A Tap B Tap C Tap D*
7. If an electric heater kit has been installed, determine
the heater kilowatt (kW) rating. Find the heater size in
the table below. Set dipswitches 9, 10, and 11 for the
installed heater as shown in the table below. The adjust
setting (already established by the cooling speed
selection) also applies to the electric heater kit airflow.
Thus, the electric heater airflow is adjusted by the same
amount. Verify selected CFM by counting the green
CFM LED blinks.
If an electric heater kit has not been installed, set dip
switches 9, 10, and 11 to any valid heater kit setting
(see airflow table for valid settings). This will prevent
an Ec Error code from being displayed.